JP3417184B2 - Combustion equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a hot water supply device having a hot water supply function, a heating function, and a bath reheating function.

[0002]

2. Description of the Related Art As a hot water supply device having a hot water supply function, a heating function, and a bath reheating function, at the time of reheating the bath,
By exchanging heat between the circulation channel for heating and the circulation channel for reheating the bath, the temperature of the hot water in the circulation channel for reheating the bath is raised, and when the hot water is supplied to the bathtub or when water is supplied, the water flow for bath hot water supply There has been a type in which hot water is supplied or water is supplied through a channel and a circulation channel for reheating the bath.

In the hot water supply device of this type,
When hot water is supplied or supplied through the hot water supply passage for bath hot water and the circulation passage for bath reheating, the heat exchange part of the circulation passage for heating the bath with the circulation passage for heating is also used as a water passage. It was That is, between the junction of the bath hot water supply flow passage and the bath reheating circulation flow passage and the bathtub, two water passages are formed by the bath reheating circulation flow passage, one of which is for heating. Although it passes through the heat exchange part with the circulation flow path and the other does not pass through the heat exchange part, since the cross-sectional area of the bath reheating circulation flow path is smaller than the cross-sectional area of the bath hot water supply flow path, It was devised to supply hot water or water quickly by using both water passages at the same time.

[0004]

However, in the above-described conventional hot water supply apparatus, when hot water or hot water is supplied to the bathtub during the heating operation, the hot and cold water flowing from the bath hot water supply flow passage to the bath reheating circulation flow passage. However, there is a problem that the temperature rises while passing through the heat exchange portion of the bath reheating circulation passage with the heating circulation passage, and the temperature of the hot water supplied to the bath becomes higher than the desired temperature. .

That is, the case of supplying hot and cold water to the bathtub includes, for example, so-called automatic bath hot water supply in which hot water is supplied to an empty bathtub, and so-called footbath for increasing the amount of hot water in the bathtub, for example. There is a case of so-called water supply that supplies water when the hot water in the bathtub is too hot. However, in the case of automatic bath hot water supply and supplemental hot water, the hot water supplied through the bath hot water flow passage is already at the set temperature. Since it is heated in this way, if it is further heated in the heat exchange part of the bath reheating circulation channel, hot water having a temperature higher than the set temperature will be supplied, which is inconvenient.
Also, in the case of water supply, water is supplied in order to lower the hot water temperature in the bathtub. Therefore, if hot water is supplied, the hot water temperature in the bathtub cannot be lowered, or even if it is possible, it is unnecessary. It required a large amount of hot water, and the hot water in the bathtub overflowed, which was inconvenient in any case.

The invention of the present application has been proposed in view of the above point, and increases the temperature of hot water supplied to a bathtub or the temperature of water supply through a bath-fired circulation channel that exchanges heat with a hot-water circulation channel. It is an object of the present invention to provide a combustion device that does not burn.

[0007]

In order to solve the above problems, the present invention takes the following technical means.

That is, the invention described in claim 1 of the present application is a hot water circulation flow path for circulating hot water, a bath reheating circulation flow path for taking out hot water from the bath and returning it to the bath, a hot water circulation flow path and a bath. A combustion device that has a heat exchanger that reheats the bath by exchanging heat with the reheating recirculation channel, and that supplies hot water or water to the bathtub via the bath reheating circulation channel In addition, when hot water is circulated in the hot water circulation flow passage, when hot water is supplied to or supplied to the bathtub, a hot water circulation flow passage water stop means is provided for stopping the circulation of the hot water in the hot water circulation flow passage. Is characterized by.

According to this combustion apparatus, for example, when the hot water circulation passage is used for heating, when hot water is supplied to the bathtub or water is supplied during the heating operation, the hot water circulation passage water supply stopping means is used to heat the hot water. Since the water flow in the circulation channel is stopped, there is no rise in the temperature of the hot water in the bath reheating circulation channel due to heat exchange with the hot water circulation channel, and hot water at an appropriate temperature is supplied to the bathtub. Of course, the hot water circulation channel is not limited to heating, but may be any other application.

As a specific example of the hot water circulation passage water stop means, for example, a thermal valve installed in the hot water circulation passage may be closed, or installed in the hot water circulation passage. The circulating pump may be stopped.

The invention described in claim 2 of the present application is
It has a hot water supply function, a heating function, and a bath reheating function,
During bath reheating, the temperature of the hot water in the bath reheating circulation channel is raised by exchanging heat between the heating circulation channel and the bath reheating circulation channel, and when hot or cold water is supplied to the bathtub, A combustion device for supplying hot water or water through a hot water supply passage for bath hot water and a circulation passage for bath reheating, which is a heating device for heating hot water in the circulation passage for heating, and a circulation passage for heating. Heating circulation channel that circulates the hot water and the heating circulation channel that bypasses the heat exchange part of the heating circulation channel with the bath reheating circulation channel, and the heating circulation channel. A heating valve for opening and closing a part bypassed by a heating valve, and when hot water or water is supplied to a bathtub during heating operation, first, the heating device for heating and the circulation pump for heating are stopped and the heating valve for heating is set. Open the valve closing operation of Then, when the closing operation of the heating thermal valve is completed, the heating control device that circulates the hot water for heating through the heating bypass passage by operating the heating device for heating and the circulation pump for heating. It is characterized by the provision of.

