JP3385817B2 - Hot water heating combined bath heating device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heating / bath heating device in which a hot water heating circulation circuit and a bath circulation circuit are connected to a heating device through switching means.

[0002]

2. Description of the Related Art Generally, a hot water heating circulation circuit and a bath circulation circuit are connected to a single heating device via a switching means, and hot water heating is performed by switching the bath heating operation and hot water heating operation by switching the switching means. In the dual-use bath heating device, when performing high-capacity operation with hot water heating, or when installing a radiator on the bathroom ceiling and using it as a bathroom heating / dryer, the circulating hot water temperature of the hot water heating circulation circuit is high (for example, 80 ℃) is set. Normally, when a bath heating operation command is input during the hot water heating operation, the hot water heating operation is interrupted and switched to the bath heating operation.

[0003]

However, in the above-mentioned conventional hot water heating / bath heating apparatus, when the bath heating operation is switched to during the hot water heating operation at the high hot water temperature or immediately thereafter, a hot water heating circulation circuit is provided. There was a risk that hot water in the common part of the bath circulation circuit would flow into the bathtub and cause discomfort to the user. Also, because hot water flows into the bathtub or the heating part is hot, there is a false detection of hot water temperature that is higher than the actual hot water temperature in the bathtub immediately after the start of reheating. There was a problem that the additional heating operation would stop early. In order to solve this problem, for example, the one described in Japanese Patent Application Laid-Open No. 1-142342 discloses an additional heating in consideration of the fact that the hot water temperature is erroneously detected immediately after the additional heating is started and the additional heating operation is stopped early. The heating is forcibly continued for a certain period from the start, and the correct hot water temperature is detected in a stable state of the hot water in the bathtub. If the bath heating switch is accidentally touched when the bath is empty (for example, while cleaning the bathtub), hot water will flow out into the bathtub, which may cause discomfort.

An object of the present invention is to provide hot water heating capable of lowering the hot water temperature flowing into a bath when the hot water heating operation is performed at a high hot water temperature or when the bath heating operation is switched to immediately after the hot water heating operation is stopped. It is to provide a combined bath heating device.

[0005]

In order to achieve the above object, a hot water heating / bath heating apparatus of the present invention comprises a circulation pump, and an air supply fan via a switching means between a hot water heating circulation circuit and a bath circulation circuit. In a hot water heating / bath heating device connected to a heating device having a heating device, when the bath heating operation is switched to during hot water heating operation or immediately after the hot water heating operation is stopped, combustion of the heating device is stopped while the circulation pump and the feed pump are connected. The air fan is operated, and after it is determined from the switching means that the hot water temperature in the pipeline on the heating device side has decreased, the operation switches to the bath reheating operation. If the bath heating mode is switched to during hot water heating operation or immediately after the hot water heating operation is stopped, the heating device is stopped and the circulation pump and the air supply fan are operated, and a predetermined time has elapsed. By doing so, after the switching means determines that the temperature of the hot water in the pipeline on the heating device side has dropped, the bath heating operation may be started.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. In FIG. 2, the heating device A includes a heating side heat exchanger 1, a burner 2 and an air supply fan 16, and the inlet side and the outlet side of the heating side heat exchanger 1 are three-way switching valves (switching means).
7 and 8, the three-way switching valves 7 and 8 are connected to the bathtub 3 by the bath outflow pipe 4 and the bath return pipe 5, and the radiator 6 is connected by the heating outflow pipe 9 and the heating return pipe 10. Has been done. Between the inlet side of the heating side heat exchanger 1 and the three-way switching valve 8, a circulation pump 11, a hot water temperature detection thermistor 12 and a water amount detection device 13 for detecting the amount of circulating hot water are installed.
The hot water temperature detection thermistor 12 and the water amount detection device 13 are the control device 15
The control device 15 outputs a control signal to the circulation pump 11, the three-way switching valves 7 and 8, the gas control valve 14 provided in the gas passage to the burner 2, and the air supply fan 16.

By switching the three-way switching valves 7 and 8, the heating side heat exchanger 1 is connected to the bath outflow pipe 4 and the bath return pipe 5 during the bath reheating operation, the circulation pump 11 is operated, and the bathtub 3 is connected to the bathtub 3. The hot water is circulated to perform the reheating operation of the bath, while the heating side heat exchanger 1 is connected to the radiator 6 through the heating outflow pipe 9 and the heating return pipe 10 during the heating operation, and the radiator 6 is operated by the circulation pump 11. The hot water is circulated to perform heating operation. When the bath heating operation and the heating operation are stopped, the circulation pump 11 and the air supply fan 16 are stopped, but the air supply fan 16 is at least after combustion of the burner 2 is completed. Perform post-purge operation of.

The control operation at the time of switching from the heating operation to the bath reheating operation will be described with reference to the flowchart of FIG. When the bath heating switch (not shown) is turned on,
It is determined whether or not the heating operation is being performed. If the heating operation is being performed, the combustion of the burner 2 is stopped while the circulation pump 11
And the operation of the air supply fan 16 is continued for a predetermined time t (for example, 25 seconds). The circulation pump 11 and the air supply fan 16 continue to operate (burner 2 stops combustion) for a certain time t.
After (25 seconds) has elapsed, it is determined that the hot water temperature inside the heating side heat exchanger 1 and the pipes between the heating side heat exchanger 1 and the three-way switching valves 7 and 8 has been lowered, and the three-way switching valve 7 , 8 is switched to the reheating operation side, the heating side heat exchanger 1 is connected to the bath outflow pipe 4 and the bath return pipe 5 to start the combustion of the burner 2 to shift to the bath reheating operation, and predetermined. When the temperature reaches the set temperature Ts, the bath heating operation ends.

