JPH0443257A - Instant heat hot water storage type electric water heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

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

However, since this boat-type 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.

Therefore, we purchased an instant-heat electric water heater (Showa 5°-1862).
5) was proposed, and it is configured as shown in FIG. 5o is a hot water storage tank, and a hot water supply pipe 51 is arranged vertically inside the tank. 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. Also,
Finally, there was a problem in that even though the temperature of the hot water storage tank did not rise sufficiently, only the inside of the hot water supply pipe would boil and the hot water in the hot water storage tank would not rise.

However, in recent life, people have become accustomed to using hot water regardless of the time of day, the amount of hot water has increased, and the uses of hot water have expanded to include shampooing, bathing, washing dishes, and "morning bath" and "afternoon bath." , the desire to use hot water immediately becomes stronger.

In view of the above circumstances, the present invention provides an electric water heater that can reliably boil water in small quantities to hot water and can dispense hot water at a desired temperature in a very short time even after the hot water has run out. With the goal.

[Means for Solving the Problems] The instant heating hot water storage type electric water heater of the present invention includes: a heating can disposed at the bottom of a hot water storage tank; a heater disposed inside the heating can; Equipped with a hot water pipe that sends hot water heated from the top to the top of the hot water storage tank, and a temperature sensing on-off valve interposed in the middle of the hot water pipe,
The on-off valve is characterized in that it 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.

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.

Furthermore, the concept of the temperature-sensing on-off valve includes all types of on-off valves that open and close by sensing temperature.

[Function] According to the present invention, since only the water in the heating can is heated by the heater, the temperature of the water in the heating can can be increased in a very short time. In this case, the temperature sensing on-off valve is closed until the water temperature reaches a predetermined temperature, so the hot water in the heating can will not move through the hot water pipe into the hot water storage tank while the hot water temperature does not rise sufficiently. do not have. Therefore, the water in the heating can can be reliably brought to a boil.

When the hot water reaches a predetermined temperature, the on-off valve opens, and the hot water in the heating can is guided to the upper part of the hot water storage tank through the hot water pipe. This hot water has a large temperature difference and density difference (specific gravity difference) from the water in the tank, so it is stored in a separate state at the top of the hot water storage tank without mixing with the water.

After the hot water rises in the hot water pipe, water enters the heating can, so the on-off valve is closed again.

Then, the water in the heating can is heated by a heater until it becomes boiling water. From then on, repeat this process until the entire amount of water is boiled.

According to the present invention, the hot water can be taken out by first boiling the water in the heating can, so hot water can be dispensed in a very short time.

[Example] 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 bottom surface is completely open, and the top surface has an opening for connecting a molten metal pipe 10, which will be described later.

A heater 5 is arranged inside this heating can 4.

As shown in Fig. 2, the heater 5 includes a nichrome wire 7, which is an electric resistance heating element, in a copper or stainless steel vibro.
A lead wire 8 is connected to the lead wire 8. In addition, the second
The part surrounded by the chain line in the figure, that is, the nichrome wire 7
The part where is placed is called the main heater part 5a, and is the part that originally generates heat. The vibro connected to the main heater part 5a may also have heat, but this part only becomes high in temperature due to conduction heat from the main heater part 5a. The main heater portion 5a of the heater 5 is preferably located above the underline 4a of the heating can 4 within the heating can 4. If it is below, the water below the heating can 4 will be heated and move laterally and mix with the water in the hot water storage tank 1, so it will take extra time to obtain hot water.

In FIG. 1, reference numeral 10 denotes a hot water supply pipe, the lower end 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.

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 17 and opens, so the hot water in the heating can 4 flows through the hot water pipe 10.
rise through. Then, the molten metal is stored near the upper end opening of the molten metal pipe 10. 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. Thereafter, 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, C, and D, and eventually One cup of hot water can be stored in the hot water 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
only remains near heating can 4 (in other words,
When the hot water storage tank 1 is filled with hot water above the vicinity of the heating can 4, the convection between the inside and outside of the heating can 4 becomes slow, and the water temperature inside the heating can 4 remains high. Since the on-off valve 11 remains open, the on-off valve 11 remains open. Therefore, convection between the hot water heated in the heating can 4 and the water outside the heating can 4 continues, albeit slowly, and eventually the hot water storage tank 1 is boiled to its full capacity.