According to this combustion apparatus, when hot water or hot water is supplied to the bathtub during the heating operation, the heating control means first stops the heating device for heating and the circulation pump for heating, and at the same time, operates the heat valve for heating. Start the valve closing operation. That is, since the heating thermal valve is constituted by a thermal valve that is opened by the heat when the built-in heater is energized, it takes about 5 minutes to close the heating valve. By the time the valve closing operation of the heating valve is completed, the heating device for heating and the circulation pump for heating are stopped so that the circulation flow for bath reheating by heat exchange with the circulation channel for heating is stopped. It avoids the temperature rise of hot and cold water in the road. The reason for using a thermal valve that opens and closes slowly in this way is that it has superior durability, is more resistant to the trapping of foreign matter, and gradually opens and closes compared to a normal electromagnetic opening and closing valve, so it does not adversely affect the water flow. This is because there are advantages. And
When the closing operation of the heating thermal valve is completed, the heating control means operates the heating heating device and the heating circulation pump to circulate the heating hot water through the heating bypass passage. The heating operation can be performed even while the hot water is being supplied to the bathtub, and there is no rise in the temperature of the hot water in the bath reheating circulation flow path due to heat exchange with the heating circulation flow path. Supplied to the bathtub. Of course, the heating control means operates the heating device for heating and the circulation pump for heating after the valve closing operation of the heating valve for heating is completely completed. It is preferable from the viewpoint of avoiding
Since the interruption time of the heating operation becomes long, the heating control device may operate the heating device for heating and the circulation pump for heating before the valve closing operation of the heating valve for heating is completely completed. Even in this case, the temperature of the hot water supplied to the bathtub or the temperature of the supplied water should not be substantially affected. The timing for completely closing the valve for the heating thermal valve and the heating control means should be used for heating. The strict relationship between the timing of operating the heating device and the heating circulation pump may be appropriately determined according to various design conditions.

As the heating device for heating, for example, a gas burner or a petroleum burner can be used. Further, the heating control means can be realized by, for example, a microcomputer that controls the entire combustion device. Further, detection of completion of the valve closing operation of the heating thermal valve is performed, for example, by starting a timer at the same time when the valve closing operation of the heating thermal valve is started, and when the timer expires, the heating thermal valve is activated. It may be considered that the valve closing operation has been completed. The time required for the valve closing operation of the heating valve for heating may change a little depending on the ambient temperature, etc., but the maximum time can be known in advance by experiments, etc., so the time measured by the timer should be set accordingly. All you have to do is do it. This heating thermal valve is a portion of the heating circulation passage bypassed by the heating bypass passage, that is, a position between two confluence points of the heating bypass passage with respect to the heating circulation passage, It is installed in the circulation channel for heating.

The invention described in claim 3 of the present application is
It has a hot water supply function, a low temperature heating function, a high temperature heating function, and a bath reheating function.When the bath is reheated, heat is exchanged between the low temperature heating circulation channel and the bath reheating channel. A combustion device that raises the temperature of hot water in the reheating circulation passage, and when hot water or water is supplied to the bathtub, hot water or water is supplied through the bath hot water passage and the bath reheating circulation passage. A heating hot water tank that stores hot water for heating, which is interposed in a common portion of the low-temperature heating circulation passage and the high-temperature heating circulation passage, and during low-temperature heating operation, high-temperature heating operation, and bath reheating, A heating device for heating hot water flowing out from the hot water tank for heating and flowing through the common portion of the low temperature heating circulation channel and the high temperature heating circulation channel, the low temperature heating circulation channel and the high temperature heating circulation channel Interposed in the common part with The circulation pump for heating, which circulates the hot and cold water in the circulation channel for low-temperature heating during the heating operation and the reheating of the bath, and the circulation flow for the low-temperature heating during the high-temperature heating operation. Heat exchange device for bath reheating that exchanges heat between the channel and the circulation flow passage for bath reheating, and a bypass flow passage for low temperature heating that bypasses the heat exchange device for bath reheating for the low temperature heating circulation flow passage And a thermal valve for heating that opens and closes the part of the low-temperature heating circulation passage that is bypassed by the low-temperature heating bypass passage, and a bath reheating that circulates the hot water in the bath reheating circulation passage during reheating. When hot water or hot water is supplied to the circulating pump and the bathtub during the low temperature heating operation, first, the heating device for heating and the circulating pump for heating are stopped and the valve closing operation of the heating valve for heating is started, and the heating heat for heating is started. Valve operated When the valve operation is completed, heating control means for circulating the hot water for low temperature heating via the bypass channel for low temperature heating by operating the heating device for heating and the circulation pump for heating is provided. There is.

According to this combustion device, when hot water or hot water is supplied to the bathtub during the low-temperature heating operation, the heating control means first stops the heating device for heating and the circulation pump for heating, and the thermal valve for heating. To close the valve. That is, since the heating thermal valve is constituted by a thermal valve that is opened by the heat when the built-in heater is energized, it takes about 5 minutes to close the heating valve. The heating heating device and the heating circulation pump are stopped until the valve closing operation of the heating valve is completed, so that the bath heating circulation flow path of the bath heating heat exchange device can be changed. Avoid rising the temperature of hot and cold water. Then, when the closing operation of the heating thermal valve is completed, the heating control means actuates the heating heating device and the heating circulation pump to pass the low-temperature heating hot and cold water through the low-temperature heating bypass passage. Since it circulates, it is possible to perform low-temperature heating operation even while supplying hot water to the bathtub, and there is no rise in temperature of hot water in the bath reheating circulation channel due to heat exchange in the bath reheating heat exchange device, Hot water of appropriate temperature is supplied to the bathtub. Since the circulation channel for high temperature heating does not pass through the heat exchanger for reheating the bath, the above control is not required during the high temperature heating operation.
However, when the low temperature heating operation and the high temperature heating operation are performed at the same time, the above control is required.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a gas combustion type hot water supply apparatus as an example of the combustion apparatus according to the present invention. The gas combustion type hot water supply apparatus has hot water supply, heating, and bath reheating functions. Have This gas combustion type hot water supply device
A hot water supply can body 4 that includes a hot water supply combustor 1 and a heating combustor 2 and forms a hot water supply combustion chamber 3 of the hot water supply combustor 1.
A hot water supply burner 5 and a hot water supply heat exchanger 6 are installed in the interior of the. The hot water supply burner 5 is a hot water supply heat exchanger 6
The fuel gas such as city gas or propane gas is supplied through the hot water supply gas pipe 7 to the fuel gas. The hot water supply gas pipe 7 is provided with a hot water supply proportional valve 8 for varying the amount of fuel gas supplied to the hot water supply burner 5. A hot water supply water inlet pipe 9 and a hot water supply tap pipe 10 are connected to the hot water supply heat exchanger 6, and water such as tap water supplied to the hot water supply heat exchanger 6 through the hot water supply water inlet pipe 9. Is a heat exchanger 6 for hot water supply
Is heated by the flame of the hot water supply combustion chamber 3 while passing through
Hot water is supplied to a predetermined hot water supply location such as a kitchen or a bathtub 11 via a hot water supply tap 10. The hot-water supply pipe 9 includes a hot-water supply water amount detector 12 including a water amount sensor for detecting the amount of water input to the hot-water supply heat exchanger 6, and a temperature thermistor for detecting the temperature of water input to the hot-water supply heat exchanger 6. The hot water supply temperature detector 13 for hot water supply is installed, and the hot water supply pipe 10 is provided.
A hot-water supply hot water outlet temperature detector 14 including a temperature thermistor for detecting the hot-water hot water supply temperature from the hot-water supply heat exchanger 6 is installed therein.

