JP2868066B2 - Hot water storage type electric water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type electric water heater. More specifically, the present invention relates to a quick-heating hot water storage type electric water heater that can rapidly heat water in a hot water storage tank and take out hot water in a short time.

[0002]

2. Description of the Related Art A conventional electric water heater is provided with a heater at an inner lower portion of a hot water storage tank, connects a water supply pipe below the hot water storage tank to supply water, and connects a hot water supply pipe above the hot water storage tank to connect hot water. Is configured to be taken out.

[0003]

However, in the conventional electric water heater, since the entire water in the hot water storage tank is always heated by the heater, the heating time until the hot water becomes long, and after the hot water is used up, There was a problem that it took a long time to boil and remove hot water. From the standpoint of the user, it goes without saying that a quick heating function for taking out hot water in a short time even after the hot water has run out is convenient and convenient. However, electric water heaters currently on the market have almost no immediate heat function.

In view of such circumstances, the present applicant has already proposed a hot water storage type electric water heater having a quick heating function (Japanese Patent Laid-Open No. 4-4325), but the present invention further improves and develops this. It is easy to manufacture and low cost,
It is an object of the present invention to provide a hot water storage type electric water heater that can quickly take out hot water.

[0005]

According to the first aspect of the present invention, there is provided a rapid heating type hot water storage type electric water heater , wherein a dome is provided above and below a cylindrical body plate.
A pressure vessel is formed by attaching an end plate in the shape of a cylinder.
Insert a disk-shaped separation plate between the lower end of the plate and the lower end plate
A water supply port is provided at a lower part of the pressure vessel , a hot water supply port is provided at an upper part, and a hot water storage tank having an upper part of the separation plate as a hot water storage part and a lower part as a heating part is disposed in a heating part of the hot water storage tank. Heater, and a hot water pipe for sending hot water heated from the heating unit upward in the hot water storage unit,
A hot water pipe disposed between a lower portion in the hot water storage portion and a lower portion in the heating portion; and a temperature sensing on-off valve interposed at a lower end of the hot water pipe, wherein the hot water pipe penetrates through the separation plate.
And the lower end of the hot water pipe projects below the separation plate.
The temperature sensing on-off valve at the lower end of the hot water pipe and the separation plate
An air reservoir is formed between the heating unit and the lower surface, and the temperature sensing on / off valve is opened when the temperature of the hot water in the heating unit is higher than a predetermined temperature, and is closed when the temperature of the hot water is lower than the predetermined temperature. In the invention according to claim 2, the hot water pipe is formed by an inner cylinder and an outer cylinder.
The upper end between the inner and outer cylinders is closed and the lower end is open.
And the lower end of the inner cylinder projects below the separation plate.
And the temperature sensing on-off valve is attached.
And the lower end of the outer cylinder is fixed to the separation plate.
It is characterized by. The invention according to claim 3 is characterized in that the temperature sensing cylinder portion exposed to the cold water side of the temperature sensing on-off valve is insulated .
You.

[0006]

