JP2013096606A - Gas detector and combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas detector capable of detecting harmful gas while fully mixing exhaust discharged from a plurality of combustion parts, without increasing exhaust back resistance over and above what is required, and of reducing physical size smaller; and a combustion device including such a gas detector.SOLUTION: A gas detector 8 is disposed between a plurality of combustion parts and exhaust parts, including a gas detection means that detects prescribed gas included in discharged gas exhausted by the combustion parts; wherein a partition wall part 25 is arranged for diverting the direction of exhaust gas flow, which extends from an exhaust introduction region 50 along the partition wall part 25 and forms an exhaust flow path up to an exhaust outlet 26. Then, in the extension on the downstream side of the exhaust flow direction beyond the exhaust outlet 26 of the exhaust flow path, a stirring region 42 is formed to stir exhaust gas of a different flow direction. Furthermore, an opening 30 of a sensor chamber 23 that includes the gas detection means is opened toward the stirring region 42.

Description

  The present invention relates to a gas detection device that detects a gas discharged when incomplete combustion occurs in a combustion unit in a combustion device having a plurality of combustion units equipped with burners. Moreover, it is related with the combustion apparatus provided with such a gas detection apparatus.

  For combustion devices such as water heaters, as a countermeasure against incomplete combustion of the burner, harmful or dangerous gases such as carbon monoxide and unburned fuel gas (so-called raw gas) in combustion exhaust (hereinafter referred to simply as harmful gases). Some of them are equipped with a gas detection device having a sensor (gas detection means) for detecting the above. And in such a combustion apparatus, when the density | concentration of the harmful gas contained in combustion exhaust gas exceeds the preset reference value, it is judged that incomplete combustion has occurred and combustion is stopped. .

  Further, some combustion apparatuses include a plurality of combustion sections that incorporate a burner. For example, a so-called two-can two-water type combustion apparatus has a combustion section provided with a burner of a hot water supply system such as a general hot water supply, and a combustion section provided with a burner of a reheating system such as a reheating bath. The combustion gas discharged from each combustion section is supplied to a separate heat exchanger. That is, it has a structure in which two combustion systems are formed in which a combustion part and a heat exchange part equipped with a fuel exchanger are formed as a set. Then, another heating operation is performed in the two combustion systems, such as heating the hot water supply system in one combustion system and heating the reheating system in the other combustion system. Each heating operation by the two combustion systems may be performed separately, or two heating operations may be performed simultaneously.

  In such a combustion apparatus having a plurality of combustion systems, a plurality of sensors are arranged in each combustion system so that harmful gases can be detected individually for each combustion exhaust flowing through each combustion system. Is desirable. However, when a plurality of sensors are provided, there is a problem that the cost of the combustion apparatus increases.

  Therefore, in order to solve this problem, the conventional combustion apparatus has a configuration in which the combustion exhaust gas flowing through each combustion system is collected in the exhaust collecting chamber and discharged from the exhaust collecting chamber to the exhaust pipe, and a sensor is provided in the exhaust collecting chamber. There is one that employs a gas detection device that arranges and detects harmful gases.

  By the way, in the combustion apparatus having a plurality of combustion systems such as the above-described two-can two-water system, even when only one heating operation is performed, the combustion system for performing the heating operation is used for combustion. The air is supplied not only by a blower but also by a blower to a combustion system that does not perform a heating operation. Specifically, in the case where the heating operation is performed only by the combustion system on one side, if the configuration is such that air is supplied by a blower only to the combustion system performing the heating operation, the heat exchanging unit from the combustion unit in the combustion system performing the heating operation There is a possibility that the combustion gas that has flown into the combustion system flows into a combustion system that does not perform the heating operation. Therefore, even when the heating operation is performed with two combustion systems, or when the heating operation is performed with only one of the combustion systems, air is supplied to both combustion systems. Yes.

  In such a case, combustion exhaust gas generated in the combustion section flows into the exhaust collecting chamber from the combustion system performing the heating operation, and only air flows from the combustion system not performing the heating operation. Therefore, in the exhaust collecting chamber, a place where a lot of combustion exhaust flows and a place where only air flows are formed. For this reason, when a sensor is disposed in the exhaust gas collection chamber to detect harmful gas, there is a problem that the harmful gas contained in the combustion exhaust gas cannot be detected if the sensor is positioned where only air flows.

  Therefore, in order to solve this problem, in the conventional combustion apparatus, an agitation part that swirls and agitate the combustion exhaust gas discharged from each combustion system is formed in the exhaust gas collection chamber, and a sensor is disposed downstream of the agitation part. ing. According to this, since the combustion exhaust discharged from each combustion system is mixed in the agitation section, it is possible to detect harmful gas from the mixed combustion exhaust. Therefore, even if noxious gas is contained in the combustion exhaust discharged from any combustion system, this can be detected. In other words, even if incomplete combustion occurs in any combustion part, it can be reliably detected.

  Here, in order to sufficiently mix the combustion exhaust discharged from each combustion system in the stirring unit, it is necessary to lengthen the exhaust flow path of the combustion exhaust in the stirring unit or to reduce the cross-sectional area of the exhaust flow path There is. For example, Patent Document 1 discloses an incomplete combustion detection device (gas detection device) that mixes combustion exhaust gas by dividing the exhaust collecting chamber into two upper and lower chambers and flowing combustion exhaust gas from the lower chamber to the upper chamber. Yes. The incomplete combustion detection device disclosed in Patent Document 1 has a two-stage structure of a lower chamber in which a wide space for mixing combustion exhaust gas is secured and an upper chamber in which a sensor chamber for arranging sensors is arranged. . And the communication port which continues from the lower chamber to the upper chamber is narrowed. As a result, the combustion exhaust gas flowing in the lower chamber is gradually mixed in the process of flowing from the inlet port toward the upper chamber and passing through the communication port. As a result, the combustion exhaust gas that has reached the upper sensor chamber is in a sufficiently mixed state, so that harmful gases can be detected from the sufficiently mixed gas.

Japanese Patent No. 4071215

  By the way, in recent years, miniaturized combustion apparatuses that do not require a large installation place have been developed. In such a combustion apparatus, since the volume inside the housing is reduced, it is required to reduce the size of each member.

  For this reason, the present inventor does not have a two-stage structure branched into two upper and lower chambers as in the prior art, but the region where the combustion exhaust discharged from a plurality of combustion systems is stirred and the region where the sensor is disposed are substantially the same. Devised to be located at the height of. That is, it was considered that the gas detection device can be reduced in size by reducing the height of the gas detection device as compared with the two-stage structure.

  However, in the structure of the conventional gas detection device, if the area where the combustion exhaust is stirred and the area where the sensor is arranged are made the same height, the combustion exhaust is sufficiently stirred until the combustion exhaust reaches the sensor arrangement position. I couldn't. That is, there has been a problem that the length of the exhaust flow path of the combustion exhaust gas becomes short, so that the combustion exhaust gas flows to the position where the sensor is disposed without being sufficiently mixed.

  As a method for solving such a problem, a large number of partition walls are formed in a region where combustion exhaust gas is agitated, and an exhaust passage having a small cross-sectional area extending repeatedly is formed, so that the exhaust passage is elongated. Then, a method of mixing the combustion exhaust can be considered. However, according to the structure in which the exhaust flow path is elongated, the exhaust resistance is increased, which may adversely affect the combustion operation of the burner.

  In view of the above-described problems of the prior art, the present invention can detect harmful gases in a state where exhaust gases discharged from a plurality of combustion sections are sufficiently mixed without increasing the exhaust resistance more than necessary. Thus, it is an object of the present invention to provide a gas detection device that can be miniaturized, and a combustion device including such a gas detection device.

  The invention according to claim 1 for solving the above-mentioned problem is a combustion apparatus having a plurality of combustion sections each provided with a burner for burning fuel, and is disposed between the plurality of combustion sections and the exhaust section. A gas detection device comprising a gas detection means for detecting the presence and / or concentration of a predetermined gas contained in exhaust gas discharged from a gas, wherein the exhaust gas discharged from a plurality of combustion sections is aggregated and aggregated Each of the combustion sections is formed by being surrounded by a plurality of side walls, and an exhaust collection chamber for introducing the exhaust gas into the exhaust section and a sensor chamber in which the gas detection means is disposed. An exhaust introduction region in which the exhaust introduction port is located, and has a partition wall portion that bypasses the flow direction of the exhaust gas, and an exhaust discharge port that communicates the inside of the exhaust collecting chamber and the exhaust portion , The partition wall along the exhaust inlet Provided, the partition wall portion extends from the exhaust introduction region along the partition wall portion, and an exhaust passage having an exhaust exhaust port as a terminal is formed at a position beyond the exhaust passage, A collision wall portion is formed at a position separated from a direction different from the direction from the exhaust discharge port to the outside, and the collision wall portion extends in a direction intersecting the exhaust flow direction at the end of the exhaust flow path. The gas is characterized in that a stirring region in which the exhaust gas is stirred is formed between the exhaust discharge port and the collision wall, and the opening of the sensor chamber is open toward the stirring region. It is a detection device.