At the lower end of the hot water supply can 4, a hot water supply fan 15 such as a sirocco fan for sending combustion air to the hot water supply combustion chamber 3 is installed. Is rotated by a hot water supply fan motor 16.

Inside the heating can body 22 forming the heating combustion chamber 21 of the heating combustor 2, a heating burner 23 and a heating burner 23 are provided.
A heat exchanger 24 for heating is installed. The heating burner 23 is located below the heating heat exchanger 24, and is supplied with fuel gas such as city gas or propane gas via the heating gas pipe 25. The heating burner 23 has a smaller combustion capacity than the hot water supply burner 5. Gas pipe for heating 2
5, a heating proportional valve 26 that changes the amount of fuel gas supplied to the heating burner 23 is installed. The heating heat exchanger 24 is interposed in the heating circulation flow passage 27, and the heating circulation flow passage 27 further includes the heating hot water tank 2.
8 is interposed. The heating circulation channel 27 includes a heating water inlet pipe 29 extending from the heating hot water tank 28 to the heating heat exchanger 24, and a heating hot water outlet pipe 30 extending from the heating heat exchanger 24 to the heating hot water tank 28. The heating water inlet pipe 29 is provided with a heating circulation pump 31 that circulates the hot water in the heating hot water tank 28 through the heating circulation flow path 27 and the like. Thirty
A heat exchanger 32 for reheating the bath is installed in the room.
One end of the low-temperature heating pipe 33 is connected to the heating water inlet pipe 29 at a position between the heating circulation pump 31 and the heating heat exchanger 24, and the heating hot water outlet pipe 30 is connected to the heating hot water pipe 30. One end of the high temperature heating pipe 34 is connected to a position between the exchanger 24 and the bath reheating heat exchanger 32, and the high temperature heating pipe 34 is connected between the bath reheating heat exchanger 32 and the heating hot water tank 28. One end of the heating return pipe 35 is connected to the position. The other end of the low-temperature heating pipe 33 is connected to the heating return pipe 35 via a heating device body such as a panel heater or a fan heater (not shown), and the high-temperature heating pipe 34 includes an underfloor heat radiation pipe (not shown). The other end is connected to the heating return pipe 35 via the heating device main body.

The heating heat exchanger 2 is connected to the heating water inlet pipe 29.
A water input detector 36 for heating, which is composed of a water amount sensor for detecting the amount of water input to the unit 4, is installed. Hot water outlet pipe 30
At the position between the heating heat exchanger 24 and the connection point of the high temperature heating pipe 34, a heating hot water outlet temperature detector 37 including a temperature thermistor for detecting the hot water outlet temperature from the heating heat exchanger 24 is provided. Is installed, and a heating thermal valve 38 for opening and closing the heating circulation flow path 27 is installed at a position between the bath reheating heat exchanger 32 and the connection point of the heating return pipe 35. Connection point of heating return pipe 35 and hot water tank 28 for heating
A water inlet temperature detector 39 for heating including a temperature thermistor for detecting the water inlet temperature to the heat exchanger 20 for heating is installed at a position between and.

The bath reheating heat exchanger 32 is interposed in a bath reheating circulation passage 41, and the bath reheating circulation passage 41 extends from the bathtub 11 to the bath reheating heat exchanger 32. And a bath return pipe 43 extending from the bath reheating heat exchanger 32 to the bathtub 11. The bath return pipe 42 is provided with a bath circulation pump 44 that circulates the hot and cold water of the bathtub 11 through the bath reheating circulation channel 41.
One end of a bath hot water supply pipe 46 that forms the bath hot water supply passage 45 is connected to a position between the bath heating water heat exchanger 32 and the bath heating heat exchanger 32. The other end of the bath hot water supply pipe 46 is connected to the hot water supply tap pipe 10.

At the lower end of the heating can body 22, there is installed a heating air blower fan 51 such as a sirocco fan for sending combustion air to the heating combustion chamber 21, and the heating air blower fan 51 is provided. Is rotatably driven by the heating fan motor 52. The heating gas pipe 25 has an electromagnetic opening / closing valve 5 for opening / closing a gas supply passage to the heating burner 23.
3 are installed. Further, the bath hot water supply pipe 46 is provided with an electromagnetic opening / closing valve 54 for opening / closing the bath hot water supply passage 45. Further, one end of a heating bypass pipe 55 is connected to the high temperature heating pipe 34, and the other end of the heating bypass pipe 55 is connected to the heating thermal valve 38 of the heating hot water discharge pipe 30 and the heating hot water tank. It is connected to the position between 28.
That is, the high temperature heating pipe 34 and the heating bypass pipe 55.
Thus, a heating bypass flow path 56 that bypasses the bath reheating heat exchanger 32 portion of the heating hot water outlet pipe 30 is configured.

