JP2002364924A - Power-saving quick-heating electric water-heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater of improved power-saving and quick-heating properties, in which water is always supplied to a heating part, so long as water preheated by an auxiliary heat-source is available. SOLUTION: The electric water-heater is provided with a hot-water storing tank 1, upper and lower separating sheets 6A, 6B, a heat exchanger 41, a heater 5, a hot-water pipe 10, upper and lower water pipes 7A, 7B. The sheets 6a, 6B divide respectively the tank 1 into an upper hot-water storage part 1A, an intermediate auxiliary heating part 1B, and a lower heating part 1C. The heat exchanger 41 is built in an auxiliary heating part 1B. The heater 5 built in a heating part 1C. The hot-water pipe 10 is laid from the top of a heating part 1C to the top of a hot-water storage part 1A, and provided with a temperature sensing opening/closing valve 11 to the lower end thereof. The upper water pipe 7A is laid from the bottom of the part 1A to the lower part of the heat exchanger 41 in the auxiliary heating part 1B. The lower water pipe 7B is laid for conducting hot water from the top of the auxiliary heating part 1B to the lower part of the heater 5 in the heating part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-saving quick-heating electric water heater. More specifically, the present invention relates to a quick-heating electric water heater widely used for home and business use and capable of reducing power consumption.

[0002]

2. Description of the Related Art As a conventional power saving type quick heating type electric water heater, there is the following one proposed by the present applicant. Conventional example 1. Japanese Patent Application No. 5-301084 Conventional example 2. Japanese Patent Application No. 6-159432 Conventional example of power saving type immediate heating electric water heater 3． Japanese Patent Application No. 6-159433 No. 6-159433 Power-saving quick-heating electric water heater
No. 114246), making the immediate heat function more efficient and reducing power consumption. However, depending on the use conditions, although there is an effect of reducing the instantaneous heat and the power consumption as compared with the conventional electric water heater, the instantaneous heat and the like may not be exhibited. This will be described below.

As shown in FIG. 7, the prior art 1 uses an outer can type or an inner can type in which hot water is supplied intermittently from the top of the hot water storage tank 1 using a hot water storage tank 1 and a heater 5 as a main heat source. And an auxiliary heat source 40a for heating cold water stored below the hot water stored in the hot water storage tank 1. The auxiliary heat source 40a uses exhaust heat, hot water, or the like of existing facilities, or uses existing solar energy. If the water is heated to the hot water MW by the auxiliary heat source 40a, the heater 5 as the main heat source only needs to boil the hot water MW to the hot water HW, so that the power consumption can be reduced. In this prior art example 1, when hot water is supplied from a state where hot water HW is stored in the upper half of the hot water storage tank 1 shown in FIG.
The hot water MW that has been preheated in step (1) is pushed up. When this operation is repeated, as shown in FIG. 8, the amount of hot water HW equal to that of the cold water W decreases, and the warm water MW rises accordingly. When reheating is started from this state, water is supplied to the intermittent water heater A by sucking hot water MW from the water inlet of the water supply pipe 30 to the intermittent water heater A. In this case, since the intermittent water heater A heats the hot water MW, it can be heated in a shorter time than heating the cold water W as a matter of course.
Moreover, power consumption is reduced. However, in this case, the water supply pipe 3
It is limited to warm water above the zero water inlet. However,
When the hot water is further used, as shown in FIG.
W decreases more and more, and the corresponding amount of the cold water W is supplied, and the corresponding amount of the warm water MW rises. In this state, the water supply pipe 30
Is located in the cold water W, and the intermittent water heater A is supplied with the cold water W. In this case, since the cold water W is heated to the hot water HW, the heating speed is reduced. The warm water MW preheated by the intermittent water heater A has the effect of heating the cold water W and losing heat immediately.

In the prior art 2, as shown in FIG. 10, the hot water storage tank 1 is divided into upper and lower parts by a separating plate 6, an upper part of the separating plate 6 is a hot water storage part 1A, and an upper part of the lower part of the separating plate 6 is a heating part 1B. The lower part is an auxiliary heating unit 1C. Then, the heater 5 disposed in the lower portion of the heating section 1C of the hot water storage tank 1 and the hot water heated in the heating section 1B are stored in the hot water storage section 1A.
The hot water pipe 10 is disposed between the lower part in the hot water storage part 1A and the lower part of the heater 5 in the heating part 1B. A temperature sensing on-off valve 11 which is opened when the hot water in the portion 1B is higher than a predetermined temperature and is closed when the temperature is lower than a predetermined temperature.
A heat exchanger 41 disposed in the lower portion of the auxiliary heating section 1C of the hot water storage tank 1; and an auxiliary heat source 4 connected to the heat exchanger 41.
2 is provided. In this conventional example 2, as shown in FIG. 10, hot water HW is stored in hot water storage section 1A, and
By the heat exchanger 41 connected to the auxiliary heat source 42 in C,
When the use of hot water starts from the state heated to the hot water MW,
Cold water enters through the lower water supply port 17 and pushes up the hot water MW section, and at the same time, the hot water MW passes through the water pipe 7 and is stored in the hot water storage section 1A.
And push up the hot water HW in the hot water storage section 1A. The pushed hot water HW advances from the hot water supply pipe 15 to the faucet, and the hot water is discharged from the faucet. When this operation is repeated and the state shown in FIG. 11 is reached, that is, when hot water HW is used by the amount of cold water W and hot water MW enters the lower portion of hot water storage section 1A by that time, if reheating is started, heater The warm water MW above 5 is heated, and when it reaches a predetermined hot water temperature,
The temperature sensing on-off valve 11 is opened, and the hot water is sent to the upper portion of the hot water storage section 1A via the hot water pipe 10 and stored. At the same time, hot water storage unit 1
The hot water MW at the lower part of A flows into the auxiliary heating unit 1B via the water pipe 7 and the hot water MW flows after passing through the hot water pipe 10 because the temperature of the hot water MW is higher than that of the cold water at the lower part. Therefore, since the heater 5 heats the hot water MW, the heating speed is high, the power consumption is small, and the features of the power saving type immediate heating type can be exhibited. However, as the use of hot water further progresses, as shown in FIG.
When W is present, the cold water W flows to the lower part of the hot water storage unit 1A, so that the heater 5 in the heating unit 1B must heat the cold water to the hot water, the heating speed is slow, and the power consumption is low. Not only lose heat immediately, but also lose power saving. Furthermore, it means that the upper part has the hot water MW preheated by the heat exchanger 41.

