JPH0445003Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an instant hot water supply device that always provides hot water when the tap is opened.

[Prior art and its problems] In a water heater that uses an instantaneous water heater or a storage water heater, if there is a long pipe between the water heater and the hot water tap, the cold water in this long pipe will flow out first. Therefore, there is a problem that hot water cannot be obtained immediately when the tap is opened.

Therefore, as shown in Fig. 3, a hot water pot 3 that can be heated by an electric heating means 4 is installed in the piping 5 of the water heater 1 and hot water tap 2, and when the tap is opened, the hot water in the hot water pot 3 is first drawn out. At the same time, the cold water in the pipe 5 is mixed with the hot water in the hot water pot 3 to be softened before the hot water is discharged.

However, in the above-mentioned known example, it is necessary to keep the power supply of the electric heating means 4 in the hot water pot 3 in the ON state at all times, which is not preferable from the viewpoint of energy saving. Also, as mentioned above, hot water pot 3
There is also a way to constantly circulate hot water from the water heater 1 in the piping 5 instead of installing a hot water heater, but in this case, the equipment cost related to the circulation piping increases as well as the running cost. There's a problem.

Furthermore, a method is known in which a container filled with a hydrogen storage alloy is placed in the middle of the piping and heated by the occlusion and devolatilization effects of the hydrogen storage alloy (Japanese Patent Application Laid-open No. 1983-69353); in this case, Since the container is only attached to a part of the piping, there is a problem that hot water cannot be obtained as soon as the tap is opened, and the temperature in the part of the piping where the container is not attached progresses due to natural heat dissipation. be.

An object of the present invention is to provide an instant hot water supply device that can provide hot water almost as soon as the tap is opened, regardless of the distance of the piping connecting the water heater and the tap.

[Means to solve the problem] The configuration of the present invention is as follows.

Instant hot water supply consisting of a filling chamber filled with a hydrogen storage alloy that surrounds the entire hot water supply piping from the water heater to the hot water tap, and this hydrogen storage alloy filling chamber and the hydrogen reservoir are communicated through a communication pipe with a regulating valve. Device.

[Function] In the above-mentioned instant hot water supply device, when the hot water tap is turned off and the temperature of the hot water in the piping system begins to drop due to natural heat radiation, the temperature in the hydrogen storage alloy filling chamber,
The pressure decreased, and hydrogen commensurate with this decrease was stored in the hydrogen storage alloy in the hydrogen storage alloy filling chamber from the hydrogen reservoir via the communication pipe, causing an exothermic reaction, and this reaction heat began to cool down inside the pipe. Hot water is heated. As a result, hot water comes out immediately when the tap is opened. Then, when high-temperature water from the water heater side passes through the piping, devolatilization (endothermic reaction) of hydrogen occurs, and the devolatilized hydrogen returns to the hydrogen reservoir in a pressurized state via the communication pipe. The amount of hydrogen movement can be adjusted using a regulating valve.

[Embodiment and its operation] Fig. 1 shows an embodiment of the instant hot water supply device according to the present invention. 1 is a water heater, and this water heater 1 is an instantaneous heating type using gas as fuel. Reference numeral 2 denotes a tap to which hot water heated by the water heater 1 is supplied via piping 5.

Reference numeral 6 denotes a hydrogen storage alloy filling chamber installed so as to cover the entire outer periphery of the pipe 5 connecting the water heater 1 and the tap 2, and a hydrogen storage alloy (LaNi ₅ ) 7 is contained in this chamber in the case of the embodiment. Filled with 1.0Kg. 8 is a pipe 9 communicating with the inside of the hydrogen storage alloy filling chamber 6.
Hydrogen reservoir (geometric volume 12.5
), 10 is a needle valve (regulating valve) that can open and close the inside of the communication pipe 9.

Reference numeral 11 denotes a heat insulating material coated on the outer periphery of the hydrogen storage alloy filling chamber 6.

The pressure inside the hydrogen storage alloy filling chamber 6 and the hydrogen reservoir 8 is set to 10 Kg/cm ² G at 66°C.

