JP2001173912A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustor which reduces cost of the device, can be readily fitted to a water heater in which a device for directing flame formation is made compact. SOLUTION: A combustor is provided with a combusting portion having a plate-like flame hole forming member in which a plurality of flame holes are formed in a scattered manner, for performing combustion and holding flames. The reverse side of the combusting portion is provided with a receiving chamber in the direction of formation of flames resulting from combustion in the combusting portion. The receiving chamber having the same or substantially the same size as the combusting portion receives a mixed gas of fuel and combustion air and supplies it to the entire combusting portion. The combustor is also provided with a mixed gas supply means for supplying the mixed gas to the receiving chamber. Further, a mixed gas channel 7 is constituted in a zigzag manner at the reverse side of the receiving chamber and along the surface of the flame hole forming member, and the exit end of the channel is permitted to communicate with the receiving chamber through a communicating portion 6, so that the mixed gas is supplied by the mixed gas supply means through the channel 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion section provided with a plate-like flame hole forming member in which a plurality of flame holes are formed in a dispersed state and holding and burning a flame. A receiving chamber that receives a mixture of fuel and combustion air and supplies the mixture to the entirety of the combustion section at the rear side portion is the same as or similar to the combustion section in the flame formation direction of the flame burning in the combustion section. The present invention relates to a combustion device provided with substantially the same size and provided with a mixture supply means for supplying the mixture to the receiving chamber.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Publication No. 5-605, for example, such a combustion apparatus as described above is an all-primary premixing type that burns a mixture of fuel gas and combustion air. A blower for supplying air for combustion by connecting the supply port thereof to the receiving chamber through the communication portion, and a mixture flow path having the outlet end thereof connected to the suction port of the blower. And a fuel jetting means for jetting fuel into the air blower, the mixture of combustion air and fuel gas is sucked into the blower casing through the suction port of the blower by the operation of the blower, and the air in the casing of the blower is blown. And is supplied to the receiving chamber through the supply port of the blower and is burned in the combustion section.

[0003]

However, in the combustion apparatus disclosed in the above-mentioned publication, since the air-fuel mixture flow path is communicated with the suction port of the blower, the air-fuel mixture mixed in the air-fuel mixture flow path is supplied to a blower or the like. The mixture is supplied to the receiving chamber by flowing the inside of the casing of the equipment, and for example, high safety is required for the equipment such as a drive motor of the blower that does not fly a spark, and the equipment is required to have a high safety. There was a risk that the cost would increase.

In order to solve this disadvantage, for example, FIG.
As shown in FIG. 5, an outlet-side end 41 a of the mixture flow passage 41 communicates with the receiving chamber 42, and a mixture supply means for supplying a mixture of combustion air and fuel gas to the reception chamber 42 through the mixture passage 41. Thus, an improved structure is conceivable in which the air-fuel mixture mixed in the air-fuel mixture flow path 41 is directly supplied to the receiving chamber 42 without flowing through the casing of equipment such as a blower.

A porous punching metal 45 for dispersing and flowing the air-fuel mixture throughout the flame hole forming member 44 is provided on the rear side of the flame hole forming member 44 in which the flame hole 43 is formed.
Is provided. And, although not shown, for example,
The mixture supply means includes combustion air supply means for supplying combustion air through an inlet of the mixture path 41, and fuel ejection means for ejecting fuel to the mixture path 41. It is conceivable that the blown combustion air is pushed into the air-fuel mixture flow path by the blowing pressure of the combustion air supply means and supplied.

By the way, in the improved structure, the air-fuel mixture flow path is bent along the flame forming direction of the flame burning in the combustion portion (the direction of arrow P in FIG. 9), so that the air-fuel mixture flow in the air-fuel mixture flow path is formed. By increasing the airflow distance,
Although the fuel gas and the air for combustion are sufficiently mixed,
In this case, since the air-fuel mixture flow path is configured to be bent along the flame forming direction, the space for the air-fuel mixture flow path becomes larger in the flame forming direction, and the apparatus becomes larger in the flame forming direction. For example, it becomes difficult to adapt to a hot water supply device in which an installation space is limited depending on an installation location or the like.

The present invention has been made in view of such a point, and an object of the present invention is to provide a combustion apparatus capable of reducing the cost of the apparatus and reducing the size of the apparatus in the flame forming direction. The point is to provide.

[0008]

In order to achieve this object, according to the first aspect of the present invention, a plurality of flame holes are formed in a dispersed state, and a plate-like shape for holding and burning a flame. A combustion section provided with a flame hole forming member is provided, and a receiving chamber for receiving a mixture of fuel and combustion air and supplying the mixture to the entire combustion section is provided at a position behind the combustion section. In the combustion apparatus, which is provided in the same or substantially the same size as the combustion part in a flame formation direction of the burning flame and provided with a mixture supply means for supplying the mixture to the reception chamber, At the back side of the chamber, an air-fuel mixture flow path whose outlet end is communicated with the receiving chamber through a communication part is formed in a bent shape along the surface direction of the flame hole forming member, and the air-fuel mixture supply means Supply the mixture through the mixture passage. It is configured.

That is, since there is provided an air-fuel mixture passage having an outlet end communicating with the receiving chamber through the communication portion and an air-fuel supply means for supplying air-fuel mixture through the air-fuel mixture flow passage, the air-fuel mixture is supplied through the air-fuel mixture flow passage. Can be directly supplied to the receiving room without flowing through the casing of equipment such as a blower, and high safety is not required for the equipment, and the cost of the equipment can be reduced. It becomes possible.
Moreover, since the air-fuel mixture flow path is formed to be bent along the surface direction of the flame hole forming member, the air-fuel mixture flow path can be sufficiently utilized by utilizing the surface size of the flame hole forming member at the back side of the combustion part. And the space for the mixture flow path is reduced in the flame formation direction while sufficiently mixing the fuel and the combustion air, and the apparatus in the flame formation direction Can be reduced in size. As described above, according to the configuration of the first aspect, the cost of the apparatus is reduced, the size of the apparatus in the flame forming direction is reduced, and a good mixing state (good combustion state) is achieved. However, it is possible to provide a combustion device that is easily adapted to a hot water supply device in which the installation space is limited.