In the prior art 3, as shown in FIG. 13, the hot water storage tank 1 is divided into upper and lower parts by a separating plate 6, and above the separating plate 6, the upper part is a hot water storage part 1A and the lower part is an auxiliary heating part 1
C, and the lower part of the separation plate 6 is a heating unit 1B. And, the heater 5 arranged in the lower part inside the heating part 1B of the hot water storage tank 1, the heat exchanger 41 arranged in the auxiliary heating part 1C of the hot water storage tank 1, and the auxiliary heat source 42 connected to the heat exchanger 41, Hot water heated in heating section 1B is stored in hot water storage section 1A
A hot water pipe 10 to be sent upward in the inside, a hot water pipe 7 arranged between the vicinity of the upper end of the heat exchanger 41 in the auxiliary heating section 1C and the lower area of the heater 5 in the heating section 1B, and the hot water pipe 10 A temperature sensing on-off valve 11 is provided, which is opened when the hot water in the heating unit 1B has reached a predetermined temperature or higher and closed when the temperature of the hot water is lower than a predetermined temperature. In Conventional Example 3, as shown in FIG. 13, hot water storage section 1A and auxiliary heating section 1C
After the hot water HW is stored inside, the use of hot water starts,
Cold water enters from the water supply port 17 and pushes up the hot water MW,
The hot water MW pushes up the hot water HW. The pushed hot water HW passes through the hot water supply pipe 15 to the faucet, and the hot water is discharged from the faucet. When this action is repeated and the state of FIG. 14 is reached, that is, when hot water HW is used by the amount of cold water W and hot water MW is pushed up by that amount, if additional cooking starts,
The inside of the heating section 1B is heated by the heater 5, and when a predetermined temperature is reached, the temperature sensing on-off valve 11 is opened, and the hot water HW is sent to the upper portion of the hot water storage section 1A via the hot water pipe 10 and stored. At the same time, the hot water MW pushed up from the water inlet of the water pipe 7 above the heat exchanger 41 in the auxiliary heating unit 1C.
Is a heater 5 provided at a lower portion inside the heating unit 1B through the water pipe 7.
Flows down to the bottom. The flowing hot water MW is heated by the heater 5 and passes through the temperature sensing on-off valve 11 to store the hot water 1A.
The water is stored after the hot water has been sent above, and is again heated by the heater 5. Therefore, since the heater 5 heats the hot water MW, the heating speed is high, the power consumption is small, and the characteristics of the power saving type immediate heating type can be exhibited. However, when the use of hot water further progresses, as shown in FIG. 15, when hot water HW and hot water MW are stored only in the upper portion of hot water storage tank 1 and when everything below water guide pipe 7 is filled with cold water, Since the cold water around the water inlet of the water pipe 7 flows through the water pipe 7 into the heating section 1B, the heater 5
Will be heated. Therefore, the cold water W is heated while the hot water MW is present, so that the heating speed is reduced, and there is no immediate heat or power saving.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention makes it possible to effectively use hot water that has been heated through a heat exchanger by an auxiliary heat source, depending on the state of use, as in the prior art. By not being able to use it, there is no danger of losing instantaneous heat or power saving, as long as there is hot water preheated by the auxiliary heat source, this hot water is always sent into the heating section without affecting the use condition, and the instantaneous heat is high. It is an object of the present invention to provide a water heater having a high function.

