JPH1114078A - Bath hot water feeder device with heating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of decay in water by a method wherein a water feeding three-way changing-over valve is changed over to cause a water falling pipe to communicate with a returning pipe returning to a heat exchanger, a hot water discharging three-way changing-over valve is changed over to cause a going pipe to communicate with a supply pipe, thereafter a water falling operation is carried out to replace circulating water within a heating circuit with tap water. SOLUTION: When an operation for replacing circulating water in a heating circuit is started, a second water feeding three-way changing-over valve 11 is changed over and a water falling communication pipe 12 communicates with a bath water returning communication pipe 91. Then, a first water feeding three-way changing-over valve 6 is changed over to cause the bath water returning communication pipe 91 to communicate with a returning pipe 3 and further a hot water discharging three-way changing- over valve 41 is changed over to cause a going pipe 4 to communicated with a supply pipe 8 connected to a heating load such as a radiator or the like, thereby a water amount adjusting valve 22 and a water falling valve 13 in a hot water discharging pipe 19 for general hot water feeding are opened, a circulating pump 5 is driven and the circulating water within the heating circuit is replaced with clean tap water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water heater with a heating function using the same heat exchanger for a heating circuit and a bath heating circuit.

[0002]

2. Description of the Related Art Conventionally, a bath water heater with a heating function using the same heat exchanger for a heating circuit and a bath heating circuit has been used. Generally, in a bath water heater with a heating function that uses the same heat exchanger for the heating circuit and the bath heating circuit, the heat exchanger and the circulation pump of the heating device use a three-way switching valve for the heating circuit and the bath heating circuit. Connected via
The heating operation and the bath heating are switched by switching the three-way switching valve between the heating operation and the bath heating.

However, the bath heating circuit is communicated with the bathtub, and water contaminated by bathing circulates through a heat exchanger and a circulation pump of the heating device, and the contaminated water circulates in the heating circuit during a heating operation. Alternatively, if the heating operation is not performed for a long time in the state where the heating circuit is switched to the heating circuit side, various bacteria may propagate in the heating circuit (water rot). There was a risk of flowing into the bath circuit. To solve the above problem, for example,
The heating device described in JP-A-8-14589 is
In a heating device that circulates a heat medium such as hot water through a simple floor mat, the temperature of the heat medium is raised to a temperature higher than the temperature at which sanitary pests such as mites are killed, and the heat medium is circulated.

[0004]

However, the above-mentioned conventional heating apparatus has the following problems. Since the heating medium is circulated by raising the temperature to a temperature higher than the death temperature of the sanitary pest, the temperature of the heating medium is higher than the heating set temperature, and during the heating operation, the heating medium temperature is too high for the heating user, There was a problem that comfortable heating could not be obtained.

An object of the present invention is to provide a bath water heater with a heating function that uses the same heat exchanger for a heating circuit and a bath heating circuit and that can suppress the occurrence of water rot. To provide.

[0006]

In order to achieve the above object, a bath water heater with a heating function of the present invention is switchably connected to a heat exchanger and a circulation pump of a heating device via a three-way switching valve. In addition to having a heating circuit and a bath heating circuit, in a bath water heater with a heating function having a function of dropping into a bathtub, a three-way switching valve for incoming water is switched to connect the dropping pipe to a return pipe to a heat exchanger,
After switching the hot water three-way switching valve to connect the outgoing pipe to the heating outgoing pipe, a dropping operation is performed to replace the circulating water in the heating circuit with clean water so that the circulating water in the heating circuit is clean. Since it is replaced by water, it is possible to suppress the overgrowth of water rot due to stagnation of circulating water, and it is also possible to use it for the replenishing action of circulating water in the heating circuit. The valve can be dispensed with, the structure can be simplified, and the cost can be reduced. In addition, when the operation of the bath heating circuit is completed, by performing the dropping operation before switching the three-way switching valve to the heating circuit side, when the three-way switching valve can be switched to the heating circuit side, the bath heating shared circuit portion is always used. That is, the return pipe, the heat exchanger for bath heating, and the outgoing pipe are filled with clean water, so that dirty water from the bath does not flow into the heating circuit, and water rot can be prevented. Whenever the operation of the bath heating circuit is completed, the above-mentioned water rot prevention operation is performed, so that the water rot prevention operation is performed only within the range that meets the user's operation request, and unexpected Preventive operation is not started. Further, after the bath is dropped into the bath at the start of the bath heating operation, the three-way switching valve is switched to the heating circuit side to operate the circulation pump for a predetermined time, and then the three-way switching valve is switched to the bath heating circuit side, thereby changing the bath. Before starting the heating operation on the heating circuit side, by switching the three-way switching valve to the heating circuit side and operating the circulation pump, every time a bath is used, the circulating water in the heating circuit is partially replaced with clean water. Therefore, water rot can be reliably prevented, and the water rot prevention operation is performed each time the bath heating circuit is started and the operation of dropping into the bathtub is performed. The water rot prevention operation is performed only in the area where the user met, and the water rot prevention operation is not suddenly started when the user does not intend.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 4, an example of a water heater to which the present invention is applied will be described. The water heater 1 includes a bath heater 1 and a general hot water heater 16, and the bath heater 1 is heated by a combustor 23. A bath heat exchanger 2 is provided, a general hot water supply 16 is provided with a hot water supply heat exchanger 17 which is heated by a combustor 24, and the combustors 23 and 24 have gas supply pipes. 25 are connected.

