JP2002089955A - Bath device with hot water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform delivery of hot water at stable temperature. SOLUTION: When the switch on hot side of a bath remote controller is pressed at S1, this bath device controls a water flow rate control valve into its minimum opening at S2, and opens a water flow rate control valve at S3, and also operates the water flow rate control valve into an opening corresponding to the control water flow rate. Next, at S4, this judges whether the supply water flow rate detected with a water flow rate sensor has reached the control water flow rate or not, and if has not reached the control water flow rate, this performs the flow control to regulate it into the control water flow rate by operating the water flow rate control valve at S5, and if it reaches the control water flow rate, this executes the ignition control of a burner at S6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath apparatus equipped with a water heater for automatically supplying a predetermined amount of hot water heated by a water heater to a bath tub to perform hot water filling, hot water supply, and the like.

[0002]

2. Description of the Related Art A bath apparatus with a water heater is provided with a water heater for heating water passing through a heat exchanger with a burner, and from the water heater to an empty bathtub, a hot water set at a temperature of 38 to 48 ° C. Can be executed by automatically supplying a predetermined amount of hot water to the bathtub, or by hot-water supply of automatically supplying a predetermined amount of high-temperature (for example, 80 ° C.) hot water to the bathtub when the temperature of the hot water in the bathtub after the bathing has dropped. I have. Further, in the bath apparatus with a water heater, a water flow control valve is provided in a water supply pipe to the water heater so as to obtain a stable tap water temperature, and the amount of water flowing through the appliance during hot water supply is controlled. For example, in the case of the above-mentioned high-temperature hot water supply, a smaller water flow rate (for example, 5 liters / mi) than in the case of general hot water supply or hot water filling.
n).

[0003]

However, since the normal water flow control valve is set to be in a fully open state when the operation switch is turned on, the operation switch is turned on to perform high-temperature hot water supply control first. When performing this, the water flow control valve is throttled from the fully opened state to a small opening with a low flow rate, and the control delay at this time causes the water flow control valve to overshoot (too narrow). For this reason, high-temperature hot water supply is started with a water flow rate smaller than the water flow rate set for high-temperature hot water supply, and the tapping temperature temporarily rises. Therefore, in Japanese Patent No. 2643889, when the hot water supply is started, the water flow control valve is once set to the minimum opening degree and then controlled to the small opening degree which is set, so that the tap water temperature is increased. Although an invention that suppresses fluctuations is disclosed, since this technique ignites the burner while changing the flow rate at the rise, the hot water temperature at the rise tends to be unstable, and the flow rate is small. If the burner is ignited, it may boil.

[0004] Therefore, an object of the present invention is to provide a bath apparatus with a water heater, which is capable of performing high-temperature hot water supply at a stable tap water temperature from the start without a risk of boiling. is there.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, when hot water is supplied, the water amount control valve is once set to a minimum opening degree or near the minimum opening degree. After that, the opening of the water flow control valve is controlled so that the flow rate becomes a control flow rate preset for hot water supply, and the burner is ignited after the flow rate reaches the control flow rate. is there. The minimum opening degree in the present invention includes the fully closed state of the water amount control valve.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view schematically showing a bath apparatus with a water heater (hereinafter, referred to as a “bath apparatus”). In the bath apparatus 1, reference numeral 2 denotes a combustion chamber, in which a plurality of burners 3 are provided.
3, 3 and a heat exchanger 4, and a gas pipe 5 is a branch pipe 6,
It is branched into 6, 6 and connected to each burner 3. Each branch pipe 6 is provided with a switching solenoid valve 7, and the gas pipe 5 before branch is provided with an original solenoid valve 8 and a proportional control valve 9. Reference numeral 10 denotes a fan for supplying combustion air to the combustion chamber 2. Further, a water supply pipe 11 connected to a water pipe and a tapping pipe 12 for sending out heated hot water are connected to the heat exchanger 4, respectively, and a heat exchange pipe is provided between the supply pipe 11 and the tapping pipe 12. A bypass pipe 13 for bypassing the vessel 4 is connected. And the water pipe 1
Reference numeral 1 denotes a water amount sensor 1 for detecting the amount of water passing through the water supply pipe 11.
4, an incoming water temperature thermistor 15 for detecting the incoming water temperature, and a water flow control valve 16 for adjusting the amount of water flowing through the appliance, respectively, while the outlet pipe 12 has outlet water temperature thermistors 17, 18 for detecting the outlet temperature, a hot water tap. 19 are provided respectively.