[0007]

According to a first aspect of the present invention, there is provided a power saving type immediate heating type electric water heater which divides a hot water storage tank into an upper hot water storage section, an intermediate auxiliary heating section, and a lower heating section. An upper separating plate and a lower separating plate, a hot water supply pipe connected to an upper part of the hot water storage part, and a water supply pipe connected to a lower part, a heat exchanger built in the auxiliary heating part, and a lower part of the auxiliary heating part A drain pipe connected to the heating section, a heater built in the heating section, a drain pipe connected to a lower section of the heating section, and a pipe arranged to send hot water from an upper portion of the heating section to an upper portion of the hot water storage section. A hot water pipe having a temperature sensing open / close valve attached to a lower end thereof, and an upper water pipe disposed to send water from a lower portion of the hot water storage section to a position below the heat exchanger in the auxiliary heating section. And the heater in the heating section from above the auxiliary heating section. To below the over, characterized by comprising a lower water conduit arranged to send hot water. According to a second aspect of the present invention, there is provided a power saving quick heating electric water heater according to the first aspect, wherein an air reservoir is formed on a lower surface of the upper separation plate and the lower separation plate. According to a third aspect of the present invention, there is provided a power-saving quick-heating electric water heater according to the first aspect, wherein the upper separation plate and the lower separation plate have a heat insulating structure using a material having high heat insulating properties. According to a fourth aspect of the present invention, there is provided a power saving type rapid heating electric water heater according to the first aspect, wherein the hot water pipe, the upper water pipe, and the lower water pipe are insulated. According to a fifth aspect of the present invention, there is provided a power saving type quick heating electric water heater according to the first aspect, wherein a heat reflecting plate is provided in an air reservoir of the upper separation plate and the lower separation plate.

According to the first aspect of the present invention, when the hot water is supplied, water is supplied to the lower portion in the hot water storage unit, and the hot water boiled in the heating unit is sent to the hot water storage unit. Then, the water is sent to the auxiliary heating unit by the upper water pipe, and is heated to warm water by the heat exchanger. Then, when the hot water boiled by the heating unit is sent to the hot water storage unit, the hot water in the auxiliary heating unit is sent to the heating unit by the lower water pipe, and is heated by the heater. In this way, the heater of the heating unit need only always be heated from warm water, and does not need to be heated from water, so that the heating speed is increased and power saving is improved. According to the second aspect of the present invention, since the air reservoir on the lower surface of the upper separation plate suppresses heat conduction from the hot water to the hot water, a decrease in the temperature of the hot water can be suppressed. In addition, since the air pocket on the lower surface of the lower separation plate suppresses the heat conduction from the hot water to the water, the temperature drop of the hot water can be suppressed, and as a result, the temperature difference between the hot water and the hot water surface does not increase, preventing the temperature drop of the hot water The hot water can be discharged for a long time. According to the third aspect of the present invention, since the heat insulating material on the lower surface of the upper separation plate suppresses heat conduction from the hot water to the hot water, a decrease in the temperature of the hot water can be suppressed. In addition, the heat insulating material on the lower surface of the lower separation plate suppresses heat conduction from hot water to water, so that the temperature drop of the hot water can be suppressed. As a result, the temperature difference between the hot water and the hot water surface does not increase, preventing the temperature drop of the hot water. The hot water can be discharged for a long time. According to the invention of claim 4, due to the heat insulation of the hot water pipe, when the hot water in the heating unit is supplied to the auxiliary heating unit or the lower part of the hot water storage unit while the hot water is sent to the hot water storage unit, heat may be conveyed. A small amount of water can be sent to the upper part of the hot water storage part, and the heat in the lower part of the hot water storage part can be flown into the lower part of the auxiliary heating part without neglected heat by the heat insulation of the upper water pipe. When the warm water in the upper part of the auxiliary heating part flows into the lower part of the heating part, the heat in the heating part can be reduced by the heat insulation of the lower water pipe. Therefore, the temperature of the hot water can be prevented from dropping, and the hot water can be discharged for a long time. According to the invention of claim 5, the heat reflection plate on the lower surface of the upper separation plate prevents radiant heat from the hot water to the hot water storage section, The heat insulating effect between the auxiliary heating units can be further enhanced. Further, the heat reflecting plate on the lower surface of the lower separating plate reflects the radiant heat from the high-temperature water in the heating unit to reduce the heat conduction to the auxiliary heating unit, thereby improving the boiling performance of the heating unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a power saving type quick heating electric water heater according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an auxiliary heating unit and a heating unit of FIG. 1, and FIG. It is an expanded sectional view around a valve. FIG. 4 is an explanatory diagram of a boiling operation in the water heater of FIG. 1, FIG. 5 is an explanatory diagram of a hot water supply operation, and FIG. 6 is a longitudinal sectional view of an electric water heater according to another embodiment of the present invention.

First, based on FIG. 1, the basic structure of the power-saving quick-heating electric water heater of the present embodiment will be described. The embodiment shown in FIG. 1 is an internal piping type water heater in which a hot water pipe 10 and upper and lower water pipes 7 </ b> A and 7 </ b> B are disposed inside the hot water storage tank 1.
In the figure, 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 plate 3. Hot water storage tank 1 is a cylindrical pressure vessel, and separates hot water storage tank 1 into upper hot water storage section 1A, intermediate auxiliary heating section 1B, and lower heating section 1C using upper separation plate 6A and lower separation plate 6B. . A water supply pipe 13 for supplying water is connected to a water supply port 17 on a side wall at the lower end of the hot water storage section 1A. The water supply pipe 13 is connected to a water pipe to supply water more than the water pressure of the water pipe. A pressure reducing valve for lowering the pressure and supplying water is provided, and a water supply pipe 13 is provided.
A rectifier 12 is installed in the immediate vicinity of the opening. A hot water supply port 23 is formed at the top of the hot water storage section 1A, and a hot water supply pipe 15 is connected to the hot water supply port 23 so that hot water in the hot water storage section 1A can be sent to a hot water tap.

