JP3282323B2 - Hot 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 an instant hot water device for supplying hot water as soon as a hot water tap is opened by an electric heat source.

[0002]

2. Description of the Related Art Conventionally, there is an apparatus as shown in FIG. 3 as a hot water heater provided in the middle of a pipe between a water heater and a hot water tap. In FIG. 3, a hot water supply port 2 is provided at an upper portion of a hot water storage tank 1, a water supply port 3 is provided at a lower portion, a heater flange 4 is provided on a side surface, and a plurality of legs 5 are provided on an outer peripheral portion.
There is. The heater 6 is fixed to the heater flange 4 with screws via a packing 7, a temperature controller 8 is attached, and the heater 6 is covered with a heater cover.

The hot water storage tank 1 is fixed to a bottom plate 9 by a plurality of legs 5 and is free standing. The hot water storage tank 1 is entirely covered with a heat insulating material 10 and further has exteriors such as a side plate 11 and an upper plate 12 on the outside.

An inlet 13 at an upper portion of the hot water storage tank 1 is connected to a water heater 14 and an outlet 15 is connected to a hot water tap 16 by piping.

In the above configuration, hot water is always stored in the hot water tank 1 by the heater 6. When the hot water tap 16 is opened, the hot water mixes with the water supply and flows out of the hot water tap 16 as hot water of an appropriate temperature. Water to be cooled in the pipe from the water heater 14 enters the hot water storage tank 1 through the lower water supply port 3. By the time the hot water in the hot water storage tank 1 is exhausted, the hot water boiled from the water heater 14 reaches the inlet 13, so that the hot water can be continuously used.
When the temperature of the hot water in the hot water storage tank 1 drops, the heater 6 is energized by the temperature controller 8 and the hot water is again heated to a high temperature.

[0006]

In such a conventional hot water heater, since the legs 5 are attached to the side surface of the hot water storage tank 1 by welding, there are the following problems.

(1) The welding of the legs 5 is, for example, 4
The number of welding spots was more than 12 points, and a total of 12 welding points or more was required for three legs, resulting in high processing cost.

(2) The hot water storage tank 1 cannot stand alone unless the number of legs 5 is at least three. For this reason, the component cost of the leg 5 is also high.

(3) In some cases, the bottom surfaces of the legs 5 may not be aligned on a horizontal plane, and the hot water storage tank 1 may not fit vertically into the through-hole of the upper plate 12 and may not be assembled because the water storage tank 1 is tilted slightly. This causes the assemblability to deteriorate.

(4) The passivation film on the inner surface of the spot welded portion in the stainless steel hot water storage tank 1 is broken and oxidized, so that corrosion due to water is apt to occur, which causes perforation.

An object of the present invention is to solve the above-mentioned drawbacks, and an object of the present invention is to provide a hot water heater having a structure in which a heater is attached to a bottom plate of a hot water storage tank so that the hot water storage tank is properly self-standing.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a hot water storage having a water supply port at an upper part and a drainage port at a lower part.
A tank, a heater unit attached to the bottom of the hot water storage tank,
Attach a drain plug horizontally connected to the drain port with a screw
A drain pipe which can be attached to the bottom of the drain pipe.
It has a screw part, and the bottom plate is fixed to this screw part
It is configured to support a hot water storage tank.

The drain pipe is fastened with screws between a bottom plate and a bottom plate via a disk-shaped heat insulating material made of a flame-retardant material.

[0014]

According to the present invention, by attaching the drain port and the drain pipe of the hot water tank to the bottom plate, the hot water tank can be properly self-standing without using dedicated legs.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are configuration diagrams of a hot water heater according to one embodiment of the present invention. In the figure, a water supply port 18 is provided at an upper portion on a central axis of a hot water storage tank 17 and a drainage port 19 is provided at a lower portion. Drain 19
Is located at the center of the hot water storage tank 17, and has a screw for fitting with the fixing nut 20 on the outer periphery, and a screw for fitting with the drain pipe 21 on the inner periphery.

The heater unit 22 includes an electric heater 23.
The upper surface of the heat transfer body 24 is formed of a substantially disk-shaped aluminum alloy having substantially the same shape as the bottom surface of the hot water storage tank 17 and having a groove on the lower surface for mounting the electric heater 23. The electric heater 23 is a cylindrical rod-shaped sheathed heater that is press-fitted into a groove of the heat transfer body 24 and is mounted with good heat conduction.