According to the second aspect of the present invention, the communication portion is provided at a position corresponding to the center of the combustion portion when viewed in the flame formation direction, and the air-fuel mixture flow path is connected to the communication portion. After extending toward the one side from the disposition location, bends in different directions from each other, and is provided with a pair of bend path portions extending in the direction of the existence side of the communication portion after the bend. I have. That is, in the flame formation direction, the communication portion is disposed at a position corresponding to the center of the combustion portion, and the air-fuel mixture flow path is configured to include a pair of bent paths, so the air-fuel mixture flowing from the communication portion is provided. The air-fuel mixture can be supplied to the receiving chamber from each of the pair of curved road portions while the air-fuel mixture is supplied as uniformly as possible in the surface direction of the flame hole forming member. It is possible to accurately cope with combustion.

According to the third aspect of the present invention, the air-fuel mixture supplying means comprises: a combustion air supply means for supplying combustion air through an inlet in each of the pair of curved road portions; Each of the road portions is provided with fuel ejection means for ejecting fuel.

As a structure of the air-fuel mixture supply means, for example, a fuel nozzle for injecting fuel is provided at an inlet of each of the pair of curved road portions, and combustion air is injected into the air-fuel mixture flow path by an ejector action by the injection of the fuel. In this case, there is a limit to the amount of combustion air that can be supplied into the mixture flow path in relation to the fuel pressure.
There is a problem that a too large amount of combustion air cannot be supplied.

[0013] On the other hand, the air-fuel mixture supply means supplies combustion air through an inlet in each of the pair of curved road portions, and the fuel air ejects fuel to each of the pair of curved road portions. And a jetting means, so that the combustion air blown by the combustion air supply means can be pushed and supplied into the mixture flow path by the blowing pressure of the combustion air supply means. Thus, a large amount of combustion air can be supplied.

According to the fourth aspect of the present invention, the inlets in each of the pair of curved road portions are formed as one inlet. That is, in the case where the inlets in each of the pair of curved road portions are separately provided, it is necessary to separately supply combustion air to the inlets in each of the pair of curved road portions. Although the configuration may be complicated, the introduction ports in each of the pair of curved road portions are formed as one introduction port, so that the mixture supply means supplies each of the pair of curved road portions through one introduction port. The air for combustion can be supplied, and the configuration of the air-fuel mixture supply means can be simplified.

According to the fifth aspect of the present invention, a curved road portion opening / closing means for opening and closing one of the pair of curved road portions is provided. That is, one of the pair of curved road portions is closed by the curved road portion opening / closing means by the cooperation with the third and fourth aspects, so that one of the curved roads passes through one inlet through the combustion air supply means. Since the combustion air can be supplied only to the portion, when the same amount of combustion air is supplied, the combustion air is supplied to each of the pair of curved road portions through one inlet by the combustion air supply means. It is possible to increase the flow velocity of the combustion air flowing through the curved road portion, as compared with the supply. Therefore, even when a small amount of combustion air is supplied, the fuel can be ejected to the combustion air having a relatively high flow velocity, so that the fuel is reliably supplied to and mixed with the combustion air. Becomes possible.

According to the sixth aspect of the present invention, the communication portion is dispersedly disposed in each portion of the combustion portion as viewed in the flame formation direction, and is connected to each of the plurality of communication portions separately. After each of the air-fuel mixture flow paths is extended toward one side from the location of the communication portion, the air-fuel mixture flow channel is reversely bent in the direction in which the communication portion exists, and the communication portion is present after the reverse bending. It is configured to extend in the lateral direction. That is, in the flame formation direction, since the communicating portions are dispersedly arranged in the respective portions of the combustion portion, it is possible to supply the air-fuel mixture to the respective portions of the burning portion through the plurality of communicating portions,
Therefore, the air-fuel mixture can be uniformly supplied to the combustion section in the surface direction of the flame forming member. Moreover, in the flame formation direction, each of the air-fuel mixture flow paths individually connected to each of the plurality of communicating portions is bent in the same direction, so that the air-fuel mixture flow distance in each of the air-fuel mixture flow paths is minimized. The length can be increased, and it becomes possible to promote the mixing of the fuel and the combustion air. Therefore,
According to the configuration of the sixth aspect, it is possible to promote the mixing of the fuel and the combustion air while uniformly supplying the air-fuel mixture to the combustion section in the surface direction of the flame forming member.

According to the seventh aspect of the present invention, the mixture supply means supplies combustion air through an inlet in each of the plurality of mixture paths, and the plurality of mixture air supply means supplies the combustion air to the plurality of mixture paths. And a fuel ejection means for ejecting fuel into each of the air flow paths. As a configuration of the air-fuel mixture supply means, for example, a fuel nozzle that blows fuel into an inlet of each of a plurality of air-fuel mixture channels is provided, and combustion air is supplied into the air-fuel mixture flow channel by an ejector action by the injection of the fuel. However, in this case, there is a limit to the amount of combustion air that can be supplied into the air-fuel mixture flow path in relation to the fuel pressure, and there is a problem that a large amount of combustion air cannot be supplied. .

[0018] On the other hand, the mixture supply means includes a combustion air supply means for supplying combustion air through an inlet in each of the plurality of mixture paths, and a fuel jetting fuel to each of the plurality of mixture paths. And a jetting means, so that the combustion air blown by the combustion air supply means can be pushed and supplied into the mixture flow path by the blowing pressure of the combustion air supply means. Thus, a large amount of combustion air can be supplied.

