JP2001235164A - Instantaneous water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution wherein passages can be switched at times such as summer season or the like when an instantaneous water heater is not needed and a faucet can be made usable at the time of a failure of the instantaneous water heater. SOLUTION: The instantaneous water heater is provided with a hot water supply pipe 2 for allowing hot water from a water heater 1 to flow to a hot water tank 3 and a hot water discharge pipe 4 for allowing the hot water from the hot water tank 3 to a faucet 5. A branch pips 6 for making the hot water supply pipe 2 communicate with the hot water discharge pipe 4 is provided in such a manner as to detour the hot water tank 3 and switching means 7, 8 are provided to switch the flow route to either the hot water tank 3 side or the branch pipe 6 side.

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 supply apparatus.

[0002]

2. Description of the Related Art Conventionally, as schematically shown in FIG. 8, hot water from a water heater 1 is temporarily stored in a hot water tank 3 through a hot water supply pipe 2, and a hot water tap is passed through a hot water supply pipe 4 from the hot water tank 3. There is an instant hot water supply device configured to supply hot water to the metal fitting 5 and to immediately emit hot water from the hot water tank 3 when the faucet of the faucet metal fitting 5 is twisted. To supply hot water from the faucet fitting 5 via the hot water tank 3, the heater power in the hot water tank 3 is turned off.
In summer F or the like, since the cold water in the hot water tank 3 is first discharged from the faucet fitting 5, there is a problem that hot water is delayed. Further, in the case where the hot water tank 3 is broken due to water leakage or the like, hot water is no longer supplied to the faucet fitting 5 and the faucet fitting 5 becomes unusable.

[0003]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned conventional problems, and makes it possible to quickly release hot water in summer or the like. The first gist of the present invention is to provide a hot water supply device that enables a water faucet to be used in a hot water supply pipe, and a hot water supply pipe for flowing hot water from a water heater to a hot water tank, and a hot water faucet for hot water from a hot water tank. In a real-time hot water supply device provided with a hot water supply pipe flowing into the hot water tank, a branch pipe is provided to bypass the hot water tank and communicate with the hot water supply pipe and the hot water supply pipe, and a switching for switching a flow path to the hot water tank side or the branch pipe side is performed. That is, a means is provided. A second gist is that a backflow preventing means for preventing a backflow from the tapping pipe side to the hot water tank is provided. A third gist is that a switch for operating the switching means and the backflow prevention means is provided.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a piping configuration of an instant hot water supply apparatus according to a first embodiment, in which hot water from a hot water supply 1 is supplied to a hot water tank 3 through a hot water supply pipe 2. Hot water in the tank 3 passes through the hot water supply pipe 4 and a faucet fitting 5
In this example, the hot water supply pipe 2 is provided with a branch portion 6a, the branch pipe 6 is extended from the branch portion 6a, and the branch pipe 6 is connected to the hot water tank 3 at the connection portion 6b. It is connected to the downstream tapping pipe 4 in communication,
An electromagnetic valve 7 is provided between the branch 6a and the hot water tank 3 so as to be openable and closable, and another electromagnetic valve 8 is also provided in the branch pipe 6 downstream of the branch 6a. I have.

[0005] With such a configuration, in a summer or the like where the hot water tank 3 is not required, the heater in the hot water tank 3 is turned off, the solenoid valve 7 is closed, the solenoid valve 8 is opened, and the hot water supply pipe 2 is connected. When the hot water supply pipe 4 is directly communicated with the branch pipe 6 and hot water from the water heater 1 is supplied to the faucet fitting 5 through the branch pipe 6, when the faucet of the faucet fitting 5 is twisted, the hot water tank 3 is opened. Hot water from the water heater 1 is directly supplied to the faucet fitting 5 without passing through, and in the past, the arrival of hot water to the faucet fitting 5 was delayed by the amount of cold water in the hot water tank 3, but without delay. Hot water can be supplied to the faucet fitting 5 at an early stage. Further, in the summer season, the hot water tank 3 can be detached and taken out of the bathroom, so that the bathroom can be widely used. If a switch capable of operating the solenoid valves 7 and 8 is provided in a bathroom, a dressing room, or the like, the switch can be easily switched by operating the switch in summer or the like.

FIG. 2 shows a modified example, in which a three-way valve 9 is provided in a branch portion 6a instead of the solenoid valves 7 and 8, and the three-way valve 9 is switched to operate. In summer and the like, the flow path can be switched so that hot water flows directly to the faucet fitting 5 through the branch pipe 6 without flowing hot water to the hot water tank 3 side.

Next, FIG. 3 is the same as the piping configuration of FIG. 1, except that a check valve 10 is provided between the hot water tank 3 and the connecting portion 6b. The hot water from the water heater 1 can be passed through the branch pipe 6 when the hot water tank 3 is leaking or when there is a failure such as a failure in energization of the heater in the hot water tank 3. The flow path can be switched so as to supply the water directly to the plug 5. In this case, the check valve 10 reliably prevents the backflow from the hot water supply pipe 4 to the hot water tank 3, and prevents water leakage from the hot water tank 3. Thus, even when the hot water tank fails, the faucet fitting 5 can be used as it is. In FIG. 3, a three-way valve 9 may be provided in the branch portion 6a instead of the solenoid valves 7 and 8.

