JP3079874B2 - 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 supply device that supplies 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. 2 as a water heater provided in the middle of a pipe between a water heater and a hot water tap.

In FIG. 2, 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. 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.

[0004] The hot water storage tank 1 is fixed to a bottom plate 9 with 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. Entrance 1
3 is connected to a water heater 14 and outlet 15 is connected to a hot water tap 16 by piping.

Next, the structure of the water passage will be described with reference to FIG. Water entering from the inlet 13 is connected to a lower water supply joint 19 via a water supply passage 17 via a water supply pipe 18 provided outside the hot water storage tank 1. One of the water supply joints 19 is connected to the water supply port 3 of the hot water storage tank 1, and the other is connected to the drain plug 20. In addition, a bypass passage 21 branches from the middle of the water supply passage 17 and communicates with a hot water supply passage 22.

In the above configuration, hot water is always stored in the hot water storage tank 1 by the heater 6. When the hot water tap 16 is opened, the hot water mixes a part of the water supplied from the bypass passage, and the hot water is discharged from the hot water tap 16 as hot water of a suitable temperature. Cooled water in the pipe with the water heater 14 is supplied from the water inlet 3 to the hot water tank 1
to go into. By the time the hot water in the hot water storage tank 1 is exhausted, the hot water boiled from the water heater 15 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.

[0007]

In such a conventional hot water supply apparatus, since the water supply pipe 18 is provided outside the hot water storage tank 1, there are the following disadvantages.

(1) When the water supply pipe is cooled by natural heat radiation when the water is heated up and left, the hot water in the hot water storage tank circulates from the upper part through the water supply pipe to the lower part of the hot water storage tank to increase the amount of heat radiation.

(2) Since the water supply pipe 18 is located outside the hot water storage tank 1, the exterior is large and the installation space is large.

(3) Since the water supply pipe 18 is located outside the hot water storage tank 1, two steps of tightening the connecting portions 23 and 24 are required.

(4) There are two connection points and there is a high risk of a water leak accident. (5) The water supply joint 19 has a complicated three-way cheese shape, and requires highly difficult processing.

An object of the present invention is to provide a water heater of a simple type in which a water supply pipe is provided in a hot water storage tank to form a bypass passage.

[0013]

In order to achieve the above object, the present invention provides a water supply pipe extending from an inlet to a lower part of a hot water tank through an inside of the hot water tank from an upper connection port of the hot water tank via a water supply passage. It has a bypass passage branching from the water supply passage and leading to the outlet, and a hot water supply passage leading from the hot water storage tank to the outlet. Both the water supply pipe and the hot water supply passage are connected to the upper connection port, and both the bypass passage and the hot water supply passage are provided. At one exit.

[0014]

According to the present invention, since the water supply pipe passes through the inside of the hot water storage tank, the number of parts related to the connection of the water supply pipe can be reduced, and there is no danger of water leakage failure. Since the water supply pipe is integrated with the hot water supply fitting,
Installation is completed only by connecting the hot water supply joint to the upper connection port of the hot water tank. Further, the flow rate of the bypass feedwater passing through the bypass passage can be easily set by adjusting the hole diameter of the bypass passage.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a water heater according to one embodiment of the present invention.
In the figure, a water supply port 26 is provided at an upper portion of a hot water storage tank 25 and a drainage port 27 is provided at a lower portion.

The drain port 27 is located at the center of the hot water tank 25,
A screw that fits with the fixing screw 28 is provided on the outer circumference, and a screw that fits with the drain pipe 29 is provided on the inner circumference.

The heater 30 comprises an electric heater 31 and a heat transfer plate 32. The upper surface of the heat transfer plate 32 has the same shape as the bottom surface of the hot water storage tank 25, and the lower surface has a substantially disk-like shape provided with a groove on which the electric heater 31 can be mounted. Molded with aluminum alloy. The electric heater 31 is a cylindrical rod-shaped sheathed heater which is press-fitted into a groove of the heat transfer plate 32 and is mounted with good heat conduction.

