JP2009222268A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage water heater of a simple constitution free from water hammering phenomenon. <P>SOLUTION: This storage water heater includes: a hot water storage tank 1 for storing hot water; a first water supply pipe 4 for supplying the water to a lower section of the hot water storage tank 1; a bath hot water supply pipe 30 for supplying the hot water of the upper section of the hot water storage tank 1 to a bathtub; a second water supply pipe 6 branched from the first water supply pipe 4; and a bath mixing means 5 connecting the bath hot water supply pipe 30 and the second water supply pipe 6 to produce hot water of a proper temperature. The bath mixing means 5 is provided with a closing function, so that the mixing means is driven from a closed state, and the water is gradually increased to be heated, thus the water hammering in starting hot water supply can be prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water heater having an automatic bath pouring function.

  Currently, a hot water storage type water heater uses a solenoid valve for pouring a bath, and hot water is supplied to the bath by opening the solenoid valve. However, there are many voices from the market that want more powerful hot water supply. To meet this need, it is conceivable to use a direct pressure type or increase the set pressure of the pressure reducing valve. However, if the pressure is increased, there is a demerit that water hammer phenomenon tends to occur.

  On the other hand, in a conventional bath water heater, a hot water supply amount control valve is provided in the water passage of the hot water heater, a hot water supply amount control valve is provided in front of the solenoid valve, and the flow rate of hot water is reduced by the hot water supply amount control valve. The electromagnetic valve is configured to be fully closed (see, for example, Patent Document 1).

FIG. 4 shows a conventional bath water heater. In FIG. 3, water is supplied from the water supply pipe 102, hot water is obtained by the heat exchanger 101, and hot water supply to the bath can be opened and closed by the solenoid valve 112 via the hot water supply amount control valve 107. The water hammer can be prevented by restricting the flow rate with the hot water supply flow rate control valve 107 before being fully closed.
JP-A-2-52947

  However, in the conventional configuration, the flow rate of pouring into the bath is increased or decreased while adjusting the flow rate of the hot water supplied to the bath by using the hot water supply amount control valve. It had the problem of end.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a hot water storage type hot water heater having a simple configuration in which a water hammer phenomenon does not occur.

  In order to solve the conventional problems, a hot water storage type water heater of the present invention includes a hot water storage tank for storing hot water, a first water supply pipe for supplying water to a lower portion of the hot water storage tank, and hot water at an upper portion of the hot water storage tank. A bath hot water supply pipe to be supplied to the bathtub, a second water supply pipe branched from the first water supply pipe, a bath mixing means for connecting the bath hot water supply pipe and the second water supply pipe to generate hot water at an appropriate temperature, By providing the bath mixing means with a closing function, the mixing means is driven from the closed state so that the water gradually increases and then becomes hot water. Can be prevented.

  INDUSTRIAL APPLICABILITY The present invention can provide a hot water storage type water heater having a simple configuration in which the water hammer phenomenon does not occur.

A hot water storage type water heater of the first invention includes a hot water storage tank for storing hot water, a first water supply pipe for supplying water to the lower part of the hot water storage tank, and a bath hot water supply pipe for supplying hot water at the upper part of the hot water storage tank to the bathtub. , A second water supply pipe branched from the first water supply pipe, and a bath mixing means for connecting the bath hot water pipe and the second water supply pipe to generate hot water of an appropriate temperature, the bath mixing means having a closing function By having it, the mixing means is driven from the closed state so that the water is gradually increased after the water gradually increases, and a water hammer at the start of pouring can be prevented.

  The hot water storage type water heater of the second aspect of the invention, particularly in the first aspect of the invention, is provided with a backup power source capable of driving at least the bath mixing means, so that it is possible to reliably prevent the pouring of water even in the event of a power failure. High temperature outflow in the hot water storage tank can be prevented.

  The hot water storage type water heater of the third invention is provided with an electromagnetic valve for starting and stopping the circulation of hot water between the bath mixing means and the bathtub, particularly in the first or second invention, When stopping the pouring hot water, after stopping the circulation of hot water by driving the bath mixing means, even if either component of the electromagnetic valve or the bath mixing means breaks down by closing the solenoid valve, The pouring can be stopped with the other component, and further, the bath mixing means is driven and closed before closing the solenoid valve, so that it is possible to prevent water hammer when pouring is stopped.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a hot water storage type water heater in the first embodiment. Solid line arrows indicate the direction of hot water. In FIG. 1, hot water heated by a heat pump or an electric heater is stored in a hot water storage tank 1. In this embodiment, heating is performed by the heat pump 2 and hot water is stored in the hot water storage tank 1. However, the present invention is not limited to this embodiment, and hot water in the hot water storage tank 1 is heated by an electric heater or the like. Also good.