A return pipe 3 is provided at the entrance side of the heat exchanger 2 for bath heating.
Is connected to the outlet pipe, the return pipe 3 is provided with a circulation pump 5, and the return pipe 3 is connected to one of the passages of the first three-way switching valve 6. The outflow pipe 4 is connected to one passage of a tapping three-way switching valve 41, and the other switching side passage of the tapping three-way switching valve 41 is connected to a heating outflow pipe 8 connected to a radiator or the like and a bathtub. The bath pipes 10 are connected to each other.

A heating return communication pipe 72 and a bath return communication pipe 91 are connected to the other switching side passage of the first water inlet three-way switching valve 6, and the heating return communication pipe 72 is connected to the heating return pipe via an expansion tank 71. 7 is connected to the expansion tank 71.
An overflow pipe 71A is provided, a heating water supply electromagnetic valve 74 is provided, and a heating water supply pipe 73 connected to the water supply pipe 18 is connected. Bath return connection pipe 91
Is connected to one of the passages of the second three-way switching valve 11, and the other return-side passage of the third three-way switching valve 11 has a bath return pipe 9 communicating with the bathtub and a drop valve 13.
Is connected to the drop connecting pipe 12 having The drop valve 13 is connected to a drop pipe 15 via a drop water flow rate sensor 14, and the drop pipe 15 is connected to a hot water pipe 19 from a general hot water heater 16.

Heat exchanger 1 for hot water supply of hot water heater 16 for general hot water supply
7, the water flow sensor 181 and the feedwater temperature sensor 1
A hot water supply pipe 18 having a hot water supply temperature sensor 191, a hot water supply temperature sensor 192, and a water flow control valve 22 on the outlet side is connected to the hot water supply pipe 18. A bypass pipe 20 for connecting the water supply pipe 18 to the water supply pipe 19 is provided. The bypass pipe 20 is provided with a bypass valve 21. A controller 26 controls various valves and a circulating pump.

In operation, during the heating operation, the first inlet three-way switching valve 6 is switched to connect the heating return connection pipe 72 to the return pipe 3 and the outlet three-way switching valve 41 is switched to connect the outgoing pipe 4 to the radiator. The circulating pump 5 is driven to burn the combustor 23 by communicating with the heating going pipe 8 connected to a heating load such as the above. During the bath heating operation, the second inlet three-way switching valve 11 is switched to switch the bath return pipe 9.
Is connected to the bath return connecting pipe 91, the first inlet three-way switching valve 6 is switched to connect the bath returning connecting pipe 91 to the return pipe 3, and the hot water three-way switching valve 41 is switched to connect the going pipe 4 to the bath going pipe 10. , And drives the circulation pump 5 to burn the combustor 23.

At the time of the dropping operation, the second inlet three-way switching valve 11 is switched to connect the sinking connection pipe 12 to the bath return connection pipe 91, and the first inlet three-way switching valve 6 is switched to switch the bath return connection pipe 91 to the return pipe. 3 and the hot water three-way switching valve 41 is switched to connect the outflow pipe 4 to the bath outflow pipe 10, and then the drop valve 13 and the water flow control valve 22 of the hot water tapping pipe 19 are opened to open the circulation pump 5. Is driven to burn the combustor 23. During the general hot water supply operation, the opening degree of the bypass valve 21 is adjusted to adjust the temperature of the hot water from the hot water supply pipe 19, the water amount adjustment valve 22 is opened, and the combustor 24 is burned.

