JPH04103955A - Fast-heating hot-water storage type electric water heater - Google Patents

Abstract

PURPOSE:To instantaneously supply hot-water with desired temperature even after the shortage of the hot-water, by a method wherein an open-or-closed valve opens when water in a heating kettle or in a hot water-guiding pipe is heated at a definite temperature, and closes when the water temperature falls at another definite temperature. CONSTITUTION:An open-or-closed valve 11 is installed on a part of a side wall 4b of a heating kettle 4, and is opened when the internal temperature in the heating kettle 4 or in a hot water-guiding pipe 10 reaches a definite temperature, and is closed when the internal temperature falls to another definite temperature and under. In this case, a thermal sensor such as a thermistor, which is installed in the heating kettle 4 or in the hot water-guiding pipe 10, is combined with an drive part such as a solenoid, which actuates the valve member of the open-or-closed valve 11. Therefore, when the thermal sensor senses that the temperature in the heating kettle 4 or in the hot water-guiding pipe 10 becomes high, the valve opens as shown with a dotted line, and when the thermal sensor senses a low temperature, the valve closes as shown with a solid line. When the valve 11 opens, the water around the heating kettle 4, i.e., at the bottom part of a water storage tank 1, flows into the heating kettle 4 and when the valve 11 closes, the water does not flow into the heating kettle.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an instant heat storage type electric water heater.

More specifically, the present invention relates to an instant heat 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, a heater heats water in a hot water storage tank to boil the water, and while the hot water rises, the water moves downward, and this convection is not repeated. The temperature of the water is gradually increased.

However, since this general water heater gradually boils all of the water in the hot water storage tank, there is a problem in that when the hot water runs out, hot water at the desired temperature cannot be quickly drawn out.

Therefore, an instant heat type electric water heater (Special Publick Publication No. 50-18625
(see Japanese Patent Publication No. 1) was proposed, but it was constructed as shown in Fig. 17. 50 is a hot water storage tank,
A molten metal pipe 51 is vertically arranged inside it. A heater 52 is provided at the bottom of the hot water pipe 51. 53 is a water supply pipe, 54 is a water supply impermeable plate, and 55 is a hot water sampling pipe.

This electric water heater was designed to rapidly obtain hot water by heating only the hot water inside the hot water pipe 51.

[Problems to be Solved by the Invention] However, the conventional water heater was not able to rapidly obtain hot water as expected.

This is because the water heated by the heater 52 rises in the hot water supply pipe 51 and goes up into the hot water storage tank 5 with just a slight increase in temperature.
This is because hot water could not be stored near the hot water supply port 56 because it would mix with the water inside the hot water supply port 56. Furthermore, there is a problem in that even though the water temperature in the hot water storage tank does not rise sufficiently in the end, only the water in the hot water guide pipe 51 boils, making it impossible to raise the temperature of the entire hot water storage tank.

However, in recent life, we have become accustomed to using hot water regardless of the time, and the amount of hot water used has increased, and the use of the place has expanded to include jumping, bathing, washing the toilet, and washing dishes.
The desire to use the hot water immediately is becoming stronger, as is often called "daytime bathing."

In view of these circumstances, the present invention provides an instant heating hot water storage system that reliably boils water in small amounts to hot water, thereby making it possible to dispense hot water at a desired temperature in a very short time even after the hot water has run out. The purpose is to provide a model electric water heater.

[Means for Solving the Problems] The instant heating hot water storage type electric water heater of the present invention comprises a heating can that is arranged at the bottom of a hot water storage tank and partitioned by a partition wall that prevents water from flowing into the bottom of the hot water storage tank. , a heater disposed inside the heating can; a hot water pipe for transporting heated hot water from the top of the heating can to the top of the hot water storage tank; and a hot water pipe for allowing water from the bottom of the hot water storage tank to flow into the heating can. and an on-off valve that opens and closes to prevent hot water from falling, and the on-off valve opens when the hot water in the heating can or the hot water pipe reaches a predetermined temperature and closes when the temperature drops below a predetermined temperature. Features.