  In the present embodiment, the heat pump 2 is configured by sequentially connecting a water-refrigerant heat exchanger 11, a compressor 12, an evaporator 13, and an expansion valve 14 in an annular manner through a refrigerant pipe, and uses carbon dioxide as the refrigerant. Since the high pressure side exceeds the critical pressure, the water flowing through the water / refrigerant heat exchanger 11 loses heat and does not condense even if the temperature is lowered. It is easy to form a temperature difference between them and high temperature hot water can be obtained, and the heat exchange efficiency can be increased. In addition, since relatively inexpensive and stable carbon dioxide is used for the refrigerant, the product cost can be reduced and the reliability can be improved. In addition, carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, which is very small.

  Further, in the heat pump 2, the refrigerant is compressed by the compressor 12, the refrigerant discharged from the compressor 12 radiates heat by the water refrigerant heat exchanger 11, is decompressed by the expansion valve 14, and then is heated from the air by the evaporator 13. And is sucked into the compressor 12 again in a gas state. The compressor capacity control and the expansion valve 14 opening control are performed so that the temperature of the discharged refrigerant detected by a thermistor (not shown) provided on the discharge side of the compressor 12 is maintained at a preset temperature. Controlled. The hot water in the hot water storage tank 1 flows into the water / refrigerant heat exchanger 11 when the water pump 15 is operated, exchanges heat with the refrigerant, returns to the hot water storage tank 1 again, and in the stacked state, Hot water is stored at the top.

On the other hand, along with the hot water supply to the hot water supply terminal, hot water is discharged from the hot water discharge pipe 3 disposed in the upper part of the hot water storage tank 1, and the water from the second water supply pipe 6 branched from the first water supply pipe 4 Hot water from the hot water outlet 3 is mixed at an appropriate temperature by the electric mixing valve 8 and supplied to the hot water supply terminal 9. Furthermore, with hot water to the bathtub 7, hot water from the bath hot water pipe 30 branched from the hot water pipe 3 and water from the second water supply pipe 6 are mixed at an appropriate temperature by the electric mixing valve 5 having a closing function. , Supplied to the bathtub 7.

  Here, the configuration of the electric mixing valve with a closing function will be described. FIGS. 2A and 2B are views showing the configuration of an electric mixing valve with a closing function. Fig.2 (a) is a block diagram of the electric mixing valve 5 at the time of mixing, and FIG.2 (b) is a block diagram of the electric mixing valve 5 at the time of closing. In FIG. 2A, the electric mixing valve 5 has a water channel 51 to which water is supplied, a hot water channel 52 to which hot water is supplied, and a mixed hot water channel 53 through which hot water after mixing flows. In the mixed hot water flow path 53, hot water flows vertically upward with respect to the paper surface. And the mixing part 54 which mixes hot water and water has the switching mechanism 55, By driving this switching mechanism 55, the mixing ratio of hot water and water is changed.

  On the other hand, at the time of closing, as shown in FIG. 2 (b), the switching mechanism 55 is driven to close the water channel 51 and the hot water channel 52, and as a result, the mixed hot water channel 53 is fed with hot water. Does not flow.

  Next, the structure of the hot water supply terminal 9 and the hot water supply circuit to the bathtub 7 will be described.

  Between the bathtub 7 and the electric mixing valve 5 with a closing function (bath mixing means), a flow rate detection device 17 (bath flow rate detection means) for detecting the flow rate of hot water supplied to the bathtub 7 and the bathtub 7 are supplied. The thermistor 16 (bath hot water temperature detecting means) for detecting the temperature of the hot and cold water is provided, and the electric mixing valve 5 with a closing function is controlled based on the detection value of the thermistor 16.

  Between the hot water supply terminal (faucet) 9 and the electric mixing valve 8, a flow rate detection device 20 (hot water supply terminal flow rate detection means) for detecting the flow rate of hot water supplied from the hot water storage tank 1 and a hot water supply terminal (faucet). A thermistor 19 (hot water supply terminal hot water temperature detecting means) for detecting the temperature of hot water supplied to 8 is provided, and the electric mixing valve 8 is controlled based on the detected value of the thermistor 19.

  Moreover, in this Embodiment, the control means 10 which controls each load and a functional component, and the remote control 21 which receives the command from a user are provided. Hereinafter, the hot water supply to the bathtub 7 and the hot water supply terminal (faucet) 9 will be described.

  The user sets the desired amount of hot water filling and hot water filling temperature in the bathtub with the remote controller 21 installed in the bathroom, and controls the control means 10 for controlling the hot water filling from the remote controller 21 to the bathtub. By doing so, you can automatically fill the bathtub.

  When it is desired to discharge hot water from the hot water supply terminal (faucet) 9, a desired hot water supply temperature is set by the remote controller 21, and the control means 10 for controlling the hot water temperature of the hot water supply terminal (faucet) 9 is controlled from the remote controller 21. Hot water can be discharged from the terminal (faucet) 9.

