JPS61114047A - Hot-water supply device - Google Patents

Abstract

PURPOSE:To prevent rapid emission of large amount of hot-water to the tap by a method wherein a water quantity valve is maintained under throttled condition in case that a cock is closed at the throttled condition of the water quantity valve of a tap-controled hot-water heater, and the tap is opened after the designated time. CONSTITUTION:A controller 15 is arranged in the base frame of a hot-water heater A or in a control box 16, the controller 15 controls the intermittent burning of a burner 6. When the calculated and required amount of heat exceeds the capability of the hot-water heater A, a water quantity valve 10 is throttled, the flow rate is decreased within the capability. When a valve B is stopped under the above condition, the water quantity valve 10 is made full opening condition after designated time (3min). Simultaneously, a pump 7 is restarted, the hot-water is maintained at designated temperature with circulating and flowing, prepares the next opening of the valve B. At the opening of the valve B, the water quantity valve 10 is still under throttled condition, accordingly, the large amount of hot-water supplying can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water heating device comprising a combination of a gas instantaneous water heater and a faucet.

In this specification, the faucet is not limited to a single faucet, but also includes a thermostatic type, a mixing valve type, a two-valve type, and other hot and cold water mixing faucets.

(Prior Art) Conventionally, there have been various structures for hot water supply devices, especially water supply II devices consisting of a combination of a gas instantaneous water heater and a faucet. Some water heaters have a structure that controls the temperature and are equipped with a water flow valve in the hot water supply pipe that automatically reduces the water flow when the required amount of heat calculated by calculation exceeds the capacity of the water heater.

When the water flow valve of a faucet is throttled and the amount of hot water supplied is throttled, the water side is naturally throttled according to the hot water side in order to maintain the discharge temperature at the set temperature, and this condition is not corrected immediately after the on-off valve is closed. .

Therefore, if you open the water flow valve immediately after closing the on-off valve of a faucet, if you stop using the faucet and then use it again immediately, the water side will be throttled and the amount of water will suddenly increase. Hot water will be supplied to the faucet, which is very dangerous as the water will be discharged from the faucet at a much higher temperature than the set temperature.

(Problem to be Solved by the Invention) The problem to be solved by the present invention is that when hot water supply is stopped with the water flow valve being throttled, a large amount of hot water is supplied to the faucet within a predetermined period of time after the water supply is stopped. The aim is to avoid supplying such substances.

(Means for Solving the Problems) The technical means taken by the present invention to solve the above-mentioned problems are as follows. The required amount of heat is calculated based on the detection signal of the outlet hot water temperature sensor, and the combustion of the burner is controlled automatically, and a valve is installed in the hot water supply pipe that reduces the flow rate when the calculated required heat exceeds the capacity of the supply IIm. It consists of a gas instantaneous water heater installed and a faucet that supplies hot water at a predetermined temperature from the water heater and discharges hot water at a set discharge temperature. When it is stopped, it automatically returns to the fully open state after a predetermined period of time has elapsed after the heating stop.

(Function) Therefore, even if you once close the #4 closing valve of the faucet with the water volume valve throttled, and then open the valve again within a predetermined period of time, for example 3 minutes, and use it again, the water volume valve will still be closed. Since it remains closed, a large amount of hot water will not suddenly flow into the faucet.

In addition, during the above-mentioned predetermined time, the water supply pipe from the faucet to the heat exchanger is cooled by heat radiation, and even if the water flow valve returns to full open, hot water will not be discharged when the faucet is used, and you will not get burned. do not have.

(Example) An embodiment of the present invention will be described below with reference to FIG.

The water heating system consists of a gas instantaneous water heater (A) and a thermostatic mixing valve (B).

The thermostatic mixing valve (B) has a conventionally well-known structure using a wax pellet as a temperature sensor.

In the water heater (A), gas supplied through a gas pipe (11) is burned in a burner (6), and water supplied through a water supply pipe (1) is burned in a heat exchanger (9). The hot water is heated and flows through the hot water supply pipe (4) to the thermostatic mixing valve (B).

In addition, this water heater (A) branches a return pipe (8) from the hot water supply pipe (4) as close as possible to the thermostatic mixing valve (B), and connects the return pipe (8) to the water supply pipe (1). ) A pump (7) with a small capacity with a flow rate of about 2 J/min is installed in the return pipe (8) to drain water in the pipe when hot water is not coming out from the thermostatic mixing valve (B). Water supply pipe (1), heat exchanger (9)
, a hot water supply pipe (4), and a return pipe (8).

In the gas pipe (11), from the upstream side, there is a sequential solenoid valve (12), a solenoid valve (13), and a governor (14).
However, in the water supply pipe (1), water flow sensors (
2) and an incoming water temperature sensor (3), and the hot water supply pipe (4) is provided with an outlet hot water temperature sensor (5) and a water flow valve (10), respectively.

The water flow sensor (2) is connected to the return pipe (1) of the water supply pipe (1).
8) A water flow valve (10) located downstream from the connection part.
is arranged downstream of the outlet hot water temperature sensor (5).

In addition, the original solenoid valve (12), solenoid valve (13), water flow sensor (2), inlet water temperature sensor (3), outlet water temperature sensor (
5), the water flow valve (10) and the pump (7) are each electrically connected to the controller (15).

The controller (15) is installed inside the water heater (A) or inside the control box (16), and is connected to the rONJ of the operation switch (17) of the control box (16).
Upon activation, the pump (7) starts operating, and at the same time opens the main solenoid valve (12), and also displays the flow rate detected by the water sensor (2), the inlet water temperature detected by the inlet water temperature sensor (3), and the control box. (16) Temperature setting part (18)
The required amount of heat is calculated based on predetermined factors such as the set temperature set in , the hot water temperature detected by the hot water temperature sensor (5), the thermal efficiency of the heat exchanger (9), and the proportional gain. The solenoid valve (13) is configured to open and close at appropriate intervals and times.