In the gas detection device of the present invention, the partition wall portion extends along the exhaust introduction port, and the partition wall portion extends an exhaust flow path from the exhaust introduction region along the partition wall portion to the exhaust discharge port. Is formed. And the collision wall part is formed in the position which separated from the exhaust flow path, and was separated in the direction different from the direction (exhaust discharge direction) which goes outside from an exhaust discharge port. As a result, part of the exhaust gas (hereinafter also referred to as combustion exhaust) reaching the exhaust discharge port is discharged from the exhaust discharge port to the outside, and the other part is not discharged to the outside but to the collision wall. Flowing. And between the exhaust discharge port and the collision wall portion, combustion exhaust flowing from the exhaust discharge port side to the collision wall portion side, flowing from the exhaust discharge port side to the collision wall portion side and colliding with the collision wall portion, An agitation region is formed in which the combustion exhaust gas flowing in the direction away from the collision wall is agitated. Moreover, in the gas detection apparatus of this invention, the opening of a sensor chamber is opening toward this stirring area. That is, in the gas detection device of the present invention, the portion connected to the end of the exhaust flow path formed between the exhaust introduction port and the exhaust discharge port is branched into a portion toward the outside and a stirring region side, An agitation region in which combustion exhaust gas is mixed is formed in a portion beyond the exhaust passage and where exhaust flows from the exhaust passage. In other words, the combustion exhaust gas is mixed in a portion located further downstream of the exhaust passage. As a result, the combustion exhaust gas introduced from the plurality of exhaust gas inlets can be sufficiently mixed without increasing the exhaust resistance of the exhaust passage more than necessary.
And in the gas detection apparatus of this invention, since the opening of a sensor chamber is opening toward the stirring area | region, the combustion exhaust gas fully mixed in the stirring area | region can be taken in into a sensor chamber. This makes it possible to detect harmful gases with respect to a sufficiently mixed combustion exhaust.

Further, in the gas detection device of the present invention, a stirring region for mixing the gas is formed in a portion beyond the exhaust passage and in a portion where the exhaust flows from the exhaust passage. For this reason, even if the exhaust gas flowing through the exhaust passage flows from any exhaust inlet, it always reaches the stirring region. That is, the exhaust gas introduced from the exhaust introduction port flows through the exhaust passage toward the exhaust discharge port, and therefore, from among the exhaust introduction ports at different positions, the exhaust gas flows from any of the exhaust introduction ports. However, the exhaust gas surely reaches the stirring zone.
Here, as described above, combustion exhaust gas flows from the combustion system that performs the heating operation, and only air flows from the combustion system that does not perform the heating operation. In some cases, a place where a large amount of air flows and a place where only air flows are formed.
However, in the gas detection device of the present invention, all the exhaust gases that have flowed in from all the exhaust inlets gather, and the exhaust gas that has passed through the agitated stirring area flows into the sensor chamber. The means does not perform the detection operation only on the combustion exhaust, or does not perform the detection operation only on the air. This makes it possible to reliably detect the harmful gas even when the harmful gas is contained in the combustion exhaust gas introduced from any exhaust inlet.

  Furthermore, in the gas detection device of the present invention, a stirring area is formed between the exhaust outlet and the collision wall. Thereby, in the agitation region, the combustion exhaust gas flowing from the exhaust discharge port side to the collision wall portion side and the combustion exhaust gas whose direction of flow is changed by colliding with the collision wall portion are mixed. In this way, according to the configuration in which the combustion exhausts having different flows are mixed and stirred and mixed, the combustion exhaust in a narrow range is mixed as compared with the configuration in which the combustion exhaust is mixed by passing through the elongated exhaust passage. This makes it possible to reduce the size of the gas detection device. Further, as compared with a configuration in which combustion exhaust gas is mixed by passing through an elongated exhaust passage, it is not necessary to provide a partition wall or the like of the passage that extends while being bent, and the structure of the gas detection device can be simplified.

  According to a second aspect of the present invention, the exhaust introduction region is formed on a bottom surface side of the exhaust collecting chamber, and the two exhaust introduction ports are positioned in parallel in the exhaust introduction region, and the partition wall The portion extends along one of the exhaust introduction ports, and the exhaust gas introduced from the one exhaust introduction port into the exhaust collecting chamber bypasses the exhaust discharge port along the partition wall portion, The gas detection device according to claim 1, wherein the gas detection device flows toward the exhaust inlet side of the gas.

  In the gas detection device of the present invention, the two exhaust introduction ports are arranged in parallel, and the partition wall portion extends along one exhaust introduction port. The exhaust gas introduced into the exhaust collecting chamber from one exhaust introduction port bypasses the exhaust discharge port along the partition wall portion and flows to the other exhaust introduction port side. As a result, the combustion exhaust gas that has flowed from different exhaust gas inlets on the upstream side of the exhaust flow path can be merged. That is, when the combustion exhaust gas flows through the exhaust gas flow path, the distance that flows in the merged state can be lengthened, so that the combustion exhaust gas flowing from different exhaust gas inlets can be mixed more reliably.

  According to a third aspect of the present invention, the plurality of side wall portions include a pair of opposing side wall portions, and an exhaust introduction region is formed in the vicinity of one side wall portion of the pair of side wall portions, The gas detection device according to claim 1, wherein the sensor chamber is provided in the vicinity of the side wall of the gas sensor.

  In the gas detection device of the present invention, a long distance can be placed between the exhaust introduction region and the sensor chamber. That is, since the exhaust flow path positioned between the exhaust introduction region and the sensor chamber can be made longer, the combustion exhaust gas flowing from different exhaust introduction ports can be mixed more reliably.

  According to a fourth aspect of the present invention, the sensor chamber is in the exhaust collecting chamber and is located at a portion facing the partition wall portion, and the exhaust discharge port is sandwiched between the sensor chamber and the partition wall portion. 4. The gas according to claim 1, wherein a total width of the exhaust discharge port is substantially equal to a distance between the sensor chamber and the partition wall portion. It is a detection device.

  In the gas detection device of the present invention, since the entire width of the exhaust outlet is substantially equal to the distance between the sensor chamber, which is a part of the exhaust passage, and the partition wall portion, the exhaust is exhausted over substantially the entire width of the end portion of the exhaust passage. A discharge port is formed. For this reason, most of the combustion exhaust gas flowing through the exhaust passage can be discharged to the outside from the exhaust discharge port, and unnecessary combustion exhaust does not flow into the stirring region where the exhaust flows from the exhaust passage. In other words, the combustion exhaust more than necessary does not flow into the agitation region, and the exhaust flow of the combustion exhaust that passes through the entire gas detection device is not significantly disturbed, so that the exhaust operation of the combustion exhaust can be stabilized.

  The invention according to claim 5 is characterized in that the opening of the sensor chamber is located between the vicinity of the end of the exhaust passage and the collision wall. This is a gas detection device.

  According to a sixth aspect of the present invention, the inner width of the exhaust outlet, which is the inner width measured in the exhaust flow direction in the exhaust passage through the center of the exhaust outlet, is a reference length. When a position closest to the collision wall portion of the outlet is set as a reference position, a portion separated from the reference position by about one third of the reference length on the upstream side in the exhaust flow direction and the exhaust from the reference position. The opening of the sensor chamber is located in a region formed between the portion separated by about one third of the reference length on the downstream side in the flow direction. The gas detection device according to any one of the above.

  In the gas detection device of the present invention, it is desirable to provide an opening of the sensor chamber at such a position with respect to the stirring region where the combustion exhaust gas is mixed. That is, if the opening of the sensor chamber is too close to the stirring region side, the opening of the sensor chamber may be too close to the collision wall. At this time, the combustion exhaust that collides with the collision wall and changes the direction of the flow direction may flow into the sensor chamber before being stirred with the combustion exhaust flowing in the direction toward the collision wall. On the other hand, if the opening of the sensor chamber is too far from the stirring region, it becomes difficult to flow only the combustion exhaust gas stirred in the stirring region into the sensor chamber. Accordingly, it is desirable that the opening of the sensor chamber is located between the vicinity of the end of the exhaust flow path and the collision wall, and further, the reference position is upstream from the reference position in the exhaust flow direction. In a region formed between a part separated by about one third of the length and a part separated by about one third of the reference length on the downstream side in the exhaust flow direction from the reference position, It is desirable that an opening of the sensor chamber is located.

