JPH0148466B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a water heater with additional heating.

Conventionally, as shown in FIG. 1, a heat exchanger intervenes in a circulation path g connected to a hot water supply boiler e and a bathtub f, which is equipped with a waterway c connecting a water source a and a hot water tap b, and a heat exchanger d intervening in the waterway c. After supplying hot water heated by the hot water supply boiler e to the bathtub f via the hot water tap b, when the temperature of the hot water is low, the circulation path g is A type in which hot water stored in the bathtub f is reheated by a reheating boiler j is generally known. But this one is
There is no means for automatically stopping the supply of hot water after a certain amount of hot water is supplied into the bathtub f.

For this reason, it is necessary to use a timer or a water level gauge to artificially stop the hot water supply when a certain amount of hot water is supplied, which is inconvenient and requires a control system to operate everything from supplying hot water to the bathtub to boiling it. It is inconvenient that it is difficult to do so.

The object of the present invention is to provide a water heater with additional heating that does not have such inconveniences, and includes a water supply boiler equipped with a waterway connecting a water source and a hot water tap, and a heat exchanger interposed in the waterway. In those equipped with a reheating boiler equipped with a heat exchanger that intervenes in the circulation path connected to the bathtub, a connection path is provided that connects the circulation path with the downstream side of the heat exchanger in the waterway, and a flow rate is set in the connection path. It is characterized by the intervention of a water solenoid valve that opens when the counter is set and closes when the counter completes.

Embodiments of the invention will be described with reference to the drawings.

In the drawing, 1 is a waterway connecting the water source 2 and the tap 3, and 4
5 indicates a hot water boiler equipped with a heat exchanger 4a that intervenes in the waterway 1, and 5 indicates a reheating boiler equipped with a heat exchanger 5a that intervenes in a circulation path 7 connected to the bathtub 6. It is equipped with a thermistor 8 that detects the temperature of the water flowing through it, and a circulation pump 9 that operates when the thermistor 8 detects the temperature of the water below the set temperature.There is no particular difference from what has been commonly used in the past. Furthermore, the boiler 4 for hot water supply and the boiler 5 for reheating are each equipped with gas burners 4b and 5b as heat sources, and the exhaust gas from the gas burners 4b and 5b is guided to an exhaust stack 12 by an exhaust fan 11 via a common exhaust duct 10. The gas burners 4b and 5b are operated by flow switches (not shown) intervening in the water channels 1 and 7, respectively, which is no different from those commonly used in the past.

In such a case, the present invention connects the downstream side of the heat exchanger 5 of the water channel 1 and the circulation path 7 with a connecting pipe 13, and connects a water volume counter 14 to the connecting pipe 13 and a count value of the water volume counter 14. A water solenoid valve 15 that opens according to a signal during setting and closes when the count is completed is provided, and the connecting pipe 13 is further provided with two check valves 16, 1.
6 to prevent water from flowing back from the bathtub 6 side to the water source 2 side.

As shown in FIG. 3, the water flow counter 14 includes an impeller 14b equipped with a magnet 14a facing into the waterway 1, and a detection section 14c that detects the rotation of the impeller 14b. 14b is extracted as a pulse signal.

And the water solenoid valve 15 by the water amount counter 14
The control is performed by an electric circuit as shown in FIG. 4, for example.

To explain this, an integrating counter A that counts pulse signals from the detection section 14c of the water amount counter 14, a DC/AC converter B that switches the DC signal from the counter A to an AC signal, and the DC/AC converter B It consists of a comparator D that compares the alternating current signal from the pump with the signal from the volume setting device C, and a reset signal circuit E that intervenes in the counter A, and the reset signal circuit E is equipped with a normally open main switch _SW1. and a normally closed sub-switch SW ₂ .
In addition, the main switch SW ₁ is configured to maintain the circuit in a self-holding state by intervening the relay contact r ₁ of the first relay R ₁ in parallel, and the water solenoid valve 1 is also configured to maintain the circuit in a self-holding state.
The control circuit for the coil 14a of No. 5 includes contacts of a second relay R ₂ and a third relay R ₃ connected in series to the power supply 17 via the main return switches SW 1 and SW _{2 .}
Further, the third relay _R3 is connected in series with a thyristor _S as a switching element, and the thyristor S is connected to the third relay R3 so that the signal from the DC/AC converter B is used to set the water flow rate. The signal generated at the output terminal of the comparator D when the signal becomes higher than the signal of the comparator D closes the comparator.