[0007] A bathtub 20 is connected to a drop tube 22 via a bus adapter 21. The drop pipe 22
The upstream side and the downstream side of the connecting portion of the tapping pipe 12 with the bypass pipe 13 are connected by branch pipes 23, 23, respectively, and each branch pipe 23 is provided with a water solenoid valve 24, 25. The drop pipe 22 is provided with a drop flow sensor 26 and check valves 27, 27, respectively. The bathtub 20 is provided with a bath thermistor 28 for detecting the temperature of hot water in the bathtub 20. 29 is a controller, 30 is a bath remote controller, 31 is a hot water remote controller, and the controller 2
9, a frequency signal and a temperature detection signal from each sensor and thermistor are input, and according to an instruction from each remote controller,
Opening and closing of each solenoid valve, adjustment of the opening of the proportional control valve and water flow control valve,
Control of the number of revolutions of the fan motor and the like are performed, and normal hot water supply control, hot water filling control for the bathtub 20, high-temperature hot water supply control, and the like are executed as described later.

That is, in the ordinary hot water supply control, when the hot water tap 19 is opened and the water flow sensor 14 detects that the water flow through the appliance has reached the ignition water flow (2.5 liters / min), the controller 29 turns on. After the fan 10 is rotated and pre-purged, the original solenoid valve 8 and each switching solenoid valve 7 are opened to supply gas to each burner 3 and operate the igniter to ignite each burner 3. Therefore, the water supply pipe 11
Is heated when passing through the heat exchanger 4, becomes hot water, and is sent out from the tapping pipe 12. Next, the controller 29 determines that the tap water temperature obtained by the tap water temperature thermistors 17 and 18 is 38 to 38 by the bath remote control 30 or the hot water supply remote control 31.
To match the set temperature set in the range of 60 ° C,
Opening / closing of each switching electromagnetic valve 7 and adjustment of the opening of the proportional control valve 9 are performed, and water flow is adjusted by the water flow control valve 16. On the other hand, in the automatic hot water supply to the bathtub 20, when the automatic switch of the bath remote controller 30 is pressed, the water solenoid valve 24 is opened and water flows in the appliance, so that the burner 3 is ignited as described above. Therefore, the hot water heated by the heat exchanger 4 is sent from the tapping pipe 12 to the bathtub 20 via the branch pipe 23 and the drop pipe 22. When the dropping amount monitored by the dropping flow sensor 26 reaches the set hot water amount, the water solenoid valve 24 closes and the filling is finished.

A description will now be given, with reference to the flow chart of FIG. 2, of a high-temperature hot water supply control in a case where hot water is supplied after hot water filling. In S1, when the collecting switch of the bath remote controller 30 is pressed, in S2, the water amount control valve is maintained in the fully opened state immediately after the operation switch is turned on, and is maintained in the vicinity of the fully opened state when the general hot water is supplied at a relatively low temperature immediately before. 16 is controlled to the minimum opening. The reason why the water amount control valve 16 is once controlled to the minimum opening degree is to prevent a sound generated in the piping when the valve is rapidly opened and closed in the appliance, that is, a so-called water hammer. Next, in S3, the water solenoid valve 25 is opened to allow water to flow through the appliance, and the water amount control valve 16 is opened.
Is operated to the opening corresponding to the control water amount (5 l / min) preset for hot water supply, and in S4,
It is determined whether or not the flow rate detected by the flow rate sensor 14 has reached the control flow rate. If the control water amount has not been reached here, the flow rate control for adjusting the control water amount by further operating the water amount control valve 16 is performed in S5, and if the control water amount has been reached,
In S6, the ignition control of the burner 3 is executed, and hot water of 80 ° C. is supplied to the bathtub 20.

