KR100422863B1 - short air preventing structure of combustion chamber - Google Patents

Abstract

(Problem) As a structure for preventing short circuit air in the combustion chamber, it is possible to reliably prevent short circuit air in the combustion chamber without using heat-resistant packing.

(Solution means) Continuously across the rear wall 10B of the side plate 1a of the burner case 1 and the R portion 10 which is a boundary between the side walls 10R, 10L formed at both ends of the rear wall 10B. Thus, the protrusion part 3 which protrudes inside the burner case 1 is formed, and it arrange | positions so that the circumferential end 230 of the injection plate 23 may abut on the base end part 30 of this protrusion part 3. Thereby, the airtightness between the dispersion plate 23 and the side plate 1a is ensured, and generation | occurrence | production of the short circuit air to the combustion chamber C side can be prevented.

Description

Short air preventing structure of combustion chamber

The present invention divides the burner case into a combustion chamber in which the burner is accommodated by a dispersion plate and a vacant chamber in which combustion air is supplied, wherein the combustion air supply in the vacancy constitutes the burner case; The short circuit air prevention structure of a combustion chamber for preventing the short circuit air which leaks from the dispersion plate to the combustion chamber side.

For example, as shown in FIG. 6, the hot water heater arrange | positions the tubular body in which the heat exchanger (not shown) was built in the upper part of the burner case 1 which accommodated the burner, and said burner ( The hot water in the heat exchanger is heated by the high temperature combustion gas A3 to use the hot water for hot water supply and heating. 6, the code P is a spark plug for igniting a burner.

As shown in FIG. 7, the burner case 1 is attached to a substantially U-shaped side plate 1a constituting the back wall 10B and the side walls 10R and 10L and the front side of the side plate 1a. Dispersion plate 23 having a front plate 1b and a bottom plate 1c attached to the bottom surface of the side plate 1a and having a plurality of perforations 231 are disposed in the burner case 1, and the upper side thereof is disposed. It is divided into the combustion chamber C which accommodates a burner, and the empty chamber 12 which the combustion air supply A is supplied from the air supply fan F to the lower side. In addition, a bead 300 protruding inward is formed in the rear wall 10B of the side plate 1a to prevent the heat deformation and to determine the position of the dispersion plate 23. .

The dispersion plate 23 is a combustion air supply A supplied from the air supply opening 11 of the bottom plate 1c into the vacancy 12 by the air supply fan F by referring to FIG. 6. The primary air A1 supplied to the nozzle hole N1 side of the gas supply pipe N disposed in the front chamber 13, and the flame hole portion # 1 of the burner disposed in the combustion chamber C. It distributes to the secondary chamber A2 supplied with the. At the same time, the dispersion plate 23 keeps the supply ratio of the primary air A1 and the secondary air A2 constant and passes the secondary air 231 to burn the secondary air A2. It is distributed uniformly throughout the flame hole part # 1. In this way, the dispersion plate 23 realizes complete combustion of the gas by the burner.

However, when the combustion air A does not pass through the dispersion plate 23 and there is more short-circuit air leaking out between the gaps between the dispersion plate 23 and the side plate 1a, the primary air A1 becomes less. The NO _{x value} in the combustion gas increases. On the rear side of the vacancy 12, the reaction lamp acts as a laminar flow and the combustion air A flows because the primary air A1 is introduced into the front vacancy 13. Therefore, short-circuit air tends to be generated between the back wall 10B and the dispersion plate 23 of the side plate 1a. In particular, in the R part 10 which is the boundary between the back wall 10B and the side walls 10R, 10L of the side plate 1a, it is difficult to ensure the airtightness with the dispersion plate 23, The occurrence of short circuit air tends to increase.

Therefore, conventionally, as shown in FIG. 7, the heat-resistant packing which reaches the R part 10 which is both ends in the inner surface of the back wall 10B of the side plate 1a is attached, and by this heat-resistant packing The airtightness between the dispersion plate 23 and the side plate 1a is ensured to prevent the occurrence of the short circuit air.