  In the present embodiment, a microcomputer is used as the control means 10, and the remote controller 21 is configured to display information or generate a sound in response to a command from the control means 10, so that the user understands. Remote control is easy to do.

  Next, control when hot water is filled in the bath will be described.

  First, when the user starts the bath automatic operation, the user starts the bath automatic operation by pressing the bath automatic button arranged on the remote controller 21. When bath automatic operation is started, an electromagnetic valve (bath circuit shut-off means) 18 provided between the bathtub 7 and the electric mixing valve 5 with a closing function opens.

On the other hand, before the bath operation is started, the electric mixing valve 5 is closed as shown in FIG. Then, after the electromagnetic valve 18 is opened by pressing the bath automatic button, the control means 10 drives the switching mechanism 55 of the electric mixing valve 5 with the closing function, and water gradually increases.
It becomes hot water from a certain position. By gradually increasing the amount of hot water in this way, it is possible to prevent a water hammer during hot water discharge.

  In the present embodiment, the configuration of the electric mixing valve 5 with a closing function is a pole valve type three-way valve, and water flows even when the opening of the electric mixing valve 5 with a closing function is open. There is no closed section, and if the opening of the electric mixing valve 5 with the closing function is further opened from there, it first becomes a water section, and the water volume gradually increases, and then the hot water section where the hot water is mixed It is comprised so that it may become.

  As described above, when the hot water supply to the bath is started and stopped, the amount of hot water flowing in gradually increases from zero, and gradually becomes zero, only by the electric mixing valve 5 with the closing function. Since the water hammer phenomenon can be suppressed with a simple configuration, automatic bath operation can be performed comfortably without making an unpleasant noise.

  In addition, the control means 10 can back up the power supply with the capacity stored in the capacitor. Even if a power failure occurs during pouring, the electric mixing valve 5 with the closing function is closed when a power failure is detected. By driving the opening in such a manner, pouring can be stopped even when power is not supplied.

Then, when bath automatic operation ends, by closing the opening of the electric mixing valve 5 with the closing function and then closing the solenoid valve 18, water hammer at the time of stopping can be prevented. Since the bath pouring circuit can be closed with the electromagnetic valve 18 after preventing the water hammer in this way, the electric mixing valve 5 with the closing function can be stopped due to a failure or the backup circuit of the control means 10 can be used. It is possible to have a double closing mechanism for a failure that prevents hot water from closing when the backup fails due to a power failure, etc. As described above, in a hot-water storage water heater with automatic bath pouring function, About the trouble such as water hammer phenomenon in the hot spring can be suppressed, the temperature of the hot water can be reduced, and the life of the equipment can be extended by suppressing the water hammer phenomenon, and the hot water poured into the bath does not stop. It can provide a hot water supply machine that can perform comfortable and reliable bath pouring, such as a double closing function.

  As described above, the present invention is not limited to a heat pump type hot water storage type hot water heater, and can be used for a hot water heater that prevents water hammer in any system such as electricity, gas, oil, and fuel cell.

Configuration diagram of a hot water storage type water heater in Embodiment 1 of the present invention (A) Configuration diagram of electric mixing valve with closing function (b) Configuration diagram of electric mixing valve with closing function Configuration of a conventional water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat pump 3 Hot water discharge pipe 4 1st water supply pipe 5 Electric mixing valve with a closing function (bath mixing means)
6 Second water supply pipe 7 Bathtub 8 Electric mixing valve (for hot water supply)
9 Hot water supply terminal (faucet)
DESCRIPTION OF SYMBOLS 10 Control means 11 Water refrigerant heat exchanger 12 Compressor 13 Evaporator 14 Expansion valve 15 Water pump 16 Thermistor (bath hot water temperature detection means)
17 Flow rate detection means (bath flow rate detection means)
18 Solenoid valve (bath circuit cutoff means)
19 Thermistor (hot water supply terminal hot water temperature detection means)
20 Flow rate detection means (bath flow rate detection means)
21 Remote control 30 Bath discharge pipe

Claims (3)

A hot water storage tank for storing hot water, a first water supply pipe for supplying water to the lower part of the hot water storage tank, a bath hot water supply pipe for supplying hot water in the upper part of the hot water storage tank to the bathtub, and a second branched from the first water supply pipe A hot water storage type hot water supply comprising a water supply pipe, a bath mixing means for connecting the bath outlet pipe and the second water supply pipe to generate hot water of an appropriate temperature, and the bath mixing means having a closing function Machine. The hot water storage type hot water supply device according to claim 1, further comprising a backup power source capable of driving at least the bath mixing means. An electromagnetic valve for starting and stopping the circulation of hot water is provided between the bath mixing means and the bathtub, and when the pouring to the bathtub is stopped, the bath mixing means is driven to stop the circulation of hot water. The hot water storage type hot water heater according to claim 1 or 2, wherein the electromagnetic valve is closed after the operation.

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