A first embodiment of the present invention will be described with reference to the flowchart of FIG. When the operation of exchanging the circulating water in the heating circuit is started, the second inlet three-way switching valve 11 is switched so that the drop connecting pipe 12 communicates with the bath return connecting pipe 91. Next, the first water inlet three-way switching valve 6 is switched to connect the bath return connection pipe 91 to the return pipe 3, and the hot water three-way switching valve 41 is switched to connect the outgoing pipe 4 to heating connected to a heating load such as a radiator. The water flow control valve 22 and the drop valve 13 of the hot water supply pipe 19 are communicated with the outflow pipe 8.
Is opened, and the circulation pump 5 is driven.

Thus, the hot water from the dropping pipe 15 (when the general hot water supply unit 16 is in the hot water supply operation) or the water (when the general hot water supply unit 16 is stopped)
Drop-in valve 13, drop-in connecting pipe 12, second three-way inlet valve 11, bath return connecting pipe 91, first three-way inlet valve 6, return pipe 3, heat exchanger 2 for bath heating, outgoing pipe 4, and three-way outlet The gas flows into the expansion tank 71 via the heating load such as the valve 41, the heating pipe 8 and the radiator, and the heating return pipe 7, and flows out of the circuit from the overflow pipe 71A.

By this operation, the circulating water in the heating circuit is replaced with clean tap water, so that it is possible to suppress the overgrowth of water rot due to the circulating water staying. Further, since it can be used for the replenishing action of the circulating water in the heating circuit, the heating water replenishment pipe 73 and the heating water replenishment solenoid valve 74 can be dispensed with, the structure can be simplified, and the cost can be reduced. Can be achieved.

A second embodiment of the present invention will be described with reference to the flowchart of FIG. When the additional heating operation on the bath heating circuit side, the air purge operation, etc. are completed, and when the bath-side circulation operation of the circulation pump 5 is completed, before the first water inlet three-way switching valve 6 and the hot water three-way switching valve 41 are switched to the heating circuit side. After the drop valve 13 is opened and dropped into the bath heating circuit by a predetermined amount Q liter (for example, 10 liters) in a state of being connected to the bath heating circuit side, the first inlet three-way switching valve is provided. 6 and the hot water three-way switching valve 41 are switched to the heating circuit side to shift to a standby state in which the combustion operation and the operation of the circulation pump are stopped.

According to this configuration, the first water inlet three-way switching valve 6
When the hot water three-way switching valve 41 is switched to the heating circuit side, clean water is always supplied to the bath heating shared circuit portion, that is, the return pipe 3 (including the circulation pump 5), the bath heating heat exchanger 2, and the outgoing pipe 4. Since it is filled, dirty water of the bath does not flow into the heating circuit, and water rot can be prevented. In addition, every time the operation of the bath heating circuit is completed and the bath-side circulation operation of the circulation pump 5 is completed, the above-mentioned water rot prevention operation is performed. Therefore, the water rot prevention operation is performed only within a range that meets the user's operation request. The operation for preventing water rot is not suddenly started when the user does not intend.

A third embodiment of the present invention will be described with reference to the flowchart of FIG. When the bath automatic operation is started, the drop valve 13 is opened and the drop into the bath heating circuit is set to a predetermined amount Q liter (for example, 10 liter).
After that, the first inlet three-way switching valve 6 is switched to connect the heating return connection pipe 72 to the return pipe 3, and the third outlet switching valve 41 is switched to connect the outgoing pipe 4 to the heating outgoing pipe 8, ie, 1 Three-way switching valve 6 for incoming water and three-way switching valve 41 for hot water
To the heating circuit side.

The circulating pump 5 is started, the operation is continued for a predetermined time t, and then the circulating pump 5 is stopped.
The first water inlet three-way switching valve 6 and the hot water outlet three-way switching valve 41 are switched to the bath heating circuit side, that is, the first water inlet three-way switching valve 6 is switched so that the bath return connection pipe 91 communicates with the return pipe 3, and the hot water outlet three-way switching valve 41 To change the outgoing pipe 4 to the outgoing pipe 1
Connect to 0. Then, while operating the circulation pump 5, the combustion of the combustor 23 is started, and the circulation heating of the bath heating circuit is started.

According to this configuration, when the automatic bath operation is started, after the water is dropped into the bath and before the heating operation on the side of the bath heating circuit is started, the first and second three-way inlet water switching valves 6, 11 are started. To the heating circuit side and switch the circulation pump 5
By driving, the circulating water in the heating circuit is partially replaced with clean water every time a bath is used, so that water rot can be prevented. In addition, the water rot prevention operation is performed every time the bath heating circuit side operation is started and the operation of dropping into the bath tub is performed, so that the water rot prevention operation is performed only within a range that meets the user's operation request. The operation for preventing water rot is not suddenly started when the user does not intend.

