JPH0452456A - Heating-promoting mechanism for instantaneous electric water heater of water-storage type - Google Patents

Abstract

PURPOSE:To shorten the time at which the whole of water is boiled up by heating without rest at the last process of boiling up, by providing a heating-promoting valve whereby a part of a heating device or a part of a water-guiding pipe is opened when a temperature of the water filled above the vicinity of the heating device at the inside of a water-storage tank rises at a definite value or higher. CONSTITUTION:Just before the whole quantity of water is boiled up, that is, when hot-water is stored to the vicinity of the lower end of a water-guiding pipe 10 (shown as a mark G), and the rest of the water (including warm-water) is left around the vicinity of a heating device 4, (in other words, when at the inside of a water-storage tank 1, the hot-water is filled above the vicinity of the heating device 4), water temperature inside/outside the heating device 4 is detected, and a heating-promoting valve 25 is operated. As a result, the inside of the heating device 4 communicates with the outside thereof and the water is circulated by convection, as shown by arrow marks 'a', and the water inside the heating device 4 and at the periphery thereof is heated without rest. In such a way, the whole amount of water in the water-storage tank 1 is effectively boiled up, ranging from the beginning to the endl.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heating promotion mechanism for an instant heat storage type electric water heater. More specifically, the present invention relates to a heating acceleration mechanism for an instant hot water storage type electric water heater that can rapidly heat water in a tank and take out hot water in a short time.

[Prior art] In a typical electric water heater, the hot water heated by the heater rises, and the force water moves downward, and this convection is repeated to gradually increase the temperature of the water. It has become.

However, since this general electric water heater heats the entire water in the hot water storage tank to a predetermined temperature, there is a problem in that when the hot water runs out, hot water at the desired temperature cannot be quickly drawn out.

However, in recent life, people have become accustomed to using hot water regardless of the time of day, and the amount of hot water used has also increased, and the uses for hot water have expanded to include shampooing, bathing, washing the face, and washing dishes.
The desire to use hot water immediately, like "daytime shampoo," is growing stronger. In view of these circumstances, the present inventor developed an electric water heater (Heisei 2 The company is already offering an instant-heat hot water storage type electric water heater (patent application filed on June 7, 2017).

As shown in FIG. 13, this electric water heater includes a heating mortar 4 disposed at the bottom of a hot water storage tank 1, a heater 5 disposed inside the heating mortar 4, and a A hot water pipe 1 that sends heated hot water to the top of the hot water storage tank 1
0 and a temperature sensing on-off valve 11 interposed in the middle of the hot water supply pipe 10, the on-off valve 11 opens when the hot water in the heating mortar 4 reaches a predetermined temperature or higher, and when the hot water in the heating mortar 4 reaches a predetermined temperature or lower. It is configured to close when the

According to this electric water heater, since only the water in the heating mortar 4 is heated by the heater 5, the temperature of the water in the heating mortar 4 can be increased in a very short time. In this case, the temperature sensing on-off valve 11 is closed until the water temperature reaches a predetermined temperature, so the hot water in the heating mortar 4 passes through the hot water pipe 10 and into the hot water storage tank 1 while the hot water temperature does not rise sufficiently. Never move to.

Therefore, the water in the heating mortar 4 can be reliably heated to hot water.

When the hot water reaches a predetermined temperature, the on-off valve 11 opens, and the hot water in the heating mortar 4 is guided to the upper part of the hot water storage tank 1 through the hot water pipe 10.

Since this hot water has a large temperature difference and density difference (specific gravity difference) from the water in the tank 1, it is stored in the upper part 1 of the hot water storage tank in a separated state without being mixed with water.

After the hot water rises in the hot water pipe 10, the water enters the heating mill 4, so the on-off valve 11 is closed again. and,
The water in the heating mortar 4 is heated by the heater 5 until it becomes hot water. From then on, repeat this process until the entire amount of water is boiled.

According to this invention, if the water in the heating can 4 is boiled first, then the hot water can be taken out, so hot water can be dispensed in a very short time.

[Problems to be Solved by the Invention] In the above-mentioned electric water heater, just before the entire amount of hot water is boiled, that is, the hot water is stored up to the vicinity of the lower end of the hot water pipe 10, and the water (including low-temperature water) is heated to the heating mill 4. When the hot water only remains near the heating mill 4 (in other words, when the upper part of the hot water storage tank 1 is filled with hot water from the vicinity of the heating mill 4), the convection between the inside and outside of the heating mill 4 is slow. Therefore, the temperature of the water in the heating mortar 4 remains high and does not drop, so the on-off valve 11 is kept open.

Therefore, the convection between the hot water heated inside the heating mortar 4 and the water outside the heating mortar 4 continues, albeit slowly, and eventually the inside of the hot water storage tank 1 is boiled to its full capacity. Become.

However, if the convection at this time can be made active, it will be convenient because it will be possible to quickly boil up the entire amount of hot water.

In view of such circumstances, an object of the present invention is to provide a heating acceleration mechanism for an instant-heat hot water storage type electric water heater that can shorten the time required to boil the entire amount of water by heating the water all at once at the end of boiling. .