If the heating operation is stopped when the bath heating operation switch is turned on, a predetermined time (for example, post-purge operation time tp + α, where α ≧ 0) has elapsed after the heating is stopped. As it is, the three-way switching valve 7, 8
Is switched to the bath heating operation side to shift to the heating operation. On the other hand, when the predetermined time (tp + α) has not elapsed after the heating operation is stopped, that is, immediately after the heating operation is stopped, the circulation pump 11 and the air supply fan 16 are started to operate for a certain time t (25 seconds). The rear three-way switching valves 7 and 8 are switched to the bath heating operation side to shift to the heating operation.

According to this structure, when the bath heating operation is switched to during the hot water heating operation or immediately after the hot water heating operation is stopped, the air supply fan 16 is operated for a certain time t to operate the heating side heat exchanger 1. By cooling and operating the circulation pump 11 to circulate the hot water in the heating side heat exchanger 1 to radiate heat, the temperature of the hot water flowing out into the bath 3 is low (for example,
The bath heating operation can be started by determining that the temperature has reached 75 ° C to 63 ° C. It should be noted that while the combustion of the heating device is stopped, the circulation pump and the air supply fan are operated, and it is confirmed that the hot water temperature in the pipeline on the heating device side has dropped from the switching means after a predetermined time has elapsed. By making the determination, the cost can be reduced with a simple configuration without using an expensive thermistor or the like.

In the above embodiment, the circulation pump
Although the decrease in the hot water temperature on the heating side heat exchanger 1 side is determined by the operating time of 11 and the air supply fan 16, the detected temperature of the hot water temperature detection thermistor 12 or the heating side heat exchanger 1 or its outlet side After the hot water temperature detection thermistor is provided and the detected hot water temperature of the heating side heat exchanger 1 or its outlet side falls below a preset hot water temperature To, the three-way switching valves 7, 8 are switched to the additional heating operation side for additional heating. The operation may be switched to the burning operation. In that case, if the hot water temperature in the pipeline is non-uniform and there is a local low temperature part, it may shift to bath heating operation even if the decrease in hot water temperature is insufficient in general. It is desirable to perform processing such as averaging the hot water temperature over time, or to provide a plurality of hot water temperature detection thermistors to detect the hot water temperature at a plurality of points in the pipeline at the same time. In this regard, in the above-mentioned embodiment,
After a certain period of time, the bath heating operation will be switched to.Therefore, even if the hot water temperature is not uniform, there is no danger of switching to the bath heating operation at an early stage, and the configuration is simple. Since it is not necessary to additionally provide it, the cost can be reduced.

[0012]

Since the present invention is constructed as described above, it has the following effects. When the bath heating operation is switched to during the hot water heating operation or immediately after the hot water heating operation is stopped, the bath heating operation is started by determining that the temperature of the hot water flowing into the bathtub has become low. There is no fear that hot water will be applied to the user or the bathtub cleaner to cause discomfort. It should be noted that while the combustion of the heating device is stopped, the circulation pump and the air supply fan are operated, and it is confirmed that the hot water temperature in the pipeline on the heating device side has dropped from the switching means after a predetermined time has elapsed. By making the determination, the cost can be reduced with a simple configuration without using an expensive thermistor or the like.

[Brief description of drawings]

FIG. 1 is a flowchart showing the operation of the present invention.

FIG. 2 is a structural diagram of a hot water heating / bath heating device to which the present invention is applied.

[Explanation of symbols]

A heating device, 1 heating side heat exchanger, 2 burners, 3
Bathtub 4 Bath outflow pipe, 5 Bath return pipe, 6 Radiator 7,8 Three-way switching valve (switching means), 9 Heating outflow pipe, 10
Heating return pipe 11 Circulation pump, 12 Hot water temperature detection thermistor, 13 Water amount detection device 14 Gas control valve, 15 Control device, 16 Air supply fan

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Utsuko Yoshihiro 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo In Noritsu Co., Ltd. (56) Reference JP 4-222345 (JP, A) JP 3-125845 (JP, A) JP 5-23335 (JP, B2) JP 7-18557 (JP, B2) (JP 58) Fields investigated (Int.Cl. ⁷ , DB name) F24D 3/08

Claims (2)

(57) [Claims] 1. A hot water heating / bath heating apparatus comprising a circulating pump, wherein a hot water heating circulating circuit and a bath circulating circuit are connected to a heating device having an air supply fan through a switching means, during hot water heating operation or hot water heating. When switching to bath heating operation immediately after the heating operation is stopped, the combustion of the heating device is stopped while the circulation pump and the air supply fan are operated, and the hot water temperature in the pipeline on the heating device side decreases from the switching means. A bath heating device that also functions as a hot water heater, characterized in that after the determination is made, the bath heating operation is performed. 2. When the bath heating operation is switched to during the hot water heating operation or immediately after the hot water heating operation is stopped, the combustion of the heating device is stopped while the circulation pump and the air supply fan are operated to set a predetermined constant value. The hot-water heating / bath heating device according to claim 1, wherein the bath heating operation is started after a lapse of time.