JP2000346446A - Hot-water supplier provided with one-boiler two-water passage type re-heating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the abnormal pressure rise of a bath heat exchanger upon hot-water supplying individual operation. SOLUTION: A one-boiler two-water passage type hot-water supplier with re-heating function is provided with a bath hot-water filling circuit 20 connected to a bath re-heating circulation circuit 11 branched from the hot-water supplying pipe 8 of a hot-water supplying circuit 6 through a motor-driven three-way valve 18. In such a hot-water supplier, a control means 27 retains a hot-water filling condition that the motor-driven three-way valve 18 communicates the bathtub 12 side of a bath re-heating circulation circuit 11 with the bath hot-water filling circuit 20 for a given period of time upon starting hot-water supplying individual operation to stop the circulation of the bathtub water forcibly and, further, controls the motor-driven three-way valve 18 to obtain reheating condition wherein the valve 18 communicates with the bath reheating circulation circuit 11, when the hot-water supplying individual operation has exceeded the given period of time to release a pressure in the bath heat exchanger 4 into the sending pipe 13 and the returning pipe 14 of the bath re-heating circulation circuit 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can, two-channel water heater having a fin tube type heat exchanger and a reheating function.

[0002]

2. Description of the Related Art Conventionally, there has been one of this type shown in FIGS. 4 and 5, for example. Reference numeral 1 denotes a main body of a one-can-two-channel water heater with a reheating function, and a one-can-two-channel heat exchange comprising a hot-water supply heat exchanger 3 and a bath heat exchanger 4 which share heat exchange fins at the upper part of the burner 2. A heat exchanger is provided, and heat exchange is performed by the combustion exhaust gas of the burner 2 passing through the heat exchanger 5.

Reference numeral 6 denotes a hot water supply circuit including a water supply pipe 7 connected to a water pipe (not shown), the hot water supply heat exchanger 3, and a hot water supply pipe 8 connected to a hot water tap (not shown). Water supply pipe 7
Has a flow rate sensor 9 as running water detecting means, and the hot water supply pipe 8 has a hot water supply thermistor 10 for detecting hot water supply temperature.

[0004] Reference numeral 11 denotes a bath reheating circuit for connecting the bath heat exchanger 4 and the bathtub 12 so as to be able to circulate through an outgoing pipe 13 and a return pipe 14. A bath thermistor 16 for detecting the temperature of the circulating bath water; a bath thermistor 16 for detecting the temperature of the circulating bath water;
4, a circulating pump 17 driven by a DC brushless motor forcibly circulating in the order of a bath heat exchanger 4, an outgoing pipe 13, and a bathtub 12, and an electric three-way valve 18, which will be described later, are provided in this order from the bathtub 12 side. The outgoing pipe 13 and the return pipe 14 are connected to the bathtub 12 via the circulation port 19.

[0005] Reference numeral 20 denotes a bath water filling circuit branched from the downstream side of the hot water supply thermistor 10 of the hot water supply pipe 8 and connected to the return pipe 14 of the bath follow-up heating circulation circuit 11 through the electric three-way valve 18. The tension circuit 20 has a check valve 21 for preventing backflow of bathtub water, and an electromagnetic valve 22 for controlling the passage / disconnection of the bath water tension circuit 20.

Reference numeral 23 denotes control means for controlling the one-can-two-channel water heater with reheating function, which is controlled by an input of a remote controller 26 having a temperature setting switch 24 and a bath automatic operation switch 25 and an input of each sensor. By controlling the drive of the load,
Automatic bath operation by hot water supply operation, bath hot water filling operation and bath reheating operation.

In the hot water supply operation, the burner 2 is driven by detecting flowing water by opening a hot water tap, the water from the water supply pipe 7 is heated via the hot water supply heat exchanger 3, and the hot water thermistor 1 is heated.
Control is performed so that the detected temperature of 0 becomes the hot water supply set temperature set by the remote controller 24, and the hot water is supplied from the hot water tap.

In the automatic bath operation, the priming of the circulating pump 17 is performed by inputting an automatic bath switch 25 of the remote controller 26, and then the circulating pump 17 is driven. The presence or absence of remaining hot water is detected, and if there is remaining hot water, a bath reheating operation is performed up to the bath set temperature set by the remote controller 26. If there is no remaining hot water, the bath is automatically heated to the bath set temperature after performing bath hot water filling operation. Perform reheating operation.

The operation of the bath reheating operation will now be described. The electric three-way valve 18 is closed on the side of the bath filling circuit 20 as shown in FIG. In a reheating state in which the side 12 and the bath heat exchanger 4 communicate with each other, the circulating pump 17 is driven to circulate the bath water so that the temperature of the bath water detected by the bath thermistor 16 matches the bath set temperature. The heating of the burner 2 is controlled.