A heater 5 for heating hot water in the heating unit 1C to hot water is disposed in a lower part of the heating unit 1C, and water supplied from a water supply pipe 13 is heated to a hot water in a lower part of the auxiliary heating unit 1B. A heat exchanger 41 is provided. Further, a drain pipe 73 is arranged below the auxiliary heating unit 1B. 10
Is a hot water pipe, which is disposed from the upper part of the hot water storage part 1A to the upper part of the heating part 1C, penetrating the upper separation plate 6A and the lower separation plate 6B. A temperature sensing on-off valve 11 is attached to the lower end of the hot water pipe 10. 7A is an upper water pipe, from the lower part of the hot water storage part 1A to the lower part of the auxiliary heating part 1B.
That is, it is disposed to penetrate the upper separation plate 6A to a position near the lower portion of the heat exchanger 41. Reference numeral 7B denotes a lower water pipe, which extends from the upper part of the auxiliary heating part 1B to the lower part of the heating part 1C, that is, near the lower part of the heater 5, through the lower separation plate 6B. Further, a drain pipe 7 is provided at the bottom of the hot water storage tank 1.
Although not shown, a thermostat, a relief valve, and an earth leakage circuit breaker are attached so that temperature control and safety are maintained.

The heat exchanger 41 transmits heat through a heat exchange pipe to a heat exchange pipe, and is connected to an auxiliary heat source 42. As the heat medium, any medium can be used without particular limitation as long as it is a fluid medium such as hot air, hot water, steam, or oil. Even if the water in the auxiliary heating section 1B is heated by the heat of the heat medium flowing in the heat exchanger 41 and does not reach hot water, the water is generated into low / medium-temperature hot water having a certain temperature, that is, hot water. As an energy source of the auxiliary heat source 42, in a factory, a hospital, or the like, it is preferable to use exhaust heat, steam, hot water, exhaust gas, and the like from existing boilers, generators, and various types of mechanical equipment because energy can be saved. If waste heat from power generation is used, cogeneration occurs.

The upper and lower water pipes 7A and 7B are preferably insulated by any method. As a method of heat insulation, the upper and lower water pipes 7A and 7B are made into a double structure with an outer pipe and an inner pipe, and an outer pipe,
Air is inserted between the inner pipes, a material with poor thermal conductivity is attached to the outer or inner circumference, a material with poor thermal conductivity is sandwiched by a metal plate, or a water pipe is made of a material with poor thermal conductivity. For example, urethane, ceramics, silicon, and the like are preferably used as the material having poor thermal conductivity. Further, it is preferable to insulate the hot water pipe 10 by any method. As a method of heat insulation, the hot water pipe 10 has a double structure of an outer pipe and an inner pipe, and air is interposed between the outer pipe and the inner pipe, or a material having poor heat conductivity is attached to the outer or inner circumference. Or a method of sandwiching a material having poor thermal conductivity with a metal plate, or a method of manufacturing the hot water pipe 10 with a material having poor thermal conductivity. Examples of the material having poor thermal conductivity include urethane, ceramics, and silicon. Is preferably used.

As shown in FIG. 2 and FIG.
Has a lower end protruding into the heating section 1C from the lower separation plate 6B, and a temperature sensing on-off valve 11 is attached to a lower end thereof.
The on-off valve 11 may be attached to the lower separation plate 6B, and the hot water pipe 10 may be attached to the separation plate 6B. In any case, the hot water must be sent to the hot water pipe 10 through the on-off valve 11. This temperature sensing on-off valve 11
Sensitive heating driving body 11a and valve body 11 which moves up and down by this
The heat-sensitive driving member 11a is made of a known material in which a wax and a piston which expand and contract in response to the ambient temperature and a piston are placed in a sensitive tube. Therefore, it is possible to open the valve at a predetermined temperature (for example, 90 degrees) upon sensing the temperature of the hot water of the heating unit 1C and close the valve at a temperature lower than that. An air vent hole 50 is formed in the outer casing of the temperature sensing on-off valve 11.
, A convection prevention valve 51 is inserted. This anti-convection valve 5
Numeral 1 is provided to draw air in the heating unit 1C into the hot water pipe 10, but to prevent hot water in the heating unit 1C from moving into the hot water pipe 10.

Further, the detailed structure of each part will be described with reference to FIGS. 1. In the heating section 1C (1) A structure in which the hot water pipe 10 is protruded from the lower separating plate 6B toward the heating section 1C to provide an air insulation section 30 When water is supplied to the hot water storage section 1A, it is assisted via the upper water pipe 7A. The heating part 1B is filled with water, and the water inside the heating part 1C rises from the lower part of the heating part 1C because water flows from the lower water pipe 7B, and the air in the heating part 1C is a convection prevention valve provided in the temperature sensing on-off valve 11. 51 is pushed up by air pressure, exits from the air vent hole 50 to the hot water pipe 10, and is discharged from the hot water supply pipe 15 through a relief valve or a faucet. The water surface gradually rises and the air vent hole 5
When it reaches the position of 0, the air above the air vent hole 50 does not escape, an air pocket is generated, and the air insulation part 30 is generated between the air and the lower separation plate 6B. Therefore, even when the heater 5 is energized and the inside of the heating section 1C is heated, the heat resistance of the air is high, and the heat transfer to the lower separation plate 6B is poor, so that the heating section 1
The warm water in C can be heated to a high temperature.