According to the invention described in claim 8, the inlet in each of the plurality of air-fuel mixture flow paths is formed as one inlet. That is, in the case where the inlets in each of the plurality of air-fuel mixture flow paths are separately provided, it is necessary to separately supply combustion air to the inlets in each of the plurality of air-fuel mixture flow paths. Although the configuration may be complicated, since the inlets in each of the plurality of air-fuel mixture flow paths are formed as one inlet, each of the plurality of air-fuel mixture flow paths is provided through one inlet by the combustion supply means. The air for combustion can be supplied, and the configuration of the air-fuel mixture supply means can be simplified.

According to the ninth aspect of the present invention, a part of the plurality of air-fuel mixture flow paths is provided with flow path opening / closing means for opening and closing the air-fuel mixture flow paths. That is, claim 7
And part 8 are closed by the channel opening / closing means by the channel opening / closing means, so that only one of the mixture flow paths is passed through one inlet by the combustion air supply means. Since the combustion air can be supplied, when supplying the same amount of combustion air, the combustion air supply means supplies the combustion air to each of the plurality of air-fuel mixture flow paths through one inlet through a single inlet. In addition, it is possible to increase the flow velocity of the combustion air flowing through the mixture flow path. Therefore, even when a small amount of combustion air is supplied, the fuel can be ejected to the combustion air having a relatively high flow velocity, so that the fuel is reliably supplied to and mixed with the combustion air. Becomes possible.

According to the tenth aspect of the present invention, the receiving chamber is divided into a plurality of chamber portions as viewed in the flame forming direction, and the communication portion corresponds to each of the plurality of chamber portions. It is arranged. That is, by the cooperative action with claims 7 to 9, some of the plurality of air-fuel mixture channels are closed by the channel opening / closing means in a state where the air-fuel mixture channels are closed.
Combustion air can be supplied to only a part of the receiving chamber by supplying combustion air through one inlet by the combustion air supply means. , It is possible to perform combustion only in a part of the combustion air, so that the minimum combustion amount can be made smaller. Moreover, when the combustion air is supplied to the non-combustion portion of the combustion portion, the combustion portion is cooled by the combustion air. Is closed so that the air for combustion can be prevented from being supplied to the non-combustion portion. Therefore, it is the ratio of the maximum combustible amount and the minimum combustible amount of the combustion section,
The turndown ratio can be increased, and the combustion efficiency can be improved by preventing combustion air from being unnecessarily supplied to the non-burning combustion portion.

According to the eleventh aspect of the present invention, the combustion portion is located at a position on the back side of the flame hole forming member,
A porous member is provided for dispersing and flowing the air-fuel mixture throughout the flame hole forming member. The receiving chamber receives the air-fuel mixture flowing from the communication portion and disperses the mixture in the surface direction of the flame hole forming member. A dispersion member for guiding and flowing is provided. That is, since the air-fuel mixture is supplied to the receiving chamber through the communication part, the air-fuel mixture is supplied and supplied to the receiving chamber in a state where a large amount of air-fuel mixture flows to the location where the communication part is disposed in the flame formation direction. Since the air-fuel mixture is supplied to the flame hole forming member in an uneven state, there is a possibility that the combustion in the combustion section becomes unstable. Further, the air-fuel mixture can be supplied to the flame-hole forming member in a state of being dispersed and flown by the porous member to the entire flame-hole forming member, and the air-fuel mixture can be uniformly supplied to the entire flame-hole forming member. It is possible to stabilize the combustion of the combustion section.

According to the twelfth aspect of the present invention, the mixture flow passage is provided with a mixing promoting portion for disturbing the flow of the mixture to promote mixing of the fuel and the combustion air. . That is, by providing the mixing promoting portion, it is possible to supply the air-fuel mixture sufficiently mixed with the fuel and the combustion air to the flame hole forming member, so that the combustion of the combustion portion is further stabilized. Becomes possible.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which a combustion device according to the present invention is applied to a hot water supply device will be described with reference to the drawings. [First Embodiment] As shown in FIG.
The hot water supply unit K is configured to heat the supplied water and supply hot water to the hot water tap 19, a control unit H that controls the operation of the hot water supply unit K, and a remote control operation unit R that instructs the control unit H to give operation information. ing.

The hot water supply unit K has a plate-shaped flame hole forming member 1 in which a plurality of flame holes 3 are formed in a dispersed state and holds a flame and burns downward. A main body portion including a combustion section 2 of the first embodiment, a heat exchanger 4 for water heating heated by the combustion of the combustion section 2, and an exhaust gas collection box 31 for collecting combustion exhaust gas heat-exchanged in the heat exchanger 4. P. Incidentally, the flame hole forming member 1 can be formed and implemented in a net shape, or can be implemented by combining a block-shaped body and forming a plate shape as a whole. The exhaust collection box T receives and collects the condensed water, that is, the drain that has fallen from the heat exchanger 4, on the bottom surface inside the exhaust collection box T, and collects and collects the exhaust collection box 3 through the discharge path 32.
There is provided a saucer-shaped condensed water recovery member 33 to be discharged outside the apparatus 1. The discharge path 32 is connected to a neutralization device C, and the neutralization device C neutralizes the drain. The flue gas heat-exchanged in the heat exchanger 4 is collected in the exhaust gas collection box 31 and then exhausted to the outside.

