JPH03144253A - Additional heating and hot water feeding apparatus - Google Patents

Abstract

PURPOSE:To enable an automatic feeding of a specified amount of water into a bath tub to be carried out by a method wherein a connection passage connecting a downstream side of a heat exchanger in a water passage with a location near a pump discharging port in a circulation passage is provided, and a water solenoid valve which well close upon completion of a feeding of hot water and a check valve are installed in the connection passage. CONSTITUTION:When a temperature lower than a set temperature of a hot water in a bath tub 6 is detected by a thermistor 8, a pump 9 is operated and a circulation flow is generated within a circulation passage 7. Thus, a flow switch in the circulation passage 7 is closed to cause a gas burner 5a of an additional heating boiler 5 to be operated and the hot water in the bath tub 6 is heated up to a temperature set in the thermistor 8. In this case, since a connection passage 13 is connected near the discharging port of the pump 9 of the circulation passage 7, its discharging pressure may act against a check valve 16 under an operation of the pump 9 and then it is completely closed. In this way, a specified amount of water can be automatically fed into the bath tub 6.

Description

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

Conventionally, as shown in Fig. 1, there is a hot water supply boiler e equipped with a waterway C connecting a water source a and a hot water tap, and a heat exchanger d intervening in the waterway C, and a heat exchanger intervening in a circulation path g connected to a bath elf. After supplying hot water heated by the hot water supply boiler e 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. However, this bathtub does not have a means to automatically stop the supply of hot water after a certain amount of hot water has been 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 obtain a water heater with a rear end that does not have such inconvenience, and includes a water channel connecting a water source and a hot water tap;
A hot water supply boiler equipped with a heat exchanger that intervenes in the waterway, and a heat exchanger for the reheating boiler and a circulation pump are interposed in the circulation path connected to the bathtub. It is characterized in that a connection path is provided that connects the downstream side of the heat exchanger and the vicinity of the pump discharge port of the circulation path, and a water solenoid valve and a check valve are interposed in the connection path, which closes when filling with hot water is completed.

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 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 This shows a reheating boiler equipped with a heat exchanger (5a) that intervenes in a circulation path (7) connected to a bathtub (6), and a thermistor (8) that detects the temperature of hot water flowing through the circulation path (7). 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.

In such a device, the present invention provides, for example, a connection path (13) between the downstream side of the heat exchanger (5) of the waterway (1) and the circulation path (7).
The connection path (13) is connected to a water flow counter (14) as a water electromagnetic valve that closes when filling is completed, and a water flow control valve that opens according to a signal when setting the count of the water flow counter (14) and closes when the count is completed. An example in which a solenoid valve (15) is provided is shown. Furthermore, two check valves (16) (
16) 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) with a magnet (14a) facing inside the impeller (14b).
The detection unit (14c) detects the impeller (14).
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, for example, an integrating counter A that counts pulse signals from the detection part (14c) of the water volume counter (14), a DC/AC converter B that switches the DC signal from the counter A to an AC signal, and the DC It consists of a comparator that compares the AC signal from the AC 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 SV1 and normally closed sub switch SW
2, and the main switch SL is equipped with a first relay R.
It is configured to maintain the circuit in a self-holding state by intervening in parallel with relay contact ``1'' of relay contact ``1'', and further includes a water solenoid valve (I
The control circuit for the coil (+48) in 5) is connected to the power supply (17) in series through the main switch SW+ and SW2.
The a contact of the second relay R2 and the third relay R connected to
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 water flow rate setting device so that the signal from the DC/AC converter B is connected to the third relay R3. When the signal becomes higher than the signal of C, the signal generated at the output terminal of the comparator closes the comparator.

Next, the operation of the embodiment of this device will be explained.

When the main switch Sv1 is now 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 waterway (1), the connection path (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 R9
b contact 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 the rear impact angle switches to the operating state, and the thermistor (8) controls the water temperature in the bathtub (6) to be below the set temperature, similar to the conventional ones.
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 (
8) Warm the hot water in the bathtub (6) to the temperature set in step 8). Since the connection path (13) is connected to the circulation path (7) near the discharge port of the pump (9), when the pump (9) operates, its discharge pressure acts on the check valve (16). Make sure to close this.

That is, when the connection path (13) is connected to the suction side of the circulation path (7), the check valve (16) is kept open by the suction force of the pump (9), and the check valve (16) is maintained in an open state by, for example, the water solenoid valve (15). According to damage etc., even during a rear-end collision, the circulation path (
7) This causes a problem where water is supplied to the side.

However, the connection path (13) is connected to the pump (9) of the circulation path (7).
), it is possible to solve the problem of not being able to reliably close the check valve (16).

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 interposed in the waterway (1), and the water control valve (15) is connected to the heat exchanger (4a) of the waterway (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 temperature of the water exiting 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 ordinary burners facing the gas burners (4b) and (5b).

As described above, according to the present invention, a fixed amount of water can be automatically supplied to the bathtub because the water is supplied via a water solenoid valve that closes when the bathtub is filled with water, and in particular, the water solenoid valve and the check valve are Since we have inserted a 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 path to the waterway and the circulation path, and the structure of the waterway is simple. Even with the installation of a check valve, there will be no hindrance to the hot water coming out from the water tap or the flow of hot water through the circulation path in the event of a rear-end collision. Since the pump is connected to the vicinity of the pump discharge port, even if air enters the connection path, the pump will not cause an aerolock.Moreover, when a rear-end collision occurs, the discharge pressure of the pump will be lower than the check valve. This has the effect of preventing hot water from flowing back to the water source from the bathtub side without causing any problems.

[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 cross-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 (13)... Connection path (14
)...Water flow counter (15)...Water solenoid valve (1
6) Check valve patent applicant: Rinnai Co., Ltd.
Rihito Kitamura Kingai 3 people Figure 1 Figure 2 Figure 1] So0 Figure 3

Claims (1)

[Claims] It is equipped with a hot water supply boiler equipped with a waterway connecting the water source and the hot water tap, and a heat exchanger intervening in the waterway, and a heat exchanger for the reheating boiler and a circulation pump are interposed in the circulation path connected to the bathtub. In this case, a connecting path is provided that connects the downstream side of the water channel from the heat exchanger to the vicinity of the pump discharge port of the circulation path, and a water solenoid valve and a check valve are installed in the connecting path, which closes when filling is completed. A water heater with additional heating characterized by intervention.