JP2003065609A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device enabling control of a feed amount of city water fed to a drain drainage means from a city water feed means through simple constitution and simple control. SOLUTION: The combustion device comprises: a combustion burner 12 to produce combustion exhaust gas; a heat exchanger 36 to recover the sensible heat and the latent heat of combustion exhaust gas; drainage sump means 48 to collect and discharge drainage sump generated through heat exchange of the heat exchanger 36; a service water feeding means 54 to feed service water to the drainage sump means 48; and a control means 70 to control a feed amount of service water from the service water feed means 54. The control means 70 controls a feed amount of service water fed from the service water feed means 54 based on the opening and closing state of a main gas opening and closing valve 30 to control supply of gas for fuel to a combustion burner 12 and gas switching valves 32 and 34.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a combustion apparatus having a heat exchanger capable of recovering latent heat.

[0002]

2. Description of the Related Art A hot water supply combustion apparatus for supplying hot water is equipped with a heat exchanger for exchanging heat with combustion exhaust gas generated by a combustion burner, and tap water is supplied to an inflow side of the heat exchanger. The flow path is connected, and the hot water discharge flow path is connected to the discharge side. In this heat exchanger, tap water is sent to the heat exchanger through the tap water supply passage, and hot water that has been warmed by heat exchange with the combustion exhaust gas in the heat exchanger is passed downstream through the tap water flow passage. Sent to.

In this type of hot water supply combustion apparatus, in order to improve the thermal efficiency, one having a heat exchanger capable of recovering the exhaust sensible heat and the exhaust latent heat of the combustion exhaust gas has been put into practical use. A heat exchanger capable of recovering latent heat usually includes a main heat exchanger section and a sub heat exchanger section, and in the main heat exchanger section, sensible heat in combustion exhaust gas is recovered, and the sub heat exchanger In this section, not only the sensible heat in the combustion exhaust gas but also the latent heat contained in the steam in the combustion exhaust gas is recovered.

In this latent heat recovery type combustion device, the latent heat of the steam in the combustion exhaust gas is removed during heat exchange in the sub heat exchanger section, so that the steam is condensed in the sub heat exchanger section. Condensate. And the generated dew condensation water (condensed water)
Is collected by the drain drainage means and discharged to the outside as drain water.

The drain water absorbs nitrogen oxides and sulfur oxides in the combustion exhaust gas and becomes acidic water having a pH of about 3 to 4. Therefore, if drained as it is, corrosion of the metal portion of the drainage pipe occurs. Therefore, it is necessary to neutralize the pH value of the generated drain water within the range of 5 to 9 of the drainage standard because it leads to deterioration of concrete and the like.

For this reason, conventionally, a neutralizer filled with a solid alkaline neutralizing agent is provided in the drain drainage channel for draining drain water, and the neutralizer removes drain water. It drained after it was softened. However, in the method using this neutralizer, there is a problem that after long-term use, clogging occurs and the drainage water drainage capacity is reduced, and the filled neutralizing agent is consumed and the neutralization performance is reduced. there were.

Therefore, in order to eliminate such an inconvenience, it has been proposed to use tap water as a neutralizing agent (for example, see Japanese Utility Model Laid-Open No. 57-28239). In this combustion device, a tap water feed passage for feeding tap water to the heat exchanger and a drain drain passage are connected via a tap water supply passage, and a tap water control valve is provided in the tap water supply passage. Is provided. When the water flow control valve is opened,
A part of the tap water flowing through the tap water supply channel is supplied to the drain drain channel through the tap water supply channel and mixed into the drain water, and the supply amount of tap water flowing through the tap water supply channel depending on its opening degree. Is adjusted, whereby the alkaline component contained in the tap water reacts with the acidic component of the drain water, and the drain water is diluted and neutralized with the tap water.

[0008]

Recently, the amount of drain water generated is calculated from the combustion heat of the combustion burner, and the tap water to be supplied by the tap water supply means is calculated from the calculated amount of drain water. There is one that determines the amount, in other words, the opening degree of the flow control valve, but the configuration of the control circuit becomes complicated, and the control for controlling the opening degree of the flow control valve, that is, the supply amount of tap water. However, there is a problem that the manufacturing cost becomes high due to this.

An object of the present invention is to provide a combustor capable of controlling the amount of tap water supplied from the tap water supply means to the drain drain means with a simple structure and control.

[0010]

The present invention relates to a combustion burner which produces combustion exhaust gas and a heat exchanger which exchanges heat with the combustion exhaust gas to recover sensible heat and latent heat. Drainage means for collecting and discharging drainage water generated by heat exchange of the vessel, tap water supply means for supplying tap water to the drainage drain means, and supply of tap water from the tap water supply means A control means for controlling the amount, and neutralizes the drain water flowing through the drain discharge passage by supplying tap water from the tap water supply means to the drain discharge passage of the drain drain means. In the above combustion apparatus, the combustion burner is composed of a plurality of burner parts, and a downstream side part of the gas supply flow path for supplying the fuel gas to the combustion burner is a main supply flow path part and a branch supply flow. Branched into the road, The supply flow path section and the branch supply flow path section are respectively connected to the corresponding burner section, and the gas supply flow path is connected to the main supply flow path section and the branch supply flow path section upstream from the main supply flow path section. A gas opening / closing valve is arranged, and a gas switching valve is arranged in the branch flow passage portion, and the control means is configured to perform the operation based on an open / closed state of the original gas opening / closing valve and the gas switching valve. The combustion device is characterized by controlling the amount of tap water supplied from the tap water supply means.

According to the present invention, a heat exchanger for recovering the sensible heat and latent heat of the combustion exhaust gas is used as the heat exchanger, and the drain water generated in this heat exchanger is the drain drain passage of the drain drain means. The tap water from the tap water supply means is supplied to the drain drain passage, and the drain water is diluted and neutralized by the tap water from the tap water supply means. The combustion burner is composed of a plurality of burner parts, and a source gas opening / closing valve is provided in a gas supply flow path (a part upstream of the main supply flow path part and the branch supply flow path part) for supplying a fuel gas to the combustion burner. A gas switching valve is provided in the branch supply flow path portion on the downstream side of the gas supply flow path, and the control means controls the tap water supply means based on the open / closed state of the original gas opening / closing valve and the gas switching valve. Control the supply of tap water. Since the supply amount of tap water is controlled based on the open / closed states of the original gas opening / closing valve and the gas switching valve in this way, the supply amount of tap water can be controlled as required with a simple configuration and simple control. You can
Useless use of tap water can be suppressed.

