JP6497731B2 - Combustion device - Google Patents

Description

  The present invention includes a combustion housing incorporating a burner, and a heat shield plate that covers an inner surface of a portion of the outer wall plate of the combustion housing above the burner and defines an air passage through which cooling air flows between the outer wall plate and the outer wall plate. The present invention relates to a combustion apparatus provided.

  Conventionally, as this type of combustion device, a bent portion that bends toward the outer wall plate is provided at the upper end of the heat shield plate, and cooling air escapes from the air passage between the outer wall plate and the heat shield plate at the bent portion. The thing which formed the pore is known (for example, refer to patent documents 1). In this case, cooling air flows through the air passage over the upper end of the heat shield plate, and the heat resistance of the outer wall plate is ensured.

  By the way, the combustion gas of the burner rises while spreading, and the upper part of the heat shield is exposed to the combustion gas. Therefore, even if the overheating of the outer wall plate can be prevented by flowing cooling air over the upper end of the heat shielding plate in the air passage between the heat shielding plate and the outer wall plate as in the above conventional example, it is exposed to the combustion gas. It is impossible to prevent overheating of the upper part of the heat shield.

JP 2005-69640 A

  In view of the above, the present invention has an object to provide a combustion apparatus that can suppress the overheating of the upper portion of the heat shield plate and improve the heat resistance of the entire combustion housing including the heat shield plate. .

In order to solve the above-described problems, the present invention provides a combustion housing with a built-in burner, and an air passage through which cooling air flows between the outer wall plate covering the inner surface of a portion above the burner of the outer wall plate of the combustion housing. A combustion apparatus comprising a heat shielding plate to be defined, wherein a plurality of burners longitudinally arranged in the front-rear direction are arranged in parallel in the combustion housing, and each of the outer wall plates on the front and rear surfaces of the combustion housing Steps that bend toward the front and rear outer wall plates of the combustion housing are provided at the middle in the vertical direction of the portion located above the burners of the front and rear heat shield plates that cover the inner surface. Ventilation holes for cooling air to be ejected from the air passages are formed in the air passages, and the upper portions of the front and rear heat shield plates above the stepped portions are the front and rear outer wall plates of the combustion housing. inclined in a direction away from the height of the lower end of each heat shield of the front and rear side lower than the upper end of the burner A flange that bends away from the front and rear outer wall plates of the combustion housing is formed at the lower end of each of the heat shield plates, and the front and rear ends of each burner engage with this flange. A notch and an ejection hole through which air is ejected upward are formed .

According to the present invention, the cooling air ejected from the vent hole formed in the step in the middle in the vertical direction of the portion located above the burner of the heat shield plate surely contacts the upper inner surface of the inclined heat shield plate. Flows upward. The air flow forms an air curtain that prevents the combustion gas from touching the upper portion of the heat shield plate. Accordingly, overheating of the upper part of the heat shield plate due to the combustion gas can be suppressed, and the heat resistance of the entire combustion housing including the heat shield plate can be improved.
Further, by the present invention lever, by engaging the end portions of the front and rear of each burner in the notch of the visor portion can position each burner laterally further, the air to be ejected from the ejection holes of the overhang portion It flows upward along the inner surface of the heat shield plate above the flange, and the lower portion of the heat shield plate can be effectively cooled.

The perspective view of the combustion apparatus of embodiment of this invention. Sectional drawing of the combustion apparatus cut | disconnected by the II-II line | wire of FIG. FIG. 3 is a cut side view of the combustion apparatus cut along line III-III in FIG. 2. The perspective view of the heat shield of the front side of the combustion apparatus of an embodiment. The perspective view of the heat shield of the rear side of the combustion apparatus of an embodiment.

