JP3916356B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is provided with a combustion part having a plate-like flame hole forming member in which a plurality of flame holes are formed in a dispersed state to hold and burn a flame, and fuel and combustion are provided at the back side of the combustion part. A receiving chamber that receives the air-fuel mixture and supplies it to the entire combustion section is provided with the same or substantially the same size as the combustion section as viewed in the direction of flame formation of the flame that burns in the combustion section. The present invention also relates to a combustion apparatus provided with an air-fuel mixture supply means for supplying the air-fuel mixture to the receiving chamber.
[0002]
[Prior art]
The combustion apparatus as described above is, for example, an all-primary premixing type that burns an air-fuel mixture obtained by mixing fuel gas and combustion air, as disclosed in Japanese Patent Publication No. 5-605. The air-fuel mixture supply means injects fuel into a blower supplying the combustion air by connecting the supply port to the receiving chamber through the communication portion and an air-fuel mixture passage having the outlet side end connected to the suction port of the blower. The fuel injection means is configured, and 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 flows in the casing of the blower. It is supplied to the receiving chamber through the supply port of the blower and burned in the combustion section.
[0003]
[Problems to be solved by the invention]
However, in the combustion apparatus disclosed in the above publication, since the air-fuel mixture flow path communicates with the suction port of the blower, the air-fuel mixture mixed in the air-fuel mixture flow path is caused to flow in the casing of equipment such as a blower. Since the air-fuel mixture is supplied to the receiving chamber, for example, high safety is required for the devices such as making the motor for driving the blower non-sparking, which may increase the cost of the apparatus.
[0004]
In order to eliminate this disadvantage, for example, as shown in FIG. 9, the outlet side end 41 a of the mixture passage 41 is communicated with the receiving chamber 42, and the mixture of combustion air and fuel gas is mixed through the mixture passage 41. An air-fuel mixture supplying means for supplying air to the receiving chamber 42 is provided, whereby the air-fuel mixture mixed in the air-fuel mixture passage 41 is directly supplied to the receiving chamber 42 without flowing in the casing of equipment such as a blower. A structure is conceivable.
[0005]
In addition, a porous punching metal 45 for dispersing and flowing the air-fuel mixture over the entire flame hole forming member 44 is provided at the back side portion of the flame hole forming member 44 in which the flame holes 43 are formed.
Although not shown, for example, the air-fuel mixture supply means includes combustion air supply means for supplying combustion air through the inlet of the air-fuel mixture passage 41, and fuel ejection means for injecting fuel into the air-fuel mixture passage 41. It is conceivable that the combustion air blown by the combustion air supply means is pushed and supplied into the air-fuel mixture flow path by the blowing pressure of the combustion air supply means.
[0006]
By the way, in this improved structure, the air-fuel mixture flow path in the air-fuel mixture flow path is formed by bending the air-fuel mixture flow path along the flame forming direction (direction of arrow P in FIG. 9) of the flame combusted in the combustion section. The fuel gas and the combustion air are sufficiently mixed with each other, but in this case, since the mixture flow path is bent along the flame forming direction, the mixture flow path For this reason, the size of the apparatus becomes larger in the flame formation direction, and the apparatus becomes larger in the flame formation direction. For example, it becomes difficult to adapt to a hot water supply apparatus in which the installation space is limited depending on the installation location.
[0007]
The present invention has been made paying attention to this point, and an object of the present invention is to provide a combustion apparatus capable of reducing the cost of the apparatus and miniaturizing the apparatus in the flame forming direction. It is in.
[0008]
[Means for Solving the Problems]
  To achieve this object, according to the first aspect of the present invention, a combustion section comprising a plate-shaped flame hole forming member in which a plurality of flame holes are formed in a dispersed state to hold and burn the flame. And a receiving chamber for receiving an air-fuel mixture of fuel and combustion air and supplying it to the whole of the combustion section at a location on the back side of the combustion section, as viewed in the direction of flame formation of the flame combusted in the combustion section. A combustion apparatus provided with an air-fuel mixture supplying means that is provided in the same or substantially the same size as the combustion section and supplies the air-fuel mixture to the receiving chamber;
  In the back side portion of the receiving chamber, an air-fuel mixture passage having an outlet side end communicated with the receiving chamber through a communicating portion is formed in a bent shape along the surface direction of the flame hole forming member, and the air-fuel mixture Supply means is configured to supply the air-fuel mixture through the air-fuel mixture flow path.,
In the flame formation direction view, the communication portion is disposed at a location corresponding to the center of the combustion portion, and the air-fuel mixture channel extends from the location of the communication portion toward one side. After that, it is configured to include a pair of bent path portions that are bent in different directions and extend in the direction in which the communicating portion exists after the bending.
[0009]
That is, since the mixture flow path in which the outlet side end is communicated with the receiving chamber through the communication portion and the mixture supply means for supplying the mixture through the mixture flow path are provided, the mixture mixed in the mixture flow path is provided. The air can be directly supplied to the receiving chamber without flowing in the casing of the equipment such as a blower, and the equipment is not required to have high safety, and the cost of the apparatus can be reduced. .
In addition, since the air-fuel mixture flow path is formed in a bent shape along the surface direction of the flame hole forming member, the air-fuel mixture flow path is fully utilized by the size in the surface direction of the flame hole forming member at the back side portion of the combustion portion. In the flame formation direction, the space for the mixture flow path is reduced in the flame formation direction while sufficiently achieving the mixing of the fuel and the combustion air. It becomes possible to achieve downsizing.
As described above, according to the configuration of the first aspect, the cost of the apparatus is reduced, the apparatus in the flame forming direction is reduced in size, and a good mixing state (good combustion state) is achieved. However, it is possible to provide a combustion apparatus that is easily adapted to a hot water supply apparatus or the like in which an installation space is limited.
[0010]
  or,In view of 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 path portions. It is possible to supply air-fuel mixture from each of the pair of bent path parts to the receiving chamber while supplying the surface of the hole forming member as uniformly as possible, and for high load combustion that requires a large amount of air-fuel mixture. Can be handled accurately.
