JP2008014596A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe storage type water heater providing concurrent use of mist and hot water supply or hot water filling even when branching from a hot water supply piping or a hot water filling piping is carried out to connect a mist device, and preventing unexpected high temperature tapping even when hot water supply or hot water filling is used during mist use. <P>SOLUTION: In the storage type water heater, at least one of a plurality of mixing water passages has a branch, and one of the branches is connected to an apparatus using mixing water of a smaller amount in comparison with another. When using an apparatus connected to the other during use of the apparatus connected to the one, a temperature setting of a mixing valve 2B supplying hot water to a mixing water passage 5B having the branch is set at a temperature of hot water to be used in the apparatus connected to the other. Water is mixed from a position in an upstream side of the mixing valve 2B in a tapping piping 3B supplying hot water to the mixing valve 2B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water heater having a hot water storage tank such as an electric water heater or a heat pump water heater.

  In recent years, hot water storage water heaters that use midnight power to reduce running costs, such as electric water heaters and heat pump water heaters, have attracted attention. This hot water storage type water heater is required to have various functions. For example, in addition to hot water supply to general water heaters (hereinafter referred to as “general hot water”), hot water supply to hot water taps (hereinafter referred to as “bath hot water”). ”And“ hot water supply ”) and hot water filling of a bathtub (hereinafter referred to as“ pouring hot water ”). More recently, there have been known two hot water discharge paths from the hot water storage tank, and hot water and hot water are discharged at different temperature settings at the same time.

  FIG. 1 is an example of such a hot water storage type water heater. Hot water heated by heating means such as a heat pump is filled in the hot water storage tank 1. The hot water storage tank 1 is filled by controlling the plurality of mixing valves 2 based on the temperature data set by the temperature setting means 10 and the signal from the temperature sensor provided on the return hot water side from the heating means. The hot water and water from the water supply pipe 4 are mixed so that the hot water temperature after the mixing operation can be supplied at different hot water temperatures (Patent Document 1).

  However, if a malfunction occurs in the mixing valve itself, it is conceivable that unexpectedly hot water will come out of the hot water tap. Therefore, in order to prevent unexpectedly hot water from coming out, even when a malfunction occurs in one mixing valve, a countermeasure for controlling the temperature of the hot water using the other mixing valve is considered (Patent Literature). 2).

In recent years, there has been a demand for an additional mist function for hot water storage hot water heaters, and branching off existing hot water supply pipes and pouring pipes from the standpoint of ease of installation and cost to existing hot water storage hot water heaters. Thus, there has been considered a hot water supply device in which a mist device is connected so that the mist and hot water supply or pouring have a common mixing valve for adjusting the hot water temperature (Patent Document 3). Here, since the mist device generally sprays fine hot water particles having a particle size of several microns to several hundred microns, the flow rate of hot water used is usually as low as several tens of milliliters to 1 liter per minute. Flow rate. On the other hand, the flow rate of hot water used for hot water supply or pouring is 10 liters to 20 liters per minute, about 10 times or more larger than the flow rate in mist.
JP 2004-150796 A Japanese Patent Application No. 2005-305853 Japanese Patent Application No. 2005-305854

  However, when the mist device is branched from the hot water supply pipe or the pouring pipe and connected to the mist device as described above, the mist and the hot water supply or the pouring hot water share a mixing valve for adjusting the hot water temperature. Even when it is desired to use hot water or pouring while using mist, it has been necessary to wait for use of hot water or pouring until the mist is stopped after the mist is stopped or until the mist is used.

  In the present invention, when the mist is branched from the hot water supply pipe or the pouring pipe and the mist device is connected, the temperature of the hot water used for the mist (about 40 ° C. to 60 ° C.) It is an object of the present invention to provide a hot water storage type hot water supply in which mist and hot water supply or pouring can be used simultaneously by setting the temperature to the same temperature as that of hot water used for hot water supply or pouring (about 40 ° C.). I am trying.

  As a result, the temperature of the mist hot water may decrease, but the hot water particles sprayed as mist are small, from several microns to several hundred microns, and are usually used simultaneously with a bathroom dryer. The temperature in the bathroom does not change rapidly, and the mist user does not feel uncomfortable.