  With reference to FIGS. 1 to 3, reference numeral 1 denotes a combustion casing constituting a combustion apparatus including a hot water supply heat source unit. The upper surface of the combustion casing 1 is open, and a hot water supply heat exchanger (not shown) is installed on the combustion casing 1 as an object to be heated. In the combustion housing 1, a partition plate 4 that partitions the space in the combustion housing 1 into a combustion chamber 2 and an air supply chamber 3 below the combustion chamber 2 is provided. In the combustion chamber 2, a plurality of longitudinal burners 5 are arranged in parallel in the front-rear direction having a plurality of flame ports 51 for ejecting air-fuel mixture (mixed gas of fuel gas and primary air) at the upper end. .

  A combustion fan (not shown) is connected to the bottom surface of the air supply chamber 3, and air is supplied from the combustion fan to the air supply chamber 3. A number of distribution holes 41 are formed in the partition plate 4 so that air supplied to the air supply chamber 3 is supplied as secondary air to the combustion chamber 2 through these distribution holes 41.

  Further, an upright plate portion 42 bent upward and an upper plate portion 43 bent forward from the upper end of the upright plate portion 42 to reach the outer wall plate 11 on the front surface of the combustion housing 1 are provided at the front end of the partition plate 4. It has been. A primary air chamber 31 that rises so as to reach the upper plate portion 43 on the front side of the upright plate portion 42 is provided at the front end portion of the air supply chamber 3. In the standing plate portion 42, each inlet 44 is formed so as to face the upstream end of the mixing tube portion 52 below each burner 5, and the front surface of the primary air chamber 31 is closed by the gas manifold 6. The gas manifold 6 is provided with nozzles 61 that face the inlets 44, and fuel gas is supplied from the nozzles 61 to the inlets 44, that is, the burners 5, and from the primary air chamber 31. Air is supplied. A frame rod 7, an ignition electrode 8, and a viewing window 9 are arranged on the outer wall plate 11 on the front surface of the combustion housing 1. In FIG. 1, the gas manifold 6 is omitted.

  Here, the outer wall plate portion above the burner 5 of the combustion housing 1 is strongly heated by the combustion of the burner 5. Therefore, in order to ensure the heat resistance of the combustion housing 1, the inner surface of the upper portion of the outer wall plate 11 on the front surface of the combustion housing 1, the outer wall plate 12 on the rear surface, and the outer wall plate 13 on each of the left and right side surfaces above the upper end of the burner 5 The heat shield plates 14, 15, 16 on the front side, the rear side, and the left and right sides are provided. Then, air rising from the primary air chamber 31 is allowed to flow as cooling air between the front outer wall plate 11 and the front heat shield plate 14 through a through hole 45 formed in the upper plate portion 43 of the partition plate 4. The air passage 14a is defined, and the air rising from the air supply chamber 3 through the distribution hole 41 at the rear of the partition plate 4 is also cooled between the rear outer wall plate 12 and the rear heat shield plate 15. An air passage 15a that flows as working air is defined.

  In addition, the height of the lower end of the heat shield plates 14 and 15 on the front side and the rear side is slightly lower than the upper end of the burner 5, and the lower end of the heat shield plates 14 and 15 is connected to the front and rear outer wall plates 11 and 12. The flanges 141 and 151 are formed so as to be bent in the direction of separation (rear in the front heat shield 14 and forward in the rear heat shield 15). As shown in FIGS. 4 and 5, notches 142 and 152 are formed in the flanges 141 and 151 so that front and rear ends of the upper part of each burner 5 are engaged, and each burner 5 is laterally moved. To be positioned.

  Each of the flange portions 141 and 151 is further formed with ejection holes 145 and 155 through which air is ejected, and the air ejected from the ejection holes 145 and 155 is the heat shield plates 14 and 15 above the flange portions 141 and 151. The heat shield plates 14 and 15 are effectively cooled by this air flow. In addition, the ejection holes 145 and 155 are formed continuously to the notches 142 and 152 on the outer side in the front-rear direction of the flanges 141 and 151, and further on the flange 141 of the heat shield 14 on the front side. A small-diameter second ejection hole 145 ′ is formed between the adjacent notches 142, 142.