[0011]
  Claim2According to the invention described above, the air-fuel mixture supply means includes combustion air supply means for supplying combustion air through an inlet in each of the pair of bent path portions, and fuel to each of the pair of bent path portions. And a fuel ejection means for ejecting the fuel.
[0012]
As a configuration of the air-fuel mixture supply means, for example, a fuel nozzle for injecting fuel is provided at the introduction port in each of the pair of bent path portions, and combustion air is supplied into the air-fuel mixture flow path 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 mixture flow path in relation to the fuel pressure, and there is a problem that a large amount of combustion air cannot be supplied. .
[0013]
On the other hand, the air-fuel mixture supplying means supplies combustion air through the inlets in each of the pair of bent path portions, and the fuel jet means for jetting fuel to each of the pair of bent path portions; Therefore, the combustion air blown by the combustion air supply means can be pushed and supplied into the air-fuel mixture flow path by the blowing pressure of the combustion air supply means. It becomes possible to supply combustion air.
[0014]
  Claim3In each of the pair of bent path portions,LeadThe entrance is formed as one inlet,
The air-fuel mixture supply means includes combustion air supply means for supplying combustion air through one inlet in the pair of bent path portions, and fuel jet means for jetting fuel to each of the pair of bent path portions. It is prepared for.
  That is, in the case where the inlets in each of the pair of curved path portions are provided separately, it is necessary to supply the combustion air to the inlets in each of the pair of curved path portions. Although the structure may be complicated, since the introduction port in each of the pair of bending path parts is formed as one introduction port, the mixture supply means feeds each of the pair of bending path parts through one introduction port. Combustion air can be supplied, and the configuration of the air-fuel mixture supply means can be simplified.
[0015]
  Claim4According to the invention described above, the bending path portion opening / closing means for opening / closing one of the pair of bending path portions is provided.
  That is, the claim2and3By closing one of the pair of bent path portions with the bent path portion opening / closing means, the combustion air supply means supplies combustion air only to one bent path portion through one inlet. Therefore, when supplying the same amount of combustion air, it is more preferable to supply the combustion air to each of the pair of bent path portions through one inlet by the combustion air supply means. It becomes possible to increase the flow velocity of the combustion air flowing through the portion.
  Accordingly, even when a small amount of combustion air is supplied, fuel can be ejected to combustion air having a relatively high flow rate, so that fuel can be reliably supplied to and mixed with combustion air. Is possible.
[0016]
  Claim5According to the invention described inA plurality of flame holes are formed in a dispersed state, and a combustion part having a plate-like flame hole forming member that holds and burns a flame is provided, and fuel and combustion air are provided at the back side of the combustion part. A receiving chamber for receiving an air-fuel mixture and supplying it to the entire combustion section is provided in the same or substantially the same size as the combustion section as viewed from the direction of flame formation of a flame combusted in the combustion section. In the combustion apparatus provided with an air-fuel mixture supply means for supplying the air-fuel mixture to
In the back side portion of the receiving chamber, an air-fuel mixture passage having an outlet side end communicated with the receiving chamber through a communicating portion is formed in a bent shape along the surface direction of the flame hole forming member, and the air-fuel mixture A supply means configured to supply the mixture through the mixture flow path;The communication parts are dispersedly arranged in each part of the combustion part as viewed in the flame formation direction, and each of the air-fuel mixture flow paths connected to each of the plurality of communication parts is provided at the place where the communication part is provided. And extending in the direction toward the side of the communication portion and extending in the direction toward the side of the communication portion after the reverse bending.
That is, since the mixture flow path in which the outlet side end is communicated with the receiving chamber through the communication portion and the mixture supply means for supplying the mixture through the mixture flow path are provided, the mixture mixed in the mixture flow path is provided. The air can be directly supplied to the receiving chamber without flowing in the casing of the equipment such as a blower, and the equipment is not required to have high safety, and the cost of the apparatus can be reduced. .
In addition, since the air-fuel mixture flow path is formed in a bent shape along the surface direction of the flame hole forming member, the air-fuel mixture flow path is fully utilized by the size in the surface direction of the flame hole forming member at the back side portion of the combustion portion. In the flame formation direction, the space for the mixture flow path is reduced in the flame formation direction while sufficiently achieving the mixing of the fuel and the combustion air. It becomes possible to achieve downsizing.
As described above, according to the configuration of the fifth aspect, the cost of the apparatus is reduced, the apparatus in the flame forming direction is reduced in size, and a good mixed state (good combustion state) is achieved. However, it is possible to provide a combustion apparatus that is easily adapted to a hot water supply apparatus or the like in which an installation space is limited. In the flame formation direction view, since the communicating portions are dispersedly disposed in the respective portions of the combustion portion, the air-fuel mixture can be supplied to the respective portions of the combustion portion through the plurality of communicating portions. The air-fuel mixture can be supplied uniformly in the surface direction of the forming member.
  orAs seen from the flame formation direction, the communication parts are dispersedly disposed in each part of the combustion part, so that the air-fuel mixture can be supplied to each part of the combustion part through the plurality of communication parts. The air-fuel mixture can be supplied uniformly in the surface direction of the flame forming member.
  In addition, in the flame formation direction view, each of the mixture flow paths connected to each of the plurality of communication portions is inverted and bent in the same direction, so the mixture flow distance in each of the plurality of mixture flow paths is set as much as possible. The length can be increased, and the mixing of fuel and combustion air can be promoted.
  Therefore, the claims5According to the configuration described above, it is possible to promote the mixing of the fuel and the combustion air while supplying the air-fuel mixture uniformly in the surface direction of the flame forming member to the combustion portion.
[0017]
  Claim6According to the invention described above, the mixture supply means includes combustion air supply means for supplying combustion air through an inlet in each of the plurality of mixture flow paths, and fuel to each of the plurality of mixture flow paths. And a fuel ejection means for ejecting the fuel.