  If a mist device is connected by branching from a hot water supply pipe or a hot water supply pipe, the flow rate of hot water flowing through the hot water supply pipe or the hot water supply pipe will change drastically when the use of hot water supply or hot water supply is started while using the mist. To do. For this reason, the control of the mixing of hot water with the mixing valve of the hot water supply pipe or the pouring pipe may be unstable. If the hot water temperature after the mixing operation becomes high due to the destabilization of the control, there is a possibility that the user feels hot because the flow rate is relatively high in hot water supply or pouring. For this reason, there is a demand for further safety.

  Therefore, the present invention relates to a hot water storage hot water supply apparatus that can branch from a hot water supply pipe or a hot water supply pipe and connect a mist device to discharge the mist and hot water or hot water at the same time. Another object is to provide a hot water storage type hot water heater that suppresses unexpected high-temperature hot water supply even when used.

(1) The present invention relates to a hot water storage tank for storing hot water heated by heating means, a plurality of mixing valves for mixing hot water and water, and a hot water piping for branching and supplying the hot water in the hot water storage tank to the plurality of mixing valves. A hot-water storage water heater comprising: a water supply pipe that branches into the plurality of mixing valves to supply water; and a plurality of mixed water passages that supply mixed water from each of the plurality of mixing valves. At least one of the water passages has a branch, and one of the branches is connected to an appliance that uses mixed water at a higher temperature than the other, and the appliance connected to the one is connected to the other during use. When using an appliance, the temperature setting of the mixing valve (2B) for supplying hot water to the mixed water channel (5B) having the branch is set as the temperature setting of the hot water used by the appliance connected to the other hot water storage hot water supply Machine.
(2) In (1), the appliance that uses the mixed water at a higher temperature than the appliance connected to one of the branches of the mixed water passage (5B) and connected to the other is compared to the appliance connected to the other. This is a hot water storage water heater that is a device that uses mixed water at a low flow rate.
(3) In (1) or (2), when using a device that is connected to one of the branches of the mixed water passage (5B) and uses a small amount of mixed water compared to the device connected to the other, This is a hot water storage type hot water supply device in which water is mixed into a hot water supply pipe (3B) for supplying hot water to the mixing valve (2B) from a position upstream of the mixing valve (2B).
(4) In any one of (1) to (3), at least one of the mixed water passages not having a branch is provided with an electric valve having a water stop function, connected to one of the branches, and mixed compared to the other When using a device that uses water at a low flow rate, the motor-operated valve is closed, and the mixing valve (2A) that supplies hot water to the mixing water channel (5A) provided with the motor-operated valve is controlled. Thus, a hot water storage type hot water supply apparatus in which hot water obtained by mixing hot water in a hot water storage tank and water in a water supply pipe is supplied to the hot water supply pipe (3B).
(5) In (4), a temperature sensor for detecting the temperature of the water in the water supply pipe and the temperature of the hot water in the hot water storage tank are provided, and the hot water supplied to the hot water supply pipe (3B) is supplied from the two temperature sensors. It is a hot water storage type water heater controlled based on a signal.
(6) In any one of (1) to (5), a hot water storage type hot water supply apparatus using a heat pump as a heating means for heating hot water stored in a hot water storage tank.

  According to the present invention, it is possible to provide a hot water storage type water heater capable of simultaneously using mist and hot water supply or pouring even when a mist device is connected by branching from a hot water supply pipe or a pouring pipe. . Moreover, even when hot water supply or pouring is used at the time of mist use, this invention can suppress the unexpected high temperature hot-water supply, and can provide a safe hot water storage type hot water heater.

  First, the configuration of the hot water storage type water heater of the present invention will be described with reference to FIG. 2 as an example.

  The hot water storage type water heater illustrated in FIG. 2 includes a hot water storage tank 1, mixing valves 2 </ b> A, 2 </ b> B, hot water piping 3, 3 </ b> A, 3 </ b> B, a branch 15, a water supply pipe 4, a mixed water passage 5 </ b> A, 5B, a branch 9, The temperature sensor 7A, 7B, 7C, 7D, 7E, the heating means 8, the mist device 13, etc. are comprised.

  The heating means 8 used in the present invention is not particularly limited as long as it can heat hot water and store hot water in the hot water storage tank, and a heat pump, an electric heater, or the like can be used. In the case of the heat pump, the hot water storage tank 1 is provided outside the hot water storage tank 1, and a water circulation tank is formed between the hot water storage tank 1 and the heat pump. Can be stored in hot water. Further, in the case of an electric heater, it may be installed outside the hot water storage tank to constitute a circulating water channel in the same manner as the heat pump, but it is installed in the hot water storage tank 1 so as to directly heat the water in the hot water storage tank 1. However, the hot water can be stored in the hot water storage tank 1. In addition, when using a heat pump, since the refrigerant | coolant used with a heat pump can store high temperature hot water, carbon dioxide gas is desirable.