For example, when the source gas on-off valve is in the open state and the gas switching valve is in the closed state, the combustion burner is in the small combustion state, and the control means supplies the tap water so that the amount of tap water supplied is reduced. When the source gas on-off valve and the gas switching valve are open, the combustion burner is in a large combustion state, and the control means controls the tap water supply means so that the supply amount of tap water increases. It should be noted that two or more branch supply flow passage portions of the gas supply flow passage may be provided, and in such a case, a gas switching valve is arranged in each branch supply flow passage portion.

Further, in the present invention, the tap water supply means supplies tap water to the drain drainage flow path of the drain drainage means, a part of which is branched into a main flow path part and a branch flow path part. A water supply passage, a water opening / closing valve for supplying and stopping the supply of tap water through the main passage, and a switching opening / closing valve for supplying and stopping the supply of tap water through the branch passage. The control means controls opening / closing of the water opening / closing valve and the switching opening / closing valve in accordance with opening / closing states of the original gas opening / closing valve and the gas switching valve.

According to the present invention, the tap water supply means has a tap water supply passage having a main passage portion and a branch passage portion, a water opening / closing valve, and a water switching opening / closing valve. When it is in the open state, tap water is supplied to the drain drainage means through the main flow path portion, and when the switching on-off valve is in the open state, tap water is also supplied from the branch flow path portion to the drain drainage means. The control means controls opening / closing of the water opening / closing valve and the switching opening / closing valve based on the opening / closing states of the original gas opening / closing valve and the gas switching valve. For example, when the original gas opening / closing valve is open and the gas switching valve is closed. Corresponding to this state, only the water on-off valve is opened, whereby a relatively small amount of tap water is supplied through the main flow path portion, and, for example, when the original gas on-off valve and the gas switching valve are in the open state, Corresponding to this state, the water opening / closing valve and the switching opening / closing valve are opened, whereby a relatively large amount of tap water is supplied through the main flow path section and the branch flow path section. The water supply can be controlled as desired. When two or more branch supply flow passage parts of the gas supply flow passage are provided, a branch flow passage part is provided corresponding to each branch supply flow passage in the tap water supply flow passage, and these branch flow passage parts are provided. A switching on-off valve can be installed,
In order to simplify the supply control of tap water, the switching on-off valve of one branch flow passage part may be opened and closed based on the opening and closing of the gas switching valve of two or more branch supply flow passage parts.

Further, in the present invention, a plurality of branch supply flow passage portions are provided on the downstream side of the gas supply flow passage, and the gas switching valves are arranged in the plurality of branch supply flow passage portions, respectively. In addition, a plurality of branch flow passage portions corresponding to the number of the branch supply flow passage portions of the gas supply flow passage are provided in the part of the tap water supply flow passage, and the plurality of branch flow passage portions are provided. The switching means is provided in each of them, and the control means corresponds to the open / closed state of the gas switching valves of the plurality of branch supply flow path portions of the gas supply flow path, and the tap water supply flow path. The switching on-off valves of the plurality of branch flow passage parts are controlled to be opened and closed.

According to the present invention, the gas supply passage has a plurality of branch supply passage portions, and the gas switching valve is arranged in each of the branch supply passage portions. Corresponding to such a configuration of the gas supply flow path, the tap water supply flow path is provided with a plurality of branch flow path parts corresponding to the number of branch supply flow path parts and is switched to each branch flow path part. An on-off valve is provided. Then, the control means controls opening / closing of the switching on / off valve of the branch flow passage part of the tap water supply flow passage in correspondence with the open / close state of the gas switching valve of the plurality of branch supply flow passage parts of the gas supply flow passage, for example, If the gas switching valve of a specific branch supply flow path is open, tap water is supplied by opening the switching opening / closing valve of the branch flow path of the tap water supply means corresponding to this, so simple control is possible. Therefore, the supply amount of tap water can be controlled as required.

Further, according to the present invention, a heating combustion device section for supplying hot water to the heating device and a hot water supply combustion device section for supplying hot water are provided. The combustion device parts for use respectively include a combustion burner for generating combustion exhaust gas, a heat exchanger for exchanging heat with the combustion exhaust gas to recover sensible heat and latent heat, and heat exchange for the heat exchanger. The drain drain means for collecting and discharging the generated drain water is provided, and the drain drain means of the heating device combustion device section and the drain drain means of the water heater combustion device section merge drain water. Combustion, which is connected to discharge tap water and further includes tap water supply means for supplying tap water used for diluting and neutralizing drain water, and control means for controlling the tap water supply means. A device, A heating gas supply passage for supplying a fuel gas is connected to the combustion burner of the heating combustion device section, and a heating source gas on-off valve is arranged in the heating gas supply passage, A hot water supply gas supply passage for supplying a fuel gas is connected to the combustion burner of the hot water supply combustion device section, and a hot water supply source gas on-off valve is arranged in the hot water supply gas supply passage. The control unit controls the supply amount of tap water supplied from the tap water supply unit based on the open / closed states of the heating source gas switching valve and the hot water supply source gas switching valve. Is.

According to the present invention, the combustion apparatus is composed of a heating combustion apparatus section and a hot water supply combustion apparatus section, drain drainage means of these combustion apparatus sections are mutually connected, and tap water from tap water supply means is supplied. It is configured to be supplied to the drain drainage means. A heating source gas on-off valve is provided in the heating gas supply passage that supplies the fuel gas to the combustion burner of the heating combustion unit, and supplies the fuel gas to the combustion burner of the hot water supply combustion unit. A hot water source gas on-off valve is arranged in the gas supply flow path, and the control means controls the amount of tap water supplied from the tap water supply means based on the open / closed states of the heating source gas on-off valve and the hot water source gas on-off valve. To control. In this way, since the supply amount of tap water is controlled based on the operation and non-operation of the heating combustion device unit and the hot water supply combustion device unit, the supply amount of tap water can be set as required with a simple configuration and simple control. Can be controlled, and wasteful use of tap water can be suppressed.

For example, when the hot-water supply source gas on-off valve is in the open state (when the hot-water supply combustion device is in the operating state), dew condensation is likely to occur in the heat exchanger, and the drainage amount of drain water increases. Therefore, the control means controls the tap water supply means so as to increase the supply amount of tap water, and when the heating source gas on-off valve is in the open state (when the heating combustion device section is in the operating state). The condensation generated in the heat exchanger is small, and the drainage amount of drain water is also reduced. Therefore, the control means controls the tap water supply means so that the supply amount of tap water is reduced.