According to the first aspect of the present invention, first, only the water in the heating section is heated by the heater, so that the temperature of the hot water in the heating section can be raised in a very short time. In this case, since the temperature sensing on-off valve is closed until the hot water temperature reaches the predetermined temperature,
While the hot water temperature does not rise sufficiently, the hot water in the heating unit does not move through the hot water pipe into the hot water storage unit. Therefore, the water in the heating section can be reliably heated to high-temperature hot water. When the hot water reaches a predetermined temperature, the temperature sensing on-off valve opens, so that the hot water in the heating unit passes through the hot water pipe and is guided to the upper portion of the hot water storage tank. Since the hot water has a large temperature difference from the water in the tank and a density difference (specific gravity difference), the hot water is stored in the upper portion of the hot water storage portion in a separated state without being mixed with water. After the hot water rises in the hot water pipe, the water in the lower portion of the hot water storage section enters the heating section through the water pipe, so that the temperature sensing on-off valve is closed again. And it heats with a heater until the water in a heating part turns into hot water. Thereafter, the total amount of water is heated to boiling water by this repetition. According to the present invention, anyway, if the water in the heating section is first boiled, the hot water can be taken out therefrom, so that the hot water can be discharged in a very short time. In the invention of claim 1,
Is a circle between the lower end of the original cylindrical shell and the end plate.
A hot water storage tank can be configured simply by sandwiching a plate-shaped separation plate. I
Therefore, the only additional member is the separation plate,
Since the plate may be a simple disk, the manufacturing process is extremely small,
Manufacturing costs are also low. Further, the invention of claim 1
Then, project the lower end of the hot water pipe below the separation plate,
Simple configuration with a temperature sensing on-off valve attached to the lower end
To form an air pocket effective for heat insulation on the lower surface of the separation plate
Can be used without the need for extra components,
It can be manufactured at low cost. Further, since the heat of the heating section is prevented from escaping to the hot water storage section by the air insulation section formed by the air pool on the lower surface of the separation plate, the heating section can be heated to the hot water in a shorter time.
According to the invention of claim 2, air generated from water during heating
Are inward from the open lower ends of the inner and outer cylinders of the hot water pipe.
Enter the hot water pipe and insulate it with air.
Hot water sent to the outside is not deprived of heat by external cold water
No. In addition, since air insulation is performed by dissolved air in water,
Manufactured at low cost without using separate materials for insulation
It can be done and does not require maintenance. According to the invention of claim 3
If the cold water side of the temperature sensing cylinder of the temperature sensing
As a result, heating is not affected by the temperature of cold water in the hot water storage section.
Opening and closing is controlled only by the temperature of the hot water inside the unit,
There is no delay in the opening and closing operation of the temperature sensing on-off valve, and the boiling water
The opening operation is performed without time delay for the beam. Yo
Thus, there is no delay in the supply of hot water.

[0007]

Next, an embodiment of the present invention will be described in detail with reference to 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 is housed in an outer plate 3. The hot water storage tank 1 is a cylindrical pressure vessel, and is separated into a hot water storage section 1A and a heating section 1B using a separation plate 6 at a lower portion of the hot water storage tank 1. A heater 5 for heating water in the heating unit 1B is disposed in the heating unit 1B. A water supply pipe 13 is connected to a water supply port 17 at the bottom. A water pipe 7 is arranged between a lower part in the hot water storage part 1A and a lower part of the heating part 1B. The lower end of the water pipe 7 is provided with a rectifier 7a whose skirt is widened in order to rectify the supplied water, but the rectifier 7a may not be required in some cases. In addition, a rectifier 18 that moderates the flow of water supplied to the hot water storage unit 1A is installed above the water pipe 7.

[0008] Further, a hot water pipe 10 for feeding hot water in the heating section 1B above the hot water storage section 1A is joined to the separation plate 6, and extends near the zenith of the hot water storage section 1A. A hot water supply port 23 is formed at the zenith of hot water storage section 1A.
A hot water supply pipe 15 is connected to 3 so that hot water in the hot water storage section 1A can be sent to a hot water tap 16. In addition, hot water pipe 10
Has a lower end protruding from the separation plate 6 toward the heating section 1B,
A temperature sensing on-off valve 11 is mounted at the lower end. Soshi
The hot water must be sent to the hot water pipe 10 through the on-off valve 11. The temperature sensing on-off valve 11 senses the temperature of the hot water in the heating unit 1B, opens at a predetermined temperature (for example, 90 degrees), and closes at a temperature lower than that. The space between the lower surface of the separation plate 6 and the temperature sensing on-off valve 11 is an air reservoir 30 for insulating the air. further,
Although not shown, a thermostat or an earth leakage circuit breaker is attached so that temperature control and safety can be maintained. Next, a more specific configuration of the electric water heater will be described. FIG. 2 shows the configuration of the hot water storage tank 1, and the separation plate 6 includes a cylindrical body plate 1 a of the hot water storage tank 1 and a dome-shaped end plate 1.
b. With such a configuration, the cylindrical body plate 1a and the end plate 1b are originally structural members as pressure vessels, and it is sufficient to manufacture only the disk-shaped separation plate 6, so that there is an advantage that it can be easily manufactured at low cost. . Further, as shown in FIG. 3, a shallow dish-shaped plate having a central portion 6b formed in a concave shape with respect to a peripheral edge portion 6a may be used as the separating plate 6. In the illustrated example, since the central portion 6b of the separation plate 6 projects downward, the volume of the heating section 1B can be reduced even if the position sandwiching the separation plate 6 is the same. Conversely, when the central portion 6b is projected upward, the volume of the heating section 1B can be increased. In this way, it is possible to always secure an appropriate volume of the heating unit 1B with respect to a change in the capacity of the heater 5. Claims
The "disc shape" referred to in
This is a concept that also includes a protruding separation plate.