  As the configuration of the air-fuel mixture supply means, for example, a fuel nozzle that blows fuel into each inlet of each of the air-fuel mixture passages is provided, and combustion air is supplied into the air-fuel mixture passage by the ejector action of the fuel blow-in However, 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, and there is a problem that a large amount of combustion air cannot be supplied. .
[0018]
On the other hand, the air-fuel mixture supplying means supplies combustion air through the introduction ports in each of the plurality of air-fuel mixture flow paths, and the fuel injection means that injects fuel into each of the plurality of air-fuel mixture flow paths, Therefore, the combustion air blown by the combustion air supply means can be pushed and supplied into the air-fuel mixture flow path by the blowing pressure of the combustion air supply means. It becomes possible to supply combustion air.
[0019]
  Claim7According to the invention described in the above, in each of the plurality of mixture flow paths,LeadThe entrance is formed as one inlet,
The air-fuel mixture supply means includes combustion air supply means for supplying combustion air through one inlet port in the plurality of air-fuel mixture flow paths, and fuel injection means for injecting fuel into each of the air-fuel mixture flow paths. It is prepared for.
  That is, in the case where the introduction ports in each of the plurality of mixture channels are provided separately, it is necessary to supply combustion air to the introduction ports in each of the plurality of mixture channels. Although the configuration may be complicated, since the inlets in each of the plurality of gas mixture channels are formed as one inlet, each of the plurality of gas mixture channels is passed through one inlet by the combustion supply means. Combustion air can be supplied, and the configuration of the air-fuel mixture supply means can be simplified.
[0020]
  Claim8According to the invention described above, the channel opening / closing means for opening and closing the mixture channel is provided in a part of the plurality of mixture channels.
  That is, the claim6and7By closing the part of the plurality of gas mixture channels with the channel opening / closing means, the combustion air supply means uses only one of the inlets to burn only the gas mixture channels. Since air can be supplied, when supplying the same amount of combustion air, rather than supplying combustion air to each of the plurality of gas mixture flow paths through one introduction port in the combustion air supply means, It becomes possible to increase the flow velocity of the combustion air flowing through the air-fuel mixture passage.
  Accordingly, even when a small amount of combustion air is supplied, fuel can be ejected to combustion air having a relatively high flow rate, so that fuel can be reliably supplied to and mixed with combustion air. Is possible.
[0021]
  Claim9According to the invention described above, the receiving chamber is divided into a plurality of chamber portions as viewed in the flame formation direction, and the communication portion is disposed corresponding to each of the plurality of chamber portions. Yes.
  That is, the claim6~8The combustion air is supplied to the combustion air supply means through one inlet port in a state in which a part of the plurality of air-fuel mixture passages is closed by the passage opening and closing means. And the air-fuel mixture can be supplied only to a part of the receiving chamber. Thus, it is possible to perform combustion only in a part of the combustion part, and the minimum combustion amount can be set to a smaller combustion amount.
  In addition, when the combustion air is supplied to the combustion portion of the portion that does not burn, the combustion portion is cooled by the combustion air. Since the air-fuel mixture is closed, the combustion air can be prevented from being supplied to the non-burning portion.
  Therefore, the turndown ratio, which is the ratio between the maximum combustible amount and the minimum combustion amount of the combustion part, can be increased, and combustion air is prevented from being unnecessarily supplied to the non-combusting part. Thus, it is possible to improve the thermal efficiency.
[0022]
  Claim10According to the invention described in (2), the combustion portion is provided with a porous member that is positioned at the back side portion of the flame hole forming member to disperse and flow the air-fuel mixture over the flame hole forming member. The receiving 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.
  That is, the mixture isTobuSince the air-fuel mixture is supplied to the receiving chamber through the flame formation direction, the air-fuel mixture is supplied to the receiving chamber in a state where a large amount of air-fuel mixture flows to the place where the communication portion is disposed, and the amount of the air-fuel mixture supplied is biased. However, the combustion of the combustion part may become unstable, but it is dispersed and guided in the surface direction of the flame hole forming member by the dispersing member, and further, by the porous member. The air-fuel mixture can be supplied to the flame hole forming member in a state of being dispersed and flowed over the entire flame hole forming member, and the air-fuel mixture can be uniformly supplied to the entire flame hole forming member, and combustion It is possible to stabilize the combustion of the part.
[0023]
  Claim11According to the invention described in the item 1, the mixing flow path is provided with a mixing promoting portion that disturbs the flow of the mixed gas and promotes 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 in which the fuel and the combustion air are sufficiently mixed to the flame hole forming member, and to make the combustion in the combustion portion more stable. Is possible.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
The example which applied the combustion apparatus concerning this invention to the hot-water supply apparatus is demonstrated based on drawing.
[First Embodiment]
As shown in FIG. 1, the hot water supply apparatus includes a hot water supply unit K that heats supplied water and supplies hot water to the tap tap 19, a control unit H that controls the operation of the hot water supply unit K, and operation information in the control unit H. Is provided with a remote control operation unit R for instructing.
[0025]
The hot water supply section K is an all-primary mixed gas combustion type combustion section provided with a plate-shaped flame hole forming member 1 in which a plurality of flame holes 3 are formed in a dispersed state and hold the flame and burn downward. 2, a heat exchanger 4 for heating water that is heated by combustion of the combustion section 2 and a main body portion P including an exhaust recovery box 31 that recovers combustion exhaust gas heat-exchanged in the heat exchanger 4 Has been.
Incidentally, the flame hole forming member 1 can be formed in a net shape or can be implemented by combining a block-like body into a plate shape as a whole.
The exhaust collection box T receives and collects condensed water falling from the heat exchanger 4, that is, drain, on the bottom surface of the exhaust collection box T, and condenses it to the outside of the exhaust collection box 31 through the discharge path 32. A water recovery member 33 is provided.
Further, the discharge path 32 is connected to the neutralizer C, and the neutralizer C neutralizes the drain.
Note that the combustion exhaust gas heat-exchanged in the heat exchanger 4 is recovered in the exhaust recovery box 31 and then exhausted to the outside.