  According to a seventh aspect of the present invention, the inner width of the exhaust outlet, which is measured in the exhaust flow direction through the center of the exhaust outlet, is defined as a reference length. The distance between the reference position and the collision wall portion is 20% or more of the reference length when the position closest to the collision wall portion of the exit is used as the reference position. 6. The gas detection device according to claim 6.

  According to such a configuration, since the size of the stirring region can be sufficiently increased, sufficient mixing of the combustion exhaust introduced from the plurality of exhaust inlets and intake of the sufficiently mixed combustion exhaust into the sensor chamber can be achieved. Can be implemented more reliably.

  From the above, the gas detection device according to the present invention is arranged between two combustion parts and an exhaust part in a combustion apparatus having two combustion parts equipped with burners for burning fuel, and is discharged from the combustion part. A gas detection device equipped with gas detection means for detecting the presence and / or concentration of a predetermined gas contained in the exhaust gas to be collected, the exhaust gas exhausted from the two combustion sections is aggregated, and the aggregated exhaust An exhaust collecting chamber for introducing gas into the exhaust section; and a sensor chamber in which the gas detection means is arranged. The exhaust collecting chamber includes a top surface portion and four side wall portions suspended from the top surface portion. Surrounded and open on the bottom side, an exhaust introduction region is formed on the bottom side where two exhaust introduction ports for introducing exhaust from the two combustion parts are arranged in parallel, and the four side walls are opposed to each other. A pair of side walls, and a pair of side walls Among them, an exhaust introduction region is located in the vicinity of one side wall, and the sensor chamber is located in the vicinity of the other side wall, and a partition wall that bypasses the flow direction of exhaust gas, and the internal An exhaust discharge port communicating with the space and the exhaust portion, the partition wall portion is located along one exhaust introduction port, and extends along the parallel direction of the exhaust introduction port, The partition wall portion forms an exhaust passage extending from the exhaust introduction region along the partition wall portion and terminating at the exhaust discharge port, and the sensor chamber is in the exhaust assembly chamber, The exhaust outlet is formed at a position sandwiched between the sensor chamber and the partition wall, and the entire width of the exhaust outlet is between the sensor chamber and the partition wall. It is almost equal to the distance, and exceeded the exhaust flow path And a collision wall portion is formed at a position separated from a direction different from the direction from the exhaust discharge port to the outside, and the collision wall portion intersects the exhaust flow direction at the end of the exhaust flow path. The collision wall portion is formed by at least one side wall portion of the side wall portions, extends in a direction crossing an exhaust flow direction at an end of the exhaust flow path, and the exhaust discharge portion. Between the outlet and the collision wall portion, the exhaust gas flowing from the exhaust discharge port side to the collision wall portion side flows from the exhaust discharge port side to the collision wall portion side and collides with the collision wall portion. An agitation region is formed in which the exhaust gas flowing in a direction away from the exhaust gas is agitated, and is an inner width of the exhaust discharge port, passing through the center of the exhaust discharge port, and a flow direction of the exhaust gas in the exhaust flow path The inner width measured in When the position closest to the collision wall portion of the exhaust outlet is set as the reference position, a portion separated from the reference position by about one third of the reference length on the upstream side in the exhaust flow direction, and the reference An opening of the sensor chamber is located in a region formed between the position and a portion separated by about one third of the reference length on the downstream side in the exhaust flow direction, and the opening of the sensor chamber is It is desirable that the distance between the reference position and the collision wall portion is 20% or more of the reference length.

  The invention according to claim 9 has a plurality of combustion systems including a burner that burns fuel and a heat exchanger that recovers the heat of combustion gas generated by the operation of the burner. A combustion apparatus including any one of the gas detection devices.

  The combustion apparatus of the present invention can be downsized, and even when downsized, the combustion exhaust introduced from a plurality of exhaust inlets is sufficiently mixed without increasing the exhaust resistance of the exhaust passage more than necessary. It has a gas detector that can detect harmful gases. Therefore, the combustion apparatus as a whole can be miniaturized, and even if the combustion apparatus is miniaturized, there is no occurrence of problems such as burner combustion operation due to high exhaust resistance. In addition, because it is possible to detect harmful gases with exhaust gas discharged from multiple combustors well mixed, harmful gases generated due to problems such as incomplete combustion have occurred in any combustion system Even in cases, it can be reliably detected.

Since the gas detection device of the present invention mixes combustion exhaust at a portion beyond the exhaust flow path, combustion introduced from a plurality of exhaust inlets without increasing the exhaust resistance of the exhaust flow path more than necessary. There is an effect that the exhaust can be sufficiently mixed. In addition, since the opening of the sensor chamber opens toward the region where the combustion exhaust gas is mixed, it becomes possible to take in the combustion exhaust gas sufficiently mixed into the sensor chamber, and the exhaust gas discharged from a plurality of combustion portions It is possible to detect harmful gases in a sufficiently mixed state.
Furthermore, since the gas detection device of the present invention agitates and mixes combustion exhaust gases having different flows, the combustion exhaust gas can be mixed in a relatively narrow range, and the gas detection device can be downsized. There is.
Further, the combustion apparatus of the present invention equipped with such a gas detection device can reduce the size of the combustion apparatus as a whole, and even if it is reduced in size, problems such as burner combustion operation due to high exhaust resistance occur. There is an effect of not.
Furthermore, since the combustion apparatus of the present invention can detect harmful gas in a state where exhaust gases discharged from a plurality of combustion sections are sufficiently mixed, harmful gas is generated in any combustion system of the plurality of combustion systems. Even if it is a case, it is effective in detecting it reliably.

It is a block diagram which shows the combustion apparatus which concerns on embodiment of this invention. It is a perspective view which shows the gas detection apparatus which concerns on embodiment of this invention. It is a bottom view of the gas detection apparatus of FIG. It is the partially broken perspective view which looked at the gas detection apparatus of FIG. 2 from another direction, and shows a part of broken part with a dotted line. It is a perspective view which shows the sensor chamber of FIG. 4, (a) shows the state which decomposed | disassembled the inner metal fitting and the outer metal fitting, and (b) shows the state which attached the inner metal fitting and the outer metal fitting integrally. FIG. 3 is a partially broken perspective view of the gas detection device of FIG. 2, and a part of the broken portion is indicated by a dotted line. It is a conceptual diagram which shows the boundary position of the open part and obstruction | occlusion part of the exhaust discharge port of FIG. It is a bottom view of the gas detection apparatus of FIG. 2, and shows the state which permeate | transmitted the partition wall part. It is explanatory drawing which shows the flow direction of the combustion exhaust gas which flowed into the gas detection apparatus of FIG. It is a bottom view of the gas detection apparatus of the form different from FIG. It is a bottom view of the gas detection apparatus of the form different from FIG. It is a bottom view of the gas detection apparatus of a form different from FIG. It is an operation principle figure which shows the combustion apparatus of a form different from FIG. It is an operation | movement principle figure which shows the combustion apparatus of a form different from FIG. In the combustion apparatus which concerns on embodiment of this invention, it is a schematic diagram which shows the flow of the exhaust gas which passes the inside of a gas detection apparatus, when combustion operation is implemented, and shows the state seen from diagonally back. It is a schematic diagram which permeate | transmits and shows the outer wall part of the gas detection apparatus of FIG.

  Prior to the description of the detailed embodiment of the present invention, an embodiment for explaining the outline of the configuration and the general operation and effect will be described.

  The combustion apparatus 300 of this embodiment is a combustion apparatus provided with two combustion parts (not shown) provided with the burner which burns fuel, as FIG.15,16 shows.

  And the combustion apparatus 300 of this embodiment has the gas detection apparatus 301 which collects the exhaust_gas | exhaustion discharged | emitted from two combustion parts. That is, the gas detection device 301 of this embodiment functions as an exhaust collecting pipe.

  The gas detection device 301 is disposed above the two combustion sections and serves as a flow path that collects exhaust gases discharged from the two combustion sections and discharges them to the outside. That is, the combustion apparatus 300 of the present embodiment is disposed between an exhaust unit (not shown), and a sensor (gas detection means) that detects the presence and / or concentration of a predetermined gas contained in the exhaust gas discharged from the combustion unit. ).

  The gas detection device 301 has an exhaust gas collection chamber 302 that collects exhaust gases discharged from two combustion sections and introduces the collected exhaust gas into the exhaust section, and a sensor chamber 303 in which sensors are arranged. doing. The exhaust collecting chamber 302 is a space formed by being surrounded by a top surface portion and four side wall portions.

  A circular exhaust outlet 304 is opened on the top surface of the exhaust collecting chamber 302. The exhaust outlet 304 is a hole that communicates the inside and outside of the exhaust collecting chamber 302. In the present embodiment, the exhaust outlet 304 is opened at a position away from any of the four side walls.