At the center of the heat transfer plate 32 thus formed, a hole through which the drain port 27 of the hot water storage tank 25 penetrates is provided.

The heater 30 is inserted into the drain port 27 of the hot water tank 25 and is attached to the bottom of the hot water tank 25 by a fixing screw 28 via a disk-shaped heat insulating material 33 made of a flame-retardant material. A drain pipe 29 is provided at the drain port 27.
Are connected with screws. Further, the drainage pipe 29 has a screw on the bottom surface and is fixed to a screw hole at the center of the bottom plate 34 from below by a screw 36 via a heat insulating material 35 so that the hot water tank 2
5 has a structure that can stand alone without legs.

The water supply joint 37 has an inlet 38 connected to the water heater 14, an outlet 39 connected to the hot water tap 16, and a connection port 40 connected to the water supply port 26 of the hot water tank 25. Entrance 3
8 is a water supply pipe 42 extending to the lower part of the hot water tank 25 and a bypass passage 43 leading to the outlet 39.
Are in communication with each other. A hot water supply passage 44 communicating with the outlet 39 is provided in parallel with the bypass passage 43.

Here, the heater 30 may be a cast heater in which the electric heater 31 is cast integrally with the heat transfer material instead of the pressure welding.

In the above configuration, when the water in the hot water storage tank 25 is energized to the heater 30, the water is heated from the bottom surface and boiled into high-temperature water. The energization of the heater 30 is controlled to a constant hot water temperature by a temperature controller 45 provided in a part of the hot water storage tank 25. Heater 30
The high heat is not transmitted to the drain pipe 29 and the bottom plate 34 because it is cut by the heat insulating material.

Next, the method of use will be described. When the hot-water tap 16 is opened, the cold water in the pipe enters by way of the water pressure from the inlet 38, and is supplied to the lower part of the hot-water storage tank 25 through the water supply passage 41 and the water supply pipe 42. At this time, part of the cooled water is
Flow through 3 to exit 39. The hot water is pushed out from the water supply port 26 at the upper part of the hot water storage tank 25, flows through the hot water supply passage 44 to the outlet 39, is mixed with the water cooled inside the pipe, becomes hot water of the appropriate temperature, and is discharged from the hot water tap 16.

As described above, according to the water heater of the embodiment of the present invention, since there is no water supply pipe outside the hot water storage tank 25, the number of connection points can be minimized, the cost is significantly reduced, and the reliability against water leakage accidents is also improved. Get higher.

[0025]

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

(1) Since there is no temperature difference between the inside of the water supply pipe and the hot water storage tank, there is no loss of heat radiation due to natural convection from the water supply pipe after boiling.

(2) Since the water supply pipe passes through the inside of the hot water storage tank, the outer dimensions can be reduced and the installation space can be reduced.
The miniaturization of the dimensions is very effective, especially when it is stored and installed inside a vanity stand.

(3) The number of connection points of the water supply pipe can be reduced by two, and the reliability against water leakage accidents can be improved.

(4) The water supply pipe and the connection joint can be simplified, and the cost of parts and the number of assembly steps can be reduced.

(5) Since the water in the water supply pipe does not freeze even during non-use when power supply is stopped, it is not necessary to frequently drain the water even in winter.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing the configuration of a conventional water heater.

FIG. 3 is a system diagram showing a conventional water passage.

[Explanation of symbols]

 25 Hot water storage tank 38 Inlet 39 Outlet 41 Water supply passage 42 Water supply pipe 43 Bypass passage 44 Hot water supply passage

Claims (2)

(57) [Claims] 1. A water supply pipe extending from an upper connection port of a hot water tank to a lower part of the hot water tank via a water supply passage, a bypass passage branched from the water supply passage to an outlet, and a hot water tank. And a hot water supply passage leading to the outlet,
A water heater that has both a bypass passage and a hot water supply passage at one exit. 2. The water heater according to claim 1, wherein both a water supply pipe and a hot water supply passage are connected to an upper connection port of the hot water storage tank.