FIG. 2 is a schematic control system diagram of the gas combustion type hot water supply apparatus. The gas combustion type hot water supply apparatus is entirely controlled by a control unit 61. This control device 61 is
A microcomputer or the like is provided, and based on signals from, for example, a remote controller 62 or various detectors installed in a bathroom or the like, various types of heating thermal valve 38, electromagnetic on-off valve 53, heating circulation pump 31, etc. Drives control equipment.

Next, the operation will be described. When the user performs, for example, a bath reheating command operation on the remote controller 62, the remote controller 62 outputs a bath reheating command signal to the control device 61. As a result, the control device 61 burns the heating burner 23, opens the heating thermal valve 38, and drives the heating circulation pump 31 and the bath circulation pump 44. As a result, the hot and cold water in the heating hot water tank 28 is heated by the heating circulation passage 2
7, and the hot and cold water in the bathtub 11 circulates in the bath-fired circulation flow channel 41. That is, the heating circulation pump 31 is used to heat the heating hot water tank 28 to the heating water pipe 29.
The hot water supplied to the heating heat exchanger 24 via the is heated by the flame of the heating combustion chamber 21 while passing through the heating heat exchanger 24, and is heated via the heating hot water tank 30 to the heating hot water tank. Return to 28. On the other hand, the hot water supplied from the bath circulation pump 44 to the bath reheating heat exchanger 32 from the bathtub 11 through the bath return pipe 42 is heated by the bath circulation pipe 44 while passing through the bath reheating heat exchanger 32. It is heated by hot water of about 80 degrees Celsius in 30 and returns to the bathtub 11 through the bath outflow pipe 43. As a result, the temperature of the hot water in the bathtub 11 gradually rises.

When the user operates the remote controller 62 or the control device 61 to instruct the high temperature heating, the control device 61 burns the heating burner 23 and installs it in the high temperature heating pipe 34. The outer valve is opened to drive the heating circulation pump 31. As a result, the hot water in the heating hot water tank 28 is heated to a high temperature by the heating inlet pipe 29, a part of the heating outlet pipe 30, the high-temperature heating pipe 34, the heating return pipe 35, and a part of the heating outlet pipe 30. It circulates through the heating circulation channel. At this time, since the heating thermal valve 38 is closed, the heating hot water tank 28 is
The hot water is the heat exchanger 3 for heating the bath of the hot water outlet pipe 30
It does not flow in two parts. That is, the circulation pump 31 for heating heats the hot water tank 28 for heating from the water inlet pipe 2 for heating.
The hot water supplied to the heating heat exchanger 24 via 9 is heated by the flame of the heating combustion chamber 21 while passing through the heating heat exchanger 24, and a part of the heating tap pipe 30 and high temperature water It returns to the heating hot water tank 28 through the heating pipe 34, the heating device main body such as the above-mentioned underfloor radiation pipe, the heating return pipe 35, and a part of the heating hot water discharge pipe 30. At this time, heat is dissipated while passing through the heating device main body such as the underfloor radiating pipe to perform underfloor heating. Eventually, hot water of about 80 degrees Celsius passes through the underfloor radiating pipe to perform underfloor heating. Of course, in addition to the above valves installed in the high temperature heating pipe 34, valves are also installed on the heating device main body side, and the room temperature can be adjusted accurately by opening and closing these valves.

When the user operates the remote controller 62 or the control device 61 to instruct the low temperature heating, the control device 61 causes the heating burner 23 to burn, and the heating thermal valve 38 and the low temperature heating. A valve (not shown) installed in the pipe 33 is opened to drive the heating circulation pump 31. As a result, the hot water in the heating hot water tank 28 circulates in the heating circulation flow path 27, and at the same time, a part of the heating water inlet pipe 29, the low temperature heating pipe 33, the heating return pipe 35, and the heating hot water outlet pipe 30. And circulates through a circulation flow path consisting of At this time, since the valve installed in the high temperature heating pipe 34 is closed, hot water in the heating hot water tank 28 does not flow through the high temperature heating pipe 34.
That is, the hot water circulating from the heating warm water tank 28 into the heating water inlet pipe 29 by the heating circulation pump 31 partially flows into the low temperature heating pipe 33, and the rest is the heating heat exchanger 2.
4 and is heated by the flame of the heating combustion chamber 21 while passing through the heating heat exchanger 24.
Return to the hot water tank 28 for heating via 0. On the other hand, the hot water flowing into the low temperature heating pipe 33 returns to the heating hot water tank 28 through the main body of the heating device such as the panel heater or the fan heater, the heating return pipe 35 and a part of the heating hot water discharge pipe 30. At this time, heat is dissipated and heat is provided while passing through the main body of the heating device such as the panel heater or the fan heater. After all, the hot water in the heating hot water tank 28 is heated by the heating circulation passage 27.
While being circulated, the heating burner 23 heats the hot water, and the hot water circulates through the heating device main body, so that heating is performed with hot water of about 60 degrees Celsius. Of course, in addition to the valves installed in the low-temperature heating pipe 33, valves are also installed on the heating device main body side, and the room temperature can be adjusted accurately by opening and closing these valves.

As described above, in the low temperature heating operation, the hot and cold water in the heating hot water tank 28 passes through the bath reheating heat exchanger 32. Therefore, when hot water is supplied to the bathtub 11 during the low temperature heating operation, for example, when the bathtub 11 is empty.
In the case of so-called automatic bath hot water supplying hot water to the bath, in the case of so-called supplemental water increasing the amount of hot water in the bathtub 11 during bathing, in the case of so-called water supply supplying water when the hot water in the bathtub 11 is too hot, etc. However, there is a problem that the hot water supplied to the bathtub 11 is heated by the heat exchange in the bath reheating heat exchanger 32 and rises above the desired temperature. It is the subject of the present invention to solve this, and this operation will be described in detail below.