At the center of the heat transfer body 24 thus formed, a hole through which the drain port 19 of the hot water storage tank 17 penetrates is provided.

The heater unit 22 is inserted into the drain port 19 of the hot water storage tank 17 and is attached to the bottom surface of the hot water storage tank 17 with a fixing nut 20 via a disk-shaped heat insulating material 25 made of a flame-retardant material. ing.

A drain pipe 21 is connected to the inner diameter of the drain port 19 with a screw. Furthermore, the drain pipe 21 has a threaded portion 2 on the bottom.
6 and a heat insulating material 28 from the lower surface in the hole at the center of the bottom plate 27.
By fixing with screws 29 through the hot water tank 17, the hot water storage tank 17 has a structure that can stand alone without legs. Drain pipe 21
A pipe 31 for attaching a drain plug 30 is connected in the horizontal direction.

The water supply joint is connected to the inlet 3 connected to the water heater 14.
2 and an outlet 33 connected to the hot water supply tap 16 and a connection port 34 connected to the water supply port 18 of the hot water storage tank 17 are provided. A water supply passage 35 from the inlet 32 communicates with a water supply pipe 36 extending to the bottom of the hot water storage tank 17 and a bypass passage 37 connected to the outlet 33. Hot water supply passage 3 communicating with outlet 33
8 is provided in parallel with the bypass passage 37.

Here, the heater unit 22 is an electric heater 2
3 may be constituted by a cast heater which is cast integrally with a heat transfer material instead of pressure welding.

The operation of the above configuration will be described. When water is supplied to the electric heater 23, the water in the hot water storage tank 17 is heated from the bottom surface and boiled into high-temperature water. The energization of the electric heater 23 is controlled by a temperature controller 39 attached to the side surface of the hot water storage tank 17 so as to maintain a constant hot water temperature. Since the high heat of the heater unit 22 is insulated by the heat insulating material 25 and the bottom heat insulating material 28, it is not transmitted to the drain pipe 21 or the bottom plate 27.

When the hot water tap 16 is opened, water to be cooled in the pipe enters by way of the water pressure through the inlet 32 and is supplied to the lower part of the hot water storage tank 17 through the water supply passage 35 and the water supply pipe 36. At this time, a part of the water to be cooled flows to the outlet 33 through the bypass passage 37. The hot water is pushed out from the water supply port 18 at the upper part of the hot water storage tank 17, flows through the hot water supply passage 38 to the outlet 33, is mixed with the water to be cooled inside the pipe, becomes hot water of a suitable temperature, and is discharged from the hot water tap 16.

As described above, according to the hot water supply device of the embodiment of the present invention, the hot water storage tank 17 can be fixed to the bottom plate 27 by the drain port 19 and the drain pipe 21 without using a dedicated leg, so that the hot water storage tank 17 becomes independent. be able to.

[0025]

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

(1) The hot water storage tank can be supported using a drain port and a drain pipe. (2) Welding of the stand-alone legs of the hot water storage tank can be completely eliminated, and there is no welded portion that easily corrodes, so that the quality of the hot water storage tank can be ensured for a long time.

(3) The hot water storage tank is vertically self-supporting, and can easily penetrate the water supply port through the hole of the top plate, so that the assemblability can be improved.

(4) Since the high heat of the hot water storage tank is blocked by the heat insulating material between the drain pipe and the bottom plate, the bottom plate is safe without overheating.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a hot water heater according to one embodiment of the present invention.

FIG. 2 is an exploded view of the main part.

FIG. 3 is a configuration diagram of a conventional hot water heater.

[Explanation of symbols]

 17 Hot water storage tank 18 Water supply port 19 Drain port 20 Fixing screw 21 Drain pipe 27 Bottom plate 28 Bottom heat insulating material 29 Screw 30 Drain plug 31 Pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24H 9/16 F24H 1/18

Claims (2)

(57) [Claims] 1. A storage having a water supply port at an upper part and a drainage port at a lower part.
A hot water tank and a heater unit mounted on the bottom of the hot water storage tank
And a horizontal drain plug connected to the drain port with a screw.
And a drain pipe to be attached to the bottom of the drain pipe.
By attaching a bottom plate to this screw part,
An instant water heater configured to support the hot water storage tank . 2. The drain pipe is fastened with screws between a bottom surface and a bottom plate through a board-shaped heat insulating material made of a flame-retardant material.
The described hot water heater.