JPH025303Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a stop-type water heater in which a faucet is placed on the primary side of a hot water storage tank to control the discharge of hot water in the tank. The aim is to prevent natural outflow due to increased internal tank pressure.

[Conventional technology]

A hot water storage tank of a conventional stop-off type water heater is as shown in FIG. 5, for example. As shown in the figure, a heating device 2 is installed inside the hot water storage tank 1.
The interior is kept at a predetermined temperature with hot water. and,
By controlling the opening and closing of the faucet 3, the hot water storage tank 1 is adjusted to the amount of water that has flowed into the hot water storage tank 1 from the water supply pipe 4.
The hot water inside is discharged from a hot water conduit 5 and a hot water supply port 6.

Therefore, the temperature of the water replenished into the hot water storage tank 1 is in a relatively low state. Therefore, when the make-up water that has flowed in at a low temperature is heated to a predetermined temperature, the volume of the hot water in the hot water storage tank 1 expands. In this type of stop-start water heater, the volume-expanded hot water drips from the guide pipe 5 because the tip of the hot water pipe 5 is open to the atmosphere.
However, if left in this state, drops would drip from the hot water supply port 6, which could be mistaken for a water stoppage failure. The expanded hot water is taken out through this small hole. Then, it is discharged through the funnel 7 and the drain pipe 8 into the bowl of the washbasin 9, etc. In addition, when using normal hot water, a large amount of hot water flows out from the tip side of the hot water conduit 5 to the hot water supply port 6, and only a small amount of hot water leaks out from the small hole for discharging expanded water, making it impossible to use. It is not something that can be supported.

[Problem that the invention attempts to solve]

However, in the conventional method for discharging expanded water, special faucet fittings such as a funnel 7 and a drain pipe 8 are required. Another disadvantage is that the inner surface of the bowl of the washbasin 9 becomes dirty with the discharged expanded water.

[Means for solving the above problems]

The present invention has been developed to improve and eliminate the above-mentioned conventional problems, and to prevent the discharge of expanded cedar by providing a capacity regulator that changes the capacity according to the volumetric expansion of the hot water in the tank. The purpose is to provide a hot water storage tank for a stop-off type water heater.

Therefore, the means of the present invention for solving the above-mentioned problems is to arrange a faucet on the primary side of the hot water storage tank, and open and close the faucet to adjust the amount of water flowing into the hot water storage tank according to the amount of water flowing into the hot water storage tank. In a hot water storage tank for a stop-off type water heater in which hot water is discharged from the flush, a capacity regulator with a built-in piston is connected to the water supply side of the hot water storage tank, and the piston is biased with a bidirectional shape memory alloy. By doing so, the piston is controlled in two positions depending on the temperature of the hot water in the hot water storage tank.

[Effect]

As is clear from the embodiments shown in FIGS. 1 to 4, when the make-up water supplied into the hot water storage tank 11 is heated to a predetermined temperature or higher and expands in volume, the hot water storage tank 11
The bidirectional shape memory alloy 21 of the capacity regulator 12 installed between the water supply port 13 and the faucet 17 senses the temperature of the make-up water and protrudes (see Fig. 4). Increase the capacity within 12. The chamber 23 in this capacity regulator 12 is located in the hot water storage tank 11.
Therefore, the volumetric expansion of the make-up water is absorbed by the increased capacity of this chamber 23, and the expanded water is not discharged from the hot water supply port 24 or the like.

〔Example〕

The configuration of the present invention will be described below with reference to the drawings based on an embodiment in which the present invention is attached to a washbasin.

Fig. 1 is a block diagram showing the entire hot water storage tank 11 for a water heater according to an embodiment of the present invention, Fig. 2 is an overall perspective view of the hot water storage tank 11 installed in a washbasin 27, and Fig. 3 is a normal use. Fig. 4 is a longitudinal sectional view of the capacity regulator 12 when the make-up water in the hot water storage tank 11 has risen to a predetermined temperature or higher when not in use.
As shown in the figure, the capacity regulator 12 has a small diameter cylindrical portion 14 screwed onto the water supply port 13 of the hot water storage tank 11 . A hot water storage tank 1 is provided on the tip side of the small diameter cylindrical portion 14.
An outflow port 15 communicating with the inside of the cylinder 1 is bored, and a large diameter cylindrical part 16 is provided on the opposite side of the small diameter cylindrical part 14. An inlet 18 that communicates with the faucet 17 near the large-diameter cylindrical portion 16 of the small-diameter cylindrical portion 14
is provided. Inside the large diameter cylindrical portion 16,
A piston 20 is mounted, which is urged to the left in FIG. 3 by a spring 19. With this piston 20, the inside of the large diameter cylindrical part 16 is
It is divided into a chamber 23 that communicates with the inside, and a chamber 25 that communicates with the atmosphere through a small hole 26. The piston 20 is also connected to a bidirectional shape memory alloy 21 mounted within the small diameter cylindrical portion 14 . The shape memory alloy 21 is set to expand when it senses a temperature above a predetermined temperature, and to contract when it senses a temperature below a predetermined temperature. In addition, in FIGS. 1 and 2, 22 is a water discharge pipe attached to the washbasin 27, and 24 is a hot water supply port.