First, the operation of the automatic bath hot water supply during the low temperature heating operation will be described with reference to the flow chart shown in FIG. When it is desired to add hot water to the empty bathtub 11, when the user performs a command operation of automatic bath hot water supply to the remote controller 62 during the low temperature heating operation,
Hot water such as tap water heated by the hot water supply burner 5
It is supplied to the bathtub 11 through the hot water supply tap pipe 10, the bath hot water supply pipe 46, the bath return pipe 42, and the bath outgoing pipe 43. At this time, a part of the hot water flowing from the bath hot water supply pipe 46 into the bath return pipe 42 is directly supplied to the bathtub 11 through the bath return pipe 42, and the rest is the bath reheating heat exchanger 32 of the bath return pipe 42. Hot water is supplied to the bathtub 11 through the portion and the bath outflow pipe 43. Then, the control device 61 controls the heating thermal valve 38.
The power supply to is cut off (S1), and a timer (not shown) is started (S2). This timer may be realized by hardware such as a counter that counts pulses of a predetermined cycle obtained based on a clock pulse of the CPU of the control device 61, or realized by software by executing a predetermined program. May be. Then, the control device 61 stops the combustion of the heating burner 23 (S3),
The operation of the circulation pump 31 for heating is stopped (S4).

By the way, since it takes about 5 minutes to close the heating thermal valve 38 as described above, the heating thermal valve 38 is not closed in this state, and the heating hot water tank The hot water 28 can circulate in the heating circulation flow path 27. However, since the circulation pump 31 for heating is stopped, hot water remains in the hot water outlet pipe 30 and the combustion of the heating burner 23 is also stopped. The temperature of the hot water therein does not rise, and there is no rise in the hot water supply temperature due to a portion of the hot water supplied to the bathtub 11 passing through the bath reheating heat exchanger 32.
More specifically, although some heat exchange is performed for a short time by the warm water that has accumulated in the heating hot water outlet pipe 30,
The amount of heat is small and does not substantially raise the temperature of the hot water in the bath 11.

Then, the controller 61 determines whether or not the timer has timed out (S5). This timer is set to measure a time slightly longer than, for example, 5 minutes according to the time required for closing the heating thermal valve 38, and when the timer is up, the heating heat The valve 38 is completely closed. If the timer is up (S5: YES), the controller 61 burns the heating burner 23 (S6) and activates the heating circulation pump 31 (S7). As a result, the hot water in the heating hot water tank 28 tries to circulate in the heating circulation passage 27. However, since the heating thermal valve 38 is closed, the heating circulation passage 27 cannot be circulated, and the hot water that has passed through the heating heat exchanger 24 passes through the heating bypass passage 56. Circulate. Specifically, the hot water that has passed through the heating heat exchanger 24 flows from the heating hot water discharge pipe 30 into the high temperature heating pipe 34, and further flows into the heating hot water discharge pipe 30 through the heating bypass pipe 55. , Heating hot water tank 2
Return to 8. Therefore, the heating burner 23 is burned,
Moreover, even if the heating circulation pump 31 is operated, the hot water supply temperature to the bathtub 11 does not rise due to the heat exchange in the bath reheating heat exchanger 32. Of course, from the hot water tank 28 for heating to the hot water tank 28 for heating through a part of the water inlet pipe 29 for heating, the low temperature heating pipe 33, the main body of the heating device, the heating return pipe 35, and a part of the hot water outlet pipe 30. Water is also supplied to the return circulation channel, and low-temperature heating operation is continued. After all, the low temperature heating operation is interrupted only for a period of about 5 minutes while the timer is counting.

Then, the control device 61 judges whether or not the bath automatic hot water supply to the bathtub 11 is completed (S8), and if it is completed (S8: YES), the control device 61 determines that the heating heat flow. The valve 38 is energized (S9), and this routine ends.
As a result, the heating thermal valve 38 opens in about 2 minutes, so that the hot water in the heating hot water tank 28 circulates in the heating circulation passage 27 and returns to the normal low-temperature heating operation state.

If the bath automatic hot water supply to the bathtub 11 is not completed in S8 (S8: NO), the process returns to S8 and waits until the bath automatic hot water supply to the bathtub 11 is completed. That is, the thermal valve 38 for heating is not opened until automatic bath hot water supply to the bathtub 11 is completed.

In S5, if the timer has not timed out (S5: NO), the controller 61 causes the bathtub 1
It is judged whether the automatic bath hot water supply to the bath 1 is completed (S1
0) If not completed (S10: NO), return to S5 and wait for the timer to time up. If the automatic bath hot water supply to the bathtub 11 is completed (S10: YES),
Proceed to S6. That is, if the automatic bath hot water supply to the bathtub 11 is completed, it is sufficient to return to the normal low-temperature heating operation state without waiting for the timer to time up. Therefore, the process proceeds to S6 to return to the normal low-temperature heating operation state. Proceed with processing.

Next, the operation of the hot water during the low temperature heating operation will be described with reference to the flow chart shown in FIG. When it is desired to increase the amount of hot water in the bathtub 11 while taking a bath, when the user operates the remote controller 62 to instruct addition of hot water during low temperature heating operation, tap water heated by the hot water supply burner 5 Hot water is supplied to the bathtub 11 through the hot water supply tap pipe 10, the bath hot water supply pipe 46, the bath return pipe 42, and the bath outgoing pipe 43. At this time, a part of the hot water flowing from the bath hot water supply pipe 46 into the bath return pipe 42 is directly supplied to the bathtub 11 through the bath return pipe 42, and the rest is the bath reheating heat exchanger 32 of the bath return pipe 42. Hot water is supplied to the bathtub 11 through the portion and the bath outflow pipe 43. Then, the control device 61 shuts off energization to the heating thermal valve 38 (S21) and activates a timer (not shown) (S22). This timer may be realized by hardware such as a counter that counts pulses of a predetermined cycle obtained based on a clock pulse of the CPU of the control device 61, or realized by software by executing a predetermined program. May be. Then, the control device 61 stops the combustion of the heating burner 23 (S2
3), stop the operation of the circulation pump 31 for heating (S2)
4).