FIGS. 4A and 4B show the temperature sensing on-off valve 11.
And its mounting structure. The hot water pipe 10 is inserted and fixed through the hole of the separating plate 6, and the lower end of the hot water pipe 10 projects slightly downward. The protrusion amount h is an element that determines the volume of the air reservoir 30. Lower end opening 10a of hot water pipe 10
Is mounted with a temperature sensing on-off valve 11. In the temperature sensing on-off valve 11, a heat-sensitive driving body 46 including a temperature-sensitive cylinder 44 and a piston 45 is interposed between an upper housing 41 and a lower housing 43, and a large-diameter portion 47 of the temperature-sensitive cylinder 44 is provided.
A valve seat 48 is fitted to the lower surface of the housing, and a compression spring 49 is interposed between the valve seat 48 and the lower housing 43. The upper housing 41 has an annular peripheral portion 42. When the temperature sensing tube 44 does not sense a high temperature, the valve seat 48 closes to the lower surface of the peripheral portion 42 and closes due to the restoring force of the spring 49 (see FIG. 7A). When the high temperature is sensed, the piston 45 extends, and as shown in FIG. 7B, the temperature sensing cylinder 44 is guided by the guide portion 43a of the lower housing 43 and descends, and the valve seat 48 is also pushed down. As a result, the peripheral portion 42 and the valve seat 48 are separated from each other and the valve is opened. In the temperature sensing on-off valve 11 of the present embodiment, the temperature of the hot water in the heating unit 1B is sensed by the temperature-sensitive cylinder 44, but the upper part of the temperature-sensitive cylinder 44 is exposed inside the hot water pipe 10. The portion comes into contact with water in the hot water pipe 10 or low-temperature hot water (the cold water side in the claims). For this reason, the lower part of the temperature-sensitive cylinder 44 has a predetermined temperature (for example, 90 degrees)
Even if it is in contact with the hot water, the surface of the large-diameter portion 47 on the upper part of the temperature-sensitive cylinder 44 is coated so that the heat is taken away due to the low temperature of the upper portion and the operation of the heat-sensitive driving body is not delayed or incomplete operation occurs. The cap 40 made of a heat insulating material is attached as described above. Therefore, in the temperature sensing on-off valve 11 of the present embodiment, when the inside of the heating section 1B is heated to hot water of a predetermined temperature, the valve can be reliably opened in response to the set temperature.

FIG. 5 is a plan view of the temperature sensing on-off valve 11.
FIG. 6 is an enlarged sectional view taken along the line VI in FIG. One, if necessary, several air vent holes 50 are formed in the peripheral portion 42 of the upper housing 41 of the temperature sensing on-off valve 11. A convection prevention valve 51 is inserted into the air vent hole 50 as shown in FIG. The convection prevention valve 51 has a head 5
2. The head 52 has an outer diameter larger than the inner diameter of the air vent hole 50 so that the head 53 does not fall down. However, the neck 53 is thin and convective due to the air pressure from below. When the prevention valve 51 is pushed up even a little, the air flows upward through the air vent hole 50. Further, when the water is heated in the heating unit 1B to form hot water, the temperature difference with the water (hot water) in the hot water pipe 10 connected above the temperature sensing on-off valve 11 increases, and the density difference (specific gravity difference) increases. ) Occurs, and the water (hot water) in the hot water pipe 10 is
Convection flows through the hot water in B and the air vent hole 50 (see FIG. 5). However, since the anti-convection valve 51 closes the air vent hole 50 by its own weight, the hot water pipe 1
Convection with the water (hot water) in 0 does not occur, so that only the water in the heating unit 1B can be heated to hot water in a short time.