(2) The air insulation section 30 below the lower separation plate 6B
As described above, the heat insulating portion 30 generated between the heating portion 1C and the lower separation plate 6B provides heat insulation between the heating portion 1C and the lower separation plate 6B, and the inside of the heating portion 1C Although it is heated to a high temperature, when there is a high temperature part and a low temperature part, radiant heat is generated from the high temperature part to the low temperature part. In the heating section 1C, heat radiation is generated from the high-temperature water in the heating section 1C to the lower separation plate 6B. Therefore, a heat reflecting plate 31 is provided in the air heat insulating unit 30, and the radiant heat from the high-temperature hot water in the heating unit 1C is reflected by the heat reflecting plate 31, so that the heat transfer from the heating unit 1C to the lower separation plate 6B is further reduced. are doing. Therefore, the boiling performance in the heating section 1C can be improved, and the heating rate can be further increased.

(3) A structure in which the lower water pipe 7B protrudes below the lower surface of the heater 5. Heating of the heater 1C by the heater 5 starts, and the heater 1
When the temperature of the hot water in C becomes high, the temperature sensing on-off valve 11 opens, and the high-temperature hot water flows into the hot water pipe 10, the hot water simultaneously flows into the heating section 1C from the lower water pipe 7B. At this time, the temperature of the hot water in the heating unit 1C is higher than that of the flowing hot water, and the hot effect is better when hot water having a high density is placed below the high-temperature hot water.
When the hot water in the heating section 1C is heated by the heater 5, if the lower end of the lower water pipe 7B is above the heater 5, convection between the upper part in the heating section 1C and the inside of the auxiliary heating section 1B. The hot water cannot be sufficiently heated due to the action, but such inconvenience can be prevented.

(4) A structure in which the heater 5 is provided below the heating unit 1C The inside of the heating unit 1C is heated by the heater 5,
As the temperature of the water (hot water) near the heater 5 increases, the density decreases and rises. The low-temperature water (hot water) in the upper part has a large density and descends downward, flows after the raised water (hot water), is heated again, and rises. This convection action is repeated, so that the entire upper portion of the heater 5 is gradually heated from the lower portion. This means that convection does not occur on the lower surface of the heater 5 which is a heat source and the heater 5 is not heated.
For this reason, it is necessary to provide the heater 5 at the bottom in order to effectively boil the entire inside of the heating section 1C.

(5) Anti-convection valve 51 and air vent hole 50
When the heating in the heating section 1C by the heater 5 starts,
The heating unit 1C is heated and the temperature of water (hot water) in the hot water pipe 10 is increased.
When the temperature of the hot water in the inside rises, the hot water rises from the air vent hole 50 and enters the upper part of the hot water storage part 1A, and the water (hot water) below the hot water storage part 1A passes through the upper water pipe 7A and enters the lower part of the auxiliary heating part 1B, Water (hot water) in the upper part of the auxiliary heating part 1B has a convection effect of passing through the lower water pipe 7B and entering the lower part of the heating part 1C. In this case, the entire hot water storage tank 1 is gradually heated, and immediately loses heat. This is necessary to prevent this. The air vent hole 50 cannot supply water to the heating unit 1C unless the air in the heating unit 1C is discharged when the water is first supplied to the hot water storage tank 1 (particularly the heating unit), and the heating unit 1C is filled with water. It is necessary to make

2. In the auxiliary heating unit 1B (1) Structure in which the air control valve 52 is provided As shown in FIG. 2, an air control valve 52 is attached to the upper end of the auxiliary heating unit 1B. When the water supply starts at the time of initial water supply, water flows into the auxiliary heating unit 1B from the upper water pipe 7A, and the water surface rises and rises to the upper end of the lower water pipe 7B. And flows into the lower part of the heating unit 1C. When the inside of the heating section 1C is full and the water surface of the auxiliary heating section 1B reaches the upper end of the lower water pipe 7B, it becomes full of water.
The air inside must be exhausted. When the auxiliary heating section 1B is heated by reheating, the lower heating pipe 7B
If it is not slightly above the upper end of the port, it may not cause a circulation action, raise the water surface further from the above full condition,
In order to always maintain a constant water level (a constant water level above the upper end of the lower water pipe 7B), an air outlet is required. Also,
When the inside of the auxiliary heating unit 1B is heated by the heat exchanger 41 by the auxiliary heat source, the air separated from the water accumulates more than necessary, and a circulation action occurs when the upper end of the lower water pipe 7B is exposed from the water surface. It is necessary to discharge excess air so that the upper end of the lower water pipe 7B is always in hot water. Further, when the hot and cold water is discharged, the auxiliary heating unit 1
By causing the air to flow into B, effects such as increasing the drainage speed can be obtained. The air adjusting valve 52 has a function of discharging air but not discharging water when pressurized, and a known structure having a structure that sucks air when depressurized is used.

(2) The air insulation section 30 is provided below the upper separation plate 6A.
The method of providing the air insulation section 30 below the upper separation plate 6A is as follows.
By determining the position of the mounting pipe of the air regulating valve 52, the capacity of the air insulating section 30 can be set freely. Due to the heat insulation performance of the air heat insulating unit 30, the auxiliary heat source can prevent mutual heat dissipation to the hot water heated by the heat exchanger 41 and the hot water storage unit, thereby preventing the temperature of the hot water in the hot water storage unit or the hot water in the auxiliary heating unit from lowering.