[Means for Solving the Problems] The heating promotion mechanism of the instant-heat hot water storage type electric water heater of the present invention includes (a) a heating mortar disposed at the bottom of the hot water storage tank; (b)
a heater disposed inside the heating mill; (c) a hot water guide pipe that transports hot water heated from the top of the heating mill to the top of the hot water storage tank; and (d) a heater disposed in the middle of the hot water guide pipe. The electric water heater is equipped with a temperature-sensing on-off valve that opens when the hot water in the heating can reaches a predetermined temperature or higher and closes when the hot water in the heating can reaches a predetermined temperature or lower, and includes (e) a hot water storage tank interior; The method is characterized by being equipped with a heating acceleration valve that opens a part of the heating mortar or a part of the hot water pipe when the hot water filled above the vicinity of the heating mortar reaches a predetermined temperature or higher. The heating can as used herein refers to a tank or container-like structure that does not include a heater disposed inside and prevents water or hot water from moving outside when heated.

In addition, temperature-sensing on-off valves open and close by sensing temperature.
This concept includes all types of on-off valves.

Further, the heating promotion valve may be an on-off valve of any type or structure as long as it has the function of opening a part of the heating can or a part of the hot water pipe.

[Function] Also in the present invention, just before the entire amount of hot water is boiled, that is, when the hot water is stored near the lower end of the hot water pipe and only water (including low temperature water) remains near the heating can (in other words Therefore, when the hot water storage tank is filled with hot water above the vicinity of the heating can, the convection between the inside and outside of the heating can becomes slow, and the water temperature inside the heating can remains high. Since the voltage does not drop, the on-off valve remains open.

However, if the heating promotion valve is opened in this state, the inside and outside of the heating can are communicated with each other, and the water in the vicinity of the heating can begins to actively convect, thereby completing heating at once.

[Example code] Next, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a hot water storage tank, the outer periphery of which is covered with a heat insulating material 2, and housed in an outer panel 3.

A heating can 4 is arranged at the bottom of the hot water storage tank 1. This heating can 4 is a generally dome-shaped or box-shaped member,
The lower surface is completely open, and the top surface is formed with an opening for connecting a molten metal pipe 10, which will be described later. A heater 5 is arranged inside the heating can 4.

Reference numeral 10 denotes a hot water supply pipe, the lower surface of which is connected to the top of the heating can 4 and communicating with the inside of the heating can 4.

Further, its upper end is open above the hot water storage tank 1.

A temperature sensing on-off valve 11 is installed in the middle of the hot water pipe 10, in this embodiment at the bottom. The on-off valve 11 may be any on-off valve as long as it opens when the internal temperature of the heating can 4 reaches a predetermined temperature and closes when the temperature drops below the predetermined temperature. An on-off valve 11 using a shape memory alloy plate is attached. That is, when the shape memory alloy senses a high temperature, it opens as shown by the dotted line, and when it senses a low temperature, it closes as shown by the solid line.

25 is a heating acceleration valve, which is provided in a part of the heating can 4. The heating promotion valve 25 is a valve that opens by sensing the temperature of water outside or inside the heating can 4 when hot water is stored above the heating can 4.

In FIG. 1, 12 is a water supply shielding plate, 13 is a water supply pipe, 14 is a pressure reducing valve connected to a water pipe, etc., 15 is a hot water sampling pipe, and 16 is a hot water tap. Furthermore, although not shown, a thermostat, an earth leakage breaker, and the like are appropriately installed.

Next, the operation of the above embodiment will be explained.

First, water is poured into the hot water storage tank 1 from the water supply pipe 13, and the heater 5 is energized. At this time, the water temperature inside the heating can 4 is low, so the on-off valve 11 is closed. Therefore, only the water in the heating can 4 is heated and boiled to boiling water in a very short time. When the hot water reaches a predetermined temperature, the on-off valve 11 senses the high temperature and opens, so that the hot water in the heating can 4 rises through the hot water pipe 10. And, with an opening at the upper end of the hot water pipe 10,
You can save up nearby. This state is indicated by the symbol A.

When the hot water rises in this way, water also enters the heating can 4 at the same time. When water enters, the on-off valve 11 senses the low temperature and closes, so that only the water in the heating can 4 is heated by the heater 5. From then on, as the temperature inside the heating can 4 rises, the on-off valve 11 repeats opening and closing intermittently, so the amount of hot water that accumulates increases sequentially as shown by symbols A1B and CSD, and eventually the hot water is stored in the hot water storage tank. It will store 1-cup of hot water.

Then, just before the entire amount of hot water is boiled, that is, when the hot water is stored near the lower end of the hot water pipe IO (indicated by the symbol G) and only water (including low-temperature water) remains near the heating can 4 ( In other words, in the hot water storage tank 1, the heating can 4
When the upper part is filled with hot water), the heating acceleration valve 25 is opened in response to the temperature of the water inside and outside the heating can 4.

As a result, when the inside and outside of the heating can 4 are communicated with each other, convection as shown by arrow a becomes possible, and the water inside and around the outside of the heating can 4 is heated all at once.