Next, the operation of this device will be explained.

When the main switch SW ₁ is closed to supply water to the bath, the counter A is reset and at the same time, the a contact r ₂ of the second relay R ₂ that intervenes in the water solenoid valve 15 is closed. Therefore, the coil of the water electromagnetic valve 15 is energized, and the water electromagnetic valve 15 opens, causing a flow of water to the bathtub 6 via the water channel 1, the connecting pipe 13, and part of the circulation pipe 7, as shown by the arrow. , This causes the water amount counter 14 to operate, sending a pulse signal corresponding to the amount of water to the counter A, and the counter A starts counting. with flow switch (not shown)
As a result, the gas burner 4a and the exhaust fan 11 of the hot water supply boiler 4 are operated to heat the feed water flowing inside the heat exchanger 4a.

A certain amount of hot water is then stored in the bathtub 6. When the counter by the instant flow counter 14 is completed,
A signal is obtained at the output terminal of comparator D, and thyristor S
A voltage is obtained at the gate of thyristor S, which makes conduction between the source and drain of thyristor S and excites the third relay _R3 . Therefore, b contact _r3 of relay _R3 opens. Therefore, the water solenoid valve 15 is closed. Therefore, there is no flow in the water channel 1, and the hot water boiler 4 becomes inoperable due to the flow switch being turned off. After this operation is completed, the sequence circuit for reheating switches to the operating state, and when the thermistor 8 detects that the water temperature in the bathtub 6 is below the set temperature, as in the conventional ones,
The pump 9 operates to generate a circulating flow within the circulation path 7. According to this, a flow switch (not shown) in the circulation path 7 is closed and the gas burner 5a of the reheating boiler 5 is operated to heat the hot water in the bathtub 6 to the temperature set in the thermistor 8.

For hot water supply, opening the tap 3 activates a flow switch (not shown) in the water channel 1, which operates the gas burner 4a and exhaust fan 11 of the hot water boiler 4 to drain the inside of the heater 4b. It is no different from what has been commonly used in the past, as it heats the flowing water supply.

In the drawing, reference numeral 22 indicates a water control valve inserted into the water channel 1, and the water control valve 16 controls the amount of water supplied when the water temperature is below a set temperature by means of a thermistor 17 provided downstream of the heat exchanger 4a of the water channel 1. It works to keep the temperature of the water exiting the heat exchanger 4a above a certain temperature. Reference numeral 18 denotes an electric heater wrapped around the outlet tap 3 of the water channel 1 to ensure the hot water temperature at the time of hot water start-up, 19 a gas controller interposed in the gas supply device 20, and 21 facing the gas burners 4b and 5b. It is a permanent burner.

According to the present invention, water is supplied to the bathtub via a water solenoid valve that opens when the flow rate counter is set and closes when the counter completes, so that a certain amount of water can be automatically supplied to the bathtub. Since the solenoid valve is inserted into the connection path that connects the circulation path with the downstream side of the heat exchanger in the waterway, it is sufficient to connect the connection pipe to the waterway and the circulation path, and the structure of the waterway is simple. Furthermore, the installation of the water flow counter and the water electromagnetic valve has the advantage that there is no problem with the flow of hot water through the circulation path when hot water is dispensed from the hot water faucet or during reheating.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional example, FIG. 2 is a side view of an embodiment of the present invention, FIG. 3 is an enlarged cross-sectional view of a flow rate counter section, and FIG. 4 is a control circuit diagram. 1... Waterway, 2... Water source, 3... Hot water tap, 4...
... Boiler for hot water supply, 5 ... Boiler for additional heating, 14 ...
Water flow counter, 15...Water solenoid valve.

Claims (1)

[Claims] 1 A water supply system that is equipped with a waterway that connects a water source and a hot water outlet, a hot water supply boiler that is equipped with a heat exchanger that intervenes in the waterway, and a reheating boiler that is equipped with a heat exchanger that intervenes in a circulation path that connects to the bathtub. An additional feature is that a connecting path is provided that connects the circulation path with the downstream side of the heat exchanger in the waterway, and a water solenoid valve that opens when a flow rate counter is set and closes when the counter completes is interposed in the connecting path. Water heater with fire.