(3) Connect the lower end of the upper water pipe 7A to the heat exchanger 41.
When water is sent from the lower part of the hot water storage unit 1A to the auxiliary heating unit 1B, low-temperature hot water (water) having a low temperature and a high density is supplied to the auxiliary heating unit 1.
B can flow into the bottom of the heat exchanger 4
1 increases the heating effect.

(4) The air insulation section 30 below the upper separation plate 6A
The inside of the auxiliary heating unit 1B is heated by the auxiliary heat source via the heat exchanger 41. After the hot water is used, the hot water storage unit 1 is heated.
At the bottom of A, cold water comes in. An air heat insulating portion 30 is provided between the hot water storage portion 1A and the auxiliary heating portion 1B, and a heat reflecting plate 31 is provided for more effective, though having heat insulating performance. The heat reflecting plate 31 has an effect of preventing radiant heat from the warm water heated through the heat exchanger 41 to the hot water storage section 1A, and further enhancing the heat insulating performance between the auxiliary heating section 1B and the hot water storage section 1A. .

(5) The upper end of the lower water pipe 7B is connected to the heat exchanger 41.
A structure projecting above the upper surface and below the surface of the hot water of the auxiliary heating unit 1B. The lower water pipe 7B has a function of sending warm water heated by the auxiliary heat source via the heat exchanger 41 to the heating unit 1C. The temperature of the heated water (hot water) is low in density and rises to the top. Therefore, in order to obtain hot water (water) at a high temperature, the upper end of the lower water pipe 7B needs to be near the hot water (water) surface in the auxiliary heating unit 1B. Similarly, the hot water (water) in the auxiliary heating unit 1B is heated by the heat exchanger 41, and the heated hot water (water) rises. It is better that the upper end port of the heat exchanger 41 protrudes from the upper surface of the heat exchanger 41.

(6) A structure in which the heat exchanger 41 is provided below the auxiliary heating unit 1B The water (hot water) in the auxiliary heating unit 1B is heated by the heat exchanger 41 and the temperature becomes high. The temperature rises and the convection action of the lower hot water (water) descends, so that the temperature inside the auxiliary heating unit 1B gradually increases.
Therefore, in order to uniformly boil the entire inside of the auxiliary heating unit 1B, it is more effective to provide the heat exchanger 41 as a heat source at the bottom.

3. A structure in which the water supply pipe 13 is provided at the bottom in the hot water storage section 1A and the shielding plate 12 is provided. When the boiling is completed, the entire hot water storage section 1A is hot water. After that, when hot water is used, cold water enters from the water supply pipe 13. Hot water having a high temperature also has a small increase in density, and cold water having a low temperature has a large decrease in density. Therefore, it is better in terms of thermal efficiency to store the high-density cold water supplied into the hot water storage section 1A as much as possible in the lower part of the hot water storage section 1A so as to push up hot water having a high temperature and a low density. Also, if cold water enters the hot water violently, the cold water will be mixed with the hot water and a large amount of hot water will be generated.However, in order to reduce the amount of hot water generated as much as possible, guide the cold water to the bottom of the hot water. The shield 12 is provided so as not to violently enter.

Next, the operation of the water heater according to the present embodiment will be described. [Water supply operation] Referring to FIGS.
The water supplied through 3 enters from the lower part of the hot water storage section 1A, is stored in the hot water storage section 1A, passes through the upper water pipe 7A, enters the auxiliary heating section 1B, and is stored. At this time, the air in the auxiliary heating section 1B is discharged from the air regulating valve 52, enters the heating section 1C via the lower water pipe 7B, and further passes through the hot water pipe 10 from the air vent hole 50, passes through the hot water pipe 15 to the outside. Is discharged. When the auxiliary heating unit 1B is filled, the supplied water passes through the lower water pipe 7B, flows into the lower part of the heating unit 1C, and makes the heating unit 1C full. On the other hand, the water is stored in the hot water storage section 1A.
The whole thing is satisfied.

[Heating Action] When the hot water storage tank 1 is completely filled, the heater 5 is energized and the hot water storage tank 1 starts boiling. Hereinafter, description will be made with reference to FIG. The water in the heating unit 1C is heated by the heater 5 and has a predetermined temperature (for example,
When heated to 90 ° C.), the temperature sensing on-off valve 11 opens, and the hot water HW in the heating section 1C passes through the hot water pipe 10 and is sent to the upper portion of the hot water storage to be stored. At the same time, the hot water above the upper end of the lower water pipe 7B in the auxiliary heating unit 1B flows through the lower water pipe 7B into the lower part of the heating unit 1C, and fills the hot water sent to the upper part of the hot water storage unit 1A. Heated by the heater 5.
After the warm water flowing into the heating unit 1C from the auxiliary heating unit 1B, the water at the lower part of the hot water storage unit 1A flows through the upper water pipe 7A to the lower part of the auxiliary heating unit 1B to supplement water. While repeating this operation, the hot water HW is stored in the hot water storage section 1A from above. The hot water boiled by the heating unit IC is an amount of hot water corresponding to the capacity of the heating unit 1C, and is sent to the hot water storage unit 1A through the temperature sensing on-off valve 11 that opens each time the temperature rises to a predetermined high temperature. Hot water is intermittently sent to hot water storage section 1A. a to f show the hot water HW stored in such a manner. The auxiliary heating unit 1B keeps the cold water state even when the hot water storage unit 1A is heated. The auxiliary heating unit 1B is heated by transferring the heat of the auxiliary heat source 42 by the heat exchanger 41. The auxiliary heat source 42 may use solar energy, waste heat, oil drain, exhaust gas, steam, and the like. If the cold water is heated by the heat exchanger 41, it is sent to the heating unit 1C later, and when heated by the heater 5, it is quickly boiled into hot water.