Next, the operation of the bath water filling operation will be described. The electric three-way valve 18 is closed on the bath heat exchanger 4 side of the return pipe 14 of the bath reheating circuit 11 as shown in FIG. The hot water filling circuit 20 is connected to the bathtub 12 side of the return pipe 14 of the hot water recirculation circuit 11, and the electromagnetic valve 22 is opened to supply water from the water pipe to the hot water supply heat exchanger 3.
Heat exchange heat and introduce into bath water filling circuit 20 and solenoid valve 2
2. After passing through the check valve 21 and the electric three-way valve 18 in order, the inside of the return pipe 14 of the bath reheating circuit 11 is circulated to the bathtub 12 side and dropped into the bathtub 12 to fill the bath.

Further, as such a conventional one, for example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 8-233363.

[0012]

However, in such a conventional apparatus, when the hot water supply alone operation is started immediately after the completion of the bath reheating operation, the hot water in the bath reheating circuit 11 (the bath tub 12). (Including hot water) keeps circulating by inertia force, so the hot water in the bathtub 12 is heated to the set temperature, but it is a one-can, two-channel system, so not only the hot water supply heat exchanger 3 but also the bath heat exchange The vessel 4 also exchanged heat, and the bathtub water was further heated, sometimes exceeding the bath set temperature.

Therefore, after the bath reheating operation is completed, the electric three-way valve 18 is set in a bathing state in which the bath filling circuit 20 communicates with the bathtub 12 side of the return pipe 14 of the bath reheating circulation circuit 11 to forcibly circulate the water. When the hot water supply operation is performed for a long time in this hot water filling state, the bath water in the bath heat exchanger 4 is heated, and the electric three-way valve of the bath reheating circuit 11 is stopped. The pressure concentrates on the outgoing pipe 13 side where no 18 is provided, and the pressure in the bath heat exchanger 4 abnormally rises, so that the bathtub water immediately boils, and the steam is generated along with the boiling sound in the circulation port 19 of the bathtub 12. Symptoms such as getting out of the room occurred.

[0014]

The present invention pays attention to this point,
In order to solve the above-mentioned drawbacks, in particular, the configuration includes a hot water supply circuit for heating water from a water pipe and supplying hot water from a hot water supply pipe, a bath reheating circuit for circulating and heating water in a bathtub, the hot water supply circuit and the bath. A fin tube type heat exchanger for heating and exchanging heat with a reheating circuit by a common burner, and a bath water bath branched from the hot water supply pipe of the hot water supply circuit and connected to the bath reheating circuit via an electric three-way valve. When the circuit and the bath reheating operation, the bath heating circuit side of the electric three-way valve is closed to make the reheating state communicate with the bath reheating circuit,
Further, during the bath filling operation, control is performed to close the heat exchanger side of the bath supplementary heating circulation circuit of the electric three-way valve and make the bath tub side of the bath supplementary heating circulation circuit communicate with the bath filling circuit. Means, the control means holds the electric three-way valve in the filling state for a certain time at the start of the hot water supply independent operation, and furthermore, the control means controls the electric three-way valve at the time when the hot water supply alone operation exceeds the certain time. It is intended to be in a reheating state.

[0015] In the second aspect of the present invention, in particular, the configuration includes a hot water supply circuit for heating and supplying hot water from a water pipe, a hot water supply circuit for heating and supplying hot water from a water pipe, and circulating water in a bathtub. A bath reheating circuit for heating, a fin tube type heat exchanger for exchanging heat and heat between the hot water supply circuit and the bath reheating circuit with a common burner, and a bath reheating device branched from a hot water supply pipe of the hot water supply circuit A bath water filling circuit connected to the circulation circuit via an electric three-way valve, and in a bath reheating operation, the bath water filling circuit side of the electric three-way valve is closed to make the reheating state communicate with the bath reheating circuit. In addition, during the bath filling operation, the heat exchanger side of the bath supplementary heating circuit of the electric three-way valve is closed, and the bath filling side circuit of the bath supplementary heating circuit is communicated with the bath filling circuit. Control means, Serial control means are those when the single hot water supply operation that was switched alternately every predetermined time and status reheating and hot water filling state the electric three-way valve.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Even if the hot water supply alone operation is started immediately after the completion of the bath reheating operation, the circulation of the bathtub water in the bath reheating circuit 11 by the inertia force is performed by the electric three-way valve 18 for the bath reheating circulation. The bath heat exchanger 4 side of the circuit 11 is closed, and the bath reheating circuit 4 is closed in the middle of the bath reheating circuit 11 so that the bathtub 12 side of the bath reheating circuit 11 communicates with the bath reheating circuit 20. Therefore, the bathtub water is not heated further and does not greatly exceed the bath set temperature.