  In addition, the exhaust collecting chamber 302 is open on the bottom side, and two exhaust introduction ports 305 and 306 for introducing exhaust from the two combustion sections are opened in parallel on the bottom side. That is, an exhaust introduction region 307 in which two exhaust introduction ports 305 and 306 are opened in parallel is formed on the bottom surface side of the exhaust collecting chamber 302.

  Of the four side walls described above, paying attention to the pair of opposing side walls that form the long side, the exhaust introduction region 307 described above is located in the vicinity of one side wall, and in the vicinity of the other side wall. Has the sensor chamber 303 described above.

  In the combustion apparatus 300 of the present embodiment, a partition wall portion 308 is provided inside the exhaust collecting chamber 302.

The partition wall 308 forms a flow path that bypasses the flow direction of the exhaust gas. That is, in the present embodiment, the partition wall 308 is provided inside the exhaust collecting chamber 302, and an exhaust passage from the two exhaust introduction ports 305 and 306 to the exhaust discharge port 304 is formed.
Specifically, the partition wall portion 308 has one end portion in the longitudinal direction formed integrally with the side wall portion 310, and is provided over the entire vertical direction. Thus, a part of the exhaust collecting chamber 302 is divided in the front-rear direction into a space 311 on the exhaust introduction region 307 side and a space 312 on the sensor chamber 303 side. The exhaust collecting chamber 302 is continuous in the front-rear direction on the other end side in the longitudinal direction of the partition wall 308.

  The partition wall 308 is located along one exhaust introduction port 305 and extends along the parallel direction of the two exhaust introduction ports 305 and 306.

  In addition, the sensor chamber 303 is in the exhaust collection chamber 302 and at a portion facing the partition wall 308. The exhaust outlet 304 is formed at a position sandwiched between the sensor chamber 303 and the partition wall 308, and the entire width of the exhaust outlet 304 is substantially equal to the distance between the sensor chamber 303 and the partition wall 308. .

  Furthermore, as a configuration unique to the present embodiment, a stirring region 309 is set in a part of the exhaust collecting chamber 302.

  In the present embodiment, the agitation region 309 is provided at a position that extends beyond the exhaust outlet 304 of the exhaust passage and extends downstream in the exhaust flow direction.

  That is, the exhaust collecting chamber 302 has four side walls, but is close to one exhaust introduction port 305 and far from the other exhaust introduction port 306 out of a pair of side walls constituting the short side. When attention is paid to the side wall portion 310 in the position, the exhaust outlet 304 is located away from the side wall portion 310 in the present embodiment.

  In other words, in the present embodiment, the exhaust outlet 304 is open at a position away from any of the four side walls described above, so that there is also a space at a position beyond the exhaust outlet 304 of the exhaust passage. Yes, this space functions as the stirring region 309.

  The side wall portion 310 is located on the back side of the stirring region 309. The side wall portion 310 extends in a direction intersecting with the flow direction of the exhaust gas, and functions as a collision wall portion.

  Note that the sensor chamber 303 is open only on one side and closed on the other side. In the present embodiment, the sensor chamber 303 is open only on the plane facing the collision wall, and the other surfaces are closed. When the position of the opening of the sensor chamber 303 and the exhaust outlet 304 are compared in plan view, the opening position of the sensor chamber 303 is in a region equivalent to the point of the exhaust outlet 304 closest to the collision wall.

  Further, in the combustion apparatus 300 employing the gas detection apparatus 301 of the present invention, the exhaust flow flowing inside the gas detection apparatus 301 when the combustion operation is performed will be described with reference to FIGS. The positional relationship between the top, bottom, left and right will be described based on the normal installation state unless otherwise specified.

  As described above, the combustion apparatus 300 includes two combustion sections. When the combustion operation is performed in each combustion section, the combustion exhaust generated in each combustion section is collected through the exhaust inlets 305 and 306, respectively. Flows into the chamber 302.

  The combustion exhaust gas that has flowed into the exhaust collecting chamber 302 flows from the exhaust inlets 305 and 307 along the partition wall 308 and bypasses the exhaust outlet 304. That is, the air flows around the partition wall 308 from the space 311 on the exhaust introduction region 307 side, and reaches the space 312 on the sensor chamber 303 side.

  At this time, the combustion exhaust gas that has not been discharged from the exhaust discharge port 304 flows from the exhaust discharge port 304 into a stirring region 309 formed downstream in the flow direction of the combustion exhaust gas. In this agitation region, combustion exhaust flowing from the exhaust discharge port 304 side toward the side wall portion 310 side, and combustion exhaust flowing from the side wall portion 310 side toward the exhaust discharge port 304 side by colliding with the side wall portion 310, Are mixed. The mixed combustion exhaust gas flows into the sensor chamber 303 opened toward the stirring region 309.

  Next, an embodiment having a structure closer to the actual use will be described in detail.

  Hereinafter, although the combustion apparatus 1 and the gas detection apparatus 8 concerning embodiment of this invention are demonstrated in detail, this invention is not limited to these examples. In the following description, the vertical and horizontal positional relationship will be described based on the normal installation state unless otherwise specified.

  As shown in FIG. 1, the combustion apparatus 1 includes two independent combustion systems 3 a and 3 b inside the housing 2, and these two combustion systems 3 a and 3 b are respectively connected to separate systems of cans and piping systems. It is a so-called two-can two-water type combustion apparatus that is formed. In addition, the comparatively large combustion system 3a located on the right side is mainly used for a heating operation in general hot water supply. The other combustion system 3b located on the left side is mainly used for reheating a bath or supplying heat to a heat load such as a heating device.

  The combustion systems 3a and 3b include a combustion unit 4, a blower (not shown) that supplies air to the combustion unit 4, a primary heat exchanger 5 that mainly recovers sensible heat, and a secondary that mainly recovers latent heat. Formed by the heat exchanger 6.

  The combustion unit 4 includes a burner that burns fuel such as gas and kerosene, and generates high-temperature combustion gas by burning the fuel.

  The primary heat exchanger 5 is located downstream of the combustion unit 4 in the flow direction of the combustion gas, and the secondary heat exchanger 6 is located further downstream of the primary heat exchanger 5 in the flow direction of the combustion gas. Yes. The primary heat exchanger 5 and the secondary heat exchanger 6 are connected in series.

  Moreover, in the combustion apparatus 1, the gas detection apparatus 8 into which the combustion gas discharged | emitted from each combustion system | strain 3a, 3b is introduce | transduced in the flow direction downstream of each combustion system | strain 3a, 3b is provided. And this gas detection apparatus 8 is connected to the exhaust pipe (exhaust part) which is not shown in figure. At this time, a space communicating from the inside of the combustion unit 4 to the insides of the primary heat exchanger 5, the secondary heat exchanger 6, the gas detection device 8, and the exhaust pipe is formed, and the combustion gas generated in the combustion unit 4 is generated. It can flow.

  Therefore, when this combustion apparatus 1 is operated, the combustion gas generated in the combustion unit 4 flows through the primary heat exchanger 5, the secondary heat exchanger 6, and the gas detection device 8, and reaches the exhaust pipe. And it discharge | releases outside from the exhaust port formed above the exhaust pipe. On the other hand, hot water supplied from the outside or a circulating heat medium flows into the primary heat exchanger 5 through the secondary heat exchanger 6 and is heated. By heating the hot water and heat medium in this way, a general hot water supply operation for supplying hot water to a hot water supply destination such as a currant or a bathtub, an automatic bathing operation for supplying hot water to the bathtub, and supplying heat to the heater Various operations such as a heating operation for heating the heat medium and a bath operation for heating by circulating hot water in the bath are possible.

  Here, the gas detection device 8 which is a characteristic component of the present invention will be described in detail.

  As shown in FIG. 2, the gas detection device 8 includes a top surface portion 14 and four side wall portions 15, 16, 17, and 18 that extend downward from edge portions of the top surface portion 14.

  The top surface portion 14 is slightly inclined from the front to the rear side, and the rear portion is slightly higher than the front portion. Further, the top surface portion 14 has an exhaust tube mounting portion 19 that communicates an internal space (exhaust collecting chamber 22 described later) surrounded by the top surface portion 14 and the four side wall portions 15, 16, 17, and 18 with the outside. Is provided. The exhaust tube mounting portion 19 has a cylindrical outer shape and protrudes upward from the top surface portion 14 in the vertical direction. The inner space (exhaust gas collection chamber 22 described later) communicates with the outside through the inner hole portion.

  The four side walls 15, 16, 17, 18 are roughly formed by a pair of side walls 15, 16 that are opposed in the front-rear direction and a pair of side walls 17, 18 that are opposed in the left-right direction. . And each side wall part 15,16,17,18 is respectively formed in the longitudinal direction both ends, and it continues with two of other adjacent side wall parts 15,16,17,18, and is below the top surface part 14. FIG. The exhaust collecting chamber 22 which is a space to be surrounded is annularly surrounded.

