JPH029259B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas instantaneous water heater, and more particularly to a gas instantaneous water heater of a type in which the temperature of hot water is controlled by the amount of gas.

Conventionally, this type of water heater has a control box installed in the kitchen, which controls the switch or volume to supply hot water of around 40°C to 45°C and hot water of around 60°C to 70°C. , it is common to adjust the temperature of the water.

The problem here is that when using a shower with hot water at 40°C to 45°C, you can operate the switch or volume on the control box installed in the kitchen to raise the water temperature to 60°C or higher. If you change the water temperature to 70 degrees Celsius, the shower water temperature will change rapidly and there is a risk of burns.

Therefore, in the case of general outdoor gas instantaneous hot water heaters, a control box (sub-control box) is also installed in the bathroom, and a priority circuit is installed to solve the above problem. This is solved by making sure that only the signal from the sub-control box is transmitted to the control device even if the hot water temperature setting is changed using the switch or volume of the sub-control box.

However, such conventional water heaters have the problem that a control box must be installed in the bathroom as well, which makes installation work cumbersome and increases costs.

The present invention solves the problems of the conventional water heater described above,
The purpose is to eliminate the need to install a sub-control box in the bathroom.

In order to achieve the above object, the gas instantaneous water heater of the present invention includes a water flow detection means which is interposed in the water supply pipe and which senses the flow of water in the water supply pipe and generates a signal, and a burner. A combustion detection means that detects combustion and generates a signal, a control box installed at any location and having one temperature adjustment knob for changing the set temperature, and both or either of the water flow detection means and the combustion detection means. By being equipped with a control device that ignores new temperature setting signals from the temperature control knob while receiving signals from one side, it is possible to change the set temperature by operating the temperature control knob on the control box during hot water supply. This prevents any change in the temperature of the hot water during hot water supply.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, a indicates the main body of the water heater, and the water heater a is equipped with a burner 1 and a heat exchanger 2 disposed above it, as well as a fan 3 at the bottom. It is configured to supply part of the air as primary air for combustion and the rest as secondary air.

The water heater a also includes a wind pressure switch 4 that senses the operation of the fan 3, an igniter 5 that sends a spark between it and the burner 1, and ignites the gas ejected from the flame port of the burner 1, and a flame rod that senses the combustion of the gas. 6, etc., and these are electrically connected to a control device c, which will be described later.

On the other hand, a gas supply pipe 7 is connected to the burner 1, and a water supply pipe 8 is connected to the heat exchanger 2 on its inlet side.
A hot water supply pipe 9 is connected to the other end.

The free end of the gas supply pipe 7 is connected to the casing of the water heater a.
A gas pipe connection part 10 is formed so as to protrude from an arbitrary surface of a', and a gas supply pipe 7 is connected through the connection part 10.
A gas pipe 11 is connected to.

In addition, the free ends of the water supply pipe 8 and the hot water supply pipe 9 each protrude to an arbitrary surface of the casing a', and the water supply pipe connection part 1
2. A hot water supply pipe connection part 13 is formed, and corresponding pipes, namely a water supply pipe 14 and a hot water supply pipe 15, are connected to each of the connection parts 12 and 13, respectively.

The hot water supply pipe 15 has a plurality of hot and cold water mixing faucets at its terminals, in the illustrated example, hot and cold water mixing faucets 16 and 17 in the washroom and kitchen, and two hot and cold water mixing faucets 18 in the bathroom.
19, and a shower 20 is installed in one of the two hot water mixing faucets 18 and 19 in the bathroom.

The hot water mixing faucets 16, 17, 18, and 19 are also connected to the water supply pipe 14, respectively, and the hot water supply pipe 1
The hot water supplied through 5 can be appropriately mixed with water from the water pipe 14 and discharged.

On the other hand, in the gas supply pipe 7, sequentially from the upstream side,
Original valves 21, 22, governor 23, proportional valve 24
The water supply pipe 8 is provided with a water flow sensor 25, a water supply temperature sensor 26, and a water valve 27 in order from the upstream side.
However, the hot water supply pipe 9 is provided with a hot water temperature sensor 28, and the above-mentioned main valves 21, 22 and the proportional valve 2 are connected to each other.
4. The water flow sensor 25, the water supply temperature sensor 26, the water valve 27, and the hot water temperature sensor 28 are connected to the control device c.
is electrically connected to.

The control device c is housed in the box 29 and is connected to the water heater a.
It is arranged in the casing a' of the casing a', and is connected to an outlet, that is, a power source 31, via a plug 30, etc., and is also connected to a control box d installed in a kitchen or the like.

The control box d is equipped with an ON/OFF switch 32, an operation lamp 33, a combustion lamp 34, and a temperature control knob 35. This temperature control knob 35 is for setting the hot water temperature, and in the illustrated example, there are three levels. It is now possible to set the temperature.

