JP3489246B2 - 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 the exterior of an electric water heater that heats hot water with an electric heat source.

[0002]

2. Description of the Related Art Conventionally, there is an electric water heater as shown in FIG. In FIG. 2, the hot water storage tank 1 has a hot water supply port 2 on the upper side, a water supply port 3 on the lower side, a heater flange 4 on the side surface, and a plurality of legs 5 on the outer peripheral portion. The heater 6 is fixed to the heater flange 4 with a screw through a packing 7 and a temperature controller 8
Attached and covered with a heater cover 9. Hot water storage tank 1
Is self-supporting by being fixed to the bottom plate 10 by a plurality of legs 5. The hot water storage tank 1 is entirely covered with a heat insulating material 11, and further has exteriors such as a side plate 12 and an upper plate 13 on the outside. Water inlet 3 is water pipe 1
4, and the hot water supply port 2 is connected to a hot water supply tap 16 via a hot water supply pipe 15. In the above configuration, the hot water is constantly stored in the hot water storage tank 1 by the heater 6. When the hot water tap 16 is opened, this hot water comes out of the hot water tap 16. When the temperature of the hot water in the hot water storage tank 1 is lowered in this way, the heater 6 is energized by the temperature controller 8 and the hot water is boiled again.

[0003]

In such a conventional electric water heater, the hot water storage tank 1 is provided with legs for self-standing, and the whole is covered with the heat insulating material 11, and the outside is further provided with the side plate 12 and the upper plate 13. Since it was covered with such an exterior, there were the following drawbacks.

(1) The glass wool used as the heat insulating material 11 scatters around the product when it is assembled, which adversely affects the human body of the worker.

(2) In addition to the heat insulating material 11, the side plate 12, the upper plate 13 and the like must be attached to the exterior, so that the cost of parts is high. In addition, the large number of parts deteriorates the assemblability.

(3) If the vinyl chloride steel plates used as the exteriors of the side plates 12, the upper plate 13 or the like are intentionally or accidentally damaged, rust will be generated due to moisture or the like after long-term use, resulting in poor appearance. Was occurring. In addition, the use of PVC steel sheets resulted in an increase in product weight.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide an electric water heater having a structure in which a heat-resistant foamed heat insulating material is attached to the outer shell of a hot water storage tank also as an exterior.

[0008]

Means for Solving the Problems The present invention to achieve the above object, the water inlet and discharge water in the lower part has a hot water outlet at the top
A hot water storage tank mouth was placed, the heater incorporated in the hot water storage tank, and the heat-resistant foam insulation that is exterior material covering the hot water tank shell, the heat of the foam insulation to pressure retained in the hot water storage tank The film of the above, the heat-resistant foam insulation of the lower part of the hot water storage tank
A part of the space is provided on the contact surface with the material .

The heat-resistant foamed heat insulating material and the film also serve as an exterior plate and a heat insulating material, and are made of a flame-retardant material.

[0010]

The function of the book is that the heat-resistant foamed heat insulating material is attached to the outer wall of the hot water storage tank also as an exterior by the above-mentioned structure.
In addition to being able to provide an inexpensive electric water heater by reducing the number of parts and weight and improving the assemblability ,
Even if water leaks from the hot water storage tank, water leaks to the floor, etc.
Can be prevented .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an electric water heater according to an embodiment of the present invention. In the figure, the hot water storage tank 17 has a hot water supply port 18 in the upper part, and a water supply port 19 and a drain port 20 in the lower part. The water supply port 19 is connected to a water supply pipe 21, and the hot water supply port 18 is connected to a hot water supply tap 23 via a hot water supply pipe 22.

The heater 24 is a sheathed heater, the flange portion of which is fixed to the outer wall of the hot water storage tank 17 with screws, and the heater portion is fixed to the hot water storage tank 17
Is inserted inside. A drain plug 25 with a pressure relief valve is connected to the drain port 20 with a screw. And the hot water tank 17
The surface of is covered with a heat resistant foam insulation 26. As shown in the figure, the heat-resistant foam insulating material 26 is divided into left and right parts, and the fitting portion has a concavo-convex shape for easy and reliable fitting. The heat-resistant foamed heat insulating material 26 has legs integrally formed, and the heat-resistant foamed heat insulating material 26 has a structure in which the bottom surface of the electric water heater and the installation surface are not in surface contact but only in part. In addition, the contact surface of the heat-resistant foam insulating material 26 with the lower part of the hot water storage tank 17 is partially provided with a space. Further, a heat-resistant and flame-retardant decorative film 27 is attached to the entire outer surface of the heat-resistant foamed heat insulating material 26. Here, the heater 24 may be fixed to the hot water storage tank 17 by a stud bolt.