At this time, the inside of the sensor chamber 23 integrally attached to the internal space of the gas detection device 8 (exhaust collecting chamber 22 described later) and the outside of the gas detection device 8 are communicated with the side wall portion 15 located in the front. A sensor mounting hole 20 is provided.
Of the pair of side wall portions 17 and 18 that face each other in the left-right direction, one side wall portion 18 is inclined with respect to the vertical direction and extends obliquely downward from the edge of the top surface portion 14. The other side wall portion 17 (collision wall portion), as will be described in detail later, becomes a collision wall with which the introduced combustion exhaust gas collides when exhaust gas is introduced into the exhaust collecting chamber 22.

Next, the internal structure of the gas detection device 8 will be described.
As shown in FIG. 3, an exhaust gas collection chamber 22 that is surrounded by the top surface portion 14 and the four side wall portions 15, 16, 17, and 18 and that is open at the bottom is disposed inside the gas detection device 8. Is formed.

  The exhaust collecting chamber 22 is a space that has a substantially trapezoidal cross-sectional shape and extends in the front-rear direction, and has a length in the front-rear direction (vertical direction in FIG. 3) shorter than the length in the left-right direction. The exhaust chamber 22 is provided with a sensor chamber 23 and a partition wall 25, and an exhaust outlet 26 is formed on the top surface thereof.

  As shown in FIG. 4, the sensor chamber 23 is a member having a substantially rectangular parallelepiped shape that is integrally attached to the inside of the side wall portion 15 located in the front. More specifically, as shown in FIG. 5, the outer metal fitting 28 and the inner metal fitting 29 are formed.

  As shown in FIG. 5A, the outer metal fitting 28 is formed by bending a metal plate, and includes a fixture body 28a extending in a substantially “U” cross section, and a fixture body 28a. It is formed by a rectangular plate-like closing plate portion 28b provided to close one end side.

  As shown in FIG. 5A, the inner metal fitting 29 is formed by bending a flat metal plate into a substantially “U” shape. That is, the inner metal fitting 29 is formed by a flat top plate portion 29a, a bottom plate portion 29b, and an intermediate plate portion 29c. The top plate portion 29a and the bottom plate portion 29b are in parallel positions, and an intermediate plate portion 29c that intersects perpendicularly connects the top plate portion 29a and the bottom plate portion 29b.

  Then, as shown in FIG. 5B, the sensor chamber 23 is formed by integrally attaching the inner metal fitting 29 in contact with the inner side of the outer metal fitting 28. Specifically, the top plate portion 29a of the inner metal fitting 29 and the upper plate of the fixture main body 28a, the bottom plate portion 29b of the inner metal fitting 29 and the lower plate of the fixture main body 28a, the intermediate plate portion 29c of the inner metal fitting 29 and the closing plate. The outer metal fitting 28 and the inner metal fitting 29 are integrally attached by appropriate means such as spot bonding so that the portions 28b are in close contact with each other. At this time, the width L7 (length in the front-rear direction) of the top plate portion 29a, the bottom plate portion 29b, and the intermediate plate portion 29c of the inner metal fitting 29 is the width of the upper plate, the lower plate, and the blocking plate portion 28b of the fixture main body 28a ( It is longer than the length in the front-rear direction. For this reason, when the outer metal fitting 28 and the inner metal fitting 29 are attached integrally, as shown in FIG. 5B, the end portion in the width direction of the inner metal fitting 29 is from the space formed inside the outer metal fitting 28. It protrudes slightly toward the outside. And the sensor chamber 23 is formed by attaching the part which protruded toward the outer side of the inner metal fitting 29, and the side wall part 15 (refer FIG. 4) by suitable means, such as spot joining.

Thus, by forming the sensor chamber 23, a slight gap formed between the fixture body 28 a and the closing plate portion 28 b of the outer metal fitting 28 is closed by the inner metal fitting 29. Therefore, the sensor chamber 23 of the present embodiment has a structure that can prevent the inflow of combustion exhaust from a portion other than the opening 30 of the sensor chamber 23 without using a caulking material made of silicon or the like.
That is, if a caulking material made of silicon is used to close the gap between the outer metal fittings 28, the caulking material is exposed to high-temperature combustion exhaust gas. As a result, silicon adheres to the sensor in the sensor chamber 23 through combustion exhaust, and the sensor may be deteriorated (so-called silicon poisoning occurs). On the other hand, in this embodiment, since the caulking material made of silicon is not used, such deterioration of the sensor can be prevented.

  As shown in FIG. 3, the partition wall portion 25 is provided in the vicinity of the center in the front-rear direction of the exhaust collection chamber 22, and is provided in a portion slightly rearward (downward in FIG. 3) from the center in the front-rear direction. 22 extends in the left-right direction. More specifically, as shown in FIG. 6, a rectangular flat plate-shaped top plate portion 32 extending along the top surface of the exhaust collecting chamber 22 and one side end portion in the short direction of the top plate portion 32 obliquely downward. And a lower plate portion 34 extending in a substantially horizontal direction from the lower end of the center plate portion 33. That is, the partition wall portion 25 is formed by bending and processing a metal plate, and the top plate is formed by bending the upper end portion and the lower end portion of the center plate portion 33 inclined with respect to the vertical direction. A portion 32 and a lower plate portion 34 are formed. At this time, the top plate portion 32 and the lower plate portion 34 protrude in directions away from each other at the upper and lower ends of the center plate portion 33. That is, the lower plate portion 34 protrudes from the center plate portion 33 toward the front side of the exhaust collecting chamber 22, and the top plate portion 32 protrudes from the center plate portion 33 toward the rear side of the exhaust collecting chamber 22.

  Further, as shown in FIG. 3, one end portion in the left-right direction of the partition wall portion 25 is integrated with one side wall portion 17 of the two side wall portions 17, 18 facing in the left-right direction of the exhaust collecting chamber 22. It has become. The other end of the partition wall 25 in the left-right direction is located near the center of the exhaust collecting chamber 22 in the left-right direction. More specifically, the other end in the left-right direction of the partition wall 25 is located slightly closer to the other side wall 18 than the center in the left-right direction of the exhaust collecting chamber 22. Thus, in the exhaust collecting chamber 22, a portion from one end in the left-right direction to the vicinity of the center portion is divided in the front-rear direction by the partition wall portion 25 to form two regions 36 and 37. In addition, since the center plate part 33 of the partition wall part 25 is inclined with respect to the vertical direction, as shown in FIG. 6, among these areas 36 and 37, the front area 36 located on the front side is The rear region 37 located on the rear side becomes narrower as it approaches the upper side, and becomes narrower as it approaches the upper side.

  As shown in FIGS. 3 and 6, the exhaust outlet 26 is a substantially circular opening that communicates with the inner hole of the exhaust tube mounting portion 19 (see FIG. 2). Here, a part of the exhaust outlet 26 is closed by the top plate part 32 of the partition wall part 25. That is, as shown in FIGS. 6 and 7, the portion located on the rear end side of the exhaust discharge port 26 is closed, and the open portion 26 a where the exhaust discharge port 26 is opened is long in the front-rear direction. The length L2 is about 5/6 of the overall length (diameter length) L1 of the exhaust discharge port 26 in the front-rear direction, and the front-rear direction of the closed portion 26b of the exhaust discharge port 26 closed. This length L3 is about one-sixth of the entire length (diameter length) L1 of the exhaust outlet 26 in the front-rear direction.

  That is, most of the exhaust outlet 26 is open on the front side and partially closed on the rear side. Therefore, as shown in FIG. 6, the exhaust outlet 26 is open only to the front region 36 located on the front side among the regions 36 and 37 partitioned by the partition wall 25, and The rear region 37 located on the side is closed. In other words, the exhaust outlet 26 communicates only with the front region 36 and is separated from the rear region 37. For this reason, the exhaust outlet 26 can allow gas to flow in from the front region 36, and cannot flow in gas from the rear region 37.

  Here, among the regions 36 and 37 divided by the partition wall 25, the front region 36 located on the front side will be described in detail.

  As shown in FIG. 8, the sensor chamber 23 is disposed in the front end region of the front region 36 over the most part in the left-right direction. At this time, the opening 30 of the sensor chamber 23 faces the side wall portion 17 and opens toward the side wall portion 17. The length L4 from the opening 30 of the sensor chamber 23 to the side wall portion 17 is about one fifth of the length in the left-right direction of the front region 36 (the length in the longitudinal direction of the partition wall portion 25) L5. It has become. At this time, the length L4 from the opening 30 of the sensor chamber 23 to the side wall portion 17 is the length of the diameter of the exhaust exhaust port 26 (the inner width of the exhaust exhaust port 26 and the center of the exhaust exhaust port 26). The length in the left-right direction) is about 20% of L1.