The heat exchanger 4 allows the main heat exchanger 4a to exchange heat between the flue gas from the combustion section 2 and the supplied water, and the latent heat recovery heat exchanger 4b to exchange heat with the main heat exchanger 4a.
The heat exchange between the flue gas used for water heating and the water before passing through the main heat exchanger 4a is performed in a state involving condensation of moisture in the flue gas, and the residual sensible heat of the flue gas It is configured to recover the retained latent heat. In this embodiment, the heat exchanger 4 is composed of the main heat exchanger 4a and the latent heat recovery heat exchanger 4b, but may be composed of only the main heat exchanger 4a.

FIG. 2 is a cross-sectional top view of the structure of the combustion section 2 and the receiving chamber 5 and the mixing section F provided on the back side thereof, and FIG. 3 is a longitudinal sectional front view thereof.
The receiving chamber 5 that receives a mixture of fuel and combustion air and supplies the mixture to the entirety of the combustion unit 2 is burned in the combustion unit 2 at a location on the back side of the combustion unit 2. It is provided with the same or substantially the same size as the combustion part 2 when viewed in the flame formation direction of the flame. Further, a mixing section F connected to the receiving chamber 5 through the communicating section 6 is provided at a location on the back side of the receiving chamber 5.
Are provided in the same or substantially the same size as the combustion section 2 and the receiving chamber 5 in the flame formation direction.
An air-fuel mixture flow path 7 having its outlet side end 7 a communicating with the receiving chamber 5 through the communication part 6 is provided in a bent shape along the surface direction of the flame hole forming member 1. That is, the combustion part 2 provided with the flame hole forming member 1, the receiving chamber 5, and the mixing part F are provided in the same or substantially the same rectangular shape when viewed in the flame formation direction. Incidentally, as shown in FIG. 3, the communication port 6 a between the outlet side end 7 a of the mixture flow path 7 and the communication section 6, as viewed in the plane direction of the flame hole forming member 1,
The shielding member B for shielding the lower end side in the flame forming direction is provided with the communication port 6.
a, so that the opening area of the communication port 6a is about 2/3 of the total opening area.

The communication part 6 of the receiving chamber 5 is provided at a position corresponding to the center of the combustion part 2 when viewed from the flame forming direction.
The air-fuel mixture channel 7 is extended in one direction from the location where the communication portion 6 is provided, then bent in different directions, and then extended in the direction in which the communication portion 6 exists after the bending. And a pair of curved road portions 7b. Each of the pair of curved road portions 7b is provided with a mixing promoting portion 10 that disturbs the flow of the air-fuel mixture to promote the mixing of the combustion air and the fuel gas. Are formed as one inlet 11. By the way, the mixing promoting unit 10
Are formed at the center of the curved path portion 7b in the flow path width direction when viewed in the flame formation direction, and are formed such that the upstream side in the flow direction of the air-fuel mixture becomes narrower in the flow path width direction of the curved path section 7b. Have been.

That is, the air-fuel mixture flow path 7 extends from the inlet 11 on one side corresponding to one longitudinal end of the flame hole forming member 1 toward the other side in the flame formation direction. The other side portion is bent in the same direction along the surface direction of the flame hole forming member 1 and, after the bending, extends in the direction in which the communication portion 6 exists, and the outlet side end portion 7a
Is connected to the communication section 6. Therefore, the flow of the mixture of the combustion air and the fuel gas is reversed at the other side in the longitudinal direction of the flame hole forming member 1, and is supplied to the receiving chamber 5 through the communication portion 6. .

The combustion section 2 is provided with a punching metal 8 serving as a porous member for dispersing and flowing an air-fuel mixture throughout the flame hole forming member 1 at a position behind the flame hole forming member 1. The receiving chamber 5 is provided with a dispersion member 9 that receives the air-fuel mixture flowing from the communicating portion 6 and distributes and guides the mixture in the surface direction of the flame hole forming member 1. That is, the dispersing member 9 is a plate-like member provided with a plurality of holes, and is disposed at a position corresponding to the center of the combustion unit 2 when viewed in the flame forming direction, and mixes the air-fuel mixture flowing from the communication unit 6, When viewed in the flame forming direction, it is configured so as to be dispersed and guided to the side of the receiving chamber 5, and the amount of the air-fuel mixture supplied to the flame hole forming member 1 is controlled by the dispersing member 9 and the punching metal 8. The member 1 is made uniform in the surface direction.

A turbo fan 12 is provided as combustion air supply means for supplying combustion air through the inlet port 11, and a gas supply pipe 13 as fuel ejection means for ejecting fuel to each of the pair of curved path portions 7b. Is provided. That is, the mixture supply means W for supplying the mixture through the mixture passage 7 is provided with the turbo fan 12 and the gas supply pipe 13, and the gas supply pipe 1
3, fuel gas is ejected from the gas header N to each of the pair of curved road portions 7 b through the gas supply pipes 13, and the combustion air blown by the turbofan 12 is blown by the blowing pressure of the turbofan 12. It is configured so as to be pushed and supplied into each of the pair of curved road portions 7b.

The gas supply pipes 13 are disposed in each of the pair of curved road portions 7b so as to be located at the center of the curved road portion 7b in the flow path width direction when viewed from the flame forming direction. In the pipe 13, the gas ejection holes 14 are provided in the flame forming direction in a manner distributed around the axis L along the flame forming direction of the gas supply pipe 13 in the flow path width direction of the curved path portion 7 b, The fuel gas is ejected to the downstream side in the flow direction of the combustion air.