[Hot water supply operation] As shown in FIG.
The hot water is stored in A, the hot water is stored in the auxiliary heating section 1B, and when the faucet connected to the hot water supply pipe 15 is opened to make hot water come out, the hot water is supplied from the water supply pipe 13 connected to the water pipe. Water is supplied to the lower portion of 1A, and the water pushes up the hot water in the upper portion, so that the hot water flows out of the faucet due to the pressure. When the faucet is closed, there is no hot water outlet, so stop supplying water. This operation is repeated every time the hot water is discharged, and a state in which a part of the hot water in the hot water storage tank 1 is used is a state shown in FIG. In this state, hot water HW is stored above hot water storage unit 1A, and water W is stored below.

[Reheating Operation] As shown in FIG. 5, when reheating starts from a state in which water W is stored in the lower portion of the hot water storage section 1A, the hot water (water) in the heating section 1C is heated by the heater 5. When the temperature reaches a predetermined temperature, the temperature sensing on-off valve 11 opens,
The hot water of the heating unit 1C is sent to the upper part of the hot water storage unit 1A via the hot water pipe 10 and stored. The cold water W in the lower part of the hot water storage part 1A flows into the lower part of the auxiliary heating part 1B via the upper water pipe 7A, and pushes up the hot water MW in the upper part. The pushed-up hot water MW flows into the lower part of the heating unit 1C via the lower water pipe 7B. Then, the hot water HW heated by the heater 5 and sent to the hot water storage section 1A via the hot water pipe 10 is filled. Heating unit 1
When the temperature of the hot water MW in C reaches a predetermined high temperature, the temperature sensing on-off valve 1
1 is opened and sent to the upper part of hot water storage part 1A through hot water pipe 10. Then, the amount of hot water HW has increased and the hot water storage section 1A
The water W in the inside is pushed down, passes through the upper water pipe 7A, and is sent to the lower part in the auxiliary heating unit 1B. Then the auxiliary heating unit 1
The warm water in the upper part of B passes through the lower water pipe 7B and is sent into the heating unit 1C. And the heater 5 will boil hot water to hot water in the heating part 1C. By repeating this action, the inside of the hot water storage section 1A can be heated to hot water, and only the required amount can be heated by stopping additional cooking. In the present invention, when reheating is performed in this manner, the water is heated to warm water in the auxiliary heating unit 1B and then sent to the heating unit 1C, so that the heater 5 can boil the hot water to hot water, As compared with the case of boiling water from hot water, the water can be heated quickly and the power consumption can be reduced. Further, the auxiliary heating unit 1B can store hot water surrounded by the upper and lower separation plates 6A and 6B. Depending on the arrangement position of the upper and lower water guide pipes 7A and 7B, the auxiliary heating unit 1B has a heating unit as long as there is hot water MW in the auxiliary heating unit 1B. 1C
Is supplied with only hot water. For this reason, since cold water is not supplied to the heating unit 1C,
As mentioned above, boiling at the time of reheating will be performed early.

[Drainage Action] When the hot water in the hot water storage tank 1 or the water needs to be drained (hot water), the faucet is opened or a relief valve provided in the hot water supply pipe 15 (to release the pressure rise in the hot water storage tank 1). The safety valve is opened to allow air to flow into the hot water storage section 1A. Then, when the drain valve attached to the drain pipe 73 is opened, the water in the hot water storage section 1A flows into the auxiliary heating section 1C via the upper water pipe 7A, and is discharged from the lower part of the auxiliary heating section 1B.
Is discharged through. At the same time, drainage (hot water) in the auxiliary heating section 1B is also possible. The drainage (hot water) in the heating section 1C starts from the drainage (hot water) in the auxiliary heating section 1B, and the lower drainage pipe 7B
If the upper port of the water pipe projects from the water (hot water) surface, air can flow into the heating section 1C through the lower water pipe 7B, so that the drain water (hot water) starts from the lower drain pipe 73.

The water heater shown in FIG. 6 is an external piping type embodiment in which a hot water pipe 10 and upper and lower water pipes 7A and 7B are arranged outside the hot water storage tank 1. That is, the hot water pipe 10 is piped outside the tank 1 from the upper part of the heating part 1C to the upper part of the hot water storage part 1A. The upper water pipe 7A is provided outside the tank 1 from the lower part of the hot water storage part 1A to the lower part of the auxiliary heating part 1B, and the lower water pipe 7B is connected to the tank 1 from the upper part of the auxiliary heating part 1B to the lower part of the heating part 1C. It is plumbed through outside. Other configurations are substantially the same as those in the embodiment of FIG. 1, and therefore, the same members are denoted by the same reference numerals and description thereof will be omitted. The present invention can also be applied to such an externally-pipe type water heater, in which the heater 5 in the heating section 1C is always supplied with the warm water heated in the auxiliary heating section 1A, and the boiling water to the hot water is supplied. This has the effect that the lifting can be performed quickly.