[0026]
The heat exchanger 4 exchanges heat between the flue gas of the combustion unit 2 and the supplied water in the main heat exchanger 4a, and heats the water in the main heat exchanger 4a in the latent heat recovery heat exchanger 4b. Heat exchange is performed between the exhaust gas after use and the water before passing through the main heat exchanger 4a in a state accompanied by condensation of moisture in the exhaust gas, and the residual sensible heat and retained latent heat of the exhaust gas are recovered. Is configured to do. In this embodiment, the heat exchanger 4 includes the main heat exchanger 4a and the latent heat recovery heat exchanger 4b. However, the heat exchanger 4 may include only the main heat exchanger 4a.
[0027]
Regarding the structure of the combustion chamber 2 and the receiving chamber 5 and the mixing portion F provided at the backside thereof, a description will be given based on FIG. 2 showing a cross-sectional top view thereof and FIG. 3 showing a longitudinal front view thereof. A receiving chamber 5 that receives an air-fuel mixture of fuel and combustion air and supplies it to the entire combustion unit 2 is located at the back side of the combustion unit 2 in the direction of flame formation of the flame that burns in the combustion unit 2. The same or almost the same size as the combustion part 2 is provided.
In addition, a mixing portion F communicated with the receiving chamber 5 through the communicating portion 6 is the same as or substantially the same size as the combustion portion 2 and the receiving chamber 5 as viewed from the flame formation direction. In the mixing portion F, an air-fuel mixture channel 7 in which the outlet side end portion 7a is communicated with the receiving chamber 5 through the communication portion 6 is formed in a bent shape along the surface direction of the flame hole forming member 1. Is provided.
That is, the combustion part 2, the receiving chamber 5, and the mixing part F provided with the flame hole forming member 1 are provided in a rectangular shape having the same or substantially the same size as viewed in the flame formation direction.
Incidentally, the communication port 6a between the outlet side end portion 7a of the mixture flow path 7 and the communication portion 6 has a lower end side in the flame formation direction as viewed in the surface direction of the flame hole forming member 1, as shown in FIG. A shielding member B for shielding is provided over the entire length of the communication port 6a so that the opening area of the communication port 6a is about 2/3 of the total opening area.
[0028]
The communication portion 6 of the receiving chamber 5 is provided at a location corresponding to the center of the combustion portion 2 in the flame formation direction, and the air-fuel mixture flow path 7 is directed from the location where the communication portion 6 is provided to one side. And a pair of bent path portions 7b that are bent in the directions different from each other and extended in the direction in which the communicating portion 6 exists after the bending.
Each of the pair of bent path portions 7b is provided with a mixing promoting portion 10 that disturbs the flow of the air-fuel mixture and promotes mixing of the combustion air and the fuel gas, and each of the pair of bent path portions 7b. The introduction port is formed as one introduction port 11.
Incidentally, the mixing promoting portion 10 is disposed at the center in the flow path width direction of the curved path portion 7b in the flame forming direction, and the width in the flow path width direction in the curved path section 7b is closer to the upstream side in the flow direction of the air-fuel mixture. It is formed to be narrow.
[0029]
That is, the air-fuel mixture flow path 7 is extended from the introduction port 11 on one lateral side corresponding to one end in the longitudinal direction 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 communicating portion 6 exists and the outlet side end portion 7a is connected to the communicating portion 6. It is comprised so that it may communicate with.
Therefore, the air-fuel mixture of the combustion air and the fuel gas is supplied to the receiving chamber 5 through the communication portion 6 with the flow direction reversed at the other lateral side in the longitudinal direction of the flame hole forming member 1. .
[0030]
The combustion part 2 is provided with a punching metal 8 as a porous member, which is positioned at the back side portion of the flame hole forming member 1 to disperse and flow the air-fuel mixture throughout the flame hole forming member 1. The chamber 5 is provided with a dispersion member 9 that receives the air-fuel mixture flowing from the communication portion 6 and distributes and guides it in the surface direction of the flame hole forming member 1.
That is, the dispersion 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 part 2 in the flame formation direction view. When viewed in the direction of flame formation, it is configured so as to be distributed and guided to the side of the receiving chamber 5. It is made uniform in the surface direction of the member 1.
[0031]
A turbofan 12 as combustion air supply means for supplying combustion air through the introduction port 11 is provided, and a gas supply pipe 13 as fuel injection means for injecting fuel to each of the pair of bent path portions 7b is provided. ing.
That is, the air-fuel mixture supply means W for supplying the air-fuel mixture through the air-fuel mixture flow path 7 includes the turbo fan 12 and the gas supply pipe 13, and the gas header N is provided with the gas supply pipe 13. The fuel gas is ejected to each of the pair of curved path portions 7b through the pipes 13, and the combustion air blown by the turbo fan 12 is pushed into each of the pair of curved path portions 7b by the blowing pressure of the turbo fan 12. It is configured to supply.
[0032]
The gas supply pipes 13 are arranged in each of the pair of bent path portions 7b so as to be located in the center of the bent path portion 7b in the flow path width direction when viewed in the flame formation direction. The gas ejection holes 14 are provided in a distributed manner in the flow path width direction of the curved path portion 7b around the axis L along the flame forming direction in the gas supply pipe 13 in the flame forming direction. It is comprised so that it may eject downstream with respect to the flow direction of combustion air.
[0033]
As described above, there are provided the air-fuel mixture channel 7 in which the outlet side end portion 7a is communicated with the receiving chamber 5 through the communication unit 6, and the air-fuel mixture supplying means W for supplying the air-fuel mixture through the gas mixture channel 7. The air-fuel mixture mixed in the air flow path 7 can be directly supplied to the receiving chamber 5 without flowing in the casing of the equipment, so that high safety is not required for the equipment and the cost of the apparatus is reduced. Can be achieved.