  In addition, if a part of the air ejected from the through hole 45 formed in the upper plate portion 43 of the partition plate 4 flows into the combustion chamber 2 part behind the upper plate portion 43, insufficient cooling occurs. Therefore, a drooping plate portion 146 which is positioned between the adjacent burners 5 and 5 and bent downward is formed at the rear end of the flange portion 141 of the front heat shield plate 14. A space between the flange portion 141 and the upper plate portion 43 of the partition plate 4 is partitioned from the combustion chamber 2 by the drooping plate portion 146, and air flows into the space from the primary air chamber 31 through the through holes 45. I am doing so. According to this, the drooping plate portion 146 prevents the air ejected from the through hole 45 from flowing into the portion of the combustion chamber 2 above and behind the upper plate portion 43, thereby eliminating the insufficient cooling.

By the way, the combustion gas of the burner 5 rises while spreading in the front-rear direction, and the combustion gas touches the upper portions of the front and rear heat shield plates 14 and 15 to cause overheating of the upper portions of the heat shield plates 14 and 15. It becomes easy. Therefore, in the present embodiment, a step portion 143 that bends to the front and rear outer wall plates 11 and 12 side at the middle portion of the front and rear heat shield plates 14 and 15 located above the burner 5 in the vertical direction. , 153, and vent holes 144, 154 through which cooling air is ejected from the air passages 14 a, 15 a are formed in the step portions 143, 153. Further, the upper portions of the heat shield plates 14 and 15 above the step portions 143 and 153 are inclined upward in a direction away from the outer wall plates 11 and 12.

  According to this, the cooling air ejected from the vent holes 144 and 154 surely contacts the upper inner surfaces of the inclined heat shield plates 14 and 15 and flows upward. And the air curtain which prevents that combustion gas touches the upper part of the heat shield plates 14 and 15 by this airflow is formed. Therefore, overheating of the upper part of the heat shield plates 14 and 15 due to the combustion gas can be suppressed, and the heat resistance of the entire combustion housing 1 including the heat shield plates 14 and 15 can be improved as much as possible.

  Further, when the upper portions of the heat shield plates 14 and 15 are inclined as described above, the spread of the combustion gas in the front-rear direction is suppressed. For this reason, even if the longitudinal dimension of the body portion of the heat exchanger disposed on the combustion housing 1 is made somewhat smaller than the longitudinal dimension of the combustion housing 1, the contact of the combustion gas to the inner surface of the body portion is suppressed, Does not cause overheating. Therefore, it is possible to reduce the cost by downsizing the heat exchanger.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above-described embodiment, the present invention is applied to a combustion apparatus including a hot water supply heat source unit. However, the present invention can be similarly applied to combustion apparatuses other than the hot water supply heat source apparatus.

DESCRIPTION OF SYMBOLS 1 ... Combustion housing, 11, 12 ... Outer wall board, 14, 15 ... Heat shield board, 14a, 15a ... Air passage, 143, 153 ... Step part, 144, 154 ... Vent hole, 5 ... Burner.

Claims (1)

In the combustion apparatus comprising a combustion housing having a built-in burner, and a heat shield plate defining an air passage for flowing cooling air between the outer wall plate covers the inner surface of the upper portion from the burner of the outer wall plate of the combustion housing In the combustion housing, a plurality of longitudinal burners arranged side by side in the front-rear direction are arranged in parallel ,
The front and rear heat shield plates that cover the inner surfaces of the front and rear outer wall plates of the combustion housing are positioned in the middle in the vertical direction of the portion located above the burner, and the front and rear outer wall plate sides of the combustion housing. A bent step is provided, and a vent hole through which cooling air is ejected from the air passage is formed in the step,
The upper part than the step part of each heat shield plate on the front side and the rear side is inclined upward in a direction away from each outer wall plate on the front surface and the rear surface of the combustion housing ,
The lower end of each of the front and rear heat shields is lower than the upper end of the burner, and the lower end of each of the heat shields has a flange that bends away from the front and rear outer wall plates of the combustion housing. A combustion apparatus characterized in that a notch in which the front and rear ends of each burner are engaged and an ejection hole through which air is ejected upward are formed in the flange .

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