By the way, since it takes about 5 minutes to close the heating thermal valve 38 as described above, the heating thermal valve 38 is not closed in this state, and the heating hot water tank The hot water 28 can circulate in the heating circulation flow path 27. However, since the circulation pump 31 for heating is stopped, hot water remains in the hot water outlet pipe 30 and the combustion of the heating burner 23 is also stopped. The temperature of the hot water inside does not rise. Therefore, there is no rise in the hot water supply temperature due to a part of the hot water supplied to the bathtub 11 passing through the bath reheating heat exchanger 32. More specifically, although some heat exchange is performed for a short time by the hot water that has accumulated in the heating hot water outlet pipe 30, the amount of heat is small and the temperature of the hot water in the bathtub 11 is substantially increased. Not a thing.

Then, the controller 61 determines whether or not the timer has timed out (S25). This timer is based on the time required to close the thermal valve 38 for heating.
For example, the time is set to be slightly longer than 5 minutes, and the heating thermal valve 38 is completely closed when this timer is up. If the timer is up (S25: YES), the control device 61 burns the heating burner 23 (S26) and activates the heating circulation pump 31 (S27). As a result, the hot water in the heating hot water tank 28 is heated by the heating circulation passage 2
Try to cycle 7. However, since the heating thermal valve 38 is closed, the heating circulation passage 27 cannot be circulated, and the hot water that has passed through the heating heat exchanger 24 passes through the heating bypass passage 56. Circulate. Specifically, the hot water that has passed through the heating heat exchanger 24 flows from the heating hot water outlet pipe 30 into the high temperature heating pipe 34, and is further heated by the heating bypass pipe 5.
It flows through 5 into the hot water outlet pipe 30, and returns to the hot water tank 28 for heating. Therefore, even if the heating burner 23 is burned and the heating circulation pump 31 is operated, the hot water supply temperature to the bathtub 11 does not rise due to the heat exchange in the bath heating heat exchanger 32. Of course, from the hot water tank 28 for heating to the hot water tank 28 for heating through a part of the water inlet pipe 29 for heating, the low temperature heating pipe 33, the main body of the heating device, the heating return pipe 35, and a part of the hot water outlet pipe 30. Water is also supplied to the return circulation channel, and low-temperature heating operation is continued. After all, the low temperature heating operation is interrupted only for a period of about 5 minutes while the timer is counting.

Then, the control device 61 judges whether or not the addition of hot water to the bathtub 11 is completed (S28), and if it is completed (S28: YES), the control device 61 causes the heating valve for heating. 38 is energized (S29), and this routine ends.
As a result, the heating thermal valve 38 opens in about 2 minutes, so that the hot water in the heating hot water tank 28 circulates in the heating circulation passage 27 and returns to the normal low-temperature heating operation state.

In S28, if the addition of water to the bathtub 11 is not completed (S28: NO), the process returns to S28 and waits until the addition of water to the bathtub 11 is completed. That is, the heating thermal valve 38 is not opened until the addition of hot water to the bathtub 11 is completed.

In S25, if the timer has not timed out (S25: NO), the controller 61 determines whether or not the addition of water to the bathtub 11 is completed (S3).
0) If not completed (S30: NO), return to S25 and wait for the timer to time up. Bathtub 11
If the addition bath to is completed (S30: YES), S2
Go to 6. That is, if the addition of hot water to the bathtub 11 is completed, it is sufficient to return to the normal low-temperature heating operation state without waiting for the timer to time up. Therefore, the process proceeds to S26 to return to the normal low-temperature heating operation state. Proceed.

Next, the water supply operation during the low temperature heating operation will be described with reference to the flow chart shown in FIG. When it is desired to lower the hot water temperature of the bathtub 11 while taking a bath, when the user issues a water supply command operation to the remote controller 62 during the low temperature heating operation, water such as tap water is supplied to the bath hot water supply pipe 46 and the bath. It is supplied to the bathtub 11 through the return pipe 42 and the bathing pipe 43. At this time,
Part of the water flowing from the bath hot water supply pipe 46 into the bath return pipe 42 is directly supplied to the bathtub 11 through the bath return pipe 42,
The remaining portion is supplied to the bathtub 11 through the bath reheating heat exchanger 32 portion of the bath return pipe 42 and the bath outflow pipe 43.
Then, the control device 61 cuts off energization to the heating thermal valve 38 (S41), and activates a timer (not shown) (S4).
2). This timer may be realized by hardware such as a counter that counts pulses of a predetermined cycle obtained based on a clock pulse of the CPU of the control device 61, or realized by software by executing a predetermined program. May be. Then, the control device 61
Stops the combustion of the heating burner 23 (S43) and stops the operation of the heating circulation pump 31 (S44).

By the way, since it takes about 5 minutes to close the heating thermal valve 38 as described above, the heating thermal valve 38 is not closed in this state, and the heating hot water tank The hot water 28 can circulate in the heating circulation flow path 27. However, since the circulation pump 31 for heating is stopped, hot water remains in the hot water outlet pipe 30 and the combustion of the heating burner 23 is also stopped. The temperature of the water inside does not rise. Therefore, there is no rise in the water supply temperature due to a portion of the water supply to the bathtub 11 passing through the bath reheating heat exchanger 32. More specifically, although some heat is exchanged for a short time by the hot water that has accumulated in the heating hot water outlet pipe 30, the amount of heat is small and substantially prevents the temperature of the hot water in the bathtub 11 from decreasing. Not a thing. In the case of water supply, the temperature of the water passing through the bath outflow pipe 43 and the hot water outlet pipe 3
The difference from the temperature of the hot water staying at 0 is larger than that in the case of automatic bath hot water supply or supplemental hot water, so the amount of heat exchanged by the heat exchanger 32 for bath reheating is somewhat large,
Still, the absolute amount is small, and bathtub 11
It does not substantially prevent the temperature drop of the hot water inside.