Next, the operation of the above embodiment will be described with reference to FIGS. First, the water supply port 1 through the water supply pipe 13
The water supplied from 7 enters the heating unit 1B, and the air that was empty is pushed up by the convection prevention valve 51 of the air vent hole 50 and escapes upward, and the water surface rises to the position of Wa. And it becomes full. The space between the water surface Wa and the separation plate 6 serves as an air reservoir 30, and serves as an air insulation layer between the heating unit 1B and the hot water storage unit 1A. At the same time as the water is supplied to the heating section 1B, the water flows through the water pipe 7 and the flow of water is moderated by the rectifier 18, and enters the hot water storage section 1A. The section 1A is full, and the heating section 1B and the hot water storage section 1A, that is, the entire hot water storage tank 1 are full. Thereafter, when electricity is supplied, the heater 5 heats the water in the heating unit 1B. The surroundings of the heating unit 1B are kept warm by the heat retaining material 2, and the hot water storage unit 1A is kept warm by the air reservoir 30 between the separation plate 6 and the water surface Wa. Is boiled in boiling water.
The heating action at this time will be described later in detail. The temperature sensing on-off valve 11 provided at the lower end of the hot water pipe 10 and near the zenith of the heating unit 1B is closed by sensing the low temperature of the water temperature when the inside of the heating unit 1B is full. The water in the heater 5
When it is heated and boiled, the valve senses high temperature and opens the valve, and the hot water in the heating unit 1B rises in the hot water pipe 10 due to the difference in specific gravity with the water in the hot water storage tank 1, and the hot water storage unit Stored on top of 1A.

Since the hot water has a large temperature difference from the water in the hot water storage section 1A and a density difference (specific gravity difference), it is stored above the hot water storage section 1A in a separated state without being mixed with water. This state is indicated by reference numeral a in FIG. The hot water in the heating section 1B rises to the zenith of the hot water storage section 1A through the hot water pipe 10 and the water under the hot water storage section 1A passes through the water pipe 7 and the heating section 1B.
From below. The temperature sensing on-off valve 11 is closed by sensing the low temperature of the water that has entered, and the heater 5 closes the heating unit 1.
The water in B is heated again. Then, when the hot water is boiled, the high temperature is sensed and the temperature sensing on-off valve 11 is opened, and the hot water in the heating section 1B is sent to the upper part of the hot water storage section 1A through the hot water pipe 10 and stored. Thereafter, this phenomenon is repeated, and hot water is stored in hot water storage section 1A. The states in which the hot water is intermittently stored in the hot water storage section 1A in this manner are indicated by reference numerals A, B, C, and D. The symbol A indicates a state in which the hot water a stored at the uppermost portion is sequentially pushed down by the hot water B, C, and D.