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 inside the hot water storage tank 1 as shown in FIG. The water supply pipe 18 may be erected at the top of the tank 1, and the water supply port 17 may be provided at the top of the tank 1.

In the embodiment shown in FIG.
2 is installed, but this may not be necessary depending on the water inlet.

The mounting position of the heater 5 is the hot water storage tank 1 in the above embodiment.
Although it is inserted from the bottom of the case, it may also be inserted from the side as shown in FIG. In addition, as shown in Fig. 6, the heaters 4 are mounted sideways in the tank 1, and the heaters 5
may be directly inserted into the heating chamber 4 from the side of the tank 1.

The heating unit 4 may be provided inside the hot water storage tank 1 as in the previous embodiment, or may be additionally installed outside the hot water storage tank 1, that is, at the bottom, as shown in FIG. Alternatively, a separate heating unit 4 may be attached to the bottom of the hot water storage tank 1 from below. The term "disposed at the bottom of the hot water storage tank" as used in the claims includes such a configuration. In the example shown in FIG. 7, a water supply pipe 18 with an open upper end is provided on the bottom of the hot water storage tank 1 in an upright position within the heating section 4.
The water sent to the water supply port 17 passes through the water supply pipe 18 and is heated every 4 hours.
It is designed to be guided within.

The temperature sensing on-off valve 11 may use a shape memory alloy plate shown in FIG. 1, or may use a shape memory alloy spring 19 as shown in FIG. In this example, the spring 19 senses the temperature and expands and contracts, and this movement causes the valve body 21 to open and close.

Further, a solenoid valve or an electric valve may be used as the on-off valve. In this case, as shown in Fig. 9, the internal temperature of each heating step is sensed by a thermostat 22, etc., and when a predetermined temperature is reached, the thermostat 22 is turned off and the solenoid valve or electric valve 11 is opened to lower the water temperature. When the thermostat is turned on, the solenoid valve or electric valve If can be closed. 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. Furthermore, when the hot water filled in the upper part reaches a predetermined temperature or higher from around 4th every heating, it is preferable to control the opening to be maintained.

In the embodiment shown in Fig. 1, the hot water supply pipe is provided at the center of the hot water storage tank 1, but it may be provided closer to the inside 11 of the tank as shown in Fig. 9, or as shown in Fig. 1θ. inner wall 1
It may be provided in contact with λ. Furthermore, it may be arranged outside the hot water storage tank 1 and communicated with the inside of the hot water storage tank 1 through a branch pipe.

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. 12, 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.

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. 5-6 are explanatory diagrams showing other mounting examples of the heater. FIG. 7 is an explanatory diagram showing other mounting examples for each heating. FIG. 10 is an explanatory diagram showing another example of a temperature sensing on-off valve, FIG. 10 is an explanatory diagram showing another example of a hot water supply pipe, and FIGS. FIG. 13 is a sectional view showing a conventional instant heat hot water storage type electric water heater.

(Main symbols on drawings) 1: Hot water storage tank 4: Every heating 5: Heater 10: Hot water pipe 11: Temperature sensing on/off valve

[Brief explanation of drawings]

