JP2000310449A - Hot water heater utilizing solar heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water heater which enables effective utilization of hot water from a solar heat calorifier even during the stoppage of the operation of a hot water supply device. SOLUTION: A mixing valve 8 for mixing hot water and water from a hot water supply device 1 communicating with a solar water heater 5 to a set temperature is controlled to be fixed at a constant set temperature mixing by an OFF operation with an operation switch 150 of the hot water supply device 1. This enables effective utilization of hot water from the solar water heater 5 efficiently even under the stoppage of the operation of the hot water supply device 1.

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 system using solar water, which supplies hot water from a solar water heater and hot water from a hot water supply type water heater to a set temperature by using a mixing valve.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 56-27457, hot water from a solar water heater and hot water from a water heater are set by a mixing valve. By supplying hot water as temperature hot water,
It was designed to provide efficient hot water supply.

[0003]

By the way, in the prior art, when the operation switch of the water heater is turned off, the power supply to the mixing valve is also stopped. Therefore, the mixing valve is stopped at the position when the power supply is stopped, the water supply side or the hot water supply side. If it is fixed to the fully closed position and you try to use the solar water heater even when the water heater is off, depending on the condition of the mixing valve, it is not known how many hot water is supplied, and there is a risk of burns etc. due to the supply of high temperature water. However, there is a problem that the hot water from the solar water heater cannot be used effectively.

[0004]

The present invention focuses on this point and solves the above-mentioned drawbacks. In particular, the present invention relates to a water heater for supplying hot water directly from a solar water heater or by heating with a heater. A mixing valve for appropriately mixing hot water and water from the water heater to obtain hot water at a set temperature, wherein the mixing valve is operated with a water heater operation switch OFF.
At times, the temperature is fixed at a fixed set temperature.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Even if the operation switch 15 of the water heater 1 is turned off for energy saving, the control circuit 14, the mixing valve 8, the hot water thermistor 13, and the water supply flow sensor 18 are continuously energized. Is mixing valve 8
A signal for setting the set temperature at a constant temperature is output.

In this state, if a hot water supply is requested,
Is not operated, the hot water supplied from the solar water heater 5 to the can 2 of the water heater 1 is directly discharged from the tap water pipe 9, and the hot water supply temperature detected by the hot water supply thermistor 13 by the mixing valve 8 becomes a set constant temperature. In this manner, the hot water is supplied at a constant temperature by mixing with the water supplied from the water supply pipe 10, and when the hot water temperature from the solar water heater 5 is lower than the predetermined temperature, the tapping side is fully opened and the mixing is performed. The hot water is supplied as it is.

Accordingly, the operation switch 15 of the water heater 1 is
Even if the FF is performed, the hot water of the solar water heater 5 can be effectively used as hot water supply, and the minimum hot water supply can be performed while saving energy without using the hot water heater 1, which is extremely convenient.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a solar water heating apparatus according to the present invention. Reference numeral 1 denotes a hot water storage type water heater having a hot water storage can 2, which is provided with a heater 3 comprising a gun burner using oil as a fuel at a lower portion, and a hot water thermistor 4 for detecting the temperature of hot water in the can 2. , The heater 3 is controlled to keep the hot water in the can 2 at a constant temperature of 80 ° C.

Reference numeral 5 denotes a natural circulation type solar water heater installed on a roof, which heats water supplied from a water inlet pipe 6 with solar heat and places the water in a can body 2 of the water heater 1 through a hot water pipe 7. It is to be distributed.

Reference numeral 8 denotes a mixing valve for mixing the hot water in the can 2 supplied through the tapping pipe 9 with the water supplied through the water supply pipe 10 to supply hot water from the hot water supply pipe 11 as hot water at a set temperature. Then, control is performed by inputting a set temperature from the setter 12 provided in the hot water supply unit and enabling setting of a desired hot water supply temperature and a detected temperature from the hot water supply thermistor 13 for detecting the hot water temperature after mixing, and performing a comparison operation. A driving section (not shown) such as a stepping motor is driven by an output signal from the circuit 14 to perform mixing at an optimum mixing ratio.

Reference numeral 15 denotes a water heater 1 provided in the setting device 12.
Operation switch that controls ON and OFF of the operation of
In some cases, the operation of the setting device 12 is made effective, and the drive circuit 16 for controlling the heater 3 to be turned on and off at the temperature detected by the can body thermistor 4 is energized. When the heating device 3 is turned off, the setting device 12 and the drive circuit 16 are turned on. Is stopped, and the set temperature value of the control circuit 14 is set to a constant value, here 5
A signal to be fixed at 0 ° C. is input.

The control circuit 14 and the drive circuit 16 may be constituted by a single microcomputer to constitute the main circuit 17, or may be constituted by a single microcomputer, respectively.
However, the control circuit 14 is directly connected to the power supply so that the operation switch 15 does not control the energization.