In addition, since the air-fuel mixture flow path 7 includes a pair of bent path portions 7b formed in a bent shape along the surface direction of the flame hole forming member 1, the flame hole forming member at the back side of the combustion section 2 is configured. The mixture flow distance in the mixture flow path 7 can be increased by fully utilizing the size of the surface direction of 1 and the mixture is supplied to the receiving chamber 5 from each of the pair of bent path portions 7b. As a result, the space for the air-fuel mixture flow path 7 can be reduced in the flame formation direction to reduce the size of the apparatus in the flame formation direction, and can cope with high-load combustion.
Incidentally, the length of the mixture flow distance is set to a length that does not cause excessive pressure loss.
[0034]
The heat exchanger 2 is connected to a water inlet 15 for supplying water from, for example, a domestic water supply, and a hot water outlet 16 for discharging hot water after heating. The heat exchanger 4 is connected to the water inlet 15. A water flow rate sensor 17 for detecting the water flow rate to the water inlet and a water inlet temperature thermistor 18 for detecting the temperature of the water supplied through the water inlet channel 15 are provided.
The hot water outlet 16 is provided with a hot water temperature thermistor 20 that detects the temperature of hot water discharged from the hot water tap 19.
[0035]
The gas supply passage 21 for supplying the fuel gas to the gas supply pipe 13 has an electromagnetically operated intermittent valve 22 for intermittently supplying the fuel, and an electromagnetically operated type in which the fuel supply amount (combustion amount of the combustion unit 2) can be changed and adjusted. The gas amount adjusting valve 23 is provided, and an igniter 24 for executing an ignition operation for 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. It has been.
[0036]
The remote control unit R includes an operation switch 26 for instructing start / stop of the operation of the hot water supply unit K, a temperature setting switch 27 capable of changing and setting the target temperature for hot water, and a display unit for displaying the hot water temperature and the target temperature for hot water. 28, an operation lamp 29 for indicating that it is in an operating state, a combustion lamp 30 for indicating that the burner 3 is in a combustion state, and the like.
[0037]
The control unit H is configured to include a microcomputer, and based on the operation command of the remote control operation unit R, starts the combustion of the combustion unit 2 as the water flow to the heat exchanger 4 is started, Control is made to stop the combustion of the combustion section 2 as the water flow to the heat exchanger 4 is stopped, and when water flow to the heat exchanger 4 is detected, the tapping temperature is the target for tapping water. Execute processing to adjust the temperature.
[0038]
That is, after the hot water discharge operation state is set in accordance with the ON operation of the operation switch 26 and the water flow rate detected by the water flow rate sensor 17 with the opening operation of the hot water tap 19 exceeds the set water volume, the turbo fan 12. And the open / close valve 22 is opened to adjust the opening of the gas amount adjusting valve 23 to the ignition gas amount, and the igniter 24 ignites the combustion section 2 and is confirmed by the frame rod 25. .
[0039]
Thereafter, based on the detection information of the incoming water temperature thermistor 18, the outgoing water temperature thermistor 20, the water flow rate sensor 17, and the information on the target temperature for hot water set by the temperature setting switch 27, the hot water temperature is determined as the target for hot water. The amount of combustion in the combustion section necessary for achieving the temperature is obtained by calculation. Then, the gas amount adjusting valve 23 is adjusted and controlled so that the gas amount corresponds to the obtained combustion amount, and the turbo fan 12 is set so that the ventilation amount of the turbo fan 12 is in an appropriate combustion state with respect to the adjusted gas amount. The feedforward control for adjusting and controlling the amount of air flow is executed, and further, the feedback control for finely adjusting the opening of the gas amount adjusting valve 23 is executed so that the detected temperature of the tapping temperature thermistor 20 becomes the target temperature for tapping hot water. .
In this way, the water from the water inlet 15 is heat-exchanged by the heat exchanger 4 and hot water having a target temperature for hot water is discharged from the hot water tap 19.
[0040]
[Second Embodiment]
This 2nd Embodiment shows another embodiment of the structure of the receiving chamber 5, the communication part 6, and the air-fuel | gaseous mixture flow path 7 in the said 1st Embodiment, The structure is demonstrated based on drawing.
In addition, about the structure similar to the said 1st Embodiment, the detailed description is abbreviate | omitted by noting the same code | symbol.
[0041]
As shown in FIGS. 4 and 5, the receiving chamber 5 and the mixing unit F provided at the back side portion of the combustion unit 2 include the flame forming member 1 in the flame formation direction of the flame combusted in the combustion unit 2. It is provided in a flat shape having the same or almost the same size as that of the combustion part 2.
The receiving chamber 5 is provided with a partition plate 34 along the short side of the flat-shaped mixing portion F at a position corresponding to the center in the longitudinal direction of the flat-shaped mixing portion F in the flame forming direction. However, when viewed in the flame formation direction, they are dispersedly arranged in each part of the combustion part 2 and separated into two chamber parts, the first receiving room 5A and the second receiving room 5B, in a state of being arranged in the longitudinal direction of the mixing part F. Yes.
[0042]
The first receiving chamber 5A is provided with a first communicating portion 6A, the second receiving chamber 5B is provided with a second communicating portion 6B, and the communicating portions 6 are provided in the respective chamber portions 5A of the receiving chamber 5. Each of the first communication portion 6A and the second communication portion 6B is disposed at a position corresponding to the center of each chamber portion when viewed in the flame formation direction.
That is, in the flame formation direction view, the first receiving chamber 5A is formed on the side close to the flat inlet port 11 in the longitudinal direction, and the second receiving chamber 5B is formed on the side far from the flat inlet port 11 in the longitudinal direction. Has been.
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 in each chamber portion 5a.
[0043]
As the air-fuel mixture flow path 7 connected to the communication portion 6, a first air-fuel mixture flow path 7A connected to the first communication portion 6A and a second air-fuel mixture flow path 7B connected to the second communication portion 6B are provided.
Then, after each of the air-fuel mixture flow paths 7A and 7B connected to each of the two communication portions 6 extends from the place where the communication portion 6 is disposed toward one side, the existence side of the communication portion 6 is present. It is configured to bend and bend in the direction, and to extend in the direction of the communication portion 6 after the turn and bend.