Next, in the piping configuration of FIG.
A solenoid valve 11 is provided in place of the
When hot water flows to the hot water tank 3, the electromagnetic valve 11 can be closed to prevent backflow to the hot water tank 3. When hot water flows into the hot water tank 3, the electromagnetic valve 11 and the electromagnetic valve 11 can be closed.
Is opened, and the electromagnetic valve 8 is closed, so that it can function as an instant hot water supply device.

Next, in FIG. 5, a three-way valve 9 is provided in the branch portion 6a so that the flow path can be switched, and a check valve 10 is provided between the hot water tank 3 and the connection portion 6b. Yes, even in such a configuration, the hot water tank 3
The hot water from the water heater 1 can be supplied directly to the faucet 5 through the branch pipe 6 so that it can be used, and when the hot water tank 3 fails, the backflow to the hot water tank 3 can be performed. Can be prevented without fail.

Next, in the piping configuration shown in FIG. 6, a three-way valve 9 is provided at the branch portion 6a and a three-way valve 12 is also provided at the connection portion 6b, and the three-way valves 9 and 12 are switched. ,
In the winter, etc., the hot water from the water heater 1 flows to the hot water tank 3 side,
In summer or the like, switching can be performed so that hot water is supplied to the branch pipe 6 side by switching to supply hot water from the water heater 1 directly to the faucet fitting 5, and the three-way valve 12 is switched. Thus, backflow to the hot water tank 3 can be prevented.

Instead of the three-way valve 9 in the configuration of FIG. 6, two solenoid valves 7, 8 may be provided as shown in FIG. 7, and in summer or the like, the solenoid valve 7 is closed and the solenoid valve 8 is closed. And the three-way valve 12 connects the branch pipe 6 and the tapping pipe 4, and shuts off the passage to the hot water tank 3 to prevent backflow. And can be supplied directly to the faucet fitting 5. Also,
The faucet fitting 5 can be used well even when the hot water tank 3 fails.

[0012]

According to the present invention, there is provided an instant hot water supply apparatus having a hot water supply pipe for flowing hot water from a water heater to a hot water tank and a hot water supply pipe for flowing hot water from the hot water tank to a faucet. By providing a branch pipe for communicating the hot water supply pipe with the hot water supply pipe, and by providing a switching means for switching a flow path to the hot water tank side or the branch pipe side, in summer or the like where an immediate hot water supply device is not required. By bypassing the hot water tank via the switching means, the hot water from the water heater can be directly supplied to the faucet fitting through the branch pipe, and in the summertime etc., the hot water tank can be removed to widely use the bathroom. This makes it possible to quickly discharge hot water from the faucet in summer or the like.

Further, by providing a backflow preventing means for preventing backflow from the tapping pipe side to the hot water tank, backflow to the hot water tank is prevented when the hot water tank is leaking due to corrosion or the like. Thus, when the hot water tank fails, hot water from the water heater is supplied to the faucet through the branch pipe so that the faucet can be used even when the hot water tank fails.

Further, by providing a switch for activating the switching means and the backflow prevention means, the switch is operated to easily operate the switching means or a valve constituting the backflow prevention means, thereby forming the flow path. Switching can be performed, and operation becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic piping configuration diagram of an instant hot water supply device provided with branch piping.

FIG. 2 is a piping configuration diagram in a case where a three-way valve is provided in a branch portion.

FIG. 3 is a piping configuration diagram provided with a check valve.

FIG. 4 is a piping configuration diagram in which an electromagnetic valve is provided instead of a check valve.

FIG. 5 is a piping configuration diagram in which a check valve and a three-way valve are provided at a branch portion.

FIG. 6 is a piping configuration diagram in which a three-way valve is provided at each of a branch portion and a connection portion.

FIG. 7 is a piping configuration diagram provided with a three-way valve and two solenoid valves.

FIG. 8 is a schematic configuration diagram of piping of a conventional instant hot water supply apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hot water supply device 2 hot water supply pipe 3 hot water tank 4 hot water supply pipe 5 faucet fitting 6 branch pipe 6a branch section 6b connection section 7, 8, 11 solenoid valve 9, 12 three-way valve 10 check valve

Claims (3)

[Claims] 1. An instant hot water supply system comprising a hot water supply pipe for flowing hot water from a water heater into a hot water tank and a hot water supply pipe for flowing hot water from the hot water tank to a faucet fitting, wherein the hot water supply pipe bypasses the hot water tank. An instantaneous hot water supply apparatus comprising: a branch pipe for communicating the hot water supply pipe with the hot water tank; and switching means for switching a flow path to the hot water tank side or the branch pipe side. 2. A backflow preventing means for preventing backflow from the hot water supply pipe side to the hot water tank is provided.
An instant hot water supply apparatus according to item 1. 3. The instant hot water supply apparatus according to claim 2, further comprising a switch for operating the switching unit and the backflow prevention unit.