  The hot water storage tank 1 stores hot water heated by the heating means 8 and has a structure in which piping such as a hot water supply pipe 3 for discharging the stored hot water and a water supply pipe 4 for supplying water to the hot water storage tank 1 can be connected. Have The connection between the hot water storage tank 1 and the hot water supply pipe 3 is preferably provided in the upper part of the hot water storage tank 1. In the hot water storage tank 1, hot hot water is stored upward and low temperature hot water is stored downward, so that hot hot water in the hot water storage tank 1 can be used.

  The tapping pipe 3 is a pipe for tapping hot water in the hot water storage tank 1, and is provided with a branch 15 for supplying hot water according to functions such as hot water supply and pouring, and branches to the tapping pipes 3A and 3B. . Hot water discharged from the hot water storage tank 1 passes through the hot water supply pipes 3, 3A, 3B, and is used after being adjusted to a desired temperature by the mixing valves 2A, 2B. In addition, the water of the water supply piping 4 can be supplied to the hot water supply piping 3A by controlling the mixing valve 2A. In this case, in the branch 15, the hot water from the tapping pipe 3 and the water from the mixing valve 2 </ b> A are mixed, and this mixed water is supplied to the tapping pipe 3 </ b> B.

  The temperature sensors 7A and 7B are provided in the mixed water passages 5A and 5B after mixing with hot water and water. The temperature sensors 7A and 7B control the temperature of the mixed water in the mixing valves 2A and 2B in the mixing water channels 5A and 5B.

  The temperature sensor 7D is provided in the hot water storage tank 1 and measures the temperature of the hot water stored. When hot water is taken out from the upper part of the hot water storage tank 1, it is desirable to install a temperature sensor at the upper part of the hot water storage tank 1. Thereby, the temperature of the hot water discharged from the hot water storage tank 1 can be measured more accurately. The temperature sensor 7E is provided in the water supply pipe 4 and measures the temperature of the supplied water. When the water from the water supply pipe 4 is supplied to the hot water discharge pipe 3A by controlling the mixing valve 2A, signals from the temperature sensor 7D provided in the hot water storage tank 1 and the temperature sensor 7E provided in the water supply pipe 4 Thus, the mixing ratio of the hot water from the hot water supply pipe 3 and the water from the water supply pipe 4 in the mixing valve 2A is controlled.

  It is preferable that the temperature sensor 7C is provided in the hot water supply pipe 3B. Thus, when water from the water supply pipe 4 is supplied to the hot water supply pipe 3A by controlling the mixing valve 2A, water from the hot water supply pipe 3A (in this case, functions as a water supply pipe), and hot water The temperature of the mixed water with the hot water from the pipe 3 can be accurately measured.

  The mixing valves 2A and 2B adjust hot water from the hot water supply pipe 3 and water from the water supply pipe 4 to an arbitrary temperature and mix them. Any of the signals from the temperature sensors 7A, 7B, 7C, 7D, and 7E, or any one that can adjust the mixing ratio based on some of these signals may be used. The mixing valves 2A and 2B are provided in the branched hot water supply pipes 3A and 3B, respectively.

  The water supply pipe 4 is a pipe for supplying water such as tap water from the outside of the hot water storage type water heater, and supplies water to the plurality of mixing valves 2A and 2B.

  The mixed water passages 5A and 5B are pipes for discharging mixed water mixed by the mixing valves 2A and 2B, and include temperature sensors 7A and 7B for measuring the temperature of each mixed water. By providing the temperature sensors 7A and 7B, the temperature of the mixed water can be measured and the mixing valves 2A and 2B can be controlled. In the case of FIG. 2, the mixed water passage 5 </ b> A is a pouring pipe that supplies hot water for hot water filling to the bathtub 17, and the mixed water channel 5 </ b> B is a hot water supply pipe that supplies hot water to general hot water or bath hot water.