Note that the term "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 being moved to the outside when heated.

[Function] According to the present invention, since a small amount of water in the heating can is first heated by the heater, the temperature of the water in the heating can can be increased in a very short time. Since the on-off valve is closed until the water temperature reaches a predetermined temperature, water around the heating can does not flow into the heating can. That is, since there is no convection of water inside and outside the heating can, only the water inside the heating can can be boiled quickly (to boiling water).

When the hot water reaches a predetermined temperature, the on-off valve opens, allowing water to flow inside and outside the heating can. In this state, the temperature difference between the hot water and the water in the tank is large, and the density (
Since the specific gravity (specific gravity) is small, it moves to the upper part of the hot water storage tank through the hot water guide pipe, and on the other hand, the water in the hot water storage tank flows into the heating can. Then, the temperature of the hot water in the heating can and the hot water pipe decreases, so the on-off valve is closed again. The water in the heating can is then heated again by the heater until it becomes boiling water. From then on, repeat this process until the entire amount of water in the hot water storage tank is boiled to boiling water.

According to the present invention, if the water in the heating can is boiled first, even a small amount of hot water can be immediately taken out, so the problem of dispensing hot water in a short time can be achieved.

[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. The heating can 4 is generally a dome-shaped or container-shaped member, and is partitioned by a partition wall 4b constituting it so that surrounding water is prevented from flowing freely.

A heater 5 is arranged inside this heating mill 4.

As shown in FIG. 2, the heater 5 is constructed by inserting a nichrome wire 7, which is an electrical resistance heating element, into a copper or stainless steel vibro chamber filled with an insulating material 9, and connecting a lead wire 8 thereto.

In addition, the part surrounded by the chain line in FIG. 2, that is, the part where the nichrome wire 7 is arranged, is called the main heater section 5.
This is the part that originally generates heat.

The vibro parts that do not belong to this main heater part 5i may also have heat, but this part is the main heater part 5! The temperature only increases due to the conduction heat from the

In FIG. 1, reference numeral 10 denotes a molten metal pipe, the lower end of which is connected to the top of the heating mill 4 and communicates with the interior of the heating mill 4.

Further, its upper end is open at the upper part of the hot water storage tank 1.

An on-off valve 11 is attached to a part of the partition wall 4b of the heating mill 4. This on-off valve 11 is connected to the heating mill 4 or the hot water pipe 10.
The valve opens when the internal temperature reaches a predetermined temperature, and closes when the temperature drops below the predetermined temperature. That is, a combination of a temperature sensor such as a thermistor attached to the heating mill 4 or the hot water pipe 10 and a drive unit such as a solenoid that opens and closes the valve body of the on-off valve 11 is used. Therefore, the temperature sensor is inside the heating mill 4 or the hot water pipe l.
When a high temperature inside O is detected, it opens as shown by the dotted line, and when a low temperature is detected, it closes as shown by a solid line. When the on-off valve 11 is opened, water around the heating mill 4, that is, at the bottom of the hot water storage tank 1, flows into the heating mill 4, and when the on-off valve 11 is closed, water is prevented from flowing into the heating mill 4.

Note that the mounting position of the on-off valve 11 is preferably below the heater 5. In this case, when water flows in from around the heating mill 4, it does not mix with the hot water above the heater 5, so the temperature of the boiled water does not drop.

In FIG. 1, I2 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 after the water is fully stored in the hot water storage tank 1, the heating mortar 4, and the hot water supply pipe 10, the heater 5 is energized. At this time, the water temperature inside the heating mill 4 is low, so the on-off valve 11 is closed.

Therefore, only the water in the heating mortar 4 is heated and boiled to boiling water in a very short time. Heating mortar 4 or hot water pipe l.

When the hot water inside reaches a predetermined temperature, the on-off valve 11 opens, so that the hot water inside the heating mill 4 rises through the hot water pipe lO, while surrounding water flows from the on-off valve 11 into the heating mill 4. It's coming in. The hot water that has risen through the hot water pipe 10 is then stored in the hot water storage tank 1.
It is stored near the top of the inside. This state is indicated by the symbol A.