Further, in the present invention, the tap water supply means includes first and second tap water supply passages for supplying tap water.
A first and a second water opening / closing valve arranged in the first and second tap water supply passages, and the control means opens / closes the heating source gas opening / closing valve and the hot water supply source gas opening / closing valve. The first and second water on-off valves are controlled to be opened and closed according to the state.

According to the present invention, the tap water supply means has first and second tap water supply passages, and first and second water opening / closing valves are arranged in the first and second tap water supply passages. ing. The control means controls the opening and closing of the first and second water opening / closing valves in accordance with the open / close state of the heating source gas opening / closing valve and the hot water supply source gas opening / closing valve, for example, the heating source gas opening / closing valve (or the hot water supply source). When the gas on-off valve is open, the first water on-off valve (or the second water on-off valve)
The water opening / closing valve) is opened, and the first and second water opening / closing valves are opened when the heating original gas opening / closing valve and the hot water supply source gas opening / closing valve are opened. The tap water required for neutralization can be supplied with simple control.

Furthermore, in the present invention, the tap water supply means stops the supply of tap water after a predetermined time has elapsed after the combustion of the combustion burner is completed. According to the present invention, the supply of tap water from the tap water supply means is stopped after a lapse of a predetermined time after the end of combustion of the combustion burner. The drain water is drained through the drain drain passage until some time passes after the combustion of the combustion burner is completed. Therefore, by controlling in this way, the drain water can be neutralized as required. The predetermined time is set to about 1 to 3 minutes.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a combustion apparatus according to the present invention will be described below with reference to the accompanying drawings. First Embodiment First, with reference to FIGS. 1 to 4, a first embodiment of a combustion apparatus according to the present invention will be described. FIG. 1 is a simplified diagram showing a combustion device according to a first embodiment in a simplified manner, and FIG.
FIG. 3 is a diagram showing the relationship between the open / closed states of the first and second gas switching valves and the supply amount of fuel gas in the combustion apparatus of FIG. 1, and FIG. 3 is the first and second gas switching in the combustion apparatus of FIG. 1. It is a figure which shows the relationship between the opening / closing state of a valve, the water opening / closing valve, and the opening / closing state of a 1st and 2nd switching opening / closing valve, and FIG. 4 is a flowchart which shows a part of control of the combustion device of FIG.

In FIG. 1, the illustrated hot water supply combustion device 2 includes a device housing 4, and a combustion chamber 6 is defined in the combustion housing 4. Above the combustion chamber 6 is shown in FIG.
An exhaust passage 8 extending laterally is formed, and an exhaust port 10 is provided at the downstream end of the exhaust passage 8. Combustion chamber 6
A combustion burner 12 is provided in the lower part of the combustion burner 12 in the illustrated embodiment.
It is composed of 6,18. A blower fan 20 is provided at the lower end of the combustion chamber 6, and the blower fan 20 sends combustion air to the combustion chamber 6.

Fuel gas (for example, city gas, LP gas) is supplied to the combustion burner 12 through a gas supply passage 22. The downstream side of the gas supply flow path 22 includes a main supply flow path part 24 and first and second branched gas supply flow path parts 26, 28.
And the main gas supply flow path section 24 is connected to the first burner section 14
And the first branch supply flow path section 26 is connected to the second burner section 1
6, and the second branch supply flow passage portion 28 is connected to the third burner portion 18. A main supply flow passage portion 24 and first and second branch supply flow passage portions 26 in the gas supply flow passage 22;
A source gas on-off valve 30 and a proportional valve 31 are sequentially provided on the upstream side of 28 from the upstream side, and the first branch supply flow path section 26
Is provided with a first gas switching valve 32, and the second branch supply flow path unit 28 is provided with a second gas switching valve 34. The original gas on-off valve 30 opens and closes the gas supply passage 22 to supply and stop the supply of the fuel gas, and the proportional valve 31 opens the gas supply passage 2
2 controls the supply amount of the fuel gas, and the first gas switching valve 32 opens and closes the first branch supply flow passage portion 26 to supply and stop the supply of the fuel gas to the second burner portion 16. The second gas switching valve 34 opens and closes the second branch supply flow passage portion 28 to supply and stop the supply of the fuel gas to the third burner portion 18.

Since it is constructed in this way, FIG.
As shown in (a) and (b), the combustion state of the combustion burner 12 is controlled in four stages, that is, in the A to D regions. In the region A where only the source gas on-off valve 30 is open, the fuel gas is fed to the first burner section 14 through the main supply flow path section 24, and the combustion burner 12 burns only in the first burner section 14. A small combustion state occurs. In the region B where the source gas on-off valve 30 and the first gas switching valve 32 are in the open state, the fuel gas passes through the main supply flow passage part 12 and the first branch supply flow passage part 26, and the first and second burner parts 14, 16 and the combustion burner 12 is in a small combustion state during combustion in the first and second burner portions 14 and 16. In the C region where the source gas on-off valve 30 and the second gas switching valve 34 are in the open state, the fuel gas passes through the main supply flow passage portion 12 and the second branch supply flow passage portion 28, and the first and third burner portions 14, The combustion burner 12 is fed into the first and third burner portions 14 and 18, and is in a large combustion state. Further, in the region D in which the source gas on-off valve 30 and the first and second gas switching valves 32 and 34 are in the open state, the fuel gas is supplied with the main gas supply passage 24 and the first and second branch supply passages 26. , 28 are fed to the first to third burner parts 14, 16 and 18, and the combustion burner 12 is
The first to third burner parts 14, 16 and 18 are in a large combustion state in which they burn. The combustion exhaust gas generated by the combustion of the combustion burner 12 flows through the combustion chamber 6 and the exhaust passage 8 and is exhausted to the outside from the exhaust port 10.

A heat exchanger 36 for recovering sensible heat and latent heat in the combustion exhaust gas is arranged in the exhaust passage 8 on the downstream side of the combustion chamber 6. The heat exchanger 36 includes a main heat exchanger portion 38 and a sub heat exchanger portion 40. The main heat exchanger portion 38 is disposed on the upstream side and the sub heat exchanger portion is disposed on the downstream side when viewed in the flow direction of the combustion exhaust gas. A heat exchanger section 40 is arranged.

