JPH0727421A - Electric hot water heater - Google Patents

Abstract

PURPOSE:To reduce costs and prevent the amount of hot water supplied through a hot water supply hole from being restricted by making it possible to supply high temperature hot water through the hot water supply hole even if the amount of the hot water held in the upper part of a thermally insulated reservoir of an electric hot water heater becomes small and omitting a pressure reducing valve. CONSTITUTION:When hot water 13 is used, cold water 14 flows with a rush through a water supply hole 7. A heat insulating means 8A having a specific gravity smaller than that of the cold water 14 and greater than that of the hot water 13 is provided between the hot water 13 held in the upper part of a thermally insulated reservoir 2 and the cold water 14 held in the lower part of the thermally insulated reservoir 2. Even if the amount of the hot water 13 held in the upper part of the thermally insulated reservoir 2 becomes small, regardless of water flow, the high temperature hot water 13 can be supplied through a hot water supply hole 6 without being restricted by a pressure reducing valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater that uses late-night power.

[0002]

2. Description of the Related Art Electric water heaters use hot water at midnight to produce hot water, and store the hot water in a heat insulation container to store it in the kitchen, washroom,
Hot water is supplied to bathrooms. The upper surface and the side surface of the warm water in the heat retaining container are kept warm by the heat retaining container, and the lower surface is thermally separated from the cold water by the mixed layer of the warm water and the cold water existing above the cold water in the lower portion of the heat retaining container.

[0003]

However, when hot water is used, the cold water flowing from the water supply port is depressurized by passing through the pressure reducing valve, but a water flow still occurs in the heat retaining container, so that the mixing layer Gradually expands, and as hot water is used, high-temperature hot water cannot be supplied from the hot water supply port, and since a pressure reducing valve is used, the cost is high and the amount of hot water supplied from the hot water supply port is also high. There was a problem that it was limited.

The present invention makes it possible to supply high-temperature hot water from the hot water inlet even when the amount of hot water in the upper part of the heat-insulating container becomes small, and to reduce the cost by omitting the pressure reducing valve.
It is an object to prevent the amount of hot water supplied from the hot water supply port from being limited.

[0005]

In order to solve the above-mentioned problems, the present invention provides a heat-retaining container, a heater provided at the bottom of the heat-retaining container for heating cold water stored in the heat-retaining container, and a heater. An electric water heater comprising a temperature controller for adjusting the temperature of cold water to be heated to a predetermined temperature, a hot water supply port provided at an upper part of the heat insulation container, and a water supply port provided at a lower part of the heat insulation container. In addition, a heat insulating means that can move up and down and is smaller than the specific gravity of cold water and larger than the specific gravity of hot water is provided inside the heat retaining container.

[0006]

[Function] When hot water is used, cold water flows in from the water supply port vigorously, and even if a water flow occurs, it is smaller than the specific gravity of the cold water between the hot water in the upper part of the heat retaining container and the cold water in the lower part of the heat retaining container. Since the heat insulating means having a larger specific gravity exists, even when the amount of hot water in the upper part of the heat retaining container is small, high temperature hot water can be supplied from the hot water inlet without being restricted by the pressure reducing valve.

[0007]

1 and 2 are an overall cross-sectional view and an upper cross-sectional view of an electric water heater according to an embodiment of the present invention, respectively.

In the figure, reference numeral 1 is a cross section of the entire electric water heater, 2 is a heat retaining container, 3 is an inner case of the heat retaining container 2, 4 is an outer case of the heat retaining container 2, and 5 is an inner case 3.
And a heat insulating material filled inside the outer case 4, 6 is a hot water supply port provided in the upper part of the heat insulation container 2, 7 is a water supply port provided in the lower part of the heat insulation container 2, and 8A is provided in the heat insulation container 2. Insulation means that can be moved up and down and that is smaller than the specific gravity of cold water and greater than the specific gravity of hot water, 9 is the envelope of the heat insulating means 8A, 10 is a heat insulating material filled inside the envelope 9, and 11 and 12 are respectively heat insulating Heat insulating means 8A provided in the container 2 and the heat insulating means 8A
Rotation stop, 13 is hot water stored in the space above the heat insulation container 2 and the heat insulation means 8A, and 14 is the heat insulation container 2 and the heat insulation means 8A.
Cold water stored in the space below A, 15 is a heater for heating the cold water 14 provided at the bottom of the heat insulation container 2, and 16 is a heater 15 when the heat insulating means 8A moves up and down in the heat insulation container 2.
U-shaped groove 17 for preventing contact with the heater 15
The temperature controller 18 adjusts the temperature of the cold water 14 heated at a predetermined temperature, 18 is the temperature controller 17 and the commercial power source 1
It is a switch connected between the nine.

When the switch 18 is closed at midnight, electric power is supplied from the commercial power source 19 to the heater 15 via the temperature controller 17. The temperature of the cold water 14 is the heater 15
Rises due to the energization of the cold water 14 and the specific gravity of the cold water 14 is increased by the heat insulating means 8A.
When the specific gravity becomes smaller than the specific gravity, the heat insulating means 8A located between the hot water 13 and the cold water 14 in the heat retaining container 2 moves to the bottom portion in the heat retaining container 2. When the temperature of the cold water 14 reaches a predetermined temperature by the temperature controller 17, the energization of the heater 15 is stopped.