In the above construction, the water supplied to the inside of the hot water storage tank 17 through the water supply port 19 is heated to a high temperature by energizing the heater 24 to heat it. Then, the heater 24 is energized and controlled by the temperature controller 28 on the flange of the heater 24 so that the temperature of the hot water becomes constant. Since the heat transfer of the high heat of the hot water storage tank 17 is reduced by the heat-resistant foamed heat insulating material 26, even if a person touches the heat-resistant flame-retardant decorative film 27, there is no danger of causing a dangerous state such as a burn. In addition, since the floor contact surface of the installation is configured to float above the floor except for the legs, heat transfer to the floor can be prevented. further,
Since a space is provided on the contact surface of the heat-resistant foam insulating material 26 with the lower part of the hot water storage tank 17, even if water leaks from the hot water storage tank, damage to the floor surface etc. can be prevented to some extent. it can. As described above, according to the electric water heater of the embodiment of the present invention, the hot water storage tank 17 can be fixed with the heat-resistant foam insulating material 26 without using a plurality of legs that are conventionally fixed to the hot water storage tank 17. Can be self-reliant. Further, since it can be configured without using the vinyl chloride steel plate or the like used as the exterior 13, it is possible to reduce the number of parts and the weight.

[0014]

As is apparent from the above embodiments, according to the present invention, the following effects can be obtained.

1. By using the heat-resistant foam insulation material, the structure can be formed without using the glass wool which has been conventionally used as the insulation material, and therefore there is no fear that the human body of a product assembly worker is adversely affected and it is safe.

2. By using heat-resistant foam insulation, in addition to insulation, exterior parts such as side plates and upper plates are abolished.
Furthermore, since the legs of the hot water storage tank are unnecessary, it is possible to reduce the cost of parts and the number of assembly steps.

3. Spot welding of legs for self-supporting the hot water storage tank can be completely eliminated, and welding man-hours can be significantly reduced. In addition, since the spot welds that easily corrode are eliminated, the quality of the hot water storage tank can be secured for a long period of time.

4. Since the vinyl chloride steel plate that has been conventionally used as an exterior part is unnecessary, rust due to scratches and the like is eliminated, and there is no fear that the appearance will deteriorate. In addition, the product weight can be reduced.

5. Installation of electric water heater Since the part of the floor contacting surface floats above the floor, heat transfer to the floor can be reduced.

6. Even if water leaks from the hot water storage tank, it prevents expansion damage due to water leaks to the floor surface, etc., because part of the space is provided on the contact surface of the heat resistant foam insulation with the bottom of the hot water storage tank. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric water heater according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional electric water heater.

[Explanation of symbols]

17 Hot water storage tank 18 Hot water supply port 19 water inlet 20 drain 24 heater 26 Heat-resistant foam insulation 27 Heat-resistant flame-retardant decorative film

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-18054 (JP, A) JP-A-3-191168 (JP, A) JP-A-3-275476 (JP, A) Actual development Sho-62- 45640 (JP, U) Actually open 61-197447 (JP, U) Actually open 3-10160 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24H 9/00 F24H 1 / 18

Claims (2)

(57) [Claims] 1. A hot water storage tank having a hot water supply port in the upper part and a water supply port and a drainage port in the lower part, a heater, and an exterior material for covering the outer shell of the hot water storage tank, and heat insulation of the hot water storage tank. A heat-resistant foam heat insulating material for holding and a film for holding this heat-resistant foam heat insulating material in pressure contact with a hot water storage tank are provided.
An electric water heater having a structure in which a partial space is provided on the contact surface with the heat-resistant foam insulation material in the lower part of the tank . 2. The bottom surface of the heat-resistant foam insulation material is an installation surface and a part.
The electric water heater according to claim 1, wherein the electric water heater has a leg portion that comes into contact with each other .