Then, the controller 61 determines whether or not the timer has timed out (S45). This timer is based on the time required to close the thermal valve 38 for heating.
For example, the time is set to be slightly longer than 5 minutes, and the heating thermal valve 38 is completely closed when this timer is up. If the timer is up (S45: YES), the controller 61 burns the heating burner 23 (S46) and activates the heating circulation pump 31 (S47). As a result, the hot water in the heating hot water tank 28 is heated by the heating circulation passage 2
Try to cycle 7. However, since the heating thermal valve 38 is closed, the heating circulation passage 27 cannot be circulated, and the hot water that has passed through the heating heat exchanger 24 passes through the heating bypass passage 56. Circulate. Specifically, the hot water that has passed through the heating heat exchanger 24 flows from the heating hot water outlet pipe 30 into the high temperature heating pipe 34, and is further heated by the heating bypass pipe 5.
It flows through 5 into the hot water outlet pipe 30, and returns to the hot water tank 28 for heating. Therefore, even if the heating burner 23 is burnt and the heating circulation pump 31 is operated, the temperature of the water supplied to the bathtub 11 does not rise due to the heat exchange in the bath reheating heat exchanger 32. Of course, from the hot water tank 28 for heating to the hot water tank 28 for heating through a part of the water inlet pipe 29 for heating, the low temperature heating pipe 33, the main body of the heating device, the heating return pipe 35, and a part of the hot water outlet pipe 30. Water is also supplied to the return circulation channel, and low-temperature heating operation is continued. After all, the low temperature heating operation is interrupted only for a period of about 5 minutes while the timer is counting.

Then, the control device 61 judges whether or not the water supply to the bathtub 11 is completed (S48), and if it is completed (S48: YES), the control device 61 causes the heating thermal valve 38 to operate. Is energized (S49), and this routine ends. As a result, the heating thermal valve 38 opens in about 2 minutes, so that the hot water in the heating hot water tank 28 circulates in the heating circulation passage 27 and returns to the normal low-temperature heating operation state.

In S48, if the water supply to the bathtub 11 is not completed (S48: NO), the process returns to S48 and waits until the water supply to the bathtub 11 is completed. That is, the bathtub 11
The heating thermal valve 38 is not opened until the water supply to the air is completed.

In S45, if the timer has not timed out (S45: NO), the controller 61 determines whether or not the water supply to the bathtub 11 is completed (S50),
If it has not ended (S50: NO), the process returns to S45 and waits for the timer to time out. If the water supply to the bathtub 11 is completed (S50: YES), the process proceeds to S46. That is, if the water supply to the bathtub 11 is completed, it is sufficient to return to the normal low-temperature heating operation state without waiting for the time-out of the timer, so the process proceeds to S46 to return to the normal low-temperature heating operation state. Proceed.

As described above, during hot water supply or water supply to the bathtub 11 during the low temperature heating operation, the operation of the heating burner 23 and the heating circulation pump 31 is stopped until the heating thermal valve 38 is closed. It is possible to favorably prevent the temperature of hot water supply or water injection to the bathtub 11 from rising due to heat exchange in the bath reheating heat exchanger 32.

After the heating thermal valve 38 is closed,
The hot water in the heating hot water tank 28 is circulated through the heating bypass flow path 56 until the hot water supply or the water supply to the bathtub 11 is completed, so that the low temperature heating operation is performed without increasing the hot water supply or the water supply temperature to the bathtub 11. Can continue.

In the above embodiment, an example in which two types of heating operation, high temperature heating operation and low temperature heating operation, are performed has been described, but the number of types of heating operation may be one or more, but three or more. Good. That is, the invention of the present application is applicable to all cases in which hot water for heating passes through the bath reheating heat exchanger 32 during at least one heating operation, regardless of the type of heating operation. Further, the present invention is not limited to the heating operation, and can be applied to the case where heat exchange is performed between the hot water circulation flow path used for other purposes and the bath reheating circulation flow path.

Further, in the above embodiment, the timer setting time is set to the time when the heating thermal valve 38 is completely closed. However, the timer setting time is completely closed by the heating thermal valve 38. It may be set slightly shorter than the time. By doing so, the interruption time of the low temperature heating operation can be shortened. In short, the set time of the timer may be determined so that the effect of heat exchange by the bath reheating heat exchanger 32 can be substantially avoided.

In the above embodiment, the heating valve 3 for heating is used.
Although the circulation of the hot water in the heating circulation passage 27 is stopped by closing the valve 8 in FIG. 8, the heating circulation pump 31 is simply stopped without providing the heating thermal valve 38, and the heating circulation passage 27 in the heating circulation passage 27 is stopped. The circulation of hot water may be stopped. However, functions such as heat exchange prevention are performed by the heating valve 38 for heating.
Is lower than the case where is provided. Further, in this case, it is not possible to simultaneously operate the bath side and the heating side.

[0051]

As described above, according to the first aspect of the present invention, when hot water is circulated in the hot water circulation passage, hot water is circulated in the hot water circulation passage when hot water is supplied to or supplied to the bathtub. Since the hot water circulation passage for stopping the hot water circulation passage is provided, for example, when the hot water circulation passage is used as the circulation passage for the hot water for heating, the hot water circulation is performed when hot water is supplied to or supplied to the bathtub during the heating operation. Since the passage of water through the hot water circulation passage is stopped by the passage water passage stop means, there is no rise in the temperature of the hot water in the bath reheating circulation passage due to heat exchange with the hot water circulation passage, Is supplied to the bathtub.

According to the second aspect of the present invention, when hot water or hot water is supplied to the bathtub during the heating operation, the heating device for heating and the circulation pump for heating are stopped and the thermal valve for heating is closed. When the valve operation is started and the closing valve of the heating thermal valve is completed, the heating device for heating and the circulation pump for heating are operated to circulate the hot water for heating through the bypass passage for heating. Since the heating control means is provided, the heating control means operates the heating device for heating and the circulation pump for heating to close the bypass path for heating when the closing operation of the thermal valve for heating is completed. Since the hot water for heating is circulated through the heating bath, the heating operation can be performed even while the hot water is being supplied to the bathtub, and the hot water in the bath-heating circulation flow path by heat exchange with the circulation flow path for heating. No temperature rise, suitable temperature Hot water is supplied to the bathtub.