  As shown in FIG. 2, when the mixed water passage 5A is a pouring pipe and the mixed water passage 5B is a hot water supply pipe, the branch 9 may be provided in the mixed water passage 5B or the mixed water passage 5A. In any case, since a general hot water storage type hot water heater is an existing pipe, a branch 9 is provided in these pipes and a mist device 13 is connected to make the function of mist using the existing pipe. It becomes possible to add.

  One of the branches 9 is connected to an instrument that uses mixed water at a lower flow rate than the other 12. This instrument is not particularly limited as long as it uses mixed water at a lower flow rate than the other 12. As such an instrument, for example, a mist device having a flow rate of hot water used of several tens of milliliters to one liter per minute as shown in FIG.

  The other 12 of the branch 9 is connected to a device that uses the mixed water at a higher flow rate than the other 11 of the branch 9. This instrument is not particularly limited as long as it uses mixed water at a higher flow rate than the one 11. For example, as shown in FIG. 2, it is desirable to connect a hot water tap with a hot water flow rate of about 10 liters to 20 liters per minute.

  The motor-operated valve 6 needs to have a function of stopping the supply of mixed water (hereinafter referred to as “closing function”). For example, when the temperature sensors 7A and 7B in the mixed water passages 5A and 5B detect an abnormality in the temperature of the mixed water, the supply of the mixed water is stopped. As shown in FIG. 2, the motor-operated valve 6 needs to be provided at least in any one of the mixed water passages to which an appliance using a small flow rate of hot water such as a mist device 13 is not connected.

  Next, the operation of the hot water storage type water heater of the present invention will be described with reference to the hot water storage type water heater of FIG.

  When using the hot water supply alone, the hot water from the hot water supply pipe 3 and the water from the water supply pipe 4 are mixed by controlling the mixing valve 2B based on the signal from the temperature sensor 7B provided in the mixed water passage 5B. The mixed water at a desired temperature is discharged. When pouring hot water is used alone, the hot water from the tap water pipe 3 and the water from the water supply pipe 4 are mixed by controlling the mixing valve 2A based on the signal from the temperature sensor 7A provided in the mixed water passage 5A. Then, mixed water having a desired temperature is discharged. In addition, since it has two mixing valves 2A and 2B and each is controlled by temperature sensors 7A and 7B, both hot water supply and pouring can be discharged at any different temperature.

  When a mist, which is one of the instruments that use mixed water at a low flow rate, is used alone, a hot water supply pipe 3B that supplies hot water to the mixing valve 2B at the entrance of the mixed water channel 5B before branching to one 11 and the other 12 is used. In addition, water is mixed from a position upstream of the mixing valve 2B. And the temperature of the hot water used with mist is adjusted in two steps as follows.

  In the branch 15, the first stage hot water temperature is adjusted by mixing hot water from the hot water discharge pipe 3 and water from the mixing valve 2 </ b> A. The mixing ratio of hot water by the mixing valve 2 </ b> A here is controlled based on signals from a temperature sensor 7 </ b> D provided in the upper part of the hot water storage tank 1 and a temperature sensor 7 </ b> E provided in the water supply pipe 4. That is, the mixing ratio is calculated from the temperature of hot water in the hot water storage tank 1 before mixing and the temperature of water in the water supply pipe 4.

  The adjustment of the hot water temperature in the second stage is performed by mixing the mixed water mixed in the branch 15 and the water from the water supply pipe 4 in the mixing valve 2B. Here, the mixing ratio of hot and cold water by the mixing valve 2B is a mixing ratio adjusted to the final use temperature by the control of the mixing valve 2B based on the signal from the temperature sensor 7B.

  The hot water temperature adjustment in the first stage needs to be higher than the set temperature of the hot water temperature preparation in the second stage, that is, the use temperature in the mist, and is preferably about 10 ° C. higher than the use temperature in the mist. . Specifically, since the operating temperature in the mist is usually about 60 ° C., it is desirable to set it to about 70 ° C. Regardless of the operating temperature of the mist, when the temperature is fixed at about 70 ° C., the control becomes easy, and as will be described later, even if the control with the mixing valve 2B becomes unstable, the hot water storage tank 1 It is more desirable because the hot water from is not discharged as it is.

  In this way, by adjusting the hot water temperature in two stages, the hot water from the hot water storage tank 1 is adjusted to a temperature close to the operating temperature to some extent before it is adjusted to the final operating temperature. As a result, even if the mixing valve 2A that adjusts the hot water temperature to the final operating temperature is defective, the hot water from the hot water storage tank 1 can be prevented from being sprayed as a mist at a high temperature. . In addition, as described later, when the use of hot water is started at the time of using mist, the control of the mixing valve 2B becomes unstable, and there is a possibility that hot water is supplied to the hot water supply side. Even in such a case, it is possible to suppress high temperature hot water supply to the hot water supply side.