The control device c is equipped with an arithmetic operation and amplification circuit, and has a temperature control knob 3 of the control box d.
The required amount of heat is calculated from the set temperature set in step 5, the incoming water temperature detected by the water supply temperature sensor 26, and the amount of water detected by the water amount sensor 25, and the signal is amplified and sent to the electromagnetic coil 24' of the proportional valve 24. Proportional valve 2
While the water amount sensor 25 detects the amount of water flowing through the water supply pipe 8 and issues a signal, or when the flame rod 6
While the sensor detects combustion in the burner 1 and sends a signal, the signal is ignored even if the temperature control knob 35 is newly operated to change the set temperature. The control device c also has a function to throttle the water valve to adjust the amount of water to match the capacity when the amount of water detected by the water amount sensor 25 exceeds the capacity of the water heater a.

When the ON/OFF switch 32 of the control box d is turned ON, the operation lamp 33 of the water heater is turned on and the water heater is put into operation.

At this time, water is not yet flowing through the water supply pipe 8, so the water flow sensor 25 cannot detect the flow of water.

Next, in this state, when you open any hot water mixer faucet, for example, the hot water mixer faucet 18 equipped with the shower 20, and use the shower 20, water flows from the water pipe 14 to the water supply pipe 8, and the water supply temperature sensor 26 detects the incoming water temperature, and a water amount sensor 25 detects the water amount and sends a signal to the control device c.

The control device c receives the signals from the feed water temperature sensor 26 and the water amount sensor 25, rotates the fan 3, and calculates the optimal gas amount based on the incoming water temperature, water amount, and preset temperature,
A signal is sent to the electromagnetic coil 24' of the proportional valve 24, and the proportional valve 24 is adjusted to the optimum opening degree.

When the wind pressure switch 4 senses the wind pressure, the gas valves 21 and 22 are opened and the required amount of gas is ejected from the flame port of the burner 1. At the same time, a spark flies from the igniter 5 to ignite the gas, and the burner 1 starts combustion.

Therefore, hot water at the set temperature is discharged from the shower 20.

While the shower 20 is in use, the water flow sensor 25 detects the water flow, and the flame rod 6 detects the combustion of the burner 1 and continues to output signals. For example, even if you try to use the hot water mixer faucet 17 in the kitchen and change the set temperature by operating the temperature control knob 35, that signal is ignored and the shower 20
There is no change in the temperature of the hot water discharged from the tank.

In the above embodiment, the water amount sensor 25 and the water supply temperature sensor 26 are provided, and these sensors 25, 2
Although the water heater of the type that adjusts the gas amount by calculating the required gas amount based on the detected water supply amount, inlet water temperature, and preset temperature in step 6 has been described, the present invention is applicable to other types of water heaters, such as hot water A water flow switch is installed on the water inlet side of boiler a, and a hot water temperature detection thermistor is installed on the hot water outlet side.
The water flow switch turns on when more than a certain amount of water flows.
The burner starts combustion, and the hot water temperature is preset by the temperature control knob on the control box.In other words, the difference between the set temperature and the actual hot water temperature is calculated, amplified, and proportional. The same method can be applied to water heaters that control the temperature of hot water by changing the opening degree of the valve to adjust the amount of gas. In this case, while the water flow switch is sensing the water flow, Configure to ignore new temperature setting signals.

Furthermore, a thermocouple may be used instead of a flame rod as the combustion detection means.

Since the present invention has the above configuration, it has the following advantages.

(1) Even if you change the set temperature while hot water is being supplied, the signal will be ignored, so there is a risk of injury if the set temperature is changed by mistake while the shower is in use, causing the shower water temperature to change suddenly and causing burns. do not have.

(2) In order to prevent the risk of burns caused by sudden changes in the shower water temperature caused by accidentally changing the set temperature while using the shower, a sub-control box with a priority circuit is installed so that the There is no need to give priority to the temperature setting in this sub-control box, or to install multiple control boxes and selectively switch the priority between the multiple control boxes, and the water heater installation work is simplified. It's easy and costs less.

[Brief explanation of drawings]

The drawing is a schematic diagram of a gas instantaneous water heater showing an embodiment of the present invention. a... Water boiler, c... Control device, d... Control box, 1... Burner, 6... Combustion detection means (flame rod), 8... Water supply pipe, 25
...Water flow detection means (water amount sensor), 35...Temperature control knob.

Claims (1)

[Claims] 1. In a gas instantaneous water heater that controls the hot water temperature by the amount of gas and supplies hot water to multiple locations, a water flow detection means is provided in the middle of a water supply pipe and detects the flow of water in the water supply pipe and generates a signal; Combustion detection means that detects combustion in the burner and generates a signal; a control box that is installed at any location and has a temperature adjustment knob that changes the set temperature; and both or either of the water flow detection means and the combustion detection means. 1. A gas instantaneous water heater, comprising: a control device that ignores a new temperature setting signal from a temperature control knob while receiving a signal from one side.