As described above, the mixture passage 7 having the outlet end 7a communicating with the receiving chamber 5 through the communication portion 6, and the mixture supply means W for supplying the mixture through the mixture passage 7
Is provided, the air-fuel mixture mixed in the air-fuel mixture flow path 7 can be directly supplied to the receiving chamber 5 without flowing through the casing of the equipment, and high safety is required for the equipment. Therefore, the cost of the apparatus can be reduced. In addition, since the air-fuel mixture flow path 7 is provided with a pair of bent path portions 7 b formed in a bent shape along the surface direction of the flame hole forming member 1, the flame hole forming member on the back side of the combustion portion 2 is formed. (1) The mixture flow distance in the mixture passage 7 can be lengthened by making full use of the size in the plane direction of 1 and the mixture is supplied to the receiving chamber 5 from each of the pair of bent path portions 7b. Thus, the space for the air-fuel mixture flow path 7 is reduced in the flame forming direction, so that the size of the apparatus in the flame forming direction can be reduced, and it is possible to cope with high-load combustion. Incidentally, the length of the mixture flow distance is set to such a length that the pressure loss does not become excessive.

The heat exchanger 2 is connected to a water inlet 15 to which water is supplied from, for example, a domestic water supply, and a hot water outlet 16 for discharging hot water after heating.
Has a flow rate sensor 1 for detecting a flow rate to the heat exchanger 4.
7. An incoming water temperature thermistor 18 for detecting the temperature of the water supplied through the incoming water channel 15 is provided. The tap water path 16 is provided with a tap water temperature thermistor 20 for detecting the temperature of tap water from the tap tap 19.

A gas supply path 21 for supplying a fuel gas to the gas supply pipe 13 has an electromagnetically operated on-off valve 22 for intermittently supplying fuel, and a fuel supply amount (a combustion amount of the combustion unit 2) can be changed and adjusted. An electromagnetically operated gas amount control valve 23 is provided. An igniter 24 for performing an ignition operation on the combustion unit 2 and a frame rod 25 for detecting whether or not the burner 3 is ignited are provided near the combustion unit 2. Are provided.

The remote control R is provided with an operation switch 26 for instructing the start and stop of the operation of the hot water supply unit K, a temperature setting switch 27 capable of changing and setting a target temperature for tapping, a tapping temperature and a target temperature for tapping. The display unit 28 includes an operation lamp 29 for displaying that the burner 3 is in a combustion state, an operation lamp 29 for displaying that the burner 3 is in a combustion state, and the like.

The control section H is provided with a microcomputer. The control section H starts the flow of water to the heat exchanger 4 based on an operation command of the remote control operation section R and starts the combustion section 2.
Is started to stop the combustion of the combustion unit 2 as the flow of water to the heat exchanger 4 is stopped, and when the flow of water to the heat exchanger 4 is detected. ,
A process for adjusting the hot water temperature to the hot water target temperature is executed.

That is, after the hot water supply operation state is set in accordance with the ON operation of the operation switch 26, and when the water flow rate detected by the water flow rate sensor 17 in response to the opening operation of the hot water tap 19 exceeds the set water flow rate, The turbo fan 12 is operated, the intermittent valve 22 is opened, and the gas amount adjusting valve 23 is opened and adjusted to the ignition gas amount, and the igniter 24 ignites the combustion unit 2 and the flame rod 25 Confirm by

Thereafter, the tap water temperature is determined on the basis of the detection information of the inlet water temperature thermistor 18, the tap water temperature thermistor 20, the flow rate sensor 17, and the information of the tap water target temperature set by the temperature setting switch 27. The amount of combustion in the combustion section required to reach the target temperature for tapping is calculated. Then, while adjusting and controlling the gas amount control valve 23 so that the gas amount corresponds to the obtained combustion amount, the turbo fan 12 is controlled so that the ventilation amount of the turbo fan 12 becomes an appropriate combustion state with respect to the adjusted gas amount. And feed-back control for finely adjusting the opening of the gas amount adjusting valve 23 so that the detected temperature of the tapping temperature thermistor 20 becomes the tapping target temperature. . In this way, the water from the water inlet channel 15 is heat-exchanged by the heat exchanger 4, and the tap water at the target temperature for tapping is discharged from the tap tap 19.

[Second Embodiment] The second embodiment is different from the first embodiment in that the receiving chamber 5, the communication part 6,
This shows another embodiment of the configuration of the mixture flow path 7, and the configuration will be described with reference to the drawings. In addition, about the structure similar to the said 1st Embodiment, the detailed description is abbreviate | omitted by writing the same code | symbol etc.

A receiving chamber 5 provided on the back side of the combustion section 2
As shown in FIGS. 4 and 5, the mixing portion F has a flat shape having the same or substantially the same size as the combustion portion 2 having the flame forming member 1 when viewed in the flame formation direction of the flame burning in the combustion portion 2. It is provided in. The receiving chamber 5 is provided with a partition plate 34 along the short side of the flat mixing section F at a position corresponding to the center in the longitudinal direction of the flat mixing section F when viewed in the flame forming direction. However, when viewed in the flame forming direction, the first receiving chamber 5A and the second receiving chamber 5B are formed separately in two parts of the first receiving chamber 5A and the second receiving chamber 5B in a state of being distributed and arranged in each part of the combustion part 2 and arranged in the longitudinal direction of the mixing part F. I have.

The first receiving room 5A has a first communication portion 6A.
The second receiving room 5B is provided with a second communicating portion 6B, and the communicating portion 6 is provided in each of the chamber portions 5A of the receiving room 5, and the first communicating portion 6A and the second communicating portion are provided. Each of the portions 6B is disposed at a position corresponding to the center of each chamber portion when viewed in the flame formation direction. That is, when viewed in the flame formation direction, the flat-shaped longitudinal introduction port 11
The first receiving chamber 5A is formed on the side close to, and the second receiving chamber 5B is formed on the side far from the flat longitudinal introduction port 11. Incidentally, a porous punching metal 8 is provided on the back side of the flame hole forming member 1 corresponding to each chamber portion, and a dispersion member 9 is provided on each chamber portion 5a.

