JPH0429942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water heater that can automatically supply hot water to a bathtub, a kitchen, and other areas.

(Prior art) In order to automatically supply hot water to the bathtub and to the kitchen and other areas, a bathtub hot water system leading to the bathtub and other hot water systems are connected downstream of the heat exchange section of the water heater. Conventional water heaters are configured to automatically supply hot water to the bathtub and to the kitchen and other areas at the same time.

(Problem to be Solved by the Invention) However, with this configuration in which hot water is supplied simultaneously, it becomes impossible to obtain a sufficient amount of hot water both to the bathtub and to other places. The problem was that hot water was not hot enough, for example, at about 40°C, which is the temperature of hot water supplied to the bathtub.

The present invention aims to solve such conventional problems.

(Means for Solving the Problems) The configuration of the present invention for solving the above problems will be explained with reference to drawings corresponding to embodiments. 1, a bathtub hot water supply system 4 leading to the bathtub 3 and another hot water supply system 5 are branched, and the bathtub hot water supply system 4 is provided with a valve device 6, and the other hot water supply system 5 is provided with a flush switch 7. , the valve device 6 is closed by a flowing water detection signal from the flowing water switch 7, and a flow rate sensor 9 is provided upstream of a branch point 8 between the bathtub hot water supply system 4 and another hot water supply system 5; Temperature sensors 16, 1 are provided on the upstream and downstream sides of the heat exchange section 1.
4 is provided, and the temperature sensor 16 and the flow rate sensor 9 on the upstream side are used as components for controlling the feed of the burner 15 of the water heater 2, and the flow rate sensor 9
is used as a component for controlling the amount of hot water supplied to the bathtub 3.

(Function) In the above configuration, when hot water is not being supplied in other hot water supply systems 5, hot water can be supplied to the bathtub 3 via the bathtub hot water supply system 4. At this time, the amount of hot water supplied per unit time can be detected by the flow rate sensor 9, so an appropriate control means (not shown) configured using a microcomputer or the like is used.
By adding up the total amount, the amount of hot water supplied can be controlled, and thus a preset amount of hot water can be automatically supplied. When hot water is supplied to the bathtub 3 in this manner, there is little variation in the amount of hot water supplied, so the hot water temperature is controlled by detecting the hot water temperature with a temperature sensor 14 provided on the downstream side of the heat exchange section 1, and setting this hot water temperature in advance. Burner 15 so that the temperature is around 40℃, for example.
Appropriate hot water temperature control such as so-called feedback control, which controls the combustion amount of water, can be applied.

Therefore, when hot water is being supplied to the bathtub 3 as described above, if hot water is started to be supplied from another hot water supply system 5 to the kitchen etc. and the running water switch 7 issues a running water detection signal, this running water detection signal causes the valve device 6 to is closed. Therefore, hot water supply in the bathtub hot water supply system 4 is temporarily interrupted, and only hot water is supplied through the other hot water supply system 5. Therefore, the temperature of hot water supplied through the hot water supply system 5 can be controlled to a desired temperature independently of the temperature of hot water supplied to the bathtub 3, and thus a sufficient amount of hot water can be supplied at a sufficient temperature. Such hot water temperature control in hot water supply involves detecting the temperature of water entering the heat exchanger 1 with a temperature sensor 16, and detecting the amount of hot water or amount of water supplied with a flow rate sensor 9, and adjusting the desired hot water temperature based on the detection signal. It is possible to apply so-called feed-forward control, which calculates the required amount of heat for the water supply and controls the burner 15 by proportional control etc. to obtain this required amount of heat. The hot water temperature can be accurately and stably obtained.

Next, when the hot water supply through the other hot water supply system 5 is stopped and the flowing water switch 7 no longer issues a flowing water detection signal, the valve device 6 is opened again and the bathtub hot water supply system 5
Water supply through the facility will be resumed. In this case, by storing the total amount of hot water supply up to the above-mentioned temporary interruption in the control means and adding the amount of hot water supply after restarting to the stored total amount of hot water supply, the above-mentioned temporary A preset desired amount of hot water can be supplied to the bathtub 3 without being affected by the interruption.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