Next, the operation of the above embodiment will be explained. The water heater 1 is operated to supply hot water at 66° C. to the tap 2 via the pipe 5. At this time, the pressure inside the hydrogen storage alloy filling chamber 6 and the hydrogen reservoir 8 is 10 Kg/cm ² G. When the tap 2 is closed in this state, the temperature of the 66°C hot water in the pipe 5 decreases due to natural heat radiation, and as a result, the hydrogen storage alloy 7 is cooled and the pressure in the hydrogen storage alloy filling chamber 6 decreases. Hydrogen is fed from inside the hydrogen reservoir 8 via the communication pipe 9, causing an occlusion effect and generating heat. This heat generation warms the hot water in the pipe 5.

FIG. 2 is a graph showing the change in hot water temperature after hot water supply is stopped in the above example, and □・ indicates that in the above example, the pressure inside the hydrogen reservoir 8 was 10 Kg/cm ² G at a room temperature of 20°C. The figure shows the temperature change when the hot water tap 2 is closed and the needle valve 10 is slightly opened.As the hot water in the pipe 5 cools, hydrogen is supplied from the hydrogen reservoir 8 to the hydrogen storage alloy filling chamber 6. The exothermic reaction at this time imparts heat to the hot water in the pipe 5, and the cooling rate of the hot water temperature is weakened as shown in the figure.

In addition, if the capacity of the hydrogen reservoir 8 is made large enough,
The water temperature can be maintained at approximately 66℃, but in reality, the hydrogen pressure in the hydrogen gas system decreases, so the water temperature can be maintained at approximately 66℃.
It will be kept at a lower temperature. If it is desired to maintain the hot water temperature for an even longer period of time, it is sufficient to use a hydrogen storage alloy and increase the amount of hydrogen accordingly.

Next, during hot water supply, when hot water at 66°C is passing through the pipe 5, the pressure in the hydrogen storage alloy filling chamber 6 and the hydrogen reservoir 8 is the equilibrium pressure of 66°C, that is, 10 Kg/cm ²
Return to G.

Next, the 〓 mark in FIG. 2 will be explained.

First, hot water at 66° C. is flowed through the pipe 5 at a room temperature of 20° C. When the pressure in the hydrogen reservoir 8 reaches 10 kg/cm ² G, hot water supply is stopped and the needle valve 10 is closed. After 30 minutes, the temperature of the hot water in pipe 5 is 30℃.
When the needle valve 10 is lowered to the vicinity, the needle valve 10 is slightly opened, and hydrogen gas is caused to flow from the hydrogen reservoir 8 into the hydrogen storage alloy filling chamber 6 to perform an occlusion action. The opening degree of the needle valve 10 is adjusted appropriately so that the water temperature in the pipe 5 is around 30°C. By operating in this way, the temperature will remain at 30℃ for 2.5 hours after the hot water supply is stopped.
water temperature can be maintained.

Next, when the needle valve 10 is fully opened and 66° C. hot water is passed through the pipe 5 for 10 minutes, the pressure inside the hydrogen reservoir 8 can be returned to 10 Kg/cm ² G.

[Effects of the present invention] As described above, the present invention installs a hydrogen-absorbing alloy filling chamber filled with a hydrogen-absorbing alloy throughout the hot water supply piping, and when the hot water temperature in the piping drops, the water temperature is maintained at a certain temperature by the occlusion effect. Alternatively, since the water cooling is delayed, no power supply is required, and the pipe is only made somewhat thicker by forming a hydrogen storage alloy filling chamber along the pipe. As a result, it is possible to obtain an instant hot water supply device that does not require running costs and takes up almost no space.

Next, the present invention is configured so that the movement of hydrogen can be adjusted by attaching a regulating valve to the communication pipe, so that the occlusion and devolatilization effects can be freely adjusted to provide instant hot water supply that meets the purpose. I can do it.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the instant hot water supply device according to the present invention, Figure 2 is an explanatory diagram of the action (temperature change) of the present invention, and Figure 3 is an explanatory diagram of the instant hot water supply device according to the present invention.
The figure is an explanatory diagram of a conventional instant hot water supply device. 1... Water heater, 2... Hot water tap, 3... Hot water pot, 4... Electric heating means, 5... Piping, 6... Hydrogen storage alloy filling chamber, 7... Hydrogen storage alloy, 8...
Hydrogen reservoir, 9...Communication pipe, 10...Needle valve.

Claims (1)

[Scope of utility model registration request] Instant hot water supply consisting of a filling chamber filled with a hydrogen storage alloy that surrounds the entire hot water supply piping from the water heater to the hot water tap, and this hydrogen storage alloy filling chamber and the hydrogen reservoir are communicated through a communication pipe with a regulating valve. Device.