The mixture flow path 7 connected to the communication section 6
A first mixture passage 7A connected to the first communication portion 6A;
A second air-fuel mixture flow path 7B connected to the communication portion 6B is provided. Each of the mixture flow paths 7A and 7B respectively connected to each of the two communication sections 6 is connected to the communication section 6.
Is extended in the direction of the side of the communication portion 6 after being extended to one side from the disposition location, and is extended in the direction of the side of the communication portion 6 after the inversion bending. ing. Each of the air-fuel mixture flow paths 7A and 7B is provided with a mixing promoting unit 10, and is provided with two air-fuel mixture flow paths 7A and 7B.
The inlets in each of A and 7B are formed as one inlet 11.

The second air-fuel mixture flow path 7B has the second
A rotary damper 35 is provided as a passage opening / closing means for opening and closing the mixture flow passage 7B by a rotation operation. A solid line in FIG. 4 shows a state where the second mixture passage 7B is opened, and a dotted line in FIG. The figure shows a state in which the two-fuel mixture channel 7B is closed. Although not shown, the damper 35 is formed with a small hole that allows a small amount of combustion air to flow even when the second air-fuel mixture flow path 7B is closed. Will be supplied. Incidentally, other types of rotary dampers can be used as the damper, and any flow opening / closing means may be used as long as it can open and close the air-fuel mixture flow path.

That is, the first connecting portion connected to the first communication portion 6A
The mixed gas flow path 7A and the second mixed gas flow path 7B connected to the second communication portion 6B are directed from the inlet 11 on one side corresponding to one longitudinal end of the mixing section F to the other side. To extend over the entire length in the longitudinal direction, bend and bend at the other lateral side along the surface direction of the flame hole forming member 1, and extend in the direction of the communication portion 6 after the inverted bend. The outlet side end 7 a is configured to communicate with the communication portion 6. Therefore, the mixture of combustion air and fuel gas is
The flow direction is reversed at one lateral side in the longitudinal direction of the mixing section F, and is supplied to each chamber portion of the receiving chamber 5 through the communication section 6, and the damper 35 is rotated to operate the second mixed gas flow path 7B. By closing the first communication portion 6A.
Is configured to supply the air-fuel mixture only to the first receiving chamber 5A.

A turbo fan 12 for supplying combustion air through the inlet 11 is provided. A gas supply pipe 13 for injecting fuel into each of the gas mixture passages 7A and 7B is provided in the gas header N. A gas supply path 21 for supplying gas is branched and connected in correspondence with the two gas supply pipes 13, and a second side is provided downstream of the branch point.
An electromagnetic shut-off valve 36 for interrupting the supply of fuel gas to the gas supply pipe 13 of the air-fuel mixture flow path 7B is provided. That is, by opening and closing the shut-off valve 36, the state is switched between a state in which fuel is injected into the first mixture path 7A and the second mixture path 7B and a state in which fuel is injected only into the first mixture path 7A. I have to.

The control unit H is configured to control the operation of the hot water supply unit K based on an operation command of the remote control operation unit R, as in the first embodiment, and to determine the operation in the feedforward control. When the determined combustion amount is less than の of the maximum combustible combustion amount of the combustion unit 2, the damper 35 is rotated to operate the second mixture flow path 7.
B is closed to prevent the supply of combustion air to the second mixture path 7B, and the shutoff valve 36 is closed to supply fuel gas to the gas supply pipe 13 of the second mixture path 7B. In the shut-off state, the gas amount adjusting valve 23 and the turbo fan 12 are adjusted. When the calculated combustion amount is equal to or more than の of the maximum combustion amount, the second mixture path 7B is fully opened without operating the damper 35, and the shut-off valve 36 is opened. The gas amount adjusting valve 23 and the turbo fan 12 are adjusted.

That is, by controlling the damper 35 and the shut-off valve 36 in accordance with the obtained combustion amount, the state where the entire surface of the flame hole forming member 1 is burned in the flame forming direction and the first receiving chamber 5A Of the flame hole forming member 1 corresponding to
And the combustion state can be adjusted in two stages. Therefore, while the so-called turndown ratio, which is the ratio between the maximum combustible amount and the minimum combustion amount of the combustion unit 2, is increased, the combustion air is supplied to the flame hole forming member 1 in a portion that does not burn by rotating the damper 35. It is possible to prevent supply and to improve thermal efficiency.

4, the gas amount adjusting valve 23 is provided downstream of the branch point of the gas supply path 21 in the arrangement shown in FIG. It is provided in the supply path 21,
It is also possible to provide the gas amount control valve 23 in the gas supply path 21 between the branch point of the gas supply path 21 and the arrangement point of the intermittent valve 22, and to provide one gas amount control valve 23. It is.

[Another Embodiment] Another embodiment of the first and second embodiments will be described below. (1) In the first and second embodiments, the flame hole forming member 1
Is formed in a rectangular shape when viewed in the flame forming direction. For example, the shape of the flame hole forming member 1 may be circular or elliptical in the flame forming direction. In this case, Is
The mixture flow channel 7 is configured to be bent along the radial direction of the flame hole forming member 1.

(2) In the first embodiment, the communication portion 6 is disposed at a position corresponding to the center of the combustion portion 2 when viewed from the flame forming direction, and the air-fuel mixture passage 7 includes a pair of bent path portions 7b. The communication portion 6 is disposed at a position one side from a position corresponding to the center of the combustion portion 2 when viewed in the flame forming direction, and the mixture flow path 7 is formed by one bent path portion 7b. It is also possible to implement the method by bending the bent path portion 7b a plurality of times along the surface direction of the flame hole forming member 1. Regarding the location of the communication portion 6 and the configuration of the mixture flow path 7, Various modifications are possible.