Reference numeral 18 denotes a water supply flow sensor provided between the mixing valve 8 and the hot water supply pipe 11 similarly to the hot water supply thermistor 13, which detects a hot water supply request by flowing water by opening the faucet 19 or the like and sends a signal to the control circuit 14. That is, even when the operation switch 15 is turned off, the energization is continued together with the hot water supply thermistor 13.

Reference numeral 20 denotes a bath heat exchanger provided in the can body 2, and a circulation circuit 25 comprising a forward pipe 22 having a water flow switch 21 on the way and a return pipe 24 having a circulation pump 23.
The reheating is performed by circulating the bath water through the bath tub 26 through the tub.

Reference numeral 27 designates a filling circuit which branches off from the hot water supply pipe 11 and is connected in the middle of the outgoing pipe 24 via a three-way valve 28. The hot water supply circuit drops a set amount of hot water into the bathtub 26 at a set temperature. Toward 28, a filling water electromagnetic valve 29, a filling water flow sensor 30, and a check valve 31 are sequentially provided.

Reference numeral 32 denotes a relief valve provided in the middle of the hot water supply pipe 7,
Reference numeral 33 denotes an air vent valve in the middle of the tapping pipe 9, and reference numeral 34 denotes an exhaust device that communicates with a combustion chamber 35 inside the can 2 via a smoke pipe 36. Reference numeral 37 denotes an abnormal stop thermometer provided in the can 2, and reference numeral 38 denotes an empty heating detection electrode.

Next, the operation of the embodiment of the present invention will be described. When the operation switch 15 of the setting device 12 is in the ON state,
The heater 3 is turned on so that the hot water supplied from the solar water heater 5 to the can body 2 through the hot water pipe 7 is kept at a certain set temperature, here at 80 ° C. or higher, or at this temperature below this temperature. Then, the hot water in the can 2 is maintained at this constant temperature.

When there is a hot water supply request by opening the faucet 19 or the like, hot water of a certain temperature in the can 2 and the water supply pipe 1 are supplied.
Water from 0 is mixed by the mixing valve 8, and hot water is supplied as hot water at the set temperature set by the setting device 12 or is filled in the bathtub 26 via the filling circuit 27.

Next, in order to stop the operation of the heater 3 for maintaining the inside of the can body 2 at a constant temperature and to save energy, when the operation switch 15 is turned off, the setting device 12 is turned off.
And the power supply to the drive circuit 16 is stopped, and the power supply to the control circuit 14, the mixing valve 8, the hot water supply thermistor 13, and the water supply flow sensor 18 is continued, and the control circuit 14 further comprises an operation switch 15 When the OFF signal is inputted, the set temperature of the mixing valve 8 is fixed at a fixed set temperature, here 50 ° C.

In this state, when there is a hot water supply request by opening the faucet 19 or the like, only the hot water from the solar water heater 5 is supplied to the mixing valve 8 via the inside of the can 2, and here, the temperature is higher than a predetermined set temperature. In some cases, hot water is supplied as hot water at a set temperature by mixing with hot water, and when the temperature is lower than the set temperature, hot water is supplied by fully closing the hot water supply side and fully opening the hot water discharge side.

Therefore, even when the water heater 1 itself is in the stopped state, the hot water of the solar water heater 5 can be effectively used for hot water supply and filling of the bathtub 26 while using the mixing valve 8.
It is very convenient without waste and easy to use.

If the hot water supply thermistor 13 and the water supply flow sensor 18 are located on the hot water supply side of the mixing valve 8, the hot water supply request and the hot water temperature can be reliably detected as described above even when the solar water heater 5 is used alone. It can be used with your heart.

[0023]

As described above, according to the present invention, even if the operation of the water heater is stopped for energy saving, the hot water from the solar water heater can be heated to some extent without any trouble, and the hot water can be supplied. Is effectively used, and there is no waste and the usability is extremely good.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a solar water heater using one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 water heater 3 heater 5 solar water heater 8 mixing valve 13 hot water thermistor 15 operation switch 18 water supply flow sensor

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shinji Adachi 7-7 Higashi Shinbo, Sanjo-shi, Niigata F-term in Corona Co., Ltd. (Reference) 3L073 AA04 AA06 AB07 AB09 AC10 AD07 AE03 AE06

Claims (2)

[Claims] 1. A water heater for supplying hot water from a solar water heater as it is or by heating it with a heater, and a mixing valve for mixing hot water and water from the water heater as appropriate to produce hot water at a set temperature. In the solar water heater, the mixing valve is fixed at a predetermined temperature when the operation switch of the water heater is OFF. 2. The hot water supply device according to claim 1, wherein a hot water supply thermistor and a water supply flow sensor are located on the hot water supply side of the mixing valve.