On the other hand, the temperature of the hot water (water temperature) in the heating mortar 4 and the hot water pipe 10 into which the water has flowed decreases, so the on-off valve II closes. Therefore, only the water in the heating mill 4 is heated by the heater 5. Thereafter, as the temperature in the heating mortar 4 and the hot water supply pipe 10 rises, the on-off valve 11 repeats opening and closing intermittently, so the amount of hot water accumulated is increased sequentially as shown by symbols A1B, C, and D. Eventually, you will end up storing one cup of hot water in your hot water storage tank.

In addition, just before the entire amount of hot water is boiled, that is, the hot water is stored near the lower end of the hot water pipe 10, and the water (including low-temperature water) is
remains only around the heating mill 4 (in other words,
When the hot water storage tank 1 is filled with hot water above the vicinity of the heating mortar 4, the on-off valve 11 remains open because both the heating mortar 4 and the hot water pipe 10 are at high temperatures. kept in condition. Then, water inside and outside the heating mill 4 convects through the on-off valve 11, so that the water inside and around the heating mill 4 is heated all at once. In this way, the entire amount of water in the hot water storage tank 1 can be efficiently boiled to the end.

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

Although the water supply port 17 was provided on the bottom surface of the hot water storage tank 1 in the above embodiment, it may be provided on the side of the hot water storage tank 1 as shown in FIG. 3, or on the top of the hot water storage tank 1 as shown in FIG. It may also be provided. In this case, a water supply pipe 18 is installed inside the hot water storage tank 1, and water is supplied from the water supply port 17 to the tank 1.
It is best to lead it to the bottom.

Furthermore, in the embodiment shown in FIG. 1, the water supply shield plate 12 is attached near the water supply port 17, but this may not be provided depending on the location of the water supply port.

The mounting position of the heater 5 is the hot water storage tank 1 in the above embodiment.
As shown in Figure 5,
The heating can 4 may be mounted sideways within the tank 1, and the heater 5 may be inserted directly into the heating can 4 from the side of the tank 1.

The heating can 4 may be provided inside the hot water storage tank 1 as in the previous embodiment, or may be additionally attached to the outside of the hot water storage tank 1, ie, at the bottom, as shown in FIG. Further, as shown in FIGS. 9 and 10, a separate heating can 4 may be attached separately from the bottom of the hot water storage tank 1. The term "disposed at the bottom of the hot water storage tank" as used in the claims includes this type of separation. In the embodiment shown in FIG. 6, the water supply pipe 1 whose upper end is open at the bottom of the hot water storage tank 1 is
8 is provided vertically within the heating can 4, and water supplied from a water supply port 17 and stored at the bottom of the hot water storage tank 1 is guided into the heating can 4 through a water supply pipe 18.

The installation form of the on-off valve 11 may be such that it opens and closes a part of the partition wall 4b of the heating can 4 as shown in FIG. Water pipe 2
It may be attached to one end of 4 so that it can be opened and closed. Also the 8th
As shown in the figure, take only the water pipe 24 out of the hot water storage tank 1,
An on-off valve 11 may be interposed in the middle of the water conduit pipe 24.

Furthermore, if the heating can 4 is separate as shown in FIGS. 9 and 10, an on-off valve 11 may be interposed in the middle of the water conduit 24 connecting the heating can 4 and the hot water storage tank 1. good.

Temperature sensing for the opening/closing operation of the opening/closing valve 11 is performed by the heater 5.
However, the temperature sensing location and the type and structure of the on-off valve 11 can take the following forms.

In the example shown in FIG. 11, a shape memory alloy spring is used to open and close the on-off valve 11. In this example, valve body 2
1 is attached to the heating can 4 by a pin connection or the like so that it can be opened and closed freely, and the valve body 21 and the appropriate position of the heating can 4 are connected by a spring 19 made of a shape memory alloy. And spring 19
When the valve body 21 senses high temperature and contracts, the valve body 21 moves in the direction of arrow a and opens. Therefore, when the water is boiled in the heating can 4, the on-off valve 11 is opened and the heating can 4 is heated.
Water will flow in from outside. When the spring 19 comes into contact with water flowing in from the outside of the heating can 4 and senses a low temperature, it expands, and the tension spring 25 moves the valve body 21 in the closing direction, and it hits the stopper 26 and is stopped at the closed position. A shape memory alloy spring 19 is installed above the heater 5 in order to sense the temperature of the hot water boiled within the heating can 4.