  When the use of hot water is started during the use of mist, the mist and the hot water cannot be used at different hot water temperatures because the mixing valve 2B and the mixed water passage 5B are shared. When the hot water supply is set to about 60 ° C., which is the same as the operating temperature of the mist, there is a problem that hot water is supplied as hot water. On the other hand, the particle size of the mist is as small as several microns to several hundred microns and is usually used at the same time as the bathroom dryer. Therefore, even if the setting of about 60 ° C is changed to about 40 ° C, the temperature in the bathroom is It does not change abruptly and the mist user does not feel uncomfortable. For this reason, when using the hot water tap connected to the other 12 while using the mist connected to one 11 of the branch 9, the temperature setting of the hot water by the mixing valve 2B at the entrance of the mixing water channel 5B before branching Is the temperature setting of the hot water used in the hot water tap connected to the other 12. That is, the temperature of the hot water supplied to the mist is adjusted to about 40 ° C., which is the operating temperature of the hot water supply. Thereby, simultaneous use of mist and hot water supply is enabled.

  Here, the flow rate of hot water used in the mist is from several milliliters per minute to about 1 liter per minute, whereas the flow rate of hot water used in hot water supply is from about 10 liters per minute to 20 liters per minute. When the use of hot water is started or stopped when using mist, the amount of hot water or water supplied to the mixing valve 2B changes abruptly. In addition, when the mist is used at 60 ° C., the temperature of the mixed water adjusted by the mixing valve 2B also changes rapidly to about 40 ° C., which is the temperature of the hot water used for hot water supply, after the start of hot water supply. For this reason, there is a possibility that the control of the mixing valve 2B becomes unstable and high temperature hot water is supplied to the hot water supply side. In such a case, the mixed water is adjusted by the first stage hot water temperature adjustment. Since the temperature of the hot water is lowered to 70 ° C. or lower, it is possible to suppress high-temperature hot water supply to the hot water supply side as compared with the case where the first-stage hot water temperature adjustment is not performed.

  Thus, when using the mist, the mixing valve 2B is used for adjusting the hot water temperature in the first stage, and the hot water piping 3A is used for supplying water to the branch 15. For this reason, pouring cannot be used. However, since mist is usually used after hot water filling using pouring is finished, it does not deteriorate usability.

  Further, when using mist, the motor-operated valve 6 provided in the mixed water passage 5A is closed. Thus, by stopping the supply of the mixed water to the pouring, the mixing valve 2A and the outlet pipe 3A can be used for the first stage hot water temperature adjustment when the mist is used. Further, by controlling the mixing valve 2A at the entrance of the mixing water channel 5A provided with the electric valve 6, hot water mixed with the hot water in the hot water storage tank 1 and the water in the water supply pipe 4 is supplied to the mixing water channel 5B having the branch 9. Is done.

  That is, when the electric valve 6 of the mixed water passage 5A is closed and the use of the pouring water is stopped, the mixing valve 2A and the tapping pipe 3A can be used for the preparation of hot water supplied to the hot water supply. By controlling the valve 2A, the water from the water supply pipe 4 is supplied to the branch 15 of the hot water supply pipes 3A and 3B. Thereby, the hot water of the tap water piping 3 and the water of the feed water piping 4 are mixed in the position upstream from the mixing valve 2B at the entrance of the mixed water passage 5B. As a result, hot water obtained by mixing hot water in the hot water storage tank 1 and water can be supplied to the mixed water passage 5B on the hot water supply side, and general hot water supply is used during hot water supply at a small flow rate when using mist. However, it is possible to prevent high-temperature hot water due to the unstable operation of the mixing valve 2B.

  Embodiments of a hot water storage type water heater according to the present invention will be described below with reference to the drawings.

  FIG. 2 shows an embodiment of the present invention. The hot water storage type water heater of the embodiment of FIG. 2 includes a hot water storage tank 1, mixing valves 2A and 2B, hot water piping 3, 3A and 3B, branch 15, water supply piping 4, mixed water passages 5A and 5B, motorized valve 6, and temperature sensor. 7A, 7B, 7C, 7D, 7E, heating means 8, branch 9, mist device 13, mist nozzle 14, hot water tap 16, bathtub 17 and the like.