The combustion device 2 is used as a device for supplying hot water to a currant (not shown) provided in a sink, a washbasin, etc. of a kitchen, and a tap water supply source (not shown) such as a tap water buried pipe. The tap water supply flow path 42 for supplying tap water from the sub) is connected to the sub heat exchanger section 40 of the heat exchanger 36,
The hot water flow passage 44 connected to the currant is the main heat exchanger part 3
8 and the tap water supply passage 42 has tap water opening / closing valve 4
6 are provided.

With this structure, when the calan (not shown) is opened, the tap water opening / closing valve 46 of the tap water feed passage 42 is opened and the tap water feed passage 42 is opened. First, the tap water is sent to the sub heat exchanger section 40 of the heat exchanger 32, where it is heat-exchanged with the combustion exhaust gas, and the sensible heat in the combustion exhaust gas is exchanged. And the recovery of latent heat. The hot water that has undergone heat exchange in this sub heat exchanger section 40 is then fed to the main heat exchanger section 38, and heat exchanged with the combustion exhaust gas in this main heat exchanger section 38, Sensible heat in the combustion exhaust gas is recovered. The hot water thus heated by the heat exchanger 36 is fed to the calan (not shown) through the hot water flow passage 44, and the hot water is discharged from the opened calan.

In the above-described combustion device 2, the sub-heat exchanger section 40 of the heat exchanger 36 also recovers latent heat in the combustion exhaust gas, so that dew condensation occurs in the sub-heat exchanger section 40. In connection with this, the drain draining means 48 is provided so that the water condensed in the sub heat exchanger section 40 is drained to the outside as drain water. The drain draining means 48 shown in the figure extends from the drain receiving portion 50 provided at a predetermined portion of the device housing 4 (specifically, a portion located below the auxiliary heat exchanger portion 40). The drain drainage channel 52 is included, and the water condensed in the sub heat exchanger 40 is dripped and collected in the drain receiving section 50, and is drained to the outside from the drain receiving section 50 through the drain drainage channel 52.

A mixing tank 53 is provided in the drain drainage channel 52, and a tap water supply means 54 for supplying tap water used for diluting and neutralizing the drain water is connected to the mixing tank 53. . The tap water supply means 54 includes a tap water supply passage 56 for supplying tap water.
One end side of 6 is connected to the tap water supply flow channel 42 (specifically, a portion upstream of the tap water opening / closing valve 46), and the other end side is connected to the mixing tank 53 of the drain drainage flow channel 52.

In this embodiment, the downstream side portion of the tap water supply passage 56 is the main passage portion 58 and the first and second branch passage portions 6
0 and 62, and branch flow passage portions 60 and 62 of the tap water supply flow passage 56 are provided in correspondence with the number of branches of the branch supply flow passage portions 26 and 28 of the gas supply flow passage 20, and these main flow passage portions are provided. 58
Also, the first and second branch flow passage portions 60, 62 are the mixing tank 53.
It is connected to the. Tap water supply flow path 56 (specifically,
A water opening / closing valve 6 is provided on the upstream side of the branch flow passages 60 and 62.
4 are provided, and the first and second branch flow passage portions 60, 62 are provided with first and second switching on-off valves 66, 68.

With this construction, when the water opening / closing valve 64 is opened, tap water from the tap water supply passage 42 is passed through the main passage portion 58 of the tap water supply passage 56 to the mixing tank 53. Supplied in small quantities. When the water opening / closing valve 64 and the first switching opening / closing valve 66 (or the second switching opening / closing valve 68) are opened,
A medium amount of tap water is supplied to the mixing tank 53 through the main channel portion 58 and the first branch channel portion 60 (or the second branch channel portion 62) of the tap water supply channel 56. In this embodiment, the second branch flow passage portion 62 is more than the supply amount flowing through the first branch flow passage portion 60.
The supply amount of water flowing therethrough is set to be larger. Therefore, the supply amount of tap water is larger when the water opening / closing valve 64 and the second switching opening / closing valve 66 are in the open state. Further, when the water on-off valve 64 and the first and second switching on-off valves 66, 68 are in the open state, the tap water is supplied through the main channel portion 58 and the first and second branch channel portions 60, 62 of the tap water supply channel 56. A large amount of water is supplied to the mixing tank 53.

In this embodiment, the tap water supply channel 5
Although the downstream side portion of 6 is branched and then connected to the drain drainage flow channel 52, instead of such a configuration, after branching at an intermediate portion thereof, these are merged, and the tap water supply flow channel after the merge May be connected to the mixing tank 53 of the drain drainage flow channel 52, a portion upstream of the mixing tank 53, or the drain receiving portion 50. In addition, in this embodiment, a water opening / closing valve 64 is provided in the middle of the tap water supply flow path 56, and
The first and second switching opening / closing valves 66, 68 are provided in the second and second branch flow passage portions 60, 62. Instead of such a configuration, water opening / closing is performed in the main flow passage portion 58 of the tap water supply flow passage 56. Valve 64
May be provided, and the first and second branch opening / closing valves 66, 68 may be provided in the first and second branch flow passage portions 60, 62,
Even with this configuration, tap water can be supplied as described above.

In this embodiment, tap water supply means 54
(Water on-off valve 64 and first and second switching on-off valves 66, 6
8) is controlled by the control means 70, and this control means 7
0 includes operation control means 72 and timer 74. The operation control means 72 controls the water on-off valve 64 and the first and second switching on-off valves 66 and 68 to the combustion state of the combustion burner 12, that is, the original gas on-off valve 30 and the first and second gas switching valves 32 and 32.
The water opening / closing valve 64 and the first and second switching opening / closing valves 66, 68 are opened / closed in accordance with the opened / closed state of the valve 34. In this form, the water on-off valve 64 corresponds to the original gas on-off valve 30, the first gas switching valve 32 corresponds to the first switching on-off valve 66, and the second
The gas switching valve 34 corresponds to the second switching on-off valve 68,
The operation control means 72 opens the switching on-off valve 64 on the basis of a signal of the open state from the original gas on-off valve 30 when the original gas on-off valve 30 is open, and when the first gas switching valve 32 is on the open state. The first switching valve 66 is opened based on the open signal from the first gas switching valve 32, and when the second gas switching valve 34 is open, the open signal from the second gas switching valve 34 is opened. Based on the above, the second switching on-off valve 68 is opened. Therefore, as shown in FIG. 3, the operation control means 72 opens the water on-off valve 64 in the region A in which the original gas on-off valve 30 is in the open state to open the original gas on-off valve 30 and the first gas switching valve. The water on-off valve 64 and the first switching on-off valve 66 are opened in the region B in which 32 is in the open state, and the water on-off valve in the region C in which the original gas on-off valve 30 and the second gas on-off valve 34 are in the open state. 64 and second switching on-off valve 68
Is opened, and in the area D where the original gas on-off valve 30 and the first and second gas switching valves 66, 68 are open, the water on-off valve 64 and the first and second switching on-off valves 66, 6
8 is opened. Further, the timer 74 measures the set time.