Next, the heating action in the heating section 1B will be described with reference to FIG.
This will be described in more detail with reference to FIGS. The air vent hole 50 provided in the temperature sensing opening / closing valve 11 is closed by the weight of the convection prevention valve 51. Water supply starts from the water supply pipe B, water enters the heating section 1B from the water supply port 17, and the pressure in the heating section 1B rises as the water level Wa rises, and the convection prevention valve 51 is pushed up by the pressure,
Air is discharged from the air vent hole 50. Water supply is continued, and when the inside of the heating unit 1B is filled with water, the water surface W
a is achieved up to the mounting seat surface of the temperature sensing on-off valve 11 of the hot water pipe 10 to be guided. Since there is no hole from which the air escapes above the mounting seat surface, the air is sealed in the air reservoir 30 between the water surface Wa and the separation plate 6. When the inside of the heating section 1B is full and subsequently the inside of the hot water storage section 1A is full, the hot water tap 16 is closed. When the hot water tap 16 is closed, the pressure inside the hot water storage tank 1 is increased to the pressure set by the pressure reducing valve 14 (normally 0.8 kg / cm 2: gauge pressure), and therefore, the hot water is sealed in the air reservoir 30 between the water surface Wa and the separation plate 6. The supplied air is compressed to almost half the volume, and the water surface Wa on the mounting seat surface of the temperature sensing on-off valve 11 initially rises to almost half the distance between the separation plates. The state is indicated by a symbol Wb. The air reservoir 30 between the water surface Wb and the separation plate 6 serves as an air insulation layer between the hot water storage section 1A and the heating section 1B in the heated state of the initial heating section. When the heater 5 is energized in this state and the water temperature in the heating section 1B rises, the air dissolved in the water separates and rises with the rise of the water temperature, and the air pool 3 between the separation plate 6 and the water surface Wb.
The volume is added to 0, and the volume of the air reservoir 30 gradually increases.

Further, as the heater 5 is energized and the water temperature in the heating section 1B rises, the air in the air reservoir 30 between the water surface Wb and the separation plate 6 also rises in temperature and increases in volume.
The water surface Wb is gradually pushed down by these phenomena,
Eventually, the water surface Wa of the mounting surface of the initial temperature sensing on-off valve 11.
Reach up to. When this phenomenon continues, when the water surface Wa comes to a position below the mounting surface of the temperature sensing on-off valve 11, the air pushes up the convection prevention valve 51 and escapes from the air vent hole 50 into the hot water pipe 10 and the hot water storage portion. Accumulated at the top of 1A,
As the pressure in the hot water storage tank 1 increases, the hot water is discharged together with the hot water from a relief valve having a function of keeping the inside of the hot water storage tank 1 within a certain pressure. As described above, the air reservoir 30 is reserved for a fixed volume between the separation plate 6 and the mounting seat surface of the temperature sensing on-off valve 11. Thereafter, the excess air in the air reservoir 30 which is gradually increased pushes up the convection prevention valve 51 through the air vent hole 50 and is discharged, or when the temperature sensing on-off valve 11 is opened, rises in the hot water pipe 10 together with hot water. It is discharged to the upper part of hot water storage section 1A. Thereafter, although slightly fluctuating, the air reservoir 30 between the water surface Wa and the separation plate 6 is heated.
It is possible to perform air insulation between Part 1 B and the hot water storage unit 1A.

After the excess air has thus escaped, the air vent hole 50 is closed by the weight of the convection prevention valve 51. If the convection prevention valve 51 is not provided, the hot water in the heating unit 1B escapes from the air vent hole 50 as the temperature rises and the temperature sensing on-off valve 11 is closed, and the water in the hot water storage unit 1A is guided by the escaped amount. It passes through the water pipe 7 and enters the heating unit 1B. As a result, a convection action is performed, which causes a delay in the temperature rise rate in the heating unit 1B. Further, without the air vent hole 50, air existing in the heating unit 1B before water supply cannot be released,
The inside of the heating section 1B is no longer filled with water, which causes an accidental burning. In the present invention, the air vent hole 50 and the convection prevention valve 51 achieve shortening of the time for boiling into hot water and prevention of an accidental burning. Therefore, the air vent hole 50 is absolutely necessary, and the convection prevention valve 51 is necessary for heating the water in the heating unit 1B to the hot water in a short time.