[0021]

Since the present invention is constructed as described above, it has the following effects. In the bath water heater with a heating function, after switching the water inlet three-way switching valve to communicate the dropping pipe to the return pipe to the heat exchanger and switching the water tapping three-way switching valve to connect the outgoing pipe to the heating outflow pipe By performing the dropping operation and replacing the circulating water in the heating circuit with clean water, the circulating water in the heating circuit is replaced with clean clean water. Can be used for the circulating water supply action of the heating circuit, so that the heating water supply pipe and the heating water supply solenoid valve can be eliminated, the structure can be simplified, and the cost can be reduced. Down can be planned. In addition, when the operation of the bath heating circuit is completed, by performing the dropping operation before switching the three-way switching valve to the heating circuit side, when the three-way switching valve can be switched to the heating circuit side, the bath heating shared circuit portion is always used. That is, the return pipe, the heat exchanger for bath heating, and the outgoing pipe are filled with clean water, so that dirty water from the bath does not flow into the heating circuit, and water rot can be prevented. Each time the operation of the bath heating circuit is completed, the above-mentioned water rot prevention operation is performed.Therefore, the water rot prevention operation is performed only within a range that meets the user's operation request. Preventive operation is not started. Further, after the bath is dropped into the bath at the start of the bath heating operation, the circulation pump is operated for a predetermined time by switching the three-way switching valve to the heating circuit side, and then the three-way switching valve is switched to the bath heating circuit side, thereby changing the bath. Before starting the heating operation on the heating circuit side, by switching the three-way switching valve to the heating circuit side and operating the circulation pump, every time a bath is used, the circulating water in the heating circuit is partially replaced with clean water. Therefore, water rot can be reliably prevented, and the water rot prevention operation is performed every time the bath heating circuit is started and the operation of dropping into the bathtub is performed. The water rot prevention operation is performed only in the area where the user met, and the water rot prevention operation is not suddenly started when the user does not intend.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing a second embodiment of the present invention.

FIG. 3 is a flowchart showing a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a bath water heater with a heating function to which the present invention is applied.

[Explanation of symbols]

1. Hot water heater for bath heating, 2, heat exchanger for bath heating, 5
Circulation pump 6 1st water inlet 3 way switching valve, 7 heating return pipe, 8 heating water return pipe, 9 bath return pipe 10 bath water return pipe, 11 2nd water inlet 3 way switching valve, 13
Drop valve 15 Drop pipe, 16 Water heater for general hot water supply, 41
Hot water supply three-way switching valve 73 Heating water supply pipe, 74 Heating water supply solenoid valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hisato Kataoka 93 Edocho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz Co., Ltd. (72) Inventor Toshiya Tatsumura 93 Edocho, Chuo-ku, Kobe, Hyogo Co., Ltd. Within Noritz (72) Inventor Hirokazu Kuwahara 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside (72) Inventor Koji Kimura 93, Edo-cho, Chuo-ku, Kobe, Hyogo, Japan Inside Noritz Co., Ltd.

Claims (3)

[Claims] 1. A heat exchanger and a circulation pump of a heating device,
In a bath water heater with a heating function having a heating circuit and a bath heating circuit that are switchably connected via a three-way switching valve and having a function of dropping into a bathtub, the drop-in pipe is switched by switching a water inlet three-way switching valve. Connect the return pipe to the heat exchanger and switch the hot water three-way switching valve to connect the outgoing pipe to the heating outgoing pipe, and then perform a dropping operation to replace the circulating water in the heating circuit with clean water. Bath water heater with heating function. 2. The heat exchanger and the circulation pump of the heating device,
With a heating circuit and a bath heating circuit switchably connected via a three-way switching valve, and in a bath water heater with a heating function having a function of dropping into a bathtub, when the operation of the bath heating circuit is completed, A bath water heater with a heating function, characterized in that a drop operation is performed before switching the three-way switching valve to the heating circuit side. 3. The heat exchanger and the circulation pump of the heating device,
In a bath water heater with a heating function having a heating circuit and a bath heating circuit switchably connected via a three-way switching valve and having a function of dropping into a bath tub, the dropping into the bath tub is performed at the start of bath heating operation. After
A bath water heater with a heating function, characterized in that the three-way switching valve is switched to the heating circuit side to operate the circulation pump for a predetermined time, and then the three-way switching valve is switched to the bath heating circuit side.