Next, with reference to FIG. 4 together with FIG. 1, the neutralization process of the drain water in the above-mentioned combustion device 2 will be described. When the combustion device 2 is not operating, the source gas on-off valve 30 is maintained closed (OFF). At this time, the combustion heat in the combustion burner 12 and the auxiliary heat exchanger section 40 of the heat exchanger 36
No dew condensation occurs and the water on-off valve 64 is kept closed (step S-2). Therefore, the tap water supply means 54 is kept in the non-operating state, and the tap water is not supplied to the drain drain passage 52 through the tap water supply passage 54.

When the combustion device 2 is operated from such a state, the process proceeds from step S-1 to step S-3, and the source gas switching valve 30 is in the open (ON) state,
Based on the signal from the original gas switching valve 30, the control means 7
0 opens the water on-off valve 64. Next, step S-
4, it is determined whether or not the first gas switching valve 32 is in the open state, and if the first gas switching valve 32 is in the closed state, the first
The switching on-off valve 66 is also kept closed (step S-
5), when the first gas switching valve 32 is in the open state,
Based on the signal from the gas switching valve 32, the control means 70 opens the first switching on-off valve 66 (step S-6).
Next, in step S-7, it is determined whether the second gas switching valve 34 is in the open state. If the second gas switching valve 34 is in the closed state, the second switching on-off valve 68 is also in the closed state. However, when the second gas switching valve 34 is open, the control means 70 opens the second switching on-off valve 68 based on the signal from the second gas switching valve 34. (Step S-9). In this way, the control means 70 controls the combustion state of the combustion burner 12, in other words, the source gas on-off valve 30.
In addition, the water opening / closing valve 64 and the first and second switching opening / closing valves 66, 68 are controlled to open / close in accordance with the open / closed states of the first and second gas switching valves 32, 34 as shown in FIG. A suitable amount of tap water for neutralizing the drain water generated in the auxiliary heat exchanger section 40 of the vessel 36 is supplied from the tap water supply means 54 to the mixing tank 53. In the mixing tank 53, the drain water from the drain drainage channel 52 and the tap water from the tap water supply means 54 are mixed, and the drain water is diluted and neutralized with the tap water.

Next, in step S-10, it is determined whether or not the original gas on-off valve 30 is open, and the combustion device 2
When the original gas on-off valve 10 is held in the open state, the operation returns to step S-3 and step S-3.
-3 to step S-10 are repeatedly performed. On the other hand, the operation of the combustion device 2 is completed, and the original gas on-off valve 1
When 0 is closed, the timer 74 operates (step S
-11), this timer 74 has a predetermined time (for example, 1 to 3).
It is kept in that state until the time is set. When the timer 74 times out (step S-12), the process proceeds to step S-13, and the water opening / closing valve 64
Is closed, the first and second switching on-off valves 66, 68 are closed (step S-14), and the tap water supply means 5 is closed.
The supply of tap water by 4 is completed. In this way, since the tap water is continuously supplied for a predetermined time (the period when the timer 74 is up) after the combustion of the combustion burner 12, the tap water is supplied by the tap water supply means 54 until the drain water is completely discharged. The generated drain water can be surely diluted and neutralized.

In this embodiment, the combustion burner 12 is composed of three burner sections 14, 16 and 18, but the combustion burner 12 may be composed of two or four or more burner sections. For example, when the combustion burner 12 is composed of two burner parts, one burner part is connected to the main supply flow path part of the gas supply flow path, and the other burner part is connected to the branch supply flow path part. The original gas on-off valve and the gas switching valve are arranged in the gas supply flow path as described above. Corresponding to such a configuration, a part of the tap water supply passage of the tap water supply means is branched into a main passage portion and a branch passage portion, and the tap water supply passage is opened and closed as described above. A valve and a switching on-off valve are provided. The water opening / closing valve is controlled to open / close according to the opening / closing state of the original gas opening / closing valve, and the switching opening / closing valve is controlled to open / close according to the opening / closing state of the gas switching valve. The effect of is achieved.

Further, in the above-described embodiment, the water on-off valve 64 and the corresponding water on-off valve 64 are provided based on the signals of the open states of the original gas on-off valve 30 and the first and second gas switching valves 32 and 34, respectively. Although the first and second switching on-off valves 66 and 68 are in the open state, instead of such a configuration, for example,
You may make it comprised as follows. The control means is composed of a control microcomputer, and the operation pattern (combustion state of the combustion burner 12 and the water on-off valve 64 and the first and second switching on-off valves 66, 6) shown in FIG.
8) the operation pattern indicating the relationship with the open / closed state of 8),
Original gas on-off valve 30 and first and second gas switching valves 32,
Based on the open state signal of 34, operation patterns corresponding to those open / close states are read out, and the water on-off valve 64 and the first and second switching on-off valves 66 and 68 are opened / closed based on the read out operation pattern. You may

In the above-described embodiment, the first and second switching on-off valves 66 and 68 are provided so as to correspond to the first and second gas switching valves 32 and 34, respectively. Instead of, for example, the first and second gas switching valves 32,
A switching on-off valve may be provided so as to correspond to 34. In this case, a part of the tap water supply flow path is branched into a main flow path part and a branch flow path part, and such a tap water supply flow path is provided with a water opening / closing valve and a switching opening / closing valve in the same manner as described above. When one or both of the first and second gas switching valves 66 and 68 are open, the switching opening / closing valve can be opened to supply tap water through the branch flow passage. .

Second Embodiment Next, a combustion apparatus according to a second embodiment will be described with reference to FIGS. FIG. 5 is a simplified diagram schematically showing the combustion apparatus of the second embodiment, and FIG. 6 is a flowchart showing a part of control of the combustion apparatus of FIG. In the following embodiments, substantially the same members as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 5, the combustion apparatus 2A of the second embodiment has a hot water supply combustion apparatus section 102 for generating hot water for hot water supply and a heating combustion apparatus section for generating hot water for use in a hot water heating apparatus. And 104. The configuration of the hot water supply combustion device section 102 is substantially the same as that of the combustion device 2 of the first embodiment, and therefore, the detailed configuration of the hot water supply combustion device section 102 is omitted.