According to the third aspect of the invention, when hot water or hot water is supplied to the bathtub during the low temperature heating operation, first, the heating device for heating and the circulation pump for heating are stopped and the thermal valve for heating is operated. When the valve closing operation is started and the valve closing operation of the heating thermal valve is completed, the heating device for heating and the circulation pump for heating are operated to allow hot water for low-temperature heating via the low-temperature heating bypass passage. Since the heating control means for circulating the heating is provided, the heating control means operates the heating device for heating and the circulation pump for heating at the time when the closing operation of the thermal valve for heating is completed, thereby performing low temperature heating. By circulating hot water for low-temperature heating through the bypass flow path, low-temperature heating operation can be performed while hot water is being supplied to the bathtub.
Moreover, there is no rise in the temperature of the hot water in the bath reheating circulation channel due to heat exchange in the bath reheating heat exchange device, and hot water having an appropriate temperature is supplied to the bathtub. Of course, since the high-temperature heating circulation passage does not pass through the bath-exchanging heat exchange device, hot water supply or water supply to the bathtub during the high-temperature heating operation is not affected by the high-temperature heating operation.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a gas combustion hot water supply apparatus as an example of a combustion apparatus according to the present invention.

FIG. 2 is a schematic control system diagram of the gas combustion hot water supply device shown in FIG.

FIG. 3 is a flowchart illustrating an automatic bath hot water supply operation during the low temperature heating operation of the gas combustion hot water supply device shown in FIG.

FIG. 4 is a flowchart for explaining an operation of adding hot water during the low temperature heating operation of the gas combustion type hot water supply apparatus shown in FIG.

5 is a flowchart illustrating a water supply operation during a low temperature heating operation of the gas combustion hot water supply device shown in FIG.

[Explanation of symbols]

11 bathtub 23 Heating burner 27 Circulation flow path for heating 31 Circulating pump for heating 34 High temperature heating piping 38 Thermal valve for heating 41 Circulation channel for bath reheating 44 Bath circulation pump 45 Bath hot water flow passage 56 Bypass flow path for heating 61 Control device

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-77336 (JP, A) JP-A-6-123433 (JP, A) Actually open 1-153415 (JP, U) Actually open 63- 137215 (JP, U) Actual Kaihei 2-128008 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24D 3/08 F24H 1/00

Claims (3)

(57) [Claims] 1. A hot water circulation flow path for circulating hot water, a bath heating circulation flow path for taking hot water from the bath and returning it to the bath, and between the hot water circulation flow path and the bath heating circulation flow path. A heat exchanger for reheating the bath by exchanging heat with a bath, and a combustor for supplying hot water or water to the bathtub through the bath reheating circulation channel, wherein the hot water circulation When hot water is supplied or water is supplied to the bathtub while hot water is circulating in the flow passage, a hot water circulation flow passage stop means for stopping circulation of the hot water in the hot water circulation passage is provided. , Combustion equipment. 2. A hot-water supply function, a heating function, and a bath reheating function, and at the time of reheating the bath, heat exchanging is performed between the circulation channel for heating and the circulation channel for reheating the bath. A combustion device that raises the temperature of hot water in a circulation channel for heating, or when supplying or supplying water to a bathtub, for supplying hot water or water through the bath hot water passage and the bath reheating circulation channel, A heating heating device that heats the hot water of the heating circulation passage, a heating circulation pump that circulates the hot water of the heating circulation passage, and a bath reheating circulation passage of the heating circulation passage. A heating bypass flow path that bypasses the heat exchange part of the, a heating thermal valve that opens and closes a part of the heating circulation flow path that is bypassed by the heating bypass flow path, and to the bathtub during the heating operation. Hot water supply or water supply Performed upon, firstly the so heating heating device and said heating circulation pump to start the closing operation of the heating Netsudoben with stops, the time in which the valve closing operation of the heating Netsudoben is completed,
A combustion apparatus, comprising: heating control means for circulating hot water for heating through the bypass passage for heating by operating the heating device for heating and the circulation pump for heating. 3. A hot water supply function, a low temperature heating function, a high temperature heating function, and a bath reheating function, and at the time of reheating the bath, heat is exchanged between the low temperature heating circulation channel and the bath reheating channel. To raise the temperature of the hot water in the bath reheating circulation channel, and when hot water or water is supplied to the bathtub, hot water or water is supplied through the bath hot water recirculation channel and the bath reheating circulation channel. A combustion device, a heating hot water tank for storing hot water for heating, which is interposed in a common portion of the low-temperature heating circulation passage and the high-temperature heating circulation passage, and a low-temperature heating operation and a high-temperature heating operation A heating device for heating hot water flowing out of the heating hot water tank and flowing in a common portion of the low-temperature heating circulation passage and the high-temperature heating circulation passage at the time of heating and reheating the bath; Circulation channel And the circulation channel for high-temperature heating are provided in common to circulate the hot and cold water in the circulation channel for low-temperature heating during heating operation and bath reheating, and the circulation flow for high-temperature heating during high-temperature heating operation. A circulation pump for heating that circulates hot and cold water in the passage, a heat exchange device for bath reheating for exchanging heat between the circulation passage for low temperature heating and the circulation passage for bath heating, and the circulation for low temperature heating A low-temperature heating bypass passage that bypasses the bath-exchanging heat exchange device portion of the passage, and a heating heat that opens and closes a portion of the low-temperature heating circulation passage that is bypassed by the low-temperature heating bypass passage. A valve, a bath reheating circulation pump that circulates the hot water in the bath reheating circulation channel when reheating, and a hot water heating or heating water supply to the bathtub during low temperature heating operation. And the circulation pump for heating are stopped and the valve closing operation of the thermal valve for heating is started, and when the valve closing operation of the thermal valve for heating is completed, the heating device for heating and the heating And a heating control means for circulating hot water for low-temperature heating through the bypass channel for low-temperature heating by operating a circulation pump for heating.