After the ignition, it is monitored in step S7 whether or not the flow rate is equal to or more than the extinguishing water amount (4 liters / min). If the amount is less than the extinguishing water amount, the original electromagnetic valve 8 and the switching electromagnetic valve 7 are closed, and the burner 3
Is extinguished (S8).
, The flow control is continued, and the drop amount obtained by the drop flow sensor 26 in the determination of S10 is 1 in total.
When the water reaches 0 liter, the water electromagnetic valve 25 is closed in S11, the original electromagnetic valve 8 and the switching electromagnetic valve 7 are each closed to extinguish the burner 3, and the water amount control valve 16 is fully opened.

As described above, according to the bath apparatus of the above embodiment,
At the time of high-temperature hot water supply, after the water flow control valve 16 is once set to the minimum opening, the opening of the water flow control valve 16 is controlled so that the water flow becomes the control water flow. By igniting the burner 3 after reaching the amount of water, the burner 3 is heated in a state in which the flow rate is stabilized, so that the tapping temperature is stabilized and there is no danger of boiling. Also, the water amount control valve 16
Is once set to the minimum opening degree and then increased to the opening degree corresponding to the control water amount, which leads to prevention of water hammer. In the above embodiment, the water amount control valve 16 is controlled to the minimum opening in S2. However, the control is not limited to the minimum opening, and the control of the control water amount may be performed by keeping the water amount control valve 16 near the minimum opening. The temperature is stabilized, and boiling and water hammer can be prevented. Also, the minimum opening is the water flow control valve 16
May be fully closed.

[0012]

According to the first aspect of the present invention, when hot water is supplied, the water flow control valve is once set to the minimum opening degree or near the minimum opening degree, and then the water flow rate is set for hot water supply. By controlling the opening of the water amount control valve so that the control water amount is set in advance and igniting the burner after the water flow amount reaches the control water amount, heating is performed in a state where the flow rate is stable. As a result, the tapping temperature is stabilized, and there is no danger of boiling. In addition, since the water amount control valve is once set to the minimum opening degree and then increased to the opening degree corresponding to the control water amount, it leads to prevention of water hammer.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a bath apparatus with a water heater.

FIG. 2 is a flowchart of hot water supply control.

[Explanation of symbols]

1. Bath apparatus with water heater, 2. Combustion chamber, 3. Burner, 4. Heat exchanger, 11. Water pipe, 12. Hot water pipe, 13. Bypass pipe, 14. Water sensor , 16.
・ Water control valve, 20 ・ ・ Bathtub, 22 ・ ・ Piping pipe,
24, 25 ... water solenoid valve, 29 ... controller.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L024 CC19 CC21 DD04 DD05 DD13 DD14 DD16 DD22 EE03 GG03 GG04 GG06 GG22 GG24 GG38 HH13 HH14 HH24 HH26 HH30

Claims (1)

[Claims] 1. A water heater capable of supplying hot water at a predetermined temperature by a burner for heating water passing through a heat exchanger and a water flow control valve for adjusting a flow rate of water flowing through the appliance. A bath apparatus with a water heater capable of automatically supplying a predetermined amount of high-temperature hot water to a bathtub, wherein when performing the high-temperature hot water supply, the water amount control valve is once set to a minimum opening degree or a minimum opening degree. After that, the opening degree of the water amount control valve is controlled so that the water flow amount becomes a control water amount set in advance for the high-temperature hot water supply, and the burner reaches the control water amount after the water flow amount reaches the control water amount. A bath apparatus with a water heater characterized by ignition.