The heating combustor unit 104 has the same basic structure as the hot water supply combustor unit 102, and a combustion burner 106 is composed of first and second burner units 108 and 110. A blower fan 114 is provided at the lower end of the combustion chamber 112. A heating gas supply passage 116 is connected to the combustion burner 106, and the gas supply passage 1
The downstream side of 16 is branched into a main gas supply flow path section 118 and a branch gas supply flow path section 120, and the main gas supply flow path section 120 is divided.
Is connected to the first burner section 108, and the branch gas supply flow path section 120 is connected to the second burner section 110. On the upstream side of the main gas supply flow passage 118 and the branch gas supply flow passage 120 in the heating gas supply flow passage 116, the heating source gas on-off valve 122 and the heating proportional valve 124 are arranged from the upstream side.
Are sequentially provided, and the branch gas supply flow path portion 120 is provided with a heating gas switching valve 126.

A heating heat exchanger 130 capable of recovering latent heat is disposed in the exhaust passage 128 on the downstream side of the combustion chamber 112.
The heating heat exchanger 130 includes a hot water supply combustion device unit 102.
Similar to the heat exchanger 36 of FIG. 1, the main heat exchanger section 132 that recovers sensible heat and the sub heat exchanger section 1 that recovers sensible heat and latent heat.
34, and when viewed in the flow direction of the combustion exhaust gas,
A main heat exchanger section 134 is arranged on the upstream side, and a sub heat exchanger section 136 is arranged on the downstream side.

The hot water circulation passage 138 of the heating device (for example, floor heating device, bathroom heater / dryer, air conditioner, etc.) has a forward passage portion 140 for supplying hot water to the heating device, and a heat exchanger for heating. It has a return flow passage part 142 for returning hot water toward 130, the forward flow passage part 140 is connected to the main heat exchanger part 132 of the heat exchanger 130, and the return flow passage part 142 is its sub heat exchanger part 134. It is connected to the. In addition, the return flow path section 142
A hot water storage tank 144 for storing hot water and a circulation pump 146 for circulating the hot water are provided in the. Therefore,
The hot water from the return flow path 142 of the hot water circulation flow path 138 is
Heat is exchanged in the auxiliary heat exchanger portion 134 of the heating heat exchanger 130, sensible heat and latent heat in the combustion exhaust gas are recovered in the auxiliary heat exchanger portion 134, and then the main heat exchanger portion 1
32, heat exchange is performed, sensible heat in the combustion exhaust gas is recovered, and hot water heated and thus heat-exchanged in the heating heat exchanger 130 is sent to the heating device through the outward flow path portion 140, In this way, the warm water flows into the warm water circulation channel 138.
Circulated through.

In the heating heat exchanger 130 as well, the auxiliary heat exchanger section 134 recovers the latent heat in the combustion exhaust gas.
Condensation will be generated in the sub heat exchanger section 134,
In connection with this, the drain water discharging means 152 is also provided in the hot water supply combustion device section 104. The drain drainage means 152 is the housing part 1 of the heating combustion device part 104.
A drain receiving portion 154 provided at a predetermined portion of 54 (specifically, a portion located below the auxiliary heat exchanger portion 134);
Drain drainage channel 156 extending from the drain receiving portion 154
And the drain discharge flow path 156 includes the hot water supply combustion device section 10
2 is connected so as to join the drain drainage flow channel 52 of the second drain drainage flow channel 52, and the mixing tank 5 is connected to the downstream side by this merged portion of the drain drainage flow channel 52.
3 is provided. Therefore, the heating combustion device unit 104
The water condensed in the sub heat exchanger section 134 is dropped and collected in the drain receiving section 154, passes from the drain receiving section 154 through the drain drainage channel 156, and further, the hot water supply combustion apparatus section 102.
It is discharged to the outside through the drain drainage channel 52.

Combustion device sections 102 and 10 for hot water supply and heating
The tap water supply means 158 for neutralizing the drain water is connected to the mixing tank 53 of the drain drain passage 52 through which the drain water from the drain water is discharged. The tap water supply means 158 in the second embodiment is the hot water supply combustion device section 10.
The first and second tap water supply passages 160, 162 connecting the tap water supply passage 42 for supplying tap water to the second hot water supply heat exchanger 36 and the drain drain passage 52, and these first And the second tap water supply passages 106 and 162, and the first and second water opening / closing valves 164 and 166. When the first water opening / closing valve 164 is in the open state, the tap water supply passage 42 Tap water from the mixing tank 5 through the first tap water supply passage 160.
3 and the second water on-off valve 166 is opened, the tap water from the tap water feed passage 42 is fed to the mixing tank 53 through the second tap water feed passage 162.

In this second embodiment, the tap water supply means 158 (first and second water opening / closing valves 164, 166) is controlled by the control means 168, which controls the operation control means 170 and the timer 172. Contains. The operation control means 170 includes the first and second water opening / closing valves 164, 16.
6 is the first and second water on-off valves 164, corresponding to the operating states of the hot water supply and heating combustion devices 102, 104, that is, the open / closed states of the hot water supply source gas on-off valve 30 and the heating source gas on-off valve 122. Opening and closing control of 166. In this embodiment, the first water on-off valve 164 corresponds to the hot water supply source gas on-off valve 30, and the second water on-off valve
The water opening / closing valve 166 corresponds to the heating source gas opening / closing valve 122, and the operation control unit 170 controls the hot water supply source gas opening / closing valve 30.
Is open, the first water opening / closing valve 164 is opened based on the open state signal from the hot water source gas opening / closing valve 30.
When the heating original gas on-off valve 122 is open, the second water on-off valve 166 is opened based on the open signal from the heating original gas on-off valve 122.

Next, the neutralization process of the drain water in the above-described combustion device 2A will be described with reference to FIG. 6 together with FIG. First, in step S-21, it is determined whether or not the combustion device 2A has operated, and when the combustion device 2A is in the non-operational state, the process proceeds to step S-22, and the first and second water opening / closing valves 164 and 166 are closed. Held in a state. At this time, the hot water supply and heating combustion device units 102 and 104
There is no combustion in the combustion burners 36, 130 of the
Drain water is not generated in the combustion device 2A, the first and second water opening / closing valves 164 and 166 are kept closed, and tap water is not supplied from the tap water supply means 158.