Each of the air-fuel mixture flow paths 7A and 7B is provided with a mixing promoting portion 10, and an introduction port in each of the two air-fuel mixture flow paths 7 A and 7 B is formed as one introduction port 11.
[0044]
Further, the second mixture channel 7B is provided with a rotary damper 35 as a channel opening / closing means for opening and closing the second mixture channel 7B by rotational operation, and the solid line in FIG. 4 indicates the second mixture channel 7B. 4 indicates a state in which the second air-fuel mixture flow path 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 gas mixture flow path 7B is closed, and the cooling air has a small hole. Will be supplied.
By the way, the damper may use another type of rotary type, and any channel opening / closing means may be used as long as it can open and close the mixture channel.
[0045]
That is, the first mixed gas flow path 7A connected to the first communication part 6A and the second mixed gas flow path 7B connected to the second communication part 6B are horizontally equivalent to one end part in the longitudinal direction of the mixing part F. It extends over the entire length in the longitudinal direction from the side introduction port 11 toward the other lateral side, and the lateral other side is inverted and bent along the surface direction of the flame hole forming member 1, and the inverted bent Further, it is configured to extend in the direction in which the communication portion 6 is present and to communicate the outlet end portion 7 a with the communication portion 6.
Therefore, the air-fuel mixture of combustion air and fuel gas is reversed in the flow direction at one side in the longitudinal direction of the mixing portion F and supplied to each chamber portion of the receiving chamber 5 through the communication portion 6. By rotating the damper 35 to close the second gas mixture flow path 7B, the gas mixture is supplied only to the first receiving chamber 5A through the first communication portion 6A.
[0046]
A turbofan 12 for supplying combustion air through the introduction port 11 is provided, a gas supply pipe 13 for injecting fuel into each of the gas mixture channels 7A and 7B is provided in the gas header N, and fuel gas is supplied to the gas header N The gas supply path 21 to be branched is connected corresponding to the two gas supply pipes 13, and the supply of the fuel gas to the gas supply pipe 13 of the second gas mixture flow path 7B is intermittently connected to the downstream side of the branch point. An electromagnetic shut-off valve 36 is provided.
In other words, by opening and closing the shutoff valve 36, the state is switched between a state in which fuel is ejected into the first mixture flow path 7A and the second mixture flow path 7B, and a state in which fuel is ejected only into the first mixture flow path 7A. I have to.
[0047]
And the control part H is comprised so that operation | movement of the hot-water supply part K may be controlled based on the operation command of the remote control operation part R similarly to the said 1st Embodiment, The combustion calculated | required in the feedforward control When the combustion amount is less than half of the maximum combustible combustion amount of the combustion section 2, the damper 35 is rotated to close the second mixture passage 7B and to the second mixture passage 7B. In the state where the supply of combustion air is blocked and the shutoff valve 36 is closed and the fuel gas supply to the gas supply pipe 13 of the second gas mixture passage 7B is shut off, the gas amount adjusting valve 23 and the turbofan 12 To adjust.
Further, when the determined combustion amount is ½ or more of the maximum combustion amount, the damper 35 is not operated and the second mixture channel 7B is fully opened and the shutoff valve 36 is opened. The gas amount adjusting valve 23 and the turbo fan 12 are adjusted.
[0048]
That is, by controlling the damper 35 and the shutoff valve 36 in accordance with the determined amount of combustion, the state of combustion on the entire surface of the flame hole forming member 1 in the flame formation direction corresponds to the first receiving chamber 5A. The combustion state can be adjusted in two stages to the state in which it is burned by the partial flame hole forming member 1.
Accordingly, the combustion air is applied to the flame hole forming member 1 in the non-burning portion by rotating the damper 35 while increasing the so-called turn-down ratio, which is the ratio between the maximum combustible amount and the minimum combustion amount of the combustion unit 2. It is possible to prevent the supply and improve the thermal efficiency.
[0049]
Further, with respect to the location where the gas amount adjusting valve 23 is disposed, in the case shown in FIG. 4, the gas amount adjusting valve 23 is provided on the downstream side of the branch location of the gas supply path 21, and each of the branched gas supply paths 21 is provided. However, the gas amount adjusting valve 23 is provided in the gas supply passage 21 between the branching location of the gas supply passage 21 and the disposing location of the intermittent valve 22, and one gas amount adjusting valve 23 is provided. It is also possible to implement in this way.
[0050]
[Another embodiment]
Other embodiments in the first and second embodiments are listed below.
(1) In the first and second embodiments, the formation shape of the flame hole forming member 1 is formed in a rectangular shape as viewed from the flame formation direction. For example, the shape of the flame hole formation member 1 is viewed from the flame formation direction. In this case, the air-fuel mixture flow path 7 is bent along the radial direction of the flame hole forming member 1.
[0051]
(2) In the first embodiment, the communication portion 6 is disposed at a location corresponding to the center of the combustion portion 2 as viewed in the flame formation direction, and the air-fuel mixture passage 7 is configured to include a pair of bent passage portions 7b. However, the communication portion 6 is disposed at a location that is closer to one side from the location corresponding to the center of the combustion portion 2 in the flame formation direction view, and the air-fuel mixture flow path 7 is configured by one bent path portion 7b. The bending path portion 7b can be bent a plurality of times along the surface direction of the flame hole forming member 1, and various changes can be made to the location of the communicating portion 6 and the configuration of the mixture flow path 7. Is possible.
[0052]
(3) In the second embodiment, the receiving chamber 5 is divided into two chamber portions as viewed in the flame formation direction. For example, as shown in FIG. 6, the receiving chamber 5 is divided into three chamber portions. The receiving chamber 5 can be divided into four chamber portions as shown in FIG. 7, and various changes can be made in the number of the chamber portions.
Further, as to how to divide the chamber portion in the receiving chamber 5, in the second embodiment, the chamber portion is divided in a state of being aligned in the longitudinal direction of the flat-shaped mixing portion F in the flame formation direction view. As shown in FIG. 8, it is also possible to partition and form a plurality of chamber portions in a state of being aligned in the direction along the short side of the mixing portion F.