The example shown in FIG. 12 is an example in which a solenoid valve or an electric valve is used as the on-off valve 11. In this example, the temperature inside the heating can 4 is sensed by a thermostat 22 or the like, and when a predetermined temperature is reached, the thermostat 22 is turned off and the electromagnetic valve or electric valve 11 is opened to guide water into the heating can 4. When the temperature of the water drops due to the inflow of water and the thermostat 22 is turned on, the electromagnetic valve or electric valve 11 is closed and the inflow of water is cut off. Alternatively, an appropriate sensor and a controller may be combined, and an operation signal may be sent from the controller based on a detection signal from the sensor, so that the electromagnetic valve or the electric valve 11 is opened or closed each time the water temperature rises or falls.

In addition, in the case of a type in which the molten metal pipe 10 is exposed outside as shown in FIG. 10, the thermostat 22 may be attached to the molten metal pipe 1O in addition to being attached to the heating can 4.

In the embodiment shown in FIG. 1, the hot water supply pipe 10 is provided at the center of the hot water storage tank 1, but it may also be provided close to the inner wall 1a of the tank as shown in FIG. 13, or as shown in FIG. It may be provided in contact with the inner wall 1a as shown in FIG. Furthermore, as shown in FIG. 10, it may be arranged outside the hot water storage tank 1, and the upper end of the hot water guide pipe 10 may be connected to the upper part of the hot water storage tank 1.

The hot water supply port 23 may be provided directly above the hot water storage tank 1 as in the embodiment shown in FIG. 1, but it may also be provided next to the hot water storage tank 1 as shown in FIG.

Alternatively, as shown in FIG. 16, the inner end of the hot water sampling pipe 15 may be located near the center of the upper part of the hot water storage tank 1 and taken out from the side of the hot water storage tank 1.

Although various embodiments have been described above, the present invention can 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.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an instant heat storage type electric water heater according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the heater shown in Fig. 1, and Figs. 3 and 4 are water supply, respectively. FIG. 5 is an explanatory diagram showing another example of mounting the heater, FIG. 6 is an explanatory diagram showing another example of mounting the heating can, and FIG.
~IO diagrams are explanatory diagrams showing other installation examples of on-off valves, respectively.
Figures 11 and 12 are explanatory views showing other configuration examples of the on-off valve, Figures 13 and 14 are explanatory views each showing other installation examples of the hot water pipe, and Figures 15 and 16 are explanatory views showing other examples of the hot water supply pipe, respectively. FIG. 17 is a sectional view showing a conventional instant-heat hot water storage type electric water heater. (Main symbols in the drawings) 1: Hot water storage tank 4: Heating can 5: Heater lO: Hot water pipe 11: On-off valve Fig. 2 Fig. 5, Heater Fig. Fig. Fig. 10 Fig. 12 Fig. 13 Figure 17 Figure 15 Figure 16 Procedural amendment (voluntary) October 25, 1991 - Ward

Claims (1)

[Claims] 1. A heating can that is placed at the bottom of the hot water storage tank and partitioned by a partition wall that prevents water from flowing into the bottom of the hot water storage tank, a heater that is placed inside the heating can, and a heating can that is heated from the top of the heating can. The hot water supply pipe is equipped with a hot water pipe that sends hot water to the top of the hot water storage tank, and an on-off valve that opens and closes to allow or prevent water from flowing into the bottom of the hot water storage tank into the heating can. Alternatively, an instant heat hot water storage type electric water heater is characterized in that it opens when the hot water in the hot water pipe reaches a predetermined temperature or higher and closes when the hot water in the pipe reaches a predetermined temperature or lower.