When the combustion device 2A operates, step S-
The routine proceeds from 21 to step S-23, and first, it is determined whether or not the hot water supply combustion device section 102 is in the operating state, in other words, whether or not the hot water supply source gas on-off valve 30 is in the open state. When the hot water supply combustor unit 102 is inactive, the hot water supply source gas on-off valve 30 is held closed, and the first water on-off valve 164 corresponds to the closed state of the hot water supply source gas on-off valve 30. The closed state is maintained (step S-24). On the other hand, when the hot water supply combustion device section 102 is in the operating state, the hot water supply source gas on-off valve 30 is open, and the hot water supply source gas on-off valve 30 is in the open state.
The first water on-off valve 164 is opened corresponding to the open state (step S-25).

Next, in step S-26, it is determined whether the heating combustion device section 104 is in an operating state, in other words, the heating source gas on-off valve 122 is in an open state.
When the heating combustion device unit 104 is not operating, the heating source gas on-off valve 122 is kept closed, and the second water on-off valve 166 corresponds to the closed state of the heating source gas on-off valve 122. The closed state is maintained (step S-27). On the other hand, when the heating combustion device unit 104 is in the operating state, the heating source gas on-off valve 122 is in the open state, and the second water on-off valve 166 corresponds to the opening state of the heating source gas on-off valve 122.
Is opened (step S-28).

In this way, the control means 168 responds to the operating states of the hot water supply and heating combustion device sections 102 and 104, in other words, the open and closed states of the hot water supply and heating source gas on-off valves 30 and 122, respectively. First and second water supply means 158
Since the water opening / closing valves 164, 166 are controlled to open / close, the sub heat exchanger parts 40, 1 of the heat exchangers 36, 130 for hot water supply and for heating.
A suitable amount of tap water for neutralizing the drain water generated at 34 is supplied from the tap water supply means 54 to the mixing tank 53 of the drain drainage channel 52, and the drain water is neutralized at this mixing tank 53. be able to.

Next, in step S-29, it is judged whether or not the hot water supply and heating source gas on-off valves 30 and 122 are closed, and the operating state of the combustion device 2A (combustion for hot water supply and heating) When one or both of the device units 102 and 104 continue to operate and one or both of the hot water supply and heating source gas on-off valves 30 and 122 are held in the open state, step S-23. Return to step S
-23 to step S-29 are repeatedly performed. On the other hand, when the operation of the combustion device 2A is completed and both the hot water supply and heating source gas on-off valves 30 and 122 are closed, the timer 172 is activated (step S-30), and the timer 172 is activated. Time up (step S-31)
Then, the first water opening / closing valve 164 is closed (step S-
32), and the second water opening / closing valve 166 is closed (step S-33).

In the above-described second embodiment, the operating states of the hot water supply combustion device section 102 and the heating combustion device section 104,
In other words, the first and second water on / off valves 164 and 166 of the tap water supply means 158 are controlled to be opened / closed in accordance with the open / closed states of the hot water supply and heating source gas on / off valves. The technical idea of the first embodiment in the hot water supply combustion device section 102 and / or the heating combustion device section 104 (the supply amount of tap water from the tap water supply means is controlled according to the combustion state of the combustion burner). May be combined.

Although various embodiments of the combustion apparatus according to the present invention have been described above, the present invention is not limited to such embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. is there.

For example, in both the first and second embodiments, the exhaust passage extends laterally, and the main heat exchanger portion of the heat exchanger is arranged on the upstream side of the exhaust passage. The description has been made by applying to the combustion device of the form in which the auxiliary heat exchanger part 36 is arranged on the downstream side thereof, but the invention is not limited to the combustion device of such a form and, for example, upward (or downward) from the combustion chamber. The exhaust flow path extends, the main heat exchanger section is disposed on the upstream side of the exhaust flow path, and the sub heat exchange is performed on the downstream side of the exhaust flow path above (or below) the main heat exchanger section. The same can be applied to the case in which the vessel portion is arranged.

Further, for example, in the above-described embodiment, the drainage drainage channel 52 is provided with the mixing tank 53, and the drain water and the tap water are mixed in the mixing tank 53. If mixing is possible, the mixing tank 53 can be omitted.

[0059]

According to the combustion device of claim 1 of the present invention,
The combustion burner is composed of a plurality of burner parts, the original gas on-off valve is arranged in the gas supply flow path for supplying the fuel gas to the combustion burner, and the branch supply flow path part on the downstream side of the gas supply flow path is provided. A gas switching valve is provided, and the control means controls the supply amount of tap water based on the open / closed states of the original gas opening / closing valve and the gas switching valve. Therefore, the supply amount of tap water can be controlled with a simple configuration and simple control. It can be controlled as required and wasteful use of tap water can be suppressed.

According to the combustion apparatus of claim 2 of the present invention, the tap water supply means includes a tap water supply passage having a main passage portion and a branch passage portion, a water opening / closing valve, and a water switching opening / closing valve. Have
The control means controls the opening / closing of the water opening / closing valve and the switching opening / closing valve based on the open / closed states of the original gas opening / closing valve and the gas switching valve. Therefore, the tap water supply should be controlled as required by simple control. You can

According to the third aspect of the combustion apparatus of the present invention, the gas supply passage has a plurality of branch supply passage portions, and a gas switching valve is arranged in each branch supply passage portion. The tap water supply passage is provided with a plurality of branch passage portions corresponding to the number of the branch supply passage portions, each branch passage portion is provided with a water switching valve, and the control means is Depending on the open / closed state of the gas switching valves in the multiple branch supply flow paths, the water switching valves in the branch flow paths of the tap water supply flow path are controlled to open / close, so the amount of tap water supplied can be controlled easily. It can be controlled as desired.

According to the fourth aspect of the present invention, the combustion device comprises a heating combustion device section and a hot water supply combustion apparatus section, and the fuel gas is supplied to the combustion burner of the heating combustion apparatus section. A heating source gas on-off valve is provided in the heating gas supply flow path, and a hot water source gas on-off valve is installed in the hot water supply gas supply flow path that supplies fuel gas to the combustion burner of the hot water supply combustion device section. Since the control means controls the supply amount of tap water from the tap water supply means based on the open / closed states of the heating source gas on / off valve and the hot water supply source gas on / off valve, a simple configuration and simple control can be used. In addition, the supply amount of tap water can be controlled as required according to the operating state of the combustion device section, and wasteful use of tap water can be suppressed.