The air vent hole 50 is always provided with a convection prevention valve 51.
Is closed by its own weight, but when the air is released, it is lifted by pressure from below, and the air is released from the gap between the narrow neck portion 53 and the air vent hole 50. The convection of hot water can be prevented, and very efficient heating can be performed. Further, when the inside of the heating unit 1B and the inside of the hot water storage unit 1A are filled with water and the heater 5 is energized, the inside of the heating unit 1B is heated by the heater 5, the temperature rises, and the temperature sensing on-off valve 11 senses high temperature. However, since the temperature sensing tube portion 47 of the temperature sensing on-off valve 11 is immersed in the cold water in the hot water pipe 10, the high-temperature reaction is delayed and the hot water temperature varies. In the initial stage when the water temperature in the hot water pipe 10 is extremely low, the temperature sensing on-off valve 11 does not operate, and the hot water in the heating unit 1B also boils. In order to solve this problem, the above-mentioned problem has been solved by providing a heat-insulating cap in the temperature-sensitive cylinder portion 47 located on the cold water side of the temperature-sensing on-off valve 11, thereby providing heat insulation.

Since the above treatment has been performed, the heating unit 1B
The water inside is heated to hot water more effectively by the heater 5 in a very short time.

Next, another embodiment other than the above will be described. Although the water supply pipe 13 is connected to the bottom of the heating unit 1B in the above embodiment, the water supply pipe 17 may be connected to other than the bottom as long as the water supply port 17 is provided at the bottom of the heating unit 1B. For example, as shown in FIG. You may make it insert the water supply pipe 13 from the upper part of the part 1B, and extend the front-end | tip of the water supply pipe 13 to a bottom part. In this case, the water supply pipe 13 may be a single pipe, but it is more effective to provide heat insulation such as a double pipe or a heat insulating material covering a portion passing through the heating section 1B.

Further, as shown in FIG.
A may be located below A, that is, above the separation plate 6. In this case, the water supply port 1 of the water supplied from the water supply pipe 13
7 requires a rectifier 18. Similarly, as long as the water supply port 17 is at the bottom of the hot water storage section 1A, it may be anywhere, and the water supply pipe 13 may be inserted downward from above the hot water storage tank 1 as shown in FIG. In this case, it is more effective to heat-insulate the portion passing through the hot water storage section 1A, such as by coating a double pipe or a heat insulating material.

As shown in FIG. 11, the water supply pipe 13 is mounted on the bottom surface of the heating section 1B, but the water supply port 17 may be located below the hot water storage section 1A. In this case, the water pipe 1
A configuration 3 is considered to pass through the water pipe 7. Further, FIG.
2, the water pipe 7 is connected to the lower part of the hot water storage section 1A and the heating section 1B
Is also conceivable in which the lower part is connected to the outside. In the illustrated example, the water pipe 7 connected below the hot water storage section 1A is connected to the water supply pipe 13. In short, the attachment position of the water supply pipe 13 may be any position of the heating section 1B and the hot water storage section 1A, but the water supply port 17 may be located at the bottom of the hot water storage section 1A or the bottom of the heating section 1B or both. . However, in any case, it is preferable that the lower part of the hot water storage part 1A and the lower part of the heating part 1B are connected at a short distance.

The shape of the heater 5 is not limited, but it is desirable that the heater 5 be located at the bottom of the heating section 1B.
Regarding the water pipe 7, the water pipe 7 and the water supply pipe 13 do not necessarily have to be at the concentric position. However, when the water pipe 7 is displaced, a high-performance rectifier that moderates the water flow into the water supply port 17 of the water supply pipe 13 is provided. is necessary. It is preferable that the water guide pipe 7 passing through the high-temperature hot water in the heating unit 1B has a heat insulating structure rather than a single pipe. The example of FIG. 13 shows a concentric inner cylinder 7a and outer cylinder 7a.
The water guide pipe 7 is constituted by a double cylinder consisting of b and has an air reservoir inside. The lower end of the water pipe 7 is open, and air enters through the lower end opening, and the air can insulate the air. In the example of FIG. 14, the water guide pipe 7 is configured by a triple pipe in which an outermost pipe 7c is further attached to the outer circumference of a double pipe outer pipe 7b. Also in this case, the lower end is open, and air enters from the lower end opening, and the air insulates the air. Note that the outermost cylinder 7c is formed below the middle of the outer cylinder 7b. In this case, even if the internal air is compressed upward by the pressure in the heating unit 1B, the lower end of the stored air is located at the middle position b in the inner layer, but the lower end of the outermost cylinder 7c in the outer layer. Since it is located at the position of the symbol c which is an intermediate position, there is an advantage that the water guide pipe 7 can be insulated in more parts.
In the example of FIG. 15, the upper and lower ends of the inner cylinder 7a and the outer cylinder 7b are sealed, and the heat is insulated by the trapped air. The example of FIG. 16 has a sandwich structure in which a member having poor thermal conductivity (silicon, urethane, or the like) is press-fitted, sealed, and foamed between the inner cylinder 7a and the outer cylinder 7b. The water pipe 7 may be made of a material having poor heat conductivity.

