JPH0134054Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heating device at the end of a hot water supply pipe for eliminating the delay in rising hot water temperature caused by the hot water supply pipe of an instant water heater.

Configuration of conventional example and its problems In the conventional central hot water system using large water heaters, as shown in Figure 1, one large water heater can handle two
~ Because hot water piping is installed in three locations, the piping length L is 2 to 3 m in short places and 8 to 3 m in long places.
It becomes more than 10m. FIG. 3 shows the rising temperature of hot water at the start of use of such piping in relation to the passage of time. Time t ₀ is the time during which water remaining in the pipe L minutes after turning on the terminal faucet flows, and time t ₁ is the time when the water heater is ignited at t ₀ and the water temperature is raised by the water heater itself. This is the addition of the so-called heating rate. Therefore, it takes t ₁ hour for the desired temperature of hot water to come out from the faucet after you turn it on.This time varies depending on the length of L, water temperature, air temperature, pipe material, etc., but generally it takes about 30 hours. It takes ~40 seconds, and during this time, you have to throw away the wasted water, and it requires a long waiting time, so even though it is an instantaneous water heater, it has the drawbacks of being extremely inconvenient.

Purpose of the invention This invention solves the above-mentioned drawbacks of the conventional method.It dramatically improves the rise of hot water immediately after the faucet is turned on by storing preheated hot water in a small tank and heater in front of the faucet and connecting it to a large water heater. The purpose is to

Composition of the Invention In order to achieve the above object, the water heater of the present invention includes a large water heater equipped with a running water switch, a gas valve linked to the running water switch, a hot water supply pipe connected to the large water heater, and a hot water supply pipe length. A small tank is provided with a capacity related to the length of the hot water supply pipe, and the small tank is equipped with a heater and a thermostat with a set temperature related to the length of the hot water supply pipe, and the small tank is provided immediately before the faucet. Hot water can be used almost as soon as the tap is opened, and it has the advantage of combining the advantages of central hot water supply with the advantages of immediate hot water supply.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is a large water heater. 2 is a hot water supply pipe, 3 is a faucet, and a small tank 4 is provided just in front of the faucet. A heater 5 is attached to the small tank 4, and a thermostat 6 is further provided to the small tank. Reference numeral 7 denotes a power source, forming an electric circuit including a heater 5 and a thermostat 6. L indicates the piping length. 8 is a flush water switch, and 9 is a gas valve interlocked with the flush water switch.

The operation of the above configuration will be explained below.

The capacity of the small tank 4 and the set temperature of the thermostat are appropriately determined according to the pipe length L, and the water in the small tank 4 is heated by a power source 7 and a heater 5. When the water temperature rises to the set temperature of the thermostat, the heater is temporarily turned off, and when the small tank cools down, the heater is turned on again, so that the small tank 4 is always maintained at a hot water temperature commensurate with the number of pipes L. When the faucet 3 is opened, water is in a running state, a large water heater detects running water by a running water switch 8, a gas valve 9 is opened, and the water heater is ignited. Hot water heated in a small tank comes out from the faucet 3 immediately when the tap is opened, and the hot water rises in a curve as shown at 10 in FIG. Since the water remaining in the pipe 2 flows into the small tank 4 one after another, the temperature of the water in the small tank 4 will drop slightly, so the temperature of the water coming out of the faucet 3 will decrease as shown at 10 in Figure 3. falls for T ₁ minute. Next, since the large water heater 1 is in the ignition state, after the time required for the heating speed of the large water heater 1 has elapsed, hot water at the temperature set by the large water heater 1 will sequentially flow into the small tank 4. The temperature of the water coming out of the faucet 3 rises again and finally converges at the water temperature T ₀ set in the large water heater 1.

As described above, according to the embodiment of the present invention, the conventional system in which sufficient water temperature could not be obtained at the faucet 3 until the time t ₁ shown in FIG. As shown in the figure, it has the effect of being able to instantly obtain hot water close to the temperature set by the large water heater. Note that even when hot water is used intermittently for short periods of time, hot water at the temperature T ₀ remains in the small tank 4, so hot water is immediately dispensed from the faucet 3.

Effects of the invention As described above, according to the invention, the following effects can be obtained.

(1) Hot water is available almost as soon as the faucet is opened. Convenient with no waiting time even in winter.

(2) After using the hot water in the tank, hot water from the large water heater can be used continuously, combining the advantages of central hot water supply and instant hot water.

(3) By preparing various small tank sizes and thermostat temperature settings according to the length of the piping, any piping conditions can be accommodated.

(4) It can use a household power source and requires only a small tank, so it requires less energy.

(5) Can also be used to prevent piping from freezing in winter.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing hot water temperature rise characteristics at a faucet in the conventional and an embodiment of the present invention. 1...Large water heater, 2...Hot water piping, 3...Faucet, 4...Small tank, 5...Heater, 6...Thermostat, 8...Water switch, 9...Gas valve.

Claims (1)

[Scope of utility model registration request] A large water heater equipped with a running water switch, a gas valve linked to the running water switch, a hot water supply pipe connected to the large water heater, and a small tank having a capacity related to the length of the hot water supply pipe are provided. The water heater has a heater and a thermostat with a set temperature related to the length of the hot water supply piping in the tank, and the small tank is provided near a faucet.