The dampers 35 shown in FIGS. 6 to 8 all show a state in which the air-fuel mixture flow path 7 is opened.
[0053]
In the following, explanation will be added for each of the illustrated ones.
In the structure shown in FIG. 6, two partition plates 34 are provided along the short side of the flat-shaped mixing portion F with an interval in the longitudinal direction of the mixing portion F, and the receiving chamber 5 is the mixing portion F in the flame forming direction. The first receiving chamber 5A, the second receiving chamber 5B, and the third receiving chamber 5C are divided into three chamber portions in order from the side close to the introduction port 11 in a state of being aligned in the longitudinal direction.
And the communication part 6 and the air-fuel mixture flow path 7 are also provided in correspondence with the number of chamber portions of the receiving chamber 5, three each of the first to third communication parts 5A to 5C and the first to third gas mixture flow paths 7A to 7C. The damper 35 is provided in each of the second gas mixture channel 7B and the third gas mixture channel 7C.
Although not shown, the gas header N is provided with gas supply pipes 13 for injecting fuel to each of the air-fuel mixture flow paths 7A to 7C, and the fuel gas is supplied to the gas header N, as in the second embodiment. The gas supply path 21 to be branched is connected corresponding to the three gas supply pipes 13, and the downstream side of the branch point is the fuel gas to the gas supply pipes 13 of the second and third mixture flow paths 7B and 7C. An electromagnetic shut-off valve 36 for interrupting supply is provided.
[0054]
Then, by controlling the opening and closing of the damper 35 and the shut-off valve 36, the state of combustion on the entire surface of the flame hole forming member 1 and the portions corresponding to the first receiving chamber 5A and the second receiving chamber 5B in the flame forming direction. The combustion state can be adjusted in three stages: a state in which combustion is performed in the flame hole forming member 1 and a state in which combustion is performed in the flame hole forming member 1 corresponding to the first receiving chamber 5A.
[0055]
In the one shown in FIG. 7, three partition plates 34 are provided along the short side of the flat-shaped mixing portion F at intervals in the longitudinal direction of the mixing portion F, and the receiving chamber 5 is the mixing portion in the flame forming direction view. The first receiving chamber 5A, the second receiving chamber 5B, the third receiving chamber 5C, and the fourth receiving chamber 5D are divided into four chamber portions in order from the side close to the introduction port 11 in a state of being arranged in the longitudinal direction of F. .
And the communication part 6 and the air-fuel mixture flow path 7 are also provided by four each of the 1st-4th communication parts 6A-6D and the 1st-4th gas mixture flow paths 7A-7D corresponding to the number of the chamber parts of the receiving chamber 5. The damper 35 is provided in each of the second gas mixture channel 7B, the third gas mixture channel 7C, and the fourth gas mixture channel 7D.
Although not shown, the gas header N is provided with a gas supply pipe 13 for ejecting fuel to each of the air-fuel mixture passages 7A to 7D, and the fuel gas is supplied to the gas header N, as in the second embodiment. The gas supply path 21 to be branched is connected corresponding to the four gas supply pipes 13, and the fuel to the gas supply pipes 13 of the second to fourth mixed gas flow paths 7B, 7C, 7D is provided downstream of the branch points. An electromagnetic shut-off valve 36 for interrupting gas supply is provided.
[0056]
Then, 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 in the flame formation direction, the first receiving chamber 5A, the second receiving chamber 5B, and the third receiving chamber A state of burning in the flame hole forming member 1 corresponding to 5C, a state of burning in the flame hole forming member 1 corresponding to the first receiving chamber 5A and the second receiving chamber 5B, and the first receiving chamber The combustion state can be adjusted in four stages to the state where the flame hole forming member 1 corresponding to 5A combusts.
[0057]
8, the partition plate 34 along the longitudinal direction of the flat mixing portion F is provided at a position corresponding to the center in the direction along the short side of the mixing portion F in the flame forming direction. Are divided into two chamber portions, 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 portion F.
Since other configurations are the same as those of the second embodiment, description thereof is omitted.
[0058]
Incidentally, in the second embodiment and another embodiment shown in FIGS. 6 to 8, the damper 35 is provided in all of the plurality of gas mixture channels 7, and all the gas supply pipes 13 of the plurality of gas mixture channels 7 are supported. Thus, by providing a shutoff valve 36 for shutting off the supply of fuel gas and controlling the opening and closing of the damper 35 and the shutoff valve 36, the portion of the flame hole forming member 1 to be combusted is appropriately changed in the flame formation direction. Can also be implemented.
[0059]
(4) In the first embodiment, a bent path that opens and closes one of the pair of bent path portions 7b by a rotation operation.portionIt is also possible to implement by providing a rotary damper 37 (damper shown by a dotted line in FIG. 2) as an opening / closing means. 2 shows a state in which the bent path portion 7b is opened.
  Further, in the second embodiment, it is possible to always supply combustion air to each of the plurality of gas mixture flow paths 7 without providing the damper 35, or without providing the partition plate 34. In addition, in the flame formation direction, the receiving chamber 5 can be communicated over the whole, and the mixed gas can be supplied to the entire receiving chamber 5 from the plurality of mixed gas flow paths 7 through the plurality of communicating portions 6. is there.
[0060]
(5) In the first and second embodiments, the mixing promoting portion 10 is provided in each of the pair of bent path portions 7b or the plurality of air-fuel mixture passages 7, but various changes are made to the configuration of the mixing promoting portion 10. For example, when the flame formation direction is viewed, the shielding member that shields one end side portion or the other end side portion in the flow passage width direction of the bent passage portion 7b or the air mixture flow passage 7 covers the shielding portion of the air-fuel mixture. It can also be carried out by providing a plurality at intervals so as to form a staggered pattern in the flow direction.
Moreover, this mixing promotion part 10 does not need to be provided.