Next, the operation mode of the hot water storage tank 11 configured as described above will be explained.

First, a usage state in which hot water is continuously discharged will be described. The faucet 17 is held in an open state, and makeup water is supplied into the hot water storage tank 11. The make-up water rises in the hot water storage tank 11 in a layered manner, and the hot water in the upper layer of the tank, which is heated to a predetermined temperature by a heating device (not shown) in the tank, increases the amount of make-up water that flows into the tank. The amount of hot water is discharged from the hot water supply port 24 of the water discharge pipe 22. Then, when the use of hot water is finished, the faucet 17 is closed. on the other hand,
In the hot water storage tank 11, the makeup water is heated by a heating device equipped with a thermostat. As the make-up water is heated, it continues to expand in volume. When the make-up water temperature exceeds a predetermined temperature, such as 35°C, the bidirectional shape memory alloy 21 senses this, and the shape memory alloy 21 instantly stretches as shown in Figure 4 to adjust the capacity. The capacity of chamber 23 within vessel 12 is increased. This chamber 23 is the hot water storage tank 11
As a result, the capacity of the hot water storage tank 11 increases by the amount that the capacity of the chamber 23 increases due to the expansion operation of the shape memory alloy 21. Therefore, if the amount of change in the volume of the chamber 23 before and after the expansion operation of the shape memory alloy 21 is set to be equal to or greater than the volumetric expansion of the make-up water in the hot water storage tank 11, the expanded water can be There is never dripping or leakage from the hot water supply port 24 of the hot water supply pipe 22. For example, in 13 hot water storage tanks 11, 20
When water was placed in the tank and heated to 85°C, the volume expanded by 400 c.c. For this reason, according to the experimental results in which the shape memory alloy 21, which is stretched at approximately 35° C., was used and the volume change of the chamber 23 after stretching was set to 400 c.c., there was no dripping or leakage of expanded water at all.

After the stretching operation, the shape memory alloy 21 maintains its state because the temperature of the hot water in the hot water storage tank 11 is maintained at a predetermined temperature of, for example, 85°C. Then, when the next hot water is used, after the shape memory alloy 21 senses the temperature of the make-up water, which is cold water, the shape memory alloy 21 performs a shrinking operation and enters the state shown in FIG. 3. Therefore, it is best to install the shape memory alloy 21 in a position close to a heating device that can sensitively sense the temperature of the hot water in the tank and can perform an expansion operation before the hot water in the tank undergoes a large volumetric expansion.

By the way, the present invention is not limited to the above embodiment, and the shape of the capacitance regulator 12, the type and shape of the shape memory alloy 21, etc. can be changed as appropriate.

[Effect of idea]

As explained above, in the present invention, expanded water in the hot water storage tank of a stop-off type water heater can be accommodated by changing the capacity of the capacity regulator using a shape memory alloy, and the water supply pipes etc. The expanded water never leaks from the hot water inlet. For this reason,
There is no need to worry about the inner surface of a basin, such as a washbasin, becoming dirty due to dripping expanded water.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, with Figure 1 being an overall schematic block diagram, and Figure 2 being
The figure is a partial cross-sectional perspective view showing the hot water storage tank installed in the washbasin, Figure 3 is a vertical cross-sectional view of the capacity regulator showing the state before the shape memory alloy is stretched, and Figure 4 is after the same stretching operation. FIG. 5 is a longitudinal sectional view of a conventional hot water storage tank. 11...Hot water tank, 17...Water faucet, 12...
Capacity regulator, 20... Piston, 21... Shape memory alloy.

Claims (1)

[Scope of utility model registration request] A water faucet is arranged on the primary side of the hot water storage tank, and by opening and closing the faucet, hot water in the hot water storage tank is discharged from the flush according to the amount of water flowing into the hot water storage tank. In the hot water storage tank, a capacity regulator with a built-in piston is connected to the water supply side of the hot water storage tank, and the piston is biased with a two-way shape memory alloy to adjust the piston to two positions depending on the temperature of the hot water in the hot water storage tank. A hot water storage tank for a stop-off type water heater characterized by being controlled.