Reference numeral 2 is a water heater, 1 is a heat exchanger, and 15 is a burner. On the downstream side of the heat exchange section 1, there is a bathtub hot water supply system 4 leading to the bathtub 3, and another hot water supply system 5 to the kitchen etc.
It has a branch structure. Reference numeral 8 indicates a branch point. The bathtub hot water supply system 4 is provided with a valve device 6, and the other hot water supply system 5 is provided with a flowing water switch 7, and the valve device 6 is controlled to be closed by a flowing water detection signal from the flowing water switch 7. Further, a flow rate sensor 9 such as a rotary type is provided on the upstream side of the heat exchange section 1, which is the upstream side of the branch point 8, and a temperature sensor such as a thermistor is provided on the upstream side and downstream side of the heat exchange section 1. 16 and 14 are provided. The temperature sensor 14 on the downstream side is configured to detect the temperature of the hot water output from the heat exchanger 1, that is, the hot water supply temperature, and to feedback control the combustion amount of the burner 15 so that the detected hot water temperature becomes a preset temperature. There is. Also, the upstream temperature sensor 1
6 detects the temperature of water flowing into the heat exchanger 1, that is, the temperature of water entering the heat exchanger 1, and detects the detected water temperature and the flow rate sensor 9.
The required amount of heat for a desired hot water supply temperature is calculated based on the detected water supply amount, and the combustion amount of the burner 15 is controlled in a feedforward manner to obtain the required amount of heat.

Each of the above controls is performed by appropriate control means (not shown) using a microcomputer or the like. The control means is configured to total the amount of hot water supplied when the water flow switch 7 is not emitting a water flow detection signal based on the amount of water supply detected by the flow rate sensor 9.

On the other hand, the bathtub hot water system 4 includes an atmosphere open tank 11.
A water supply device 10 that is open to the atmosphere is provided with a ball tap 17 in the water supply section and a two-way valve 6 such as an electric ball valve on the upstream side, and this two-way valve 6 is configured as the valve device. There is. Further, the bathtub hot water supply system 4 includes the atmospheric open water supply device 1.
A three-way valve 12 and a pump 13 are sequentially provided between the three-way valve 12 and the bathtub 3, and a reflux path 18 is formed between the three-way valve 12 and the bathtub 3. In this configuration, the three-way valve 12 is operated to circulate hot water in the bathtub 3 by the pump 13 via the reflux route 18, the three-way valve 12, and the pump 13, and a reheating heat exchanger is installed at an appropriate location in this circulation route. The structure is such that reheating can be performed by heating at a portion (not shown).

In the figure, only the heat exchange section 1 and the burner 15 are shown enclosed in the water heater 2 for convenience, but it goes without saying that the water heater 2 may include a structure in which the above-mentioned components are integrated as appropriate.

(Effects of the Invention) As described above, the present invention provides a water heater that is capable of automatically supplying hot water to a bathtub and hot water to the kitchen and other areas, in which a signal for a flush switch provided in a hot water supply system other than the bathtub is provided. The system controls the valve device installed in the bathtub hot water supply system so that when automatic hot water supply to the bathtub and hot water supply to the kitchen or other areas overlap, priority is given to the latter hot water supply and the former hot water supply is temporarily interrupted. Therefore, the latter hot water supply temperature is the former hot water supply temperature, for example, approximately
The desired temperature can be controlled independently of 40° C., and a sufficient amount of hot water can be supplied at a sufficient temperature in other hot water supply systems. In particular, the present invention provides a flow rate sensor, which is essential for obtaining the total amount of hot water supply in automatic hot water supply, on the upstream side of the branch point of both hot water supply systems, and
A temperature sensor is also installed on the upstream side of the heat exchanger, and the hot water supply temperature can be controlled feed-forward in other hot water supply systems. In the hot water supply system, the flow rate sensor, which is a component for stably obtaining the desired hot water supply temperature and for performing such feed forward control, is used to control the amount of hot water supply in the bathtub hot water supply system, as described above. Since the configuration is also used as a component, the configuration is simplified and the water heater can be configured at low cost.

[Brief explanation of drawings]

The figure is a system explanatory diagram showing an embodiment of the present invention. Code 1... Heat exchange section, 2... Water heater, 3... Bathtub, 4... Bathtub hot water supply system, 5... Other hot water supply system,
6... Valve device, 7... Water flow switch, 8... Branch point, 9... Flow rate sensor, 10... Atmospheric open water supply device, 11... Atmospheric open tank, 12... Three-way valve,
13...Pump, 14, 16...Temperature sensor, 1
5...burner, 17...ball tap, 18...
Reflux route.

Claims (1)

[Claims] 1. On the downstream side of the heat exchange section of the water heater, a bathtub hot water supply system leading to the bathtub and other hot water supply systems are configured in a branched manner, and a valve device is provided in the bathtub hot water supply system, and a flush switch is provided in the other hot water supply system. , the valve device is configured to be closed by a flowing water detection signal from the flowing water switch, a flow rate sensor is provided upstream of a branch point between the bathtub hot water supply system and another hot water supply system, and a flow rate sensor is provided on the upstream side of the heat exchange section. and a temperature sensor on the downstream side,
A hot water supply device characterized in that the upstream temperature sensor and flow rate sensor are used as components for feedforward control of a burner of a water heater, and the flow rate sensor is used as a component for controlling the amount of hot water supplied to a bathtub. .