  Further, in the front region 36, the exhaust discharge port 26 is located between the sensor chamber 23 and the partition wall portion 25. Specifically, from the rear end portion (lower end portion in FIG. 8) of the sensor chamber 23. An open portion 26 a of the exhaust outlet 26 is located between the front end portion (upper end portion in FIG. 8) of the top plate portion 32 of the partition wall portion 25. At this time, the length L6 from the rear end portion of the sensor chamber 23 to the front end portion of the top plate portion 32 and the length L2 in the front-rear direction of the open portion 26a of the exhaust discharge port 26 are substantially the same length. Yes.

  The length in the left-right direction (length in the longitudinal direction) of the sensor chamber 23 and the length in the left-right direction (length of the diameter) L1 of the exhaust outlet 26 are substantially the same. The opening 30 in the sensor chamber 23 and the one end 39 in the left-right direction of the exhaust outlet 26 have the same position in the left-right direction. That is, the distance L4 from the side wall portion 17 formed integrally with the partition wall portion 25 to the opening 30 of the sensor chamber 23, and the end of the exhaust outlet 26 located at a position close to the side wall portion 17 from the side wall portion 17. The distance L4 to the part 39 is the same. That is, the sensor chamber 23 and the exhaust outlet 26 are juxtaposed in the front-rear direction, the positions of both ends in the left-right direction are substantially the same, and the lengths in the left-right direction are substantially the same.

  Next, the flow of combustion exhaust in the gas detection device 8 when the gas detection device 8 is attached to the combustion device 1 and the combustion operation is performed in the two combustion systems 3 and 3 will be described.

  In the combustion apparatus 1, as shown in FIG. 1, a gas detection device 8 is attached to the upper part of the combustion systems 3 and 3. As described above, when the gas detection device 8 is attached to the combustion device 1, the opened bottom surface portion of the gas detection device 8 is closed by another member. As shown in FIG. 9, exhaust inlets 46 and 47 for introducing combustion exhaust from the combustion systems 3 and 3 are positioned below the exhaust collecting chamber 22 which is an internal space. As a result, the combustion exhaust generated in each combustion system 3, 3 is introduced into the exhaust collecting chamber 22 via separate exhaust inlets 46, 47.

  More specifically, an exhaust introduction region 50 is formed in the vicinity of the rear end (lower side in FIG. 9) of the gas detection device 8, and the exhaust introduction region 50 has two exhaust introduction ports 46. , 47 are arranged in parallel in the left-right direction. The two exhaust inlets 46 and 47 are different in size, and the exhaust inlet 47 connected to the combustion system 3 mainly used for heating operation in general hot water supply is mainly used for bathing and heat load. The opening area is larger than that of the exhaust inlet 46 connected to the combustion system 3 used to supply the heat.

  At this time, the exhaust introduction port 47 having a large opening area is located in the rear region 37 located on the rear side among the two regions 36 and 37 divided in the front-rear direction by the partition wall portion 25. The exhaust introduction port 47 extends along the longitudinal direction (left-right direction) of the partition wall portion 25. At this time, the length of the exhaust introduction port 47 in the longitudinal direction and the length of the partition wall portion 25 in the longitudinal direction are substantially the same. That is, the exhaust introduction port 47 is arranged over substantially the entire left and right direction of the rear region 37.

  As a result, the combustion exhaust gas that has flowed into the exhaust collecting chamber 22 from one exhaust inlet 47 flows along the partition wall portion 25 toward the other exhaust inlet 46. In the relay region 51 located on the front side of the portion where the other exhaust introduction port 46 is located, the vicinity of the other exhaust introduction port 46 such as the upper portion thereof, or the portion where the exhaust introduction port 46 is arranged, The combustion exhaust gas flowing into the exhaust gas collection chamber 22 from the exhaust gas inlet 47 merges with the combustion exhaust gas flowing into the exhaust gas collection chamber 22 from the other exhaust gas introduction port 46.

  Here, the relay region 51 is a space in a position parallel to the front region 36 located on the front side in the left-right direction among the two regions 36 and 37 divided in the front-rear direction by the partition wall 25.

  The combustion exhaust gas flowing into the relay region 51 flows from the relay region 51 side to the front region 36 side.

Here, the front side region 36 is divided into two in the left-right direction. As shown in FIG. 9, the flow channel end region 41 where the sensor chamber 23 and the exhaust outlet 26 are located, the stirring region 42, It is divided into. Specifically, the opening 30 of the sensor chamber 23 and the end 39 in the left-right direction of the exhaust outlet 26 that is close to the side wall 17 provided integrally with the partition wall 25 are provided. It is divided into a channel end region 41 and a stirring region 42 with the connecting straight line 11 as a boundary.
Although not particularly limited, the length L4 in the left-right direction of the stirring region 42 is about one third of the length (diameter length) L1 in the left-right direction of the exhaust outlet 26. .

  Therefore, the combustion exhaust gas flowing from the relay region 51 side to the front region 36 side first flows into the flow path end region 41. Here, a part of the combustion exhaust is discharged to the outside from the exhaust outlet 26. On the other hand, the combustion exhaust gas that has not been discharged to the outside flows into the stirring region 42. And the combustion exhaust gas which flowed into the stirring area 42 collides with the side wall part 17, changes the flow direction, and flows toward the exhaust discharge port 26 side.

  Here, in the agitation region 42, the combustion exhaust gas newly introduced from the exhaust discharge port 26 side flows toward the side wall portion 17 side, and the combustion exhaust that has already collided with the side wall portion 17 (collision wall portion) becomes the exhaust discharge port. It flows toward the 26th side. For this reason, in the agitation region 42, the combustion exhaust gas flowing in approximately opposite directions collides with each other. That is, in the agitation region 42, the combustion exhaust gas flowing in the directions approaching each other collides. Thereby, a turbulent flow is generated in the stirring region 42, and the combustion exhaust gas flowing through the stirring region 42 is sufficiently mixed.

  That is, in the gas detection device 8 of the present embodiment, an exhaust passage that flows in order through the exhaust introduction region 50, the relay region 51, and the passage end region 41 is formed. A stirring region 42 is formed on the downstream side of the exhaust gas flow direction in the exhaust flow path. Therefore, the combustion exhaust gas flowing in from the two exhaust inlets 46 and 47 is gradually mixed in the process of flowing through the exhaust passage, and is not sufficiently mixed in the exhaust passage. Also, the mixing is reliably performed in the stirring region 42 located on the downstream side of the exhaust passage.

  Here, the opening 30 of the sensor chamber 23 is located at a position facing the side wall portion 17 (collision wall portion). Therefore, the opening 30 of the sensor chamber 23 is opened toward the space between the opening 30 and the side wall portion 17, that is, toward the stirring region 42. For this reason, the combustion exhaust gas sufficiently mixed in the stirring region 42 also flows into the sensor chamber 23. Then, by the CO sensor 54 (gas detection means) arranged in the sensor chamber 23, the presence or absence of carbon monoxide in the combustion exhaust or the carbon monoxide in the combustion exhaust is compared with the combustion exhaust flowing into the sensor chamber 23. Concentration detection is performed.

  Next, the detection operation of the presence / absence of carbon monoxide in the combustion exhaust, the concentration of carbon monoxide, etc. will be described.

  In the present embodiment, a so-called contact type sensor is used as the CO sensor 54. This contact-reactive sensor is partly made of a substance that generates heat by reacting with carbon monoxide, and the temperature difference between the part that generates heat when it comes into contact with carbon monoxide and the part that does not generate heat when it comes into contact with carbon monoxide Therefore, it is configured to detect carbon monoxide. For this reason, if a contact-type sensor is disposed in a portion where the exhaust gas exhaust velocity is high, the heat generation temperature changes due to exposure to a strong combustion exhaust flow, and a detection error occurs.

  In order to prevent the occurrence of the detection error as described above, in the gas detection device 8 of the present embodiment, as shown in FIG. 9, the sensor chamber 23 has a structure extending in the left-right direction, and at one end in the left-right direction. An opening 30 is provided, and a CO sensor 54 is arranged in the sensor chamber 23 at a position close to the other end in the left-right direction. That is, the CO sensor 54 is located at a position away from the exhaust flow path (the flow path formed by the exhaust introduction area 50, the relay area 51, the flow path end area 41) and the stirring area 42 where the flow velocity of the combustion exhaust gas is fast. Thus, the CO sensor 54 is configured not to be directly exposed to the combustion exhaust gas in the exhaust passage and the agitation region 42. This enables a highly accurate detection operation.