Further, after a certain period of time has passed since the electric three-way valve 18 was brought into the hot water filling state as described above during the hot water supply alone operation, the electric three-way valve 18 was closed on the bath hot water filling circuit 20 side, and the bath additional heating circuit was closed. In a reheating state in which the heat exchanger 11 communicates, the pressure rise of the bath heat exchanger 4 is released from the forward pipe 13 and the return pipe 14 of the bath reheating circuit 11 to prevent an abnormal pressure rise in the bath heat exchanger 4 and a boiling sound is generated. Steam in the bathtub 1
It is possible to prevent the occurrence of a symptom such as getting out of the second circulation port 19, and further to prevent the bath heat exchanger 4 from being damaged due to an increase in pressure.

Further, when the hot water supply independent operation is started, the electric three-way valve 18 is closed on the side of the bath heat exchanger 4 of the bath reheating circuit 11, and the bath 1 of the bath reheating circuit 11 is closed.
A hot water filling state connecting the second side and the bath hot water filling circuit 20,
The bath water filling circuit 20 is closed to alternately switch to the reheating state in which the reheating circuit for communicating with the bath reheating circuit 11 is communicated at regular intervals, so that abnormal pressure increase in the bath heat exchanger 4 is prevented and the reheating is performed. The bathtub water does not significantly exceed the bath set temperature by hindering the natural circulation of the bathtub water in the firing circuit 11.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a fin tube type one-can, two-channel water heater with reheating function according to the present invention will be described with reference to the drawings. Note that the same components as those in the conventional example are denoted by the same reference numerals, description thereof will be omitted, and characteristic portions of the present invention will be described.

Reference numeral 27 denotes a control means for controlling the one-can-two-channel water heater with reheating function, which controls the driving of each load by the input of the remote controller 26 and the input of each sensor in the same manner as in the conventional example. Bath automatic operation by hot water supply operation, bath hot water filling operation and bath reheating operation is performed, and the electric three-way valve 18 is held in the hot water filling state shown in FIG. The electric three-way valve 18 is brought into the reheating state shown in FIG. 6 when the isolated operation exceeds the predetermined time.

The operation of the control means 27 will be described with reference to a time chart shown in FIG. At the start of the time chart, the bath supplementary heating operation is being performed by the automatic bath operation, so that the solenoid valve 22 of the bath filling circuit 20 is closed and the bath filling circuit 20 is disconnected, and the electric three-way valve 18
Is circulating and heating the bathtub water in a reheating state. Here, when the hot water tap is opened and the hot water supply operation is started, the bath reheating operation and the hot water supply operation are performed in parallel. Next, when the temperature of the bathtub water reaches the bath set temperature, the circulation pump 17 is stopped, the bath reheating operation ends, and only the hot water supply operation is continued.

When the bath reheating operation is completed and the operation shifts to the hot water supply only operation, the electric three-way valve 18 is switched to a hot water filling state for forcibly stopping the circulation of the bath water in the bath reheating circuit 11, and for a certain period of time. Start counting (for example, 1 minute). During the counting of the certain time, the bath reheating circuit 11 is closed halfway and the bath water in the bath heat exchanger 4 performs unnecessary heat exchange, so that the pressure in the bath heat exchanger 4 increases. After a certain period of time, the electric three-way valve 18 is switched to the reheating state, and the pressure in the bath heat exchanger 4 escapes through the forward pipe 13 and the return pipe 14 of the bath reheating circulation circuit 11. This prevents an abnormal increase in the pressure in the bath heat exchanger 4 during the hot water supply operation alone, prevents the occurrence of a symptom such as steam coming out of the circulation port 19 of the bathtub 12 together with the boiling sound, and further prevents the bath due to the pressure increase. This prevents the heat exchanger 4 from being damaged.

After the elapse of a predetermined time, the electric three-way valve 18 is maintained in the hot state until the operation of the hot water supply operation alone is completed. However, the present invention is not limited to this. The control may be alternately switched to the fired state at regular intervals, so that even when the bathtub 12 is at a position higher than the bath heat exchanger 4, the electric three-way valve 18 is kept in the bathing state for a fixed period of time. The natural circulation of bath water in the bath reheating circuit 11 by heating the bath water in the heat exchanger 4 is prevented, so that the bath water is prevented from being further heated and exceeding the bath set temperature, and The electric three-way valve 18 is alternately fired with the tensioned state to prevent an abnormal rise in the pressure in the bath heat exchanger 4 and to prevent the occurrence of a symptom such as steam coming out of the circulation port 19 of the bathtub 12 together with the boiling sound. Bath heat exchanger by the pressure rise in the 4
It is intended to prevent breakage.