(3) In the second embodiment, the receiving room 5
However, the receiving chamber 5 is divided into three chamber portions as shown in FIG. 6 or formed as shown in FIG. 7, for example, as shown in FIG. The receiving chamber 5 can be divided into four chamber parts and implemented, and the number of the chamber parts can be variously changed. In addition, in the second embodiment, the chamber part in the receiving chamber 5 is divided in a state where the chamber part is arranged in the longitudinal direction of the flat mixing portion F in the flame forming direction, As shown in FIG. 8, it is possible to form a plurality of chamber sections in a state of being arranged in a direction along the short side of the mixing section F. The dampers 35 shown in FIGS. 6 to 8 show a state in which the mixture flow path 7 is open.

Hereinafter, each of the illustrated components will be described. In FIG. 6, two partition plates 34 are provided along the short side of the flat mixing section F at intervals in the longitudinal direction of the mixing section F, and the receiving chamber 5 is arranged such that the receiving chamber 5 is viewed from the flame forming direction. The first receiving room 5A, the second receiving room 5B, and the third receiving room 5C are sequentially formed into three chamber portions in order from the side close to the introduction port 11 in a state of being arranged in the longitudinal direction. And the communication part 6 and the air-fuel mixture flow path 7 are also provided corresponding to the number of the chamber portions of the receiving chamber 5, and three each of the first to third communication parts 5A to 5C and the first to third air-fuel mixture flow paths 7A to 7C. , A damper 35 is provided in each of the second gas mixture flow path 7B and the third gas mixture flow path 7C. Although not shown, the gaseous header N is provided in the gas mixture passage 7 in the same manner as in the second embodiment.
A gas supply pipe 13 for ejecting fuel is provided in each of A to 7C, and a gas supply path 21 for supplying fuel gas to the gas header N is branched and connected corresponding to the three gas supply pipes 13. Also on the downstream side, there is provided an electromagnetic shut-off valve 36 for interrupting the supply of fuel gas to the gas supply pipe 13 of the second and third mixture flow paths 7B and 7C.

By controlling the opening / closing of the damper 35 and the shut-off valve 36, the state of burning on the entire surface of the flame hole forming member 1 and the first receiving chamber 5A and the second receiving chamber 5B are seen in the flame forming direction. The combustion state can be adjusted in three stages between a state in which the combustion is performed by the flame hole forming member 1 in the portion to be burned and a state in which the combustion is performed by the flame hole forming member 1 in the portion corresponding to the first receiving chamber 5A.

FIG. 7 shows a flat mixing section F.
Are provided at intervals in the longitudinal direction of the mixing section F, and the receiving chambers 5 are close to the inlet 11 in a state where they are arranged in the longitudinal direction of the mixing section F when viewed in the flame forming direction. The first receiving room 5A, the second receiving room 5B, the third receiving room 5C, and the fourth receiving room 5D are formed in order from the side into four chamber portions. And the communication part 6 and the air-fuel mixture flow path 7 also correspond to the number of chamber parts of the receiving chamber 5, and the first to fourth communication parts 6A to 6A
D, four of each of the first to fourth mixture paths 7A to 7D are provided, and dampers 35 are provided in each of the second mixture path 7B, the third mixture path 7C, and the fourth mixture path 7D. I have. Although not shown, the gaseous header N has a mixture gas flow path 7A to 7D as in the second embodiment.
Are provided with gas supply pipes 13 for ejecting fuel, and gas supply paths 21 for supplying fuel gas to the gas header N are branched and connected to the four gas supply pipes 13, respectively.
On the downstream side of the branch point, the second to fourth mixture flow paths 7
An electromagnetic shutoff valve 36 for intermittently supplying fuel gas to the gas supply pipes 13 of B, 7C, and 7D is provided.

By controlling the opening and closing of the damper 35 and the shut-off valve 36, the state of burning on the entire surface of the flame hole forming member 1 and the first receiving chamber 5A,
The state where the flame is formed in the flame hole forming member 1 corresponding to the second receiving chamber 5B and the third receiving chamber 5C, and the flame hole forming member 1 corresponding to the first receiving chamber 5A and the second receiving chamber 5B. The combustion state can be adjusted in four stages to a state in which combustion occurs and a state in which combustion occurs in the flame hole forming member 1 in a portion corresponding to the first receiving chamber 5A.

In FIG. 8, in the flame formation direction, a partition plate 34 is provided at a position corresponding to the center in the direction along the short side of the mixing portion F along the longitudinal direction of the flat mixing portion F. The receiving chamber 5 is formed so as to be divided into two chamber parts of a first receiving chamber 5A and a second receiving chamber 5B in a state of being arranged in a direction along the short side of the mixing section F. The other configuration is the same as in the second embodiment, and a description thereof will not be repeated.

By the way, the second embodiment and FIGS.
In another embodiment shown in FIG. 8, dampers 35 are provided in all of the plurality of mixture paths 7, and shut-off valves 36 for shutting off the supply of fuel gas corresponding to all of the gas supply pipes 13 of the plurality of mixture paths 7. By controlling the opening and closing of the damper 35 and the shut-off valve 36, the portion to be burned out of the flame hole forming member 1 can be appropriately changed in the flame forming direction.

(4) In the first embodiment, a rotary damper 37 (a damper indicated by a dotted line in FIG. 2) as a curved road opening / closing means for opening or closing any one of the pair of curved road portions 7b by a rotation operation. It is also possible to provide and implement. Note that the dam bar 37 shown in FIG. 2 shows a state in which the curved road portion 7b is open. In addition, the second
In the embodiment, it is also possible to implement such that the combustion air is always supplied to each of the plurality of air-fuel mixture channels 7 without providing the damper 35, or the partition plate 3
In the flame formation direction, the receiving chamber 5 is communicated over the entirety, and the mixture is supplied to the entire receiving chamber 5 from the plurality of mixture paths 7 through the plurality of communicating portions 6 without providing the 4. It is also possible.

