JPH03144254A - Additional heating and hot water feeding apparatus - Google Patents

Abstract

PURPOSE:To enable a specified amount of water to be fed into a both tub by a method wherein a connection passage for connecting a downstream side of a heat exchanger in a water passage with a circulation passage is provided, and the connection passage is provided with a water solenoid valve which close upon completion of feeding of hot water and a check valve. CONSTITUTION:A downstream side of a heat exchanger 5 in a water passage 1 and a circulation passage are connected by a connection pipe 13. The connection pipe 13 is provided with a water volume counter 14 and a water solenoid valve 15 to be opened with a signal for use in setting a counting value of the water volume counter 14 and to be closed upon completion of the counting operation. In addition, the connection pipe 13 is provided with two check valves 16 so as to prevent water of the bath tub 6 from flowing back to the water source 2. A control of the water solenoid valve 15 with the water volume counter 14 is carried out by an electrical circuit. With such an arrangement, it is possible to perform an automatic feeding of water of a specified amount.

Description

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

Conventionally, as shown in Fig. 1, there is a heat exchanger that intervenes in a circulation path g that connects a hot water boiler e and a bathtub f, which is equipped with a waterway C that connects a water source a and a hot water tap, and a heat exchanger d that intervenes in the waterway C. After supplying hot water heated by the boiler e for hot water supply to the bathtub f through the hot water tap, when the temperature of the hot water is low, the hot water is supplied to the bathtub f via the circulation path g. A type of bathtub in which hot water stored in the bathtub f is reheated by a reheating boiler j is generally known. But this one is bathtub f
There is no means to automatically stop the supply of hot water after a certain amount of hot water has been supplied.

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. There is a problem with it being difficult to do.

The object of the present invention is to obtain a water heater with a rear end that is free from such inconveniences, and includes a water channel connecting a water source and a hot water tap;
A hot water supply boiler equipped with a heat exchanger intervening in the waterway, and a reheating boiler equipped with a heat exchanger intervening in the circulation path connected to the bathtub, in which there is a small number of hot water boilers equipped with a heat exchanger intervening in the waterway, An embodiment of the present invention will be described with reference to the drawings, which is characterized in that a connecting path connecting the downstream side and the circulation path is provided, and a water solenoid valve and a check valve that close upon completion of filling the hot water are interposed in the connecting path. do.

In the drawing, (1) is a waterway connecting the water source (2) and the hot water tap (3), (4) is a hot water boiler equipped with a heat exchanger (4a) that intervenes in the waterway (1), and (5) is It shows a reheating boiler equipped with a heat exchanger (5a) intervening in a circulation path (A) connected to a bathtub (6), and a thermistor (8) in the circulation path (7) to detect the temperature of the water flowing through it. and a circulation pump (9) that operates when the thermistor (8) detects that the water temperature is below the set temperature.
) The hot water supply boiler (4) and the reheating boiler (5) are each equipped with gas burners (4b) (5b) as heat sources, The gas burner (4b) (
The exhaust gas from the gas burners (4b) (5b) is guided and discharged from the exhaust pipe (12) by an exhaust fan (11) through a common exhaust duct (10).
The fact that these are operated by flow switches (not shown) intervening in the water channel (1) and the water channel (7), respectively, is no different from those commonly used in the past.

The present invention provides a heat exchanger (
The downstream side of 5) and the circulation path (7) are connected by a connecting pipe (13), and a water volume counter (14) is connected to the connecting pipe (13). A water solenoid valve (15) that closes upon completion of the opening count is provided, and the connecting pipe (13) is further provided with two check valves (16) (1
B) was interposed to prevent water from flowing back from the bathtub (6) side to the water source (2) side.

The water volume counter (14) is set to the water channel (14) as shown in Figure 3.
) and a detection unit (14c) that detects the rotation of the impeller (14b).
The detection unit (14c) detects the impeller C14.
The rotation speed of b) is extracted as a pulse signal.

and a water solenoid valve (15) by the water quantity 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 It consists of a comparator that compares the alternating current signal from the converter B 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 has a normally open type. Main switch SW+ and normally closed sub switch SW2
and a first relay R3 for the main switch SW+.
It is configured to maintain the circuit in a self-holding state by intervening in parallel with the relay contacts ``,'' and the water solenoid valve (15
), the control circuit for the coil (14a) includes a contact a of a second relay R2 and a third relay R3 connected in series to the power supply (17) via the main switch SW+5SW2.
B contact r3 is interposed therebetween, and the third relay R
3 connects a thyristor S as a switching element in series with this, and the thyristor S is connected to the DC/AC converter B.
When the signal from the water volume setting device C becomes higher than the signal from the water amount setting device C, the comparator is closed by a signal generated at the output terminal of the comparator.