  That is, the combustion exhaust gas that has flowed into the sensor chamber 23 is not subject to the interference of the combustion exhaust gas that flows through the exhaust passage and the agitation region 42 in the sensor chamber 23, so Becomes slower. For this reason, in the vicinity of the CO sensor 54 at a position away from the opening 30 of the sensor chamber 23, the flow rate of the combustion exhaust gas becomes slow, and the CO sensor 54 is not exposed to a strong exhaust gas flow. Therefore, a detection error of the CO sensor 54 due to exposure to a strong exhaust flow does not occur, and a highly accurate detection operation is possible.

  As described above, in the gas detection device 8 of the present embodiment, it is possible to sufficiently mix the combustion exhaust introduced from the exhaust introduction ports 46 and 47, and the accuracy is high with respect to the sufficiently mixed combustion exhaust. High carbon monoxide detection operation can be performed.

  With the above description, the flow of the combustion exhaust gas in the gas detection device 8 when the gas detection device 8 is attached to the combustion device 1 and the combustion operation is performed in the two combustion systems 3 and 3 and the monoxide in the combustion exhaust gas is oxidized. The description of the detection operation of the presence / absence of carbon, the concentration of carbon monoxide, and the like ends.

  In the above-described embodiment, as shown in FIG. 2, the sensor mounting hole 20 is provided in the side wall portion 15, and the CO sensor 54 from the outside of the gas detection device 8 to the internal sensor chamber 23 (see FIG. 3). Placement and removal are possible. Therefore, it is not necessary to remove the gas detection device 8 from the combustion device 1 for attaching and detaching the CO sensor 54, and the CO sensor 54 can be easily attached and detached.

  In the above-described embodiment, an example in which the contact-type CO sensor 54 is employed as the gas detection unit has been described, but the present invention is not limited to this. For example, as a gas detection means, a sensor that detects the presence or absence of other gases such as methane, propane, and sulfur contained in a mixture of unburned fuel and air (so-called raw gas) or the concentration of other gases May be adopted.

  In the above-described embodiment, an example in which the partition wall portion 25 is provided only on the side of one exhaust introduction port 47 is shown, but the gas detection device of the present invention is not limited to this. A configuration in which a partition wall portion is provided on the side of two or more exhaust introduction ports may be employed. The partition wall portion 25 may be provided so that the upstream side and the downstream side are continuous.

  In the above-described embodiment, as shown in FIG. 8, the length L6 from the sensor chamber 23 to the front end portion of the top plate portion 32 and the exhaust discharge port in the front region 36 divided forward and backward by the partition wall portion 25. The length L2 in the front-rear direction of the open portion 26a of 26 is substantially the same length. In other words, in the channel end region 41 that is the end of the exhaust channel formed by the exhaust introduction region 50, the relay region 51, and the channel end region 41, the length L6 in the width direction of the exhaust channel and the same direction The length L2 of the exhaust outlet 26 is substantially the same. In this way, if the exhaust outlet is formed over substantially the entire width direction at the end of the exhaust passage, the stirring region 42 formed on the downstream side in the exhaust flow direction of the exhaust passage. It is possible to more reliably prevent the inflow of combustion exhaust gas more than necessary. In other words, it is desirable to allow an appropriate amount of combustion exhaust gas to flow into the agitation region 42, so that reliable mixing of the combustion exhaust gas in the agitation region 42 and supply of an appropriate amount of combustion exhaust gas to the sensor chamber 23 can be more reliably performed.

  In the embodiment described above, as shown in FIG. 8, the stirring region 42 is provided outside the exhaust flow channel and further downstream of the flow channel end region 41, which is the end of the exhaust flow channel, in the exhaust flow direction. ing. The combustion exhaust gas that has flowed in from the two exhaust air inlets 46 and 47 flows toward the exhaust gas exhaust port 26 formed in the flow path end region 41, so that the combustion exhaust gas has flowed in from either of the exhaust gas inlet ports 46 and 47. Even in this case, the combustion exhaust gas reliably reaches the stirring region 42 via the flow path end region 41. Since the sensor chamber 23 is open toward the stirring region 42, the harmful gas detection operation can be performed on the combustion exhaust gas that has reached the stirring region 42. That is, even if the combustion exhaust gas flows from any of the exhaust inlets 46, 47, the harmful gas detection operation can always be performed on the inflowing combustion exhaust gas, so that the generated harmful gas can be reliably detected. Become. In other words, since both of the combustion exhaust gases that have flowed in from the two exhaust inlets 46 and 47 flow into the stirring region 42, no detection leakage occurs with respect to any one of the combustion exhaust gases.

  However, the present invention is not limited to this, and the length of the exhaust outlet 26 in the same direction as the length L6 in the width direction of the end portion of the exhaust flow path may be smaller. These magnitude relationships may be changed as appropriate according to changes in the amount of combustion exhaust gas introduced, the size of the gas detection device, and the like. For example, the length of the exhaust outlet in the same direction as the length in the width direction of the end portion of the exhaust flow path may be about one third. In other words, the length of the exhaust outlet is from about one third of the length in the width direction of the end portion of the exhaust flow path to approximately the same length as the length in the width direction of the end portion of the exhaust flow path. It may be an appropriate length between.

  In the above-described embodiment, as shown in FIG. 8, the example in which the opening 30 of the sensor chamber 23 and the left-right direction end portion 39 of the exhaust outlet 26 are the same is shown. Is not limited to this. That is, the opening 30 of the sensor chamber 23 may be a position closer to the side wall portion 17 that is a collision wall portion, or may be a position further away from the side wall portion 17. In other words, the opening 30 of the sensor chamber 23 may be formed closer to the stirring region 42 or may be formed at a position further away from the stirring region 42. For example, the position where the end 39 close to the side wall portion 17 among the ends in the left-right direction of the exhaust outlet 26 intersects with the straight line 11 extending along the front-rear direction is used as the reference position, and the left-right direction of the exhaust outlet 26 is determined. When the length L1 is set as the reference length, the opening 30 of the sensor chamber 23 may be provided at a position approaching the side wall portion 17 by about one third of the reference length L1 from the reference position. Moreover, you may provide in the position away from the side wall part 17 only about 1/3 of the reference length L1 from the reference position. In other words, the opening 30 of the sensor chamber 23 extends from the position close to the side wall portion 17 by about one third of the reference length from the reference position to the side wall portion 17 by about one third of the reference length from the reference position. What is necessary is just to be located in the area | region formed between the positions away from.

  In the above-described embodiment, as shown in FIG. 8, the sensor chamber 23 is formed in the channel end region 41 that is the end of the exhaust channel, and the longitudinal direction of the sensor chamber 23 is the flow of exhaust in the exhaust channel. Although the same example as the direction along the direction is shown, the sensor chamber 23 of the present invention is not limited to this. For example, as shown in FIG. 10, the sensor chamber 101 may extend in a direction (front-rear direction of the gas detection device 100) that is substantially orthogonal to the flow direction of the combustion exhaust gas flowing through the flow path end region 41. Furthermore, as shown in FIG. 11, the direction (in the front-rear direction of the gas detection device 110) substantially orthogonal to the flow direction of the combustion exhaust gas flowing through the flow path end region 41 and the flow direction of the combustion exhaust gas flowing through the flow path end region 41 May be a sensor chamber 111 extending in a direction inclined with respect to those directions (the left-right direction of the gas detection device 110). Furthermore, these sensor chambers 101 and 111 may extend in a direction inclined with respect to the vertical direction of the gas detection devices 100 and 110. Furthermore, as shown in FIG. 12, the gas detection device 120 may be configured such that the sensor chamber 121 is formed integrally with the partition wall portion 122 and includes the sensor chamber 121 extending from the stirring region 42 toward the partition wall portion 122. . In addition, the sensor chamber is not limited to a linearly extending one, and may be configured to bend and extend, for example, in a substantially L shape. Further, the sensor chamber is not limited to the extended shape, and may be a sensor chamber in which a substantially cubic space or a spherical space is formed.

  And according to such a change in the position of the sensor chamber, the position of the opening of the sensor chamber may also be changed as appropriate. That is, as described above, it may be a position facing the side wall part 17, a position orthogonal to the side wall part 17, or a position inclined with respect to the side wall part 17. Still further, at those positions, the position may be a position inclined in the vertical direction of the gas detection device. That is, it is only necessary that at least a part of the opening of the sensor chamber is open with respect to the stirring region.

  In the above-described embodiment, an example of the so-called two-can two-water type combustion apparatus 1 in which each combustion system 3 and 3 is formed by separate cans is shown. However, the combustion apparatus to which the gas detection device of the present invention is attached is described. However, it is not limited to this. For example, as shown in FIG. 13, a so-called one-can two-water combustion apparatus in which two combustion systems are provided in one can and these are divided by a partition plate 201 may be used. Further, as shown in FIG. 14, a combustion apparatus in which two burners are provided in one can, and at least one burner can perform a combustion operation independently. In other words, the combustion apparatus may form two combustion systems in one can by forming two exhaust passages having different flow directions in one can.