Diagram: Hot water supply pipe temperature sensing on-off valve Diagram 1: Hot water storage tank diagram Diagram: Hot water storage tank heating can Diagram 5: Heater diagram: Hot water storage tank: Heating can 5: Heater diagram Diagram: Square drawing Procedure amendment form Yubaku August 26, 1991 1 Display of the incident 1990 Patent Application No. 150450 2 Name of the invention Address 307 Minato-cho, Marugame City, Kagawa Prefecture Name Yubatsu Co., Ltd. Representative Picture book Takebungai 1 person 4 Agent address Kagawa Prefecture 8-12 Kameicho, Takamatsu City 760 Phone: 0878-34-8424 Kusaka Jutaku Building 3rd Floor 5 Subject of Amendment (1) Contents of Amendment to Specification 6 (1) The scope of claims has been changed to “Amended Scope of Claims” ” shall be corrected as follows. (2) “Hot water tank
...The hot water in the heating can is divided into a hot water storage tank, a heating can, a heater placed inside the heating can, and a hot water heated from the top of the heating can to the upper part of the hot water storage tank. The hot water supply pipe is equipped with a temperature-sensing on-off valve installed in the hot water introduction pipe, and the on-off valve is configured to supply the hot water heated by the heater. (3) On page 5, lines 3 to 5, "Temperature-sensing on-off valves are a concept..." was changed to "Temperature-sensing on-off valves are any type of valve that opens and closes by sensing temperature." It is a concept that includes various types of on-off valves, and is installed at either the upper end, middle, or lower end of the molten metal pipe." (4) Correct “save” in line 1 on page 6 to “save”. (5) On page 6, lines 18-20, “Heating can 4 is generally...
"...on the top surface" is corrected to "on the top of the heating can 4." (6) “This heating can 4” on page 7, line 2, “Furthermore,
Heating can 4” is corrected. (7) Correct "Heater 5" in line 3 of page 7 to "This heater 5". (8) On page 8, line 3, “In the middle of the hot water pipe 10...”
- Correct J at the bottom to be "between the upper end and the lower end of the molten metal pipe 10, near the lower end in this embodiment." (9) "Save" in lines 7 and 18 of page 9 will be corrected to "save". (10) On page 9, line 12, "in the heating can 4" is corrected to "in the heating can 4 and the lower end of the hot water pipe 10." (11) On page 9, line 16, insert a line break and insert the following sentence after "Koninaru." [In this embodiment, since the on-off valve 11 is provided near the upper end of the hot water pipe 10, most of the water to be heated is the water in the heating can 4; 10 and the inner diameter of the hot water guide pipe 10 is relatively large, the hot water in the heating can 4 and the hot water in the hot water leading pipe 10 cause convection, so that the hot water in the heating can 4 The hot water below the on-off valve 11 in the hot water pipe 10 is simultaneously heated by the heater 5. (I2) On page 9, line 18, "hot water is in the hot water pipe 10" is corrected to "hot water is in the hot water pipe 10 in the hot water storage tank 1." (13) On page 10, line 4, ``because it does not decrease'' is corrected to ``natte''. (14) Page 10, line 15, page 11, line 15 and 11
All "water supply pipes 18" in line 17 of the page are corrected to "water supply pipes 18." 7 List of Attached Documents (1) r' Amended Claims 1 Amended Claims [1. A hot water storage tank, a heating can, a heater disposed inside the heating can, It is equipped with a hot water guide pipe that sends heated hot water from the top of the heating can to the upper part of the hot water storage tank, and a temperature sensing on-off valve installed in the hot water lead pipe, and the on-off valve is heated by the heater. An instant heating hot water storage type electric water heater is characterized in that it opens when the temperature of the place it is in reaches a predetermined temperature or higher and closes when the temperature drops below a predetermined temperature. The electric water heater according to claim 1, wherein the electric water heater is kept open when the hot water reaches a predetermined temperature or higher. J

Claims (1)

[Scope of Claims] 1. A heating can disposed at the bottom of the hot water storage tank, a heater disposed inside the heating can, and a hot water guide for delivering heated hot water from the top of the heating can to the top of the hot water storage tank. and a temperature-sensing on-off valve interposed in the middle of the hot water supply pipe, the on-off valve 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 falls below a predetermined temperature. An instant-heat hot water storage type electric water heater that operates as follows. 2. The temperature-sensing on-off valve is maintained in an open state when the hot water filled above the vicinity of the heating can in the hot water storage tank reaches a predetermined temperature or higher. Electric water heater.