The separation plate 6 is not a simple plate, but has a hollow box structure as shown in FIG. 17 and an air reservoir 30 in which air is sealed inside, or a metal plate as shown in FIG. A member having poor thermal conductivity 35 in the hollow portion of the metal plate
(Silicon, urethane, etc.) may be formed into a sandwich structure by press-fitting, enclosing, and foaming. Further, an air reservoir 30 may be formed therein, and the separation plate 6 is made of a material having poor heat conductivity. May be. In the example shown in FIG. 19, several partition plates 61 and 62 are provided on the separation plate 6, and the partition plate 62 is projected downward from the partition plate 61 so that the volume for storing air becomes larger in order to improve the heat insulating performance. This is an example in which the time required for heating is reduced by increasing the amount of water to be heated in the heating unit 1B and reducing the amount of water to be heated. In this case, the water surface Wa, Wa ', W
Even if a ″ rises, the amount of air stored on the upper surface is sufficiently large, so that a high heat insulating effect and the heating unit 1B
This has the effect of reducing the amount of water inside.

The hot water pipe 10 is also constituted by a single pipe.
As shown in FIG. 20, the inner cylinder 10a and the outer cylinder 10b
And make it a double tube,Above between the inner cylinder 10a and the outer cylinder 10b
Close the end and open the bottomForm the air reservoir 30 inside
It can be a structured structureNo. Then, the lower end of the inner cylinder 10a is separated.
The lower end of the inner cylinder 10a
Attach on-off valve 11 and separate lower end of outer cylinder 10b
It is fixed to the plate 6.In addition, as shown in FIG.
The upper and lower ends of the outer cylinder 10b are closed, and the sealed interior is aired.
A heat insulating structure with the pool 30 may be used, as shown in FIG.
A member having poor heat conductivity between the inner cylinder 10a and the outer cylinder 10b.
35 is a sandwich structure made by press-fitting, enclosing and foaming
Insulating method may be used. Or, heat conduction pipe 10
It may be made of a material having poor properties. Above hot water storage tank 1
The hot water supply pipe 12 provided in the section is the topmost section in the above embodiment.
23, but as shown in FIG.
Is placed at the top of hot water storage tank 1 and hot water supply pipe 12 is stored.
It may be configured to be discharged from the side wall of the hot water tank 1.

[0024]

According to the first aspect of the present invention, after the hot water runs out,
Hot water can be discharged in a short time,
It can be manufactured at low cost and can efficiently heat boiling water.
I can. According to the invention of claim 2, boiling water is efficiently boiled.
And can be manufactured at low cost. According to the invention of claim 3
Eliminates delays in the operation of the temperature sensing on-off valve
You can control.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hot water storage type electric water heater according to an embodiment of the first invention.

FIG. 2 is a sectional view of a joining structure of a separation plate 6 in the electric water heater of FIG.

FIG. 3 is a sectional view of another joining structure of the separation plate 6 in the electric water heater of FIG.

FIG. 4 is an explanatory view of the temperature sensing on-off valve 11 and the air reservoir 30.

FIG. 5 is a plan view of the temperature sensing on-off valve 11;

6 is a sectional view taken along the line VI in FIG. 5 and is an explanatory view of an air vent hole 50 and a convection prevention valve 51. FIG.