  In the above-described embodiment, as shown in FIG. 9, an example of a configuration in which a plurality (two) of exhaust discharge ports are arranged in parallel in the exhaust introduction region 50 of the gas detection device 8 has been shown. The gas detection device and the combustion device of the invention are not limited to this. For example, a configuration in which only one exhaust outlet is located in the exhaust introduction region may be employed. In other words, a configuration may be adopted in which combustion exhaust generated in each of the two combustion systems is introduced into the exhaust collecting chamber 22 from one exhaust discharge port. In other words, the exhaust flow path may be configured so that the combustion exhaust generated in each of the two combustion systems merges at a portion upstream of the entire gas detection device in the flow direction of the combustion exhaust. That is, the exhaust introduction port arranged in the exhaust introduction region may be one or plural.

  In the above-described embodiment, as shown in FIG. 5, the example in which the gap formed between the fixture main body 28a of the outer metal fitting 28 and the closing plate portion 28b is closed by the inner metal fitting 29 is shown. The sensor chamber 23 is not limited to this. The shape of the outer metal fitting of the present invention may be changed as appropriate, as long as it is attached to the side wall, a box-shaped sensor chamber whose five surfaces are closed may be formed. Therefore, according to the change in the shape of the outer metal fitting, the position and shape of the gap for closing the inner metal fitting may be changed as appropriate. That is, when the sensor chamber 23 is formed, it is only necessary that the gap formed in the corner portion of the sensor chamber can be closed with the metal fittings.

1,200,210,300 Combustion device 4 Combustion part 8, 100, 110, 120, 301 Gas detection device 15, 16, 18, 310 Side wall part 17 Side wall part (impact wall part)
22, 302 Exhaust collecting chamber 23, 101, 111, 121, 303 Sensor chamber 25, 122, 308 Partition wall portion 26, 304 Exhaust outlet 30 Open 42, 309 Stirring region 46, 47, 305, 306 Exhaust inlet 50, 307 Exhaust introduction area 54 CO sensor (gas detection means)

Claims (9)

In a combustion apparatus having a plurality of combustion sections equipped with burners for burning fuel, presence / absence of a predetermined gas contained in exhaust gas disposed between the plurality of combustion sections and the exhaust section and discharged from the combustion section, and / or Or a gas detection device comprising gas detection means for detecting the concentration,
An exhaust gas collecting chamber for collecting exhaust gases discharged from a plurality of combustion units, introducing the collected exhaust gas into the exhaust unit, and a sensor chamber in which the gas detection means is disposed;
The exhaust collecting chamber is formed by being surrounded by a plurality of side wall portions, and has an exhaust introduction region in which an exhaust introduction port from each combustion portion is located.
A partition wall that bypasses the flow direction of the exhaust gas, and an exhaust outlet that communicates the interior of the exhaust collecting chamber and the exhaust part,
The partition wall portion extends along the exhaust introduction port, and the partition wall portion extends from the exhaust introduction region along the partition wall portion to form an exhaust flow channel having the exhaust discharge port as a terminal. Yes,
A collision wall portion is formed at a position beyond the exhaust flow path and separated from the exhaust discharge port in a direction different from the direction toward the outside,
The collision wall portion extends in a direction intersecting with the exhaust flow direction at the end of the exhaust flow path,
Between the exhaust outlet and the collision wall portion, a stirring region where the exhaust gas is stirred is formed,
An opening of the sensor chamber is opened toward the stirring region. The exhaust introduction region is formed on the bottom side of the exhaust collecting chamber,
In the exhaust introduction region, the two exhaust introduction ports are located in parallel,
The partition wall portion extends along one of the exhaust introduction ports,
The exhaust gas introduced into the exhaust collecting chamber from the one exhaust introduction port bypasses the exhaust discharge port along the partition wall portion and flows to the other exhaust introduction port side. The gas detection device described. The plurality of side wall portions include a pair of opposing side wall portions,
The exhaust gas introduction region is formed in the vicinity of one side wall portion of the pair of side wall portions, and the sensor chamber is provided in the vicinity of the other side wall portion. Gas detection device. The sensor chamber is in the exhaust collecting chamber and is located at a portion facing the partition wall,
The exhaust outlet is formed at a position sandwiched between the sensor chamber and the partition wall,
4. The gas detection device according to claim 1, wherein a total width of the exhaust outlet is substantially equal to a distance between the sensor chamber and the partition wall. 5.   5. The gas detection device according to claim 1, wherein the opening of the sensor chamber is located between the vicinity of the end of the exhaust flow path and the collision wall portion. 6. The inner width of the exhaust outlet, the inner width measured in the exhaust flow direction in the exhaust passage through the center of the exhaust outlet, and the reference length,
When the position closest to the collision wall of the exhaust outlet is the reference position,
A portion separated from the reference position by about one third of the reference length upstream in the exhaust flow direction, and a third of the reference length downstream from the reference position in the exhaust flow direction. The gas detection device according to claim 1, wherein an opening of the sensor chamber is located in a region formed between the separated portions. The inner width of the exhaust outlet, the inner width measured in the exhaust flow direction in the exhaust passage through the center of the exhaust outlet, and the reference length,
When the position closest to the collision wall of the exhaust outlet is the reference position,
The gas detection device according to any one of claims 1 to 6, wherein a distance between the reference position and the collision wall portion is 20% or more of the reference length. In a combustion apparatus having two combustion sections each having a burner for burning fuel, the presence / absence of a predetermined gas contained in the exhaust gas disposed between the two combustion sections and the exhaust section and discharged from the combustion section, and A gas detection device comprising gas detection means for detecting the concentration,
An exhaust gas collecting chamber for collecting exhaust gases discharged from the two combustion sections, introducing the collected exhaust gas into the exhaust section, and a sensor chamber in which the gas detection means is disposed,
The exhaust collecting chamber is surrounded by a top surface portion and four side wall portions suspended from the top surface portion, the bottom surface side is open, and two exhaust gases for introducing exhaust gases from two combustion portions are respectively introduced to the bottom surface side. An exhaust introduction area where the inlets are located in parallel is formed,
The four side wall portions include a pair of opposing side wall portions, and the exhaust introduction region is located in the vicinity of one side wall portion of the pair of side wall portions, and the sensor chamber is located in the vicinity of the other side wall portion. Is located,
A partition wall that bypasses the flow direction of the exhaust gas, and an exhaust exhaust port that communicates the internal space and the exhaust part,
The partition wall portion is at a position along one exhaust introduction port, and extends along the parallel direction of the exhaust introduction port,
The partition wall portion extends from the exhaust introduction region along the partition wall portion, and forms an exhaust passage having the exhaust exhaust port as a terminal end.
The sensor chamber is in the exhaust collecting chamber and is located at a portion facing the partition wall;
The exhaust discharge port is formed at a position sandwiched between the sensor chamber and the partition wall, and the entire width of the exhaust discharge port is substantially equal to the distance between the sensor chamber and the partition wall,
A collision wall portion is formed at a position beyond the exhaust flow path and separated from the exhaust discharge port in a direction different from the direction toward the outside,
The collision wall portion extends in a direction intersecting with the exhaust flow direction at the end of the exhaust flow path,
The collision wall portion is formed by at least one side wall portion of the side wall portions, and extends in a direction intersecting with the flow direction of the exhaust gas at the end of the exhaust flow path,
Between the exhaust discharge port and the collision wall portion, exhaust gas flowing from the exhaust discharge port side to the collision wall portion side, flowing from the exhaust discharge port side to the collision wall portion side and colliding with the collision wall portion, A stirring region is formed in which exhaust gas flowing in a direction away from the collision wall is stirred,
The inner width of the exhaust discharge port, the inner width measured in the exhaust flow direction in the exhaust passage through the center of the exhaust discharge port is a reference length, and is closest to the collision wall portion of the exhaust discharge port When the position is set as a reference position, a portion separated by about one third of the reference length upstream from the reference position in the exhaust flow direction and the reference position downstream from the reference position in the exhaust flow direction. The opening of the sensor chamber is located in a region formed between the portion separated by about one third of the length, and the opening of the sensor chamber is open toward the stirring region, and the reference position The gas detection device characterized in that the distance between the collision wall portion and the collision wall portion is 20% or more of the reference length.   The gas detection device according to claim 1, comprising a plurality of combustion systems including a burner that burns fuel and a heat exchanger that recovers heat of combustion gas generated by the operation of the burner. Combustion device characterized by that.

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