In this manner, in this embodiment, the entire amount of water in the hot water storage tank 1 is efficiently boiled to the end.

Next, other embodiments other than the above will be described.

In the embodiment shown in FIG. 2, the heating can 4 has a heat insulating structure. To create a heat insulating structure, for example, a heat insulating material such as silicone rubber may be attached to the outside of the heating can 4. When the heat-insulating structure is adopted as in this embodiment, the heating acceleration valve 25 has a shape memory alloy plate 26 pasted on its outside (the side where the heater 5 is not placed), as shown in FIG. The temperature can be sensed from this surface.

In an embodiment in which the heating can 4 does not have a heat insulating structure, the heating accelerator valve 25 senses the temperature inside and outside the heating can 4 at the same time, so in this case, the heating accelerator valve 25 senses the temperature higher than the temperature sensed by the temperature sensing on/off valve 11. Must be set to . This is because after the temperature-sensing on-off valve 11 is in the open state, the temperature-sensing on-off valve 1
This is because it is higher than the sensing temperature of No. 1.

The mounting position of the heating promotion valve 25, that is, the opening position of the heating can 4 and the hot water pipe 10 can be freely selected as shown in the following figures.

In the embodiment shown in FIG. 4, the upper part of the heating can 4 is opened at two places. Note that it is also possible to open at three or more locations. In the embodiment shown in FIG. 5, the lower part of the heating can 4 is opened.

In the embodiment shown in FIG. 6, a part of the molten metal pipe 10 is opened. As in this embodiment, when a part of the hot water supply pipe 10 is opened, convection occurs between the inside and outside of the heating can 4, so that heating of the lower part of the hot water storage tank 1 is further promoted. In this embodiment, since the hot water supply pipe 1O has a heat insulating structure, the heating acceleration valve 25 is made of a shape memory alloy plate or the like on the outside of the hot water supply pipe 10 (the side facing the wall of the hot water storage tank 1). , the temperature may be sensed on this surface.

There are various variations in the installation locations of the heating acceleration valves 25 when opening the hot water supply pipe 10. For example, as shown in FIG. Also, as shown in Figure 8, the temperature sensing on-off valve 1
They may be provided at two or more locations opposite the temperature sensing on-off valve 11, or at two or more locations below the temperature sensing on-off valve 11 as shown in FIG.

In the embodiments shown in FIGS. 7 to 9, the hot water supply pipe 10 has a heat-insulated structure, but if the heat-insulating structure is not used, the heating acceleration valve 25 would sense a temperature higher than the temperature detected by the temperature-sensing shut-off valve 11. Just set it. The reason is as described above.

The temperature sensing structure used in the heating acceleration valve 25 may be one using a shape memory alloy plate 26 as shown in FIG. 3, or one using a shape memory alloy spring 27 as shown in FIG. It may be. Furthermore, the 11th to 1st
A shape memory alloy wire 28 as shown in FIG.
A heat insulating plate may be fixed in between. In this example, the two legs detect the heat and bend, causing the hot water pipe 1 to
0 openings can be opened and closed.

In addition to the above, the temperature sensing mechanism of the heating accelerator valve 25 is a mechanism that uses bimetal or a mechanism that combines a solenoid valve (or electric valve) and a thermostat. Any device may be used as long as it can open and close the hot water pipe 10.

Although various embodiments have been described above, the present invention may appropriately adopt modifications other than those described above without departing from the gist thereof.

[Effects of the Invention] According to the present invention, it is possible to boil a certain amount of water to hot water in a short period of time, and to immediately dispense hot water at a desired temperature even after the hot water has run out.

Furthermore, according to the present invention, the final boiling can be performed quickly, so the entire amount of water in the hot water storage tank can be efficiently boiled in a short time.

5: 10: 11: 25: heater hot water pipe Temperature sensing on/off valve Heating promotion valve

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an instant heat storage type electric water heater according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing another example of mounting the heating acceleration valve 25, and FIG. 3 is a heating acceleration valve 25. 25 is an enlarged view showing an example of the heating acceleration valve 25, FIGS. 4 to 9 are explanatory views showing other embodiments, FIGS. 13 is a cross-sectional view taken along the line XX in the figure, and FIG. 13 is a cross-sectional view of an instant heat hot water storage type electric water heater according to the basic invention of the present invention. (Main symbols in the drawing) 1: Hot water storage tank 4: Heating can

Claims (1)

[Claims] 1(a) A heating can disposed at the bottom of a hot water storage tank; (b)
) a heater disposed inside the heating can; (c) a hot water pipe that transports hot water heated from the top of the heating can to the top of the hot water storage tank; and (d) an intervening part in the middle of the hot water pipe. An electric water heater equipped with a temperature-sensing on-off valve that opens when the hot water in the heating can reaches a predetermined temperature or higher and closes when the hot water in the heating can reaches a predetermined temperature or lower, (e) a hot water storage tank; A heating accelerator valve is provided which opens a part of the heating can or a part of the hot water pipe when the hot water filled in the area above the vicinity of the heating can reaches a predetermined temperature or higher. Heating promotion mechanism of thermal hot water storage type electric water heater.