[0061]
(6) In the first and second embodiments, the inlets in each of the pair of curved path portions 7b or the plurality of gas mixture channels 7 are formed as one inlet port 11, but the pair of curved path portions 7b Alternatively, it is possible to form the inlets in each of the plurality of gas mixture channels 7 separately.
[0062]
(7) In the first and second embodiments, the dispersion member 9 is provided in the receiving chamber 5. However, the dispersion member 9 may not be provided.
[0063]
(8) In the first and second embodiments, an example in which the combustion device according to the present invention is applied to a hot water supply device is shown, but it can also 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 apparatus according to a first embodiment.
FIG. 2 is a cross-sectional top view of the main part of the water heater in the first embodiment.
FIG. 3 is a longitudinal front view of the main part of the water heater in the first embodiment.
FIG. 4 is a cross-sectional top view of the main part of a hot water supply apparatus according to a second embodiment.
FIG. 5 is a longitudinal front view of a main part of a water heater in the second embodiment.
FIG. 6 is a cross-sectional top view of the main part of a water heater in another embodiment.
FIG. 7 is a cross-sectional top view of the main part of a water heater in another embodiment.
FIG. 8 is a cross-sectional top view of the main part of a hot water supply apparatus according to another embodiment.
FIG. 9 is a longitudinal front view of a combustion apparatus in an improved structure.
[Explanation of symbols]
1 Flame hole forming member
2 Combustion section
3 flame holes
5 reception rooms
6 communication part
7 Mixture flow path
7b Bending road part
8 Porous member
9 Dispersing member
10 Mixing promotion section
11 Introduction port
12 Combustion air supply means
13 Fuel injection means
W Mixture supply means

Claims (11)

A plurality of flame holes are formed in a dispersed state, and provided with a combustion part including a plate-like flame hole forming member that holds and burns a flame,
A receiving chamber that receives an air-fuel mixture of fuel and combustion air and supplies it to the whole of the combustion section at the back side of the combustion section, as viewed in the direction of flame formation of the flame that burns in the combustion section. Provided in the same or almost the same size as the part,
A combustion apparatus provided with a mixture supply means for supplying the mixture to the receiving chamber,
In the backside portion of the receiving chamber, an air-fuel mixture channel whose outlet side end is communicated with the receiving chamber through a communicating portion is configured to be bent along the surface direction of the flame hole forming member,
The mixture supply means is configured to supply the mixture through the mixture flow path ;
In the flame formation direction view, the communication portion is disposed at a location corresponding to the center of the combustion portion,
The air-fuel mixture flow path is extended toward one side from the place where the communication portion is disposed, and then bent in different directions, and after that bending, a pair extending in the direction in which the communication portion exists. Combustion device configured to include a curved path portion . Combustion air supply means for supplying combustion air through an introduction port in each of the pair of curved path portions;
The combustion apparatus according to claim 1, further comprising: a fuel ejection unit that ejects fuel to each of the pair of curved path portions . An introduction port in each of the pair of bent path portions is formed as one introduction port,
The air-fuel mixture supply means includes combustion air supply means for supplying combustion air through one inlet in the pair of bent path portions, and fuel jet means for jetting fuel to each of the pair of bent path portions. The combustion apparatus of Claim 1 comprised . The combustion apparatus according to claim 3 , further comprising a bent path portion opening / closing means that opens and closes one of the pair of bent path portions. A plurality of flame holes are formed in a dispersed state, and provided with a combustion part including a plate-like flame hole forming member that holds and burns a flame,
A receiving chamber that receives an air-fuel mixture of fuel and combustion air and supplies it to the whole of the combustion section at the back side of the combustion section, as viewed in the direction of flame formation of the flame that burns in the combustion section. Provided in the same or almost the same size as the part,
A combustion apparatus provided with a mixture supply means for supplying the mixture to the receiving chamber,
In the backside portion of the receiving chamber, an air-fuel mixture channel whose outlet side end is communicated with the receiving chamber through a communicating portion is configured to be bent along the surface direction of the flame hole forming member,
The mixture supply means is configured to supply the mixture through the mixture flow path;
The communication part is dispersedly arranged in each part of the combustion part in the flame formation direction view,
Each of the air-fuel mixture flow paths connected to each of the plurality of communicating portions is extended toward one side from the location where the communicating portions are disposed, and then inverted and bent in the direction in which the communicating portions exist. And the combustion apparatus comprised so that it may extend in the presence side direction of the said communication part after the inversion bending . Combustion air supply means for supplying combustion air through an inlet in each of the plurality of mixture flow paths;
The combustion apparatus according to claim 5 , further comprising: a fuel jetting unit that jets fuel to each of the plurality of air-fuel mixture flow paths . An inlet in each of the plurality of gas mixture channels is formed as one inlet,
The air-fuel mixture supply means includes combustion air supply means for supplying combustion air through one inlet port in the plurality of air-fuel mixture flow paths, and fuel injection means for injecting fuel into each of the air-fuel mixture flow paths. The combustion apparatus according to claim 5 , wherein the combustion apparatus is provided. The combustion apparatus according to claim 7 , wherein a flow path opening / closing means for opening and closing the mixed gas flow path is provided in a part of the plurality of mixed gas flow paths . The receiving chamber is divided into a plurality of chamber portions in the flame formation direction view,
The combustion apparatus according to claim 8 , wherein the communication portion is disposed corresponding to each of the plurality of chamber portions . The combustion part is provided with a porous member that is positioned at the back side portion of the flame hole forming member, and for dispersing and flowing the air-fuel mixture throughout the flame hole forming member,
The receiving chamber, the combustion according to any one of the communicating portion mixed claim dispersion member is provided with receiving a gas dispersing guided flow in the surface direction of the flame hole forming member 1-9 flowing from apparatus. The combustion according to any one of claims 1 to 10, wherein a mixing promoting portion that disturbs the flow of the air-fuel mixture and promotes mixing of the fuel and the combustion air is provided in the air-fuel mixture flow path. apparatus.

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