Further, the controller (15) stops the operation of the pump (7) by using the thermostatic mixing valve (B), and also stops the operation of the pump (7) when a predetermined period of time, for example, 3 minutes has elapsed since the stop of use of the thermostatic mixing valve (B). ), and when the above-calculated required heat amount exceeds the capacity of the water heater (A), the water volume valve (10) is throttled, and with this water volume pulp (10) throttled, the thermostatic mixing valve (B) is restarted. ) is configured to return the water volume pulp (10> to the fully open state after a predetermined period of time (3 minutes) has elapsed, similar to when the pump (7) is restarted).

The use of the above thermostatic mixing valve (B) is based on the calculated required amount of heat, which is the maximum amount of heat expected to be required to boil the circulating and flowing 'IM (water) to the set temperature and maintain the temperature at the set temperature. By setting an appropriate value with some margin, for example, exceeding 150Kcal/min,
Further, the suspension of use of the thermostatic mixing valve (B) is determined by the fact that the water flow rate sensor (2) no longer detects the flow rate.

Although not shown, there is an igniter near the burner (6) that discharges electricity in synchronization with the opening of the electromagnetic valve (13), or ignites when the operation switch (17) is turned ON. Of course, a pilot burner is provided for a pilot flame that is extinguished by rOFFJ operation.

Therefore, with the on-off valve of the thermostatic mixing valve (B) closed, the control box (1
6) Operation switch (17) t.

When turned ON, the main solenoid valve (12) opens and the pump (7) starts rotating to pump water into the water supply pipe (1).
) to the heat exchanger (9), the hot water supply pipe (4), and the return pipe (8
) to return to the water supply pipe (1) before the water flow sensor (2), and at the same time the controller (15
) calculates the amount of heat required to boil this circulating water to a set temperature, and opens and closes the solenoid valve (13) at intervals and times according to the calculated required amount of heat.

Therefore, the burner (6) burns intermittently at intervals and times according to the calculated required amount of heat to heat the circulating water.

At the time of cooking, the intermittent combustion of the burner (6) is controlled by the controller (
15), the ratio of the time the fire is on and the time the fire is extinguished is controlled based on the above calculation, so the circulating water is boiled up to the set temperature and maintained at the set temperature.

Next, when the thermostatic mixing valve (B) is opened, the hot water in the piping that has already been boiled to the set temperature is supplied to the thermostatic mixing valve (B).
Subsequently, water newly supplied from the water supply pipe (1) is heated to the set temperature and then supplied.

At this time, the pump (7) stops operating, and if the calculated required heat exceeds the capacity of the water heater (A>), the water pulp (10) is throttled to reduce the flow rate and bring it within the capacity range. Contain.

When the use of the thermostatic mixing valve (B) is stopped with the water volume pulp (10) being squeezed, the water volume valve (10) is stopped after a predetermined time (3 minutes) has passed since the stop.
) returns to the fully open state, and at the same time the pump (7) resumes operation.

Therefore, the hot water in the pipe is again circulated and maintained at the set temperature, with the next use of the thermostatic mixing valve (B).

In the above description, the water heater was described as one in which the burner is fired intermittently and the temperature is controlled by the ratio of the combustion time to the extinguishing time. It is also possible to use a system that controls the above, or a combination of both of the above methods.

Next, other embodiments are shown in FIGS. 2 and 3.

Figure 2 shows the gas instant water heater shown in Figure 1.
It is the same as the 1m boiler without the return pipe and pump, except that hot water is not circulated, and a two-valve mixer faucet is used as the faucet.

In FIG. 3, a single faucet is used as the faucet, and other points are the same as those in FIG. 2.

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

(1) If you stop using the faucet while the water layer valve is constricted, the water pulp will remain constricted for a predetermined period of time, so the faucet will not be reused during that time. However, there is no sudden flow of boiling water, and there is no danger of getting burnt from hot water spewing out from the faucet.

1 After a predetermined period of time has passed, the water flow pulp returns to its fully open state, but during that time the water temperature in the hot water supply pipes from the various faucets to the heat exchanger cools down due to heat radiation, and even if the faucet is reused, it will remain hot. Hot water does not come out, and the predetermined S temperature is discharged.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a heating device using thermostatic mixing pulp. FIG. 2 is a schematic diagram of a two-pulp mixing water heater. FIG. 3 is a schematic diagram of a water supply device using a single faucet (hot water cup). A... Gas instantaneous water heater 8... Faucet 1... Water supply pipe 2... Flow rate sensor 3... Incoming water temperature sensor 4... Hot water supply pipe 5... Outgoing water temperature sensor 6 ...Burner 9°°°WA"1,1 10...Water flow valve

Claims (1)

[Claims] The required amount of heat is calculated based on the detection signals of the flow rate sensor installed in the water supply pipe, the incoming water temperature sensor, and the hot water temperature sensor installed in the hot water supply pipe, and the combustion of the burner is automatically controlled. When the calculated required amount of heat exceeds the capacity of the water heater, a gas instantaneous water heater is equipped with a water flow pulp that reduces the flow rate, and hot water at a predetermined temperature is supplied from the water heater to discharge hot water at a set discharge temperature. A water supply device comprising a faucet, wherein when hot water supply is stopped in a throttled state, the water flow valve automatically returns to a fully open state after a predetermined period of time has elapsed after the water supply was stopped.