Further, the present invention is not limited to this embodiment. For example, as shown in FIG. 3, the hot water supply heat exchanger 28 and the bath heat exchanger 29 have a fin tube type one can A waterway heat exchanger may be used, and the electric three-way valve 18 may be provided in the forward pipe 13 of the bath reheating circuit 11. In this case, the reheating state of the electric three-way valve 18 is determined by the bath water filling circuit 20. Is closed and the outgoing pipe 13 of the bath reheating circuit 11 is communicated, and the state of hot water of the electric three-way valve 18 is closed by closing the bath heat exchanger 29 side of the outgoing pipe 13 of the bath reheating circulation circuit 11. The tension circuit 20 communicates with the outward tub 13 on the side of the bathtub 12.

[0025]

As described above, according to the present invention, even when the hot water supply alone operation is started immediately after the completion of the bath reheating operation, the bathtub water is circulated by the inertial force, and the electric three-way valve is filled with the bath. Since the reheating circuit is forcibly stopped by closing it halfway, the bathtub water will not be heated further and will greatly exceed the bath set temperature,
After a certain period of time has passed since the electric three-way valve was placed in the hot water state, the electric three-way valve was put in the reheating state, and the pressure in the bath heat exchanger was released from the bath reheating circuit to prevent abnormal rise in the pressure in the bath heat exchanger. In addition, it is possible to prevent the occurrence of a symptom such as steam coming out of the circulation port of the bathtub together with the boiling sound, and further to prevent the bath heat exchanger from being damaged due to an increase in pressure.

Further, when the hot water supply independent operation is started, the electric three-way valve is alternately switched between the hot water filling state and the reheating state at regular intervals, so that the circulation of the bathtub water due to the inertial force is forcibly stopped. At the same time, the natural circulation that occurs due to the rise in the temperature of the bath water in the bath heat exchanger can be forcibly stopped, and the pressure in the bath heat exchanger is released from the bath reheating circuit to release the pressure inside the bath heat exchanger. This can prevent an abnormal rise in pressure, prevent the occurrence of symptoms such as steam coming out of the circulation port of the bathtub together with the boiling sound, and further prevent the bath heat exchanger from being damaged due to the pressure rise.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a time chart showing the operation of one embodiment of the present invention.

FIG. 3 is a configuration diagram of another embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional example.

FIG. 5 is a diagram showing a flow of the bath hot water filling operation.

FIG. 6 is a diagram showing a water flow direction in a reheating state of the electric three-way valve.

FIG. 7 is a view showing a water flowing direction in a hot water filling state of the electric three-way valve.

[Explanation of symbols]

 2 Burner 5 Heat exchanger 6 Hot water supply circuit 8 Hot water supply pipe 11 Bath reheating circuit 18 Electric three-way valve 20 Bath hot water filling circuit 27 Control means

Claims (2)

[Claims] 1. A hot water supply circuit for heating water from a water pipe and supplying hot water from a hot water supply pipe, a bath reheating circuit for circulating and heating water in a bathtub, and the hot water supply circuit and the bath reheating circuit in common A fin tube type heat exchanger for exchanging heat with a burner, a bath water filling circuit branched from a hot water supply pipe of the hot water supply circuit and connected to a bath reheating circuit through an electric three-way valve, and a bath reheating operation At the time, the bath water heating circuit side of the electric three-way valve is closed to make it a reheating state in which the bath reheating circuit is connected, and during the bath water heating operation, the heat exchange of the bath reheating circuit of the electric three-way valve is performed. Control means for closing the water heater side to bring the bath tub side of the bath reheating circuit into communication with the bath water filling circuit, and the control means is provided with the electric three-way for a certain time at the start of the hot water supply independent operation. Fill the valve with hot water A single-can, two-channel water heater with reheating function, wherein the electric three-way valve is set to the reheating state when the hot water operation alone exceeds the predetermined time. 2. A hot water supply circuit for heating and supplying hot water from a water pipe, a bath reheating circuit for circulating and heating water in a bathtub, and a common burner for the hot water supply circuit and the bath reheating circuit. A fin tube type heat exchanger for performing heat exchange, a bath filling circuit branched from a hot water supply pipe of the hot water supply circuit and connected to a bath reheating circuit through an electric three-way valve, and the Close the bath-filling circuit side of the electric three-way valve to the reheating state to communicate with the bath reheating circuit, and also set the heat exchanger side of the bath reheating circuit of the electric three-way valve during the bath-heating operation. Control means for closing the bath to make the bath tubing circuit of the bath reheating circuit and the bath water filling circuit communicate with each other, and wherein the control means drives the electric three-way valve to the bathing state during hot water supply alone operation. At a certain time to the fired state A one-can-two-channel water heater with reheating function characterized by being switched alternately every time.