(5) In the first and second embodiments, the mixing promoting section 10 is provided in each of the pair of curved road portions 7b or the plurality of mixture paths 7;
For the configuration of 0, various changes are possible, for example,
When viewed in the flame formation direction, the shielding member that shields one end portion or the other end portion of the bent path portion 7b or the air-fuel mixture channel 7 in the width direction of the mixture becomes staggered in the flow direction of the air-fuel mixture. It is also possible to carry out the invention by providing a plurality of such members at intervals. Further, the mixing promoting section 10 may not be provided.

(6) In the first and second embodiments, the inlet in each of the pair of bent path portions 7b or the plurality of mixture paths 7 is formed as one inlet 11, but the pair of bent portions is used. It is also possible to form the inlets in the passage portion 7b or in each of the plurality of air-fuel mixture flow paths 7 separately.

(7) In the first and second embodiments, the dispersion member 9 is provided in the receiving chamber 5, but the dispersion member 9 may not be provided.

(8) In the first and second embodiments, an example is shown in which the combustion device according to the present invention is applied to a hot water supply device. However, the combustion device can be applied to other devices such as a heating device.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of a hot water supply device according to a first embodiment.

FIG. 2 is a cross-sectional top view of a main part of the water heater in the first embodiment.

FIG. 3 is a longitudinal sectional front view of a main part of the hot water supply device in the first embodiment.

FIG. 4 is a cross-sectional top view of a main part of a hot water supply device according to a second embodiment.

FIG. 5 is a longitudinal sectional front view of a main part of a hot water supply device according to a second embodiment.

FIG. 6 is a cross-sectional top view of a main part of a hot water supply device according to another embodiment.

FIG. 7 is a cross-sectional top view of a main part of a hot water supply device according to another embodiment.

FIG. 8 is a cross-sectional top view of a main part of a hot water supply device in another embodiment.

FIG. 9 is a longitudinal sectional front view of the combustion device in the improved structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame hole forming member 2 Burning part 3 Flame hole 5 Receiving chamber 6 Communication part 7 Mixture flow path 7b Bent path part 8 Porous member 9 Dispersion member 10 Mixing promotion part 11 Inlet 12 Combustion air supply means 13 Fuel ejection means W Mixture supply means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimichi Ohara 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Tetsuji Morita 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 1-2 F-term in Osaka Gas Co., Ltd. (reference) 3K017 AA07 AB07 AC02 AD03 AD08 AD11 AG03 AG04 CA10 CB08 CE03

Claims (12)

[Claims] 1. A combustion section having a plurality of flame holes formed in a dispersed state and having a plate-like flame hole forming member for holding and burning a flame is provided. A receiving chamber for receiving an air-fuel mixture with combustion air and supplying the mixture to the entirety of the combustion section is provided with the same or substantially the same size as the combustion section in a flame formation direction of the flame burning in the combustion section. A combustion device provided with a mixture supply means for supplying the mixture to the reception chamber, wherein an outlet side end of the combustion chamber communicates with the reception chamber through a communication part at a rear side of the reception chamber. A combustion device configured such that the mixture gas flow path formed is bent along the surface direction of the flame hole forming member, and the mixture gas supply means supplies the mixture gas through the mixture gas flow passage. . 2. The communication portion is provided at a position corresponding to the center of the combustion portion when viewed in the flame formation direction, and the air-fuel mixture flow path is directed to one side from a location where the communication portion is provided. The combustion apparatus according to claim 1, further comprising a pair of bent path portions that extend in a different direction from each other after being extended, and then extend in a direction in which the communication portion exists after the bending. . 3. The air-fuel mixture supply means supplies combustion air through an inlet in each of the pair of curved road portions, and injects fuel into each of the pair of curved road portions. 3. The combustion device according to claim 2, wherein the combustion device includes a fuel ejection unit. 4. The combustion device according to claim 2, wherein the inlet in each of the pair of bent road portions is formed as one inlet. 5. The combustion apparatus according to claim 4, further comprising a curved road portion opening / closing means for opening and closing one of the pair of curved road portions. 6. The communication section, as viewed in the flame formation direction,
Each of the air-fuel mixture flow paths, which are distributed and disposed in each part of the combustion unit, and are separately connected to each of the plurality of communication units, respectively, are extended toward one side from the arrangement position of the communication unit, 2. The device is configured to bend and bend in the direction in which the communication portion exists, and to extend in the direction in which the communication portion exists after the reverse bending.
The combustion device according to claim 1. 7. A mixture air supply unit for supplying combustion air through an inlet in each of the plurality of mixture passages, and a fuel jet to each of the plurality of mixture passages. 7. The combustion apparatus according to claim 6, comprising a fuel ejection means. 8. The combustion apparatus according to claim 6, wherein the inlet in each of the plurality of air-fuel mixture flow paths is formed as one inlet. 9. A part of the plurality of air-fuel mixture flow paths,
9. The combustion device according to claim 8, further comprising a flow passage opening / closing means for opening / closing the mixture flow passage. 10. The receiving chamber is divided into a plurality of chamber portions when viewed in the flame forming direction, and the communication portion is provided corresponding to each of the plurality of chamber portions. 10. The combustion device according to 9. 11. A porous member for dispersing and flowing the air-fuel mixture throughout the flame hole forming member is provided in the combustion section at a position on the back side of the flame hole forming member. The combustion device according to any one of claims 1 to 10, wherein the chamber is provided with a dispersion member that receives the air-fuel mixture flowing from the communication portion and distributes and guides the mixture in the surface direction of the flame hole forming member. 12. The air-fuel mixture flow path according to claim 1, further comprising a mixing promoting portion for disturbing a flow of the air-fuel mixture to promote mixing of the fuel and the combustion air. Item 13. The combustion device according to Item.