When the hot water 13 flows out from the hot water supply port 6, the cold water 14 flows into the heat insulation container 2 from the water supply port 7. Cold water 14
Temperature is, for example, 20 ° C, the temperature of hot water 13 is, for example, 80 ° C
Assuming that the specific gravity of water at 4 ° C. is 1, the respective specific gravities are about 0.998 and about 0.972. Heat insulation means 8
If the specific gravity of A is 0.985, for example, the specific gravity of the heat insulating means 8A is smaller than the specific gravity of the cold water 14 and larger than the specific gravity of the hot water 13, so the insulating means 8A floats between the hot water 13 and the cold water 14.

The heat insulating means 8A has a diameter of 60 cm and a height of 3
cm, the volume is about 8482 cubic cm, so
The moving force of the heat insulating means 8A in the vertical direction (buoyancy when the heat insulating means 8A is in the cold water 14) has a difference in specific gravity of 0.013, and therefore is 8482 cubic cm × 0.013 = 110 g. As the cold water 14 flows from the water supply port 7 into the heat insulating container 2, the heat insulating means 8A receives the moving force and receives heat from the heat insulating container 2
You can move inside.

Further, due to the detents 11 and 12 provided in the heat insulating container 2 and the heat insulating means 8A, respectively, the heat insulating means 8A does not rotate with respect to the horizontal plane, but is insulated by the U-shaped groove 16 provided in the heat insulating means 8A. The means 8A moves in the heat insulating container 2 without contacting the heater 15.

Inner case 3 and outer case 4 of the heat insulation container 2
If at least the inner case 3 and the envelope 9 of the heat insulating means 8A are made of the same material, such as stainless steel, the coefficient of thermal expansion becomes the same, and the inner diameter of the inner case 3 of the heat insulating container 2 and the outside of the heat insulating means 8A. The difference in diameter can be made small, and the inside of the envelope 9 is filled with the heat insulating material 10 such as foamed plastic, so that the heat of the hot water 13 is the cold water 1.
It is possible to make it difficult to reach 4.

FIG. 3 is a cross-sectional view of a portion showing a modification of the heat insulating means of the embodiment shown in FIG.

In the figure, the same or corresponding parts as in FIG. 1 are designated by the same reference numerals. Reference numeral 20 is a bolt for fixing the heat insulating means 8A, and 21 is a concave portion provided in the heat insulating means 8A. The bolt 20 is screwed into the concave portion 21 when the electric water heater 1 is transported, and then fixed by the loosening prevention nut 22. When installing the electric water heater 1, after loosening the lock nut 22, the bolt 20 is removed from the electric water heater 1, and a waterproof bolt (not shown) is screwed into the portion where the bolt 20 has been screwed in for waterproofing. You can do it like this. In addition to the illustration, if two sets of bolts 20, recesses 21, and nuts 22 are provided separately, the electric water heater 1
The heat insulating means 8A can be completely fixed during transportation. Reference numeral 23 denotes a handle, which can be used for suspending when the heat insulating means 8A is inserted into the inner case 3 of the heat insulating container 2.

FIG. 4 is an overall sectional view of an electric water heater 1 according to another embodiment of the present invention.

In the figure, the same or corresponding parts as those in FIG. 1 are designated by the same reference numerals. Reference numeral 8B is a heat insulating means, which has the same specific gravity as that of the embodiment of FIG. 1, but has a plurality of heat insulating balls unlike the case of FIG. In this embodiment, the heat insulating sphere 8
When the diameter of B is small, the heat insulation of the hot water 13 and the cold water 14 can be improved as compared with the embodiment of FIG.

[0018]

According to the present invention, when hot water is used, cold water vigorously flows in from the water supply port, and even if a water flow occurs, between the upper hot water in the heat retaining container and the lower cold water in the heat retaining container. ,
Due to the presence of the heat insulating means, even when the amount of hot water in the upper part of the heat insulating container becomes small, high temperature hot water can be supplied from the hot water supply port without being restricted by the pressure reducing valve. Moreover, since no pressure reducing valve is used, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an entire electric water heater showing an embodiment of the present invention.

FIG. 2 is a top sectional view of a portion of the electric water heater of the embodiment of FIG.

3 is a cross-sectional view of a portion showing a modified example of the heat insulating means of the embodiment of FIG.

FIG. 4 is a sectional view of an entire electric water heater showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric water heater 2 Heat insulation container 3 Inner case 4 Outer case 5 Heat insulating material 6 Hot water inlet 7 Water inlet 8A, 8B Heat insulating means 9 Enclosure 10 Heat insulating material 15 Heater 17 Temperature controller 18 Switch

Claims (1)

[Claims] 1. A heat retaining container, and a heater provided at the bottom of the heat retaining container for heating cold water stored inside the heat retaining container,
An electric water heater including a temperature controller for adjusting the temperature of cold water heated by a heater to a predetermined temperature, a hot water supply port provided at the upper part of the heat retaining container, and a water supply port provided at the lower part of the heat retaining container. In the above, the electric water heater is characterized in that it is provided with a heat insulating means which is vertically movable inside the heat insulation container and is smaller than the specific gravity of the cold water and larger than the specific gravity of the hot water.