  As the heating means 8, a heat pump using carbon dioxide as a refrigerant was used. The connection between the hot water storage tank 1 and the heating means 8 constitutes a circulation channel for supplying water taken from the lower part of the hot water storage tank 1 with the heat pump and then supplying it from the upper part of the hot water storage tank 1. The hot water storage tank 1 has a structure in which water can be taken in from the lower part and a hot water discharge pipe 3 for discharging the stored hot water can be connected to the upper part.

  One mixing valve 2 </ b> A and 2 </ b> B was provided in each of the mixed water passage 5 </ b> A that is connected to fill the hot water in the bathtub 17 and the mixed water passage 5 </ b> B that is connected to supply hot water to the hot water tap 16. The water supply pipe 4 was branched and connected so as to supply water to the hot water storage tank 1, the mixing valve 2A, and the mixing valve 2B. The water supply pipe 4 is provided with a temperature sensor 7E so that the temperature of the supplied water can be detected.

  The hot water supply pipes 3A and 3B for supplying hot water from the hot water storage tank 1 to the mixing valves 2A and 2B are branched from the hot water supply pipe 3 and connected to the mixing valves 2A and 2B. A temperature sensor 7C is provided in the tapping pipe 3B so that the temperature of the mixed water passing through the branch 15 can be detected. In addition, a temperature sensor 7D is provided at the upper part of the hot water storage tank 1 so that the temperature of the hot water supplied from the hot water storage tank 1 can be detected.

  Temperature sensors 7A and 7B are provided in the mixed water passages 5A and 5B after the mixing of the hot water with the mixing valves 2A and 2B, respectively, and the temperature of the mixed water flowing through the mixed water passages 5A and 5B is detected. The mixing valves 2A and 2B can be controlled based on signals from the sensors 7A and 7B. In addition, an electric valve 6 capable of opening and closing the mixed water passage 5A is provided in the mixed water passage 5A connected to the pouring.

  The mixed water passage 5B connected to the hot water supply is provided with a branch 9. The mist device 13 is connected to one 11 and the hot water tap 16 is connected to the other 12.

  Next, the operation in the above configuration will be described.

  First, the operation when using hot water or pouring will be described. When hot water is supplied, the hot water stored in the hot water storage tank 1 and the water supplied from the water supply pipe 4 are controlled by the mixing valve 2B based on the signal from the temperature sensor 7B provided in the mixed water passage 5B. The mixed water whose temperature is controlled arbitrarily is discharged. When pouring hot water, the hot water stored in the hot water storage tank 1 and the water supplied from the water supply pipe 4 are controlled by controlling the mixing valve 2A based on the signal from the temperature sensor 7A provided in the mixed water passage 5A. Unpoured water, optionally temperature-controlled. In this embodiment, since the two mixing valves 2A and 2B are provided and each is controlled by the temperature sensors 7A and 7B, it is possible to discharge hot water at any different temperature.

  Next, the operation | movement at the time of using the instrument which uses mixed water by a small flow volume is demonstrated. In the present embodiment, a mist device 13 having a hot water flow rate of about 1 liter per minute is used as an instrument that uses mixed water at a low flow rate. When this mist device 13 is used, the motor-operated valve 6 provided in the mixed water passage 5A connected to the bathtub 17 is closed, and the bath hot water filling operation is stopped.

  Then, as a first stage hot water temperature adjustment, the mixed water of the high temperature hot water from the hot water storage tank 1 and the water from the water supply pipe 4 supplied into the hot water supply pipe 3A via the mixing valve 2A is about 70 ° C. Thus, the mixing valve 2A is controlled. This control is performed by mixing at a mixing ratio calculated from the signal of the temperature sensor 7D provided in the upper part of the hot water storage tank 1 and the signal of the temperature sensor 7E provided in the water supply pipe 4. In this way, the mixed water adjusted to 70 ° C. is supplied to the mixing valve 2B through the hot water piping 3B.

  The mixed water that has reached the mixing valve 2B is finally adjusted to the temperature of the hot water used in the mist device 13 in the mixing valve 2B as a second stage hot water temperature adjustment. This adjustment is performed by controlling the mixing valve 2B based on a signal from a temperature sensor 7B provided in the mixing water channel 5B.