FIG. 7 is an explanatory diagram of a heating action in the electric water heater of FIG. 1;

FIG. 8 is an explanatory diagram of another example of the water supply pipe 13;

FIG. 9 is an explanatory diagram of still another example of the water supply pipe 13;

FIG. 10 is an explanatory diagram of still another example of the water supply pipe 13;

FIG. 11 is an explanatory view of still another example of the water supply pipe 13;

FIG. 12 is an explanatory view of another example of the water pipe 7;

FIG. 13 is an explanatory view of a heat insulating structure of the water pipe 7;

FIG. 14 is an explanatory diagram of another example of the heat insulating structure of the water pipe 7;

FIG. 15 is an explanatory view of still another example of the heat insulating structure of the water pipe 7;

FIG. 16 is an explanatory view of still another example of the heat insulating structure of the water pipe 7;

FIG. 17 is an explanatory diagram of a heat insulating structure of the separation plate 6.

FIG. 18 is an explanatory diagram of another example of the heat insulating structure of the separation plate 6.

FIG. 19 is an explanatory diagram of still another example of the heat insulating structure of the separation plate 6.

FIG. 20 is an explanatory diagram of a heat insulating structure of the hot water pipe 10.

FIG. 21 is an explanatory view of another example of the heat insulating structure of the hot water pipe 10.

FIG. 22 is an explanatory view of still another example of the heat insulating structure of the hot water pipe 10.

FIG. 23 is an explanatory view of another example of mounting a hot water pipe.

[Explanation of symbols]

1 Hot water storage tank 1A Hot water storage unit 1B
Heating unit 4 Heating can 5 Heater 6
Separation plate 7 Water pipe 8 Hot water storage tank 9
Heating tank 10 Hot water pipe 11 Temperature sensing on-off valve 3
0 Air pool 40 Protective cap 41 Top plate 4
2 side wall 50 air vent 51 convection prevention valve

Continuation of the front page (56) References JP-A 50-15144 (JP, A) JP-A 51-71537 (JP, A) JP-A 62-40457 (JP, U) JP-A 4-117346 (JP) , U) Fully open 1974-9348 (JP, U) Fully open 1974-69445 (JP, U) Fully open 1974-52144 (JP, U) Fully open 1974-32484 (JP, U) 48-5317 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24H 1/18

Claims (3)

(57) [Claims] A dome-shaped end plate above and below a cylindrical body plate.
Attach to the pressure vessel, the lower end of the cylindrical body plate
With a disk-shaped separation plate between
A water supply port is provided at a lower portion of the pressure vessel , a hot water supply port is provided at an upper portion, and a hot water storage tank having a hot water storage portion above the separation plate and a heating portion below the separation plate , and is disposed in a heating portion of the hot water storage tank. A heater, a hot water pipe that sends hot water heated from the heating section upward in the hot water storage section, a water guide pipe disposed between a lower portion in the hot water storage section and a lower portion in the heating section, and a lower end of the hot water pipe. An interposed temperature-sensing on-off valve, wherein the hot water pipe penetrates through the separation plate , and is provided below the hot water pipe.
The end protrudes below the separation plate, and
Air pool between the temperature sensing on-off valve at the end and the lower surface of the separator
There are formed, the temperature sensing off valve, said opening when the hot water in the heating unit is equal to or higher than a predetermined temperature, immediately thermal hot water storage type electric water heater, characterized in that is closed when a predetermined temperature or less. 2. The hot water pipe comprises an inner cylinder and an outer cylinder.
And the upper end between the outer cylinder is closed and the lower end is open,
The lower end of the inner cylinder projects below the separation plate,
The temperature sensing on-off valve is attached to the outer cylinder
Characterized in that the lower end is fixed to the separating plate
The hot water storage type electric water heater according to claim 1. Wherein the temperature sensing off valve immediately thermal hot water storage type electric water heater according to claim 1 Symbol mounting the temperature sensing cylinder portion which is exposed to the cold water side, characterized in that the thermal insulation of.