However, in the above conventional configuration, not only the attaching operation of the heat-resistant packing is necessary, but also in order to reliably attach the heat-resistant packing, the side plate 1a is press-molded and cleaned and completely degreased ( 탈) This degreasing work is indispensable because it needs to be done. Therefore, the labor time for attaching the heat-resistant packing increases, and the number of parts of the portion corresponding to the heat-resistant packing increases, resulting in high cost.

In addition, the bead 300 is formed on the rear wall 10B of the side plate 1a, which is to prevent the thermal deformation of the side plate 1a and to determine the position of the dispersion plate 23 as described above. It is not formed based on the idea of preventing the occurrence of short circuit air. Thus, the bead 300 does not make a significant contribution to the blocking of the short circuit air.

This invention is made | formed in view of the said situation, and makes it a subject to make it possible to reliably prevent the short circuit air in a combustion chamber C, without using the said heat-resistant packing.

1 is a partially cutaway side view showing a schematic configuration of a hot water heater employing a short circuit air prevention structure of a combustion chamber according to an embodiment of the present invention.

2 is an exploded perspective view showing the configuration of the burner case;

Fig. 3 is a top view showing an approximately U-shaped side plate constituting the burner case.

4 is a side view showing an approximately U-shaped side plate constituting the burner case;

Fig. 5 is a top view showing the burner case and the burner assembled to this.

6 is a partially cutaway side view showing a schematic configuration of a conventional water heater.

7 is an exploded perspective view showing the configuration of a conventional burner case;

Explanation of symbols on the main parts of the drawings

1-Burner Case 1a-Shroud

1b-front plate 1c-bottom plate

3-protrusion 10-R part

10B-Back Wall 10R, 10L-Side Wall

11-opening for air supply 12-vacancy

13-Front Vacancy 23-Dispersion Plate

30-proximal end of protrusion 31-straight part

32-corner portion 230-circumferential end of the dispersion plate

231-Perforation A-Combustion Air Supply

A1-Primary Air A2-Secondary Air

A3-Combustion gas C-Combustion chamber

Ｂ-Burner Ｂ1-Flame Hole

Ｆ-Air supply fan Ｋ-Tube

ｂ-Burner Group

MEANS TO SOLVE THE PROBLEM The means which this invention devised in order to solve the said subject is as follows.

(1) The short circuit air prevention structure of the combustion chamber according to the present invention has a distribution plate partitioned into a combustion chamber in which a burner is accommodated in a burner case and a vacant chamber supplied with combustion air supply, and the combustion air supply in the vacancy constitutes a burner case. As a structure to prevent the short-circuit air leaks from the gap between the approximately U-shaped side plate and the distribution plate to the combustion chamber side,

A projection projecting continuously into the burner case over an R portion which is a boundary between the rear wall of the side plate and the side walls formed at both ends of the rear wall, and the dispersing plate is formed at the base end of the projection; It is arrange | positioned so that it may contact.

According to the said structure, even if a part of the combustion air supply in a vacancy flows into a laminar flow to the back wall side of a side plate, the airtightness between the dispersion plate and the side plate of the back wall of a side plate and the R part of the both ends by the said projection part will flow. Since it is ensured, generation | occurrence | production of the short circuit air to the combustion chamber side can be prevented.

And since the said projection part is formed continuously also in the said R part which is hard to ensure airtightness, the airtightness between the dispersion plate and the side plate in the said R part can be ensured. Thereby, generation | occurrence | production of the short circuit air in the said R part which is most likely to generate short circuit air can be reliably prevented.

Therefore, even if the heat-resistant packing is not attached, the short circuit air in the combustion chamber can be reliably prevented by the protrusion.

In addition, the projecting portion can also exhibit a function of preventing positioning and thermal deformation of the side plate when the dispersion plate is attached to the side plate.