  The mixed water whose second hot water temperature is adjusted by the mixing valve 2 </ b> B is supplied to the mist device 13 connected to one of the branches 9 through the branch 9 and sprayed from the mist nozzle 14.

  The operation when simultaneously using hot water while using the mist device 13 will be described. Since the mist and hot water share the mixing valve 2B and the mixed water passage 5B and cannot be used at different hot water temperatures, the temperature of the hot water supplied to the mist is adjusted to about 40 ° C., which is the operating temperature of the hot water. . Thereby, simultaneous use of mist and hot water supply is enabled.

  Here, in this embodiment, the flow rate of hot water used in the mist device 13 is about 1 liter per minute, whereas the flow rate of hot water used in hot water supply is 15 liters per minute. Sometimes, when the use of hot water is started, the amount of hot water or water supplied to the mixing valve 2B changes abruptly. In the present embodiment, the temperature of the mixed water adjusted by the mixing valve 2B is 60 ° C. when using mist, and rapidly changes to 40 ° C., which is the temperature of hot water used for hot water supply, after the start of hot water supply. For this reason, there is a possibility that the control of the mixing valve 2B becomes unstable and high temperature hot water is supplied to the hot water supply side. In such a case, the mixed water is adjusted by the first stage hot water temperature adjustment. Since the temperature of the hot water is lowered to 70 ° C. or lower, it is possible to suppress high-temperature hot water supply to the hot water supply side as compared with the case where the first-stage hot water temperature adjustment is not performed.

It is a block diagram of the hot water storage type water heater which shows a prior art example. It is a block diagram of the Example of the hot water storage type water heater based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank 2, 2A, 2B ... Mixing valve 3, 3A, 3B ... Outlet piping 4 ... Feed water piping 5A, 5B ... Mixed water passage 6 ... Electric valve 7A, 7B, 7C, 7D, 7E ... Temperature sensor 8 ... Heating Means 9 ... Branch 10 ... Temperature setting means 11 ... One 12 ... The other 13 ... Mist device 14 ... Mist nozzle 15 ... Branch 16 ... Hot water tap 17 ... Bathtub

Claims (6)

A hot water storage tank for storing hot water heated by heating means,
A plurality of mixing valves for mixing hot water and water;
A hot water supply pipe for branching and supplying hot water from the hot water storage tank to the plurality of mixing valves;
A water supply pipe for supplying water by branching to the plurality of mixing valves;
In the hot water storage type hot water heater provided with a plurality of mixed water passages for supplying mixed water from each of the plurality of mixing valves,
At least one of these mixed water passages has a branch, and one of the branches is connected to an appliance that uses the mixed water at a higher temperature than the other,
When using the appliance connected to the other while using the appliance connected to the one, the temperature setting of the mixing valve (2B) for supplying hot water to the mixing water channel (5B) having the branch, A hot water storage type water heater that sets the temperature of the hot water used in the appliance connected to the other side. In claim 1,
A device that uses mixed water at a higher temperature than the device connected to one of the branches of the mixed water passage (5B) and connected to the other uses mixed water at a lower flow rate than the device connected to the other. Hot water storage water heater that is an appliance to be used. In claim 1 or claim 2,
Hot water supply pipe for supplying hot water to the mixing valve (2B) when using a device that is connected to one of the branches of the mixed water passage (5B) and uses a small amount of mixed water compared to the device connected to the other (3B) A hot water storage type hot water heater in which water is mixed from a position upstream of the mixing valve (2B). In any one of Claims 1-3,
At least one of the mixed water passages not having a branch includes an electric valve having a water stop function,
When using a device that is connected to one of the branches and uses a small amount of mixed water compared to the other,
The motorized valve is closed,
By controlling the mixing valve (2A) that was supplying hot water to the mixing channel (5A) equipped with the electric valve,
A hot water storage type water heater in which hot water obtained by mixing hot water in a hot water storage tank and water in a water supply pipe is supplied to the hot water supply pipe (3B). In claim 4,
Each has a temperature sensor that detects the temperature of the water in the water supply piping and the temperature of the hot water in the hot water storage tank,
A hot water storage type hot water supply apparatus in which hot water supplied to the hot water supply pipe (3B) is controlled based on signals from the two temperature sensors. In any one of Claims 1-5,
A hot water storage type water heater that uses a heat pump as a heating means to warm the hot water stored in the hot water storage tank.

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