Next, the operation of this device will be explained.

When the main switch SW+ is closed to supply water to the bath, the counter A is reset and at the same time, the a contact r2 of the second relay R2 that intervenes in the water solenoid valve (15) is closed. For this reason, the coil of the water solenoid valve (15) is energized, the water solenoid valve (15) opens, and as shown by the arrow, the water is passed through the water channel (1>, the connecting pipe (13), and part of the circulation pipe (7)). Bathtub (6)
A flow of water occurs, which causes the water flow counter (14
) is activated, sends a pulse signal according to the amount of water to counter A, and counter A starts counting. At the same time, the gas burner (4a) and exhaust fan (11) of the hot water supply boiler (4) are operated by a flow switch (not shown) 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 rate counter (14) is completed, a signal is obtained at the output terminal of the comparator, a voltage is obtained at the gate of the thyristor S, and the source and drain of the thyristor S are made conductive and the third relay R3 is energized. . For this reason, relay R1
b contact r3 opens. Therefore, the water solenoid valve (15) is closed. Therefore, the flow in the water channel (1) disappears, and the hot water boiler (4) becomes inoperable by turning off the flow switch.

After this operation is completed, the sequence circuit for the rear impact angle switches to the operating state, and the thermistor (8) controls the temperature of the water in the bathtub (6) to below the set temperature, similar to those commonly used in the past.
When detected, the pump (9) operates and the circulation path (7)
Create a circulating flow within. According to this, the circulation path (7)
The flow switch (not shown) inside is closed to operate the gas burner (5a) of the reheating boiler (5), and the thermistor (
The hot water in the bath Vj (8) is heated to the temperature set in 8).

For hot water supply, by opening the tap (3), a flow switch (not shown) in the water channel (1) is activated, which turns on the gas burner (4a) and exhaust fan (11) of the hot water boiler (4). The heater (4b) is operated to heat the water supply flowing through the heater (4b), which is no different from the heater (4b) that has been generally used in the past.

In the drawing, (22) shows a water control valve inserted in the water channel 1), and the water control valve (16) is connected to the heat exchanger (4a) of the water channel (1).
) The thermistor (17) provided downstream of the heat exchanger (4a) throttles the amount of water supplied when the water temperature is below the set temperature, and works to maintain the water temperature leaving the heat exchanger (4a) above a certain temperature. (18) is an electric heater wrapped near the hot water tap (3) of the waterway (1) to ensure the hot water temperature when the hot water starts to flow, and (19) is a gas controller interposed in the gas supply device (20). , (21) are permanent burners facing the gas burners (4b) and (5b).

In this way, according to the present invention, water is supplied to the bathtub via a water solenoid valve that closes when the water is filled, so that a certain amount of water can be automatically supplied to the bathtub. Since the check valve is inserted into the connection path that connects the circulation path to the downstream side of the waterway heat exchanger, it is sufficient to connect the connection path to the waterway and the circulation path, and the structure of the waterway is simple. Furthermore, by installing a water solenoid valve and a check valve, there will be no hindrance to the hot water coming out from the hot water faucet or the flow of hot water through the circulation path in the event of a rear-end collision, and moreover, the dirty hot water from the bathtub side will be diverted to the water source side. There are effects such as being able to easily prevent backflow by simply intervening a backflow valve in the connection path.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional example, and Fig. 2 is an embodiment of the present invention.
A side view of the example, FIG. 3 is an enlarged sectional view of the flow rate counter section, and FIG. 4 is a control circuit diagram. (1)...Waterway (2)...Water source (3)
... Hot water tap (4) ... Hot water boiler (5
)...Boiler for reheating (14)...Water flow counter (15)...Water solenoid valve patent Applicant: Rinnai Co., Ltd.
Rito Kitamura Kin -1
2 people outside the hair Fig. 1 '11 ] So 0 Fig. 3

Claims (1)

[Claims] A hot water supply boiler equipped with a water channel connecting the water source and the hot water tap, a heat exchanger intervening in the water channel, and a reheating boiler equipped with a heat exchanger intervening in the circulation path connected to the bathtub. and a connecting path connecting the circulation path with the downstream side of the heat exchanger in the waterway, and a water solenoid valve and a check valve that close upon completion of hot water filling are interposed in the connecting path. Water heater with fire.