(2) In the short circuit air preventing structure of the combustion chamber, the protruding portion may be disposed on the vacancy side.

According to this, since the combustion air which flows in laminar flow collides with the said protrusion part, and spreads, the quantity of the combustion air which goes between a side plate and a dispersion plate becomes small, and can prevent generation | occurrence | production of short circuit air more reliably.

(3) In the short circuit air preventing structure of the combustion chamber, the protruding portion may be formed continuously from the R portion to the entire side wall of the side plate.

According to this, since the said protrusion part is arrange | positioned in the whole circumferential edge part of the dispersion plate which contact | abuts a side plate, and can ensure complete airtightness in that part, the short air to the combustion chamber side can be prevented more reliably. Moreover, the function which prevents the thermal deformation of a positioning guide and a side plate at the time of affixing the said dispersion plate to a side plate can also exhibit remarkably.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Below, embodiment of this invention is described, referring drawings.

In this embodiment, the hot water heater which employ | adopted the short circuit air prevention structure of the combustion chamber which concerns on this invention is illustrated. As shown in FIG. 1, this hot water supply machine continuously forms a tubular body incorporating a heat exchanger in the upper portion of the burner case 1 forming the combustion chamber C, and supplies air to the bottom of the burner case 1. The fan (F) is attached.

The tubular body is formed in a tubular shape, the flanges 15, 16 and 17 of the upper end portion of the burner case 1 via a heat-resistant packing in the flange portion of the lower end thereof, and Joined by caulking, screwing, etc., it is connected on the burner case (1). Further, a plurality of bent portions 15a and 16a are formed in the flange portions 15 and 16 at the upper end of the burner case 1 (see FIG. 2), and these bent portions 15a and 16a are formed in the tubular body. Bent so as to enclose the flange portion (1) of the c) so as to strengthen the coupling with the tubular body and secure the airtightness of the coupling portion. The heat exchanger accommodated in the tubular body is a meandering arrangement of endothermic tubes including a plurality of fins (not shown), and the water flowing in the endothermic tubes flows from the combustion chamber (C). It is heated by the combustion gas A3.

As shown in FIG. 2, the burner case 1 includes a substantially U-shaped side plate 1a in which the rear wall 10 'and the left and right side walls 10R and 10L are integrally formed, and the side plate 1a. A front plate 1b attached to the front opening portion and a bottom plate 1c attached to the lower opening portion of the side plate 1a are formed in an angled cylindrical shape having a bottom as a whole.

The side plate 1a is provided with a protrusion 3 which protrudes into the burner case 1 over an R portion which is a boundary between the rear wall 10B and the left and right side walls 10R, 10L at a portion biased to the lower side. do. As shown in FIG.3 and FIG.4, this protrusion part 3 is the straight part 31 in the back wall 10B of the side plate 1a, the back wall 10B, and the side wall 10R of right and left, It consists of the corner part 32 in the R part 10 which is a boundary with 10L. This straight part 31 and the corner part 32 are integrated continuously, and the said protrusion part 3 is formed. The protruding portion 3 has an airtightness between the side plate 1a and the dispersing plate 23 in the portion where the circumferential end 230 of the dispersing plate 23 described later abuts on the proximal end 30. To ensure (see FIGS. 1, 5, etc.). In addition, flange portions 15, 16, 17, and 18 are formed at the upper and lower ends of the side plate 1a, respectively. The side plate 1a of such a shape is manufactured by shape | molding a desired flat plate material by well-known press work. In addition, the flange part 16 of the burner case 1 upper end front side is joined to the side plate 1a by spot welding etc. after press work.

The bottom plate 1c is brought into contact with the flange portion 18 at the lower end of the side plate 1a by the peripheral portion thereof, and is joined by means such as caulking, screwing, welding, and the like. The air supply fan F is connected to the air supply opening 11 formed in ().