According to the combustion apparatus of claim 5 of the present invention, the tap water supply means is provided with the first and second tap water supply passages, and the first and second tap water supply passages are provided with the first and second tap water supply passages. A second water on-off valve is provided, and the control means controls the opening and closing of the first and second water on-off valves in accordance with the open / close state of the heating source gas on-off valve and the hot water supply source gas on-off valve. It is possible to supply the amount of tap water necessary for neutralizing the drain water generated in the combustion burner of the heating combustion device section with simple control.

Further, according to the combustion apparatus of the sixth aspect of the present invention, since the tap water is supplied from the tap water supply means until a predetermined time elapses after the combustion of the combustion burner is completed, the post-combustion drain drain passage It is also possible to neutralize the drain water flowing through.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a first embodiment of a combustion device according to the present invention.

2 is a diagram showing the relationship between the open / closed states of first and second gas switching valves and the supply amount of fuel gas in the combustion apparatus of FIG.

3 is a diagram showing the relationship between the open / closed states of the first and second gas switching valves and the water open / closed valves and the open / closed states of the first and second switching on / off valves in the combustion apparatus of FIG. 1. FIG.

4 is a flowchart showing a part of control of the combustion apparatus of FIG.

FIG. 5 is a schematic diagram of a second embodiment of a combustion device according to the present invention.

FIG. 6 is a flowchart showing a part of control of the combustion device of FIG.

[Explanation of symbols]

2,2A combustion device 6,112 Combustion chamber 8,128 exhaust passage 12,106 Combustion burner 30,122 original gas on-off valve 32,34 gas switching valve 36,130 heat exchanger 38,132 Main heat exchanger section 40,134 Secondary heat exchanger section 48,152 Drain drainage means 52,156 drain drainage channel 54,158 Tap water supply means 56,160,162 Tap water supply channel 64,164,166 Water on-off valve 66,68 switching valve 70,168 Control means 102 Combustion unit for hot water supply 104 Combustion unit for heating

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sada Saito             4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka             Gas Co., Ltd. F-term (reference) 3L034 BA25 DA01 DA06                 3L036 AA14

Claims (6)

[Claims] 1. A combustion burner for producing combustion exhaust gas,
A heat exchanger for exchanging heat with the combustion exhaust gas to recover sensible heat and latent heat, drain drainage means for collecting and discharging drain water generated by heat exchange of the heat exchanger, and the drain It comprises a tap water supply means for supplying tap water to the drainage means, and a control means for controlling the supply amount of tap water from the tap water supply means, and the drain water drainage means from the tap water supply means By supplying tap water to the drain discharge passage of, a combustion device for neutralizing the drain water flowing through the drain discharge passage, the combustion burner is composed of a plurality of burner portion, The downstream side portion of the gas supply passage for supplying the fuel gas to the combustion burner is branched into a main supply passage portion and a branch supply passage portion, and the main supply passage portion and the branch supply passage portion correspond to each other. Connected to the burner section In the gas supply passage, a source gas on-off valve is arranged on the upstream side of the main supply passage portion and the branch supply passage portion, and a gas switching valve is provided in the branch passage portion. The combustion is characterized in that the control means controls the supply amount of tap water supplied from the tap water supply means based on the open / closed states of the original gas opening / closing valve and the gas switching valve. apparatus. 2. The tap water supply means supplies tap water to the drain drain passage of the drain drain means, and a part of the tap water is branched into a main passage portion and a branch passage portion. Supply of tap water through the main flow path portion, a water opening / closing valve for stopping supply, and supply of tap water through the branch flow path portion,
A switching on-off valve for stopping the supply, and the control means controls opening and closing of the water on-off valve and the switching on-off valve in accordance with open and closed states of the original gas on-off valve and the gas switching valve. The combustion device according to claim 1. 3. A plurality of branch supply flow passage parts are provided on the downstream side of the gas supply flow passage, and the gas switching valves are arranged in the plurality of branch supply flow passage parts, respectively. A plurality of branch flow passage parts corresponding to the number of the branch supply flow passage parts of the gas supply flow passage are provided in the part of the tap water supply flow passage, and the plurality of branch flow passage parts are respectively switched to each other. An on-off valve is provided, and the control means corresponds to the open / closed states of the gas switching valves of the plurality of branch supply flow passage parts of the gas supply flow passage, and the plurality of the tap water supply flow passages are connected to each other. The combustion apparatus according to claim 2, wherein the switching on-off valve of the branch flow path section is controlled to be opened and closed. 4. A heating combustion device unit for supplying hot water to a heating device, and a hot water supply combustion device unit for supplying hot water to the heating device. The heating combustion device unit and the hot water supply combustion device unit. Are a combustion burner for generating combustion exhaust gas, a heat exchanger for exchanging heat with the combustion exhaust gas to recover sensible heat and latent heat, and drain water generated by heat exchange of the heat exchanger. And a drain drainage means for collecting and discharging the drainage means, and the drain drainage means of the heating device combustion device section and the drain drainage means of the water heater combustion device section combine drain water for draining. Connected to the
Furthermore, a combustion device provided with tap water supply means for supplying tap water used for diluting and neutralizing drain water, and control means for controlling the tap water supply means, A heating gas supply passage for supplying a fuel gas is connected to the combustion burner of the combustion device section, and a heating source gas on-off valve is arranged in the heating gas supply passage for supplying hot water. A hot water supply gas supply passage for supplying a fuel gas is connected to the combustion burner of the combustion device section, and a hot water supply source gas on-off valve is disposed in the hot water supply gas supply passage, and the control means is provided. A combustion apparatus, wherein the supply amount of tap water supplied from the tap water supply means is controlled based on open / closed states of the heating original gas opening / closing valve and the hot water supply original gas opening / closing valve. 5. The tap water supply means includes first and second tap water supply passages for supplying tap water, and first and second tap water supply passages arranged in the first and second tap water supply passages. A water opening / closing valve, wherein the control means controls opening / closing of the first and second water opening / closing valves in accordance with opening / closing states of the heating source gas opening / closing valve and the hot water supply source gas opening / closing valve. The combustion apparatus according to claim 4, wherein the combustion apparatus is a combustion apparatus. 6. The combustion apparatus according to claim 1, wherein the tap water supply means stops the supply of tap water after a lapse of a predetermined time after the combustion of the combustion burner is completed. .