[0033]

According to the first aspect of the present invention, when the hot water is supplied, water is supplied to the lower portion in the hot water storage portion, and the hot water boiled in the heating portion is supplied to the hot water storage portion. When it is sent, it is sent to the auxiliary heating section by the upper water pipe, and the auxiliary heat source in the auxiliary heating section pushes up the heated hot water through the heat exchanger, and the pushed hot water passes through the lower water pipe to the heating section. It is sent and heated by a heater. In this way, the heater of the heating unit does not need to be heated from water, but only needs to be heated from warm water.
The heating speed is increased and the power saving is improved. According to the invention of claim 2, the lower air pool of the upper separation plate suppresses heat transfer due to a temperature difference between the hot water storage unit and the auxiliary heating unit, and the lower air pool of the lower separation plate is heated by the auxiliary heating unit and the auxiliary heating unit. Heat transfer due to a temperature difference between the sections can be suppressed, and the temperatures of the hot water storage section, the auxiliary heating section, and the heating section can be maintained. According to the invention of claim 3, the lower air pool of the upper separation plate suppresses heat transfer due to a temperature difference between the hot water storage unit and the auxiliary heating unit, and the lower air pool of the lower separation plate is
Heat transfer due to a temperature difference between the auxiliary heating unit and the heating unit can be suppressed, and the temperatures of the hot water storage unit, the auxiliary heating unit, and the heating unit can be maintained.
According to the fourth aspect of the present invention, when the cold water in the lower part of the hot water storage unit flows into the lower part of the auxiliary heating unit due to the heat insulation of the upper water pipe, heat is supplied from the hot water in the auxiliary heating unit heated through the heat exchanger by the auxiliary heat source. The insulation of the lower water pipe suppresses the heat in the heating unit when hot water in the auxiliary heating unit flows into the lower part of the heating unit.
According to the invention of claim 5, the lower air pool of the upper upper separating plate suppresses heat transfer due to a temperature difference between the hot water storage unit and the auxiliary heating unit, and the lower air pool of the lower separating plate is provided with the auxiliary heating unit. Heat transfer due to a temperature difference between the heating units can be suppressed, and the temperatures of the hot water storage unit, the auxiliary heating unit, and the heating unit can be maintained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a power-saving quick-heating electric water heater according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an auxiliary heating unit and a heating unit of FIG.

FIG. 3 is an enlarged sectional view around a temperature sensing on-off valve of FIG. 1;

FIG. 4 is an explanatory diagram of a boiling operation in the water heater of FIG. 1;

FIG. 5 is an explanatory diagram of a hot water supply operation.

FIG. 6 is a longitudinal sectional view of an electric water heater according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a water heater of Conventional Example 1.

FIG. 8 is an explanatory diagram of a boiling action of Conventional Example 1.

FIG. 9 is an explanatory diagram of a problem of Conventional Example 1.

FIG. 10 is an explanatory view of a water heater of Conventional Example 2.

FIG. 11 is an explanatory diagram of a boiling action of Conventional Example 2.

FIG. 12 is an explanatory diagram of a problem of Conventional Example 2.

FIG. 13 is a cross-sectional view of a water heater of Conventional Example 3.

FIG. 14 is an explanatory diagram of a boiling action of Conventional Example 3.

FIG. 15 is an explanatory diagram of a problem of Conventional Example 3.

[Explanation of symbols]

 Reference Signs List 1A Hot water storage unit 1B Auxiliary heating unit 1C Heating unit 5 Heater 6A Separator plate 6B Separator plate 7A Water pipe 7B Water pipe 10 Hot water pipe 11 Temperature sensing on-off valve 41 Heat exchanger

Claims (5)

[Claims] 1. A hot water storage tank, an upper separation plate and a lower separation plate for dividing the hot water storage tank into an upper hot water storage portion, an intermediate auxiliary heating portion, and a lower heating portion, and are connected to an upper portion of the hot water storage portion. A hot water supply pipe, and a water supply pipe connected to a lower part, a heat exchanger built in the auxiliary heating part, a drain pipe connected to a lower part of the auxiliary heating part, and a heater built in the heating part, A drain pipe connected to a lower part of the heating part, a hot water pipe arranged to send hot water from an upper part of the heating part to an upper part of the hot water storage part, and a temperature sensing open / close valve attached to a lower end thereof; An upper water pipe arranged to send water from a lower portion of the hot water storage portion to a portion below the heat exchanger in the auxiliary heating portion, and from an upper portion of the auxiliary heating portion to a portion below the heater in the heating portion. With a lower drainage pipe arranged to send hot water Power-saving immediate thermal electric water heater, characterized in that Ranaru. 2. The electric water heater according to claim 1, wherein air reservoirs are formed on the lower surfaces of said upper and lower separation plates. 3. The electric water heater of claim 1, wherein the upper and lower separators have a heat insulating structure using a material having high heat insulating properties. 4. The electric water heater of claim 1, wherein the hot water pipe, the upper water pipe, and the lower water pipe are insulated. 5. The electric water heater according to claim 2, wherein a heat reflecting plate is provided in an air reservoir of the upper separating plate and the lower separating plate.