The front plate 1b is attached to the front opening of the side plate 1a by means of screw fixing, welding, or the like through the heat-resistant packing # 2 so as to ensure the airtightness in the burner case 1.

Moreover, the inside of the burner case 1 is for combustion from the air supply fan F through the combustion chamber C which accommodated the burner in the upper side, and the air supply opening 11 of the bottom plate 1c in the lower side. It is partitioned into the vacancy 12 to which air supply A is supplied, and the vacancy 12 which communicates with the vacancy 12 in the front side, and accommodates the gas supply line N (refer FIG. 1).

As shown in FIG. 5, the burner is formed in a rectangular frame formed by the front plate 21, the rear plate 22, the left and right side plates 24, and the bottom plate (the dispersion plate 23). A burner unit having a plurality of vertically flat burner units (b) having a plurality of flame hole portions (B1) at the top thereof is provided as a burner unit, which is incorporated into a substantially U-shaped side plate (1a) in this burner unit state. . Then, the combustion chamber C and the vacancy chamber 12 are partitioned by the dispersion plate 23 constituting the bottom plate of the burner unit (refer to FIGS. 1, 2, etc.). In addition, a large number of perforations 231 are formed in the dispersion plate 23, and the secondary air A2 passing through the perforations 231 is dispersed to spread the entire flame hole part of the burner. Make sure that it is supplied evenly. In addition, an opening 25 is formed in the front plate of the burner unit to coincide with the primary air mechanism of the burner unit b, and the opening 25 is provided with a plurality of nozzle holes N1 of the gas supply pipe N. Opposite (see FIG. 1).

And in the front plate 1b of the burner case 1, the discharge mechanism part provided with the spark plug P and the electrode plate T is attached to the hole part 19 (refer FIG. 2), and the spark plug The tip portion P1 and the electrode plate tip portion T1 are arranged on the flame hole portion 1 of the burner (see Fig. 1).

When the hot water heater having the above structure is operated, referring to FIG. 1, the combustion air supply A is supplied from the supply fan F to the vacancy 12 in the burner case 1, and a part of the front vacancy 13 is provided. Is supplied as primary air (A1) to the nozzle hole (N1) side of the gas supply pipe (N) of the (), and the other part passes through the plurality of through holes (231) of the distribution plate (23) and the flame hole of the burner. It is supplied to the part # 1 as secondary air A2. At this time, the reaction lamp acts on the primary air A1 being sent to the front chamber 13 so that the combustion air A flows to the rear side of the chamber 12 because of the laminar flow. Short-circuit air leaking to the combustion chamber C side between the back wall 10B or the R portion 10 and the dispersion plate 23 of 1a is likely to occur.

However, the side plate 1a is provided with a protrusion 3 that protrudes into the burner case 1 continuously over the back wall 10B and the R portion 10, and the protrusion 3 The base end 30 is brought into contact with the circumferential end 230 of the dispersion plate 23 to ensure airtightness between the dispersion plate 23 and the side plate 1a in the portion.

Thus, since the airtightness between the dispersion plate 23 and the side plate 1a is ensured by the said projection part 3, even if a part of combustion air supply A flows to the back of the vacancy 12, it will be to the combustion chamber C side. Short circuit air can be prevented. Moreover, the said protrusion part 3 has the said protrusion part 3 continuously formed also in the said R part 10 which is hard to ensure airtightness, and the dispersion plate 23 and the side plate 1a in the said R part 10 are carried out. Since the airtightness is ensured, it is possible to reliably prevent the occurrence of short circuit air in the R portion 10 where short circuit air is most likely to occur. Moreover, since the said projection part 3 is arrange | positioned at the vacancy 12 side, the combustion air supply A which flowed into laminar flow collides with this projection part 3, and it spreads by this, and the side plate 1a ) And the amount of the combustion air supply A directed to the dispersion plate 23 is reduced, which makes it possible to more reliably prevent the occurrence of short circuit air.

Therefore, even if heat-resistant packing is not attached, the short circuit air in the combustion chamber C can be reliably prevented by the protruding portion 3. As a result, the conventional heat-resistant packing becomes unnecessary, and the labor and parts for forming the combustion chamber C can be reduced. In addition, since the short-circuit air is prevented, the degree of dispersion of the secondary air A2 by the dispersion plate 23 becomes more uniform, and the degree of dispersion of the distribution ratio of the primary air A1 to the front chamber 13 is also uniform. This makes it possible to eliminate the burner completely and at the same time achieve low NO _x combustion.

In addition, since the burner is equipped with a rectangular frame body in a large number of burner units b, the total weight is heavy and positioning in the burner case 1 is cumbersome, but the burner is formed on the side plate 1a. The protrusion 3 serves as a positioning guide when attaching the burner unit to facilitate the attachment operation. In addition, the burner case 1 may be thermally deformed due to the thermal shock by burning the burner, but the protrusion 3 also functions as a so-called reinforcing rib, thereby preventing thermal deformation of the side plate 1a. It can also function.

Moreover, the said protrusion part 3 may further be formed continuously from the said R part 10 to the whole side wall 10R, 10L of the side plate 1a. In this case, since the said protrusion part 3 is formed in the whole circumferential end part of the dispersion plate 23 which contact | connects the side plate 1a, and the airtightness in that part is fully ensured, the short circuit air to the combustion chamber C side is further ensured. You can stop it. In addition, the positioning guide when the protrusion 3 attaches the dispersion plate 23 to the side plate 1a and the function of preventing thermal deformation of the side plate 1a can also be more remarkably exhibited.

Moreover, you may provide the said projection part 3 in the combustion chamber C side. In this case, as the holding | maintenance form of the dispersion plate 23, various holding means can be applied, For example, you may provide the holding bead 300 as shown in FIG. 6 at the vacancy 12 side.

Moreover, you may provide the protrusion part 3 also in the said combustion chamber C side, and may arrange | position the dispersion plate 23 between two sets of protrusion parts 3. In this case, since the circumferential end of the dispersion plate 23 is maintained between the valleys between the two sets of protrusions 3, the dispersion plate 23 can be stably arranged and fixed.

Moreover, this invention is not limited only to the hot water heater of the said embodiment, For example, it applies to all the mechanisms provided with the combustion chamber C which accommodated the burner, such as a hot water circulation type heating apparatus and a clothes dryer.

As described above, according to the short circuit air prevention structure of the combustion chamber according to the present invention, it is possible to reliably prevent the short circuit air into the combustion chamber and to eliminate the conventional heat-resistant packing, thereby reducing the number of labor and parts for forming the combustion chamber. can do.

In addition, it is possible to prevent the occurrence of the short circuit air, complete combustion and low NO _X in the combustion burner can be also realized at the same time.

In addition, the protrusions serve as positioning guides to facilitate the arrangement of the dispersion plates and to prevent thermal deformation of the side plates.

Claims (3)

The burner case has a combustion chamber in which the burner is accommodated and a distribution plate partitioning into a vacant chamber for supplying combustion air, wherein the combustion air supply in the vacancy is formed between a gap between the substantially U-shaped side plate constituting the burner case and the distribution plate. As a structure to prevent the short circuit air leaking to the side, A projection projecting continuously into the burner case over an R portion which is a boundary between the rear wall of the side plate and the side wall formed at both ends of the rear wall, and the circumferential end thereof is formed at the base end of the projection. Short-circuit air prevention structure of the combustion chamber, It arrange | positioned so that it may contact. The method according to claim 1, The projecting portion is short circuit air prevention structure of the combustion chamber, characterized in that disposed on the vacant side. The method according to claim 1 or 2, The protruding portion is continuously formed from the R portion over the entire side wall of the side plate, and prevents short circuit air in the combustion chamber.