JPH07190307A - Forcible burner - Google Patents

Abstract

PURPOSE:To facilitate assembling and disassembling of a burner unit, to make dispersion of combustion air uniform and to stabilize a distribution ratio of primary air and secondary air by incorporating a skirt part of a second dispersing plate in a burner box while sliding on a first dispersing plate and bringing a rising piece into contact with a suspended plate. CONSTITUTION:A second dispersing plate 23 is provided at a predetermined interval above a first dispersing plate 12. A skirt part is provided at a peripheral edge of the plate 23. The plate 23 is formed in size judge inserted into a burner box 1 above the first plate. Further, left and right suspended pieces 23a, 23a for forming a skirt part are inserted to a gap between the piece 12a and rightside and leftside walls of the box 1. A forward suspended plate 21a for forming the skirt part is fixedly brought into contact with the piece 12a, and a burner unit is mounted above the plate 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a forced combustion device, in particular
Combustion primary air and secondary air are separately supplied from one air supply fan into two paths, and the latter secondary air is evenly distributed and reaches the flame holes. Regarding

[0002]

2. Description of the Related Art In recent hot water heaters and the like, the amount of combustion is increasing, and the forced combustion method is adopted. Among them, in the case where the Bunsen burner is used as the gas burner, an air supply fan is connected to the bottom plate of the burner box whose front part is configured to be removable, and the combustion air supplied from the air supply opening of this bottom plate is supplied. The gas is divided into primary air and secondary air and supplied to the gas burner. This requires that the supply amount of the primary air and the supply amount of the secondary air be set to a predetermined balance, and it is necessary to stabilize this air supply ratio, and the secondary air is a gas burner. Need to be uniformly distributed and supplied to the flame holes.

Further, in the case of the above-mentioned type of gas burner in which the combustion amount is increased, a large number of flat metal burner units are often arranged in parallel, and the total weight is relatively heavy. It was difficult to handle when installing or disassembling and repairing. The present invention has been made in view of the above point, and "a burner unit is detachably housed in a bottomed rectangular burner box having a removable front portion, and the primary air to the burner unit is removed. And the secondary air are forcibly supplied from the air supply fan attached to the bottom plate of the burner box, and the secondary air is supplied to the flame holes by dispersing the air supply from the air supply fan. In the "compulsive combustion device", when the burner unit is assembled or disassembled, its handling is easy, and the distribution of combustion air is made uniform, and the distribution ratio of primary air and secondary air can be stabilized. The task is to do so.

[0004]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is that "a gas supply pipe (N) is arranged in the front empty chamber (14) of the front of the burner box (1) and The gas supply pipe
Burner unit accommodating part corresponding to the nozzle of (N),
A first dispersion plate (12) having a large number of through holes is provided above the bottom plate (1c) of the burner box (1) and below the burner unit accommodating portion so that the left and right side edges and the rear end edge are provided with the burner box (1 ), The lower space of the first dispersion plate (12) facing the discharge port of the air supply fan (F) is opened to the front empty chamber (14), and the first dispersion plate (14) is opened. Providing a rising piece (12a) on the front edge of 12),
Above the first dispersion plate (12), a second gap is formed at a predetermined interval.
A dispersion plate (23) is provided, and a skirt portion is provided on the peripheral edge of the second dispersion plate (23). The second dispersion plate (23) is located above the first dispersion plate (12) and is a burner box (1). ), And the left and right hanging pieces (23a) (23a) forming the skirt are inserted into the gap between the rising piece (12a) and the left and right side walls of the burner box (1). , The front hanging plate (21a) that constitutes the skirt is fixed to the rising piece (12a) so as to be in contact with the rising plate (12a), and the burner unit is attached to the second dispersion plate (23). is there.

[0005]

The above technical means operates as follows. A first dispersion plate (12) having a burner unit fixed above the bottom plate (1c)
In order to mount and fix it on, the hanging piece (23a) of the rear edge that constitutes the skirt of the second dispersion plate (23) is placed near the rear of the rising piece (12), and the rising piece ( Insert the left and right hanging pieces (23a) (23a) of the skirt into the gap between the burner box (1) and the inner surface of the burner box (1).

The size of the second dispersion plate (23) is the burner box (1).
The size is set so as to substantially contact the left and right inner surfaces and the rear wall when inserted into. Also, in this inserted state, the rising piece
(12a) and the front hanging plate (21a) that constitutes the skirt portion
When the second dispersion plate (23), that is, the burner unit is pushed in to this state, the above is placed above the first dispersion plate (12) in the burner box (1). A secondary air chamber closed by the second dispersion plate (23) is formed.
If the burner unit is fixed in this state, the burner box
(1) will be set at a predetermined position.

Further, the front part of the lower first dispersion plate (12) is opened to the front empty chamber (14), and the left and right side edges and the rear end edge are the burner box (1).
Since it is fixed so as to face the inner surface of the
Secondary air volume determined by the dispersion plate (12) and front vacant chamber (14)
The ratio with the primary air amount is reliably set. And
As described above, the secondary air supplied in a dispersed state through the large number of through holes of the first dispersion plate (12) is supplied to the secondary air chamber closed by the second dispersion plate (23). Is further appropriately dispersed by the second dispersion plate (23) and supplied to the flame hole portion of the burner unit. That is, the secondary air is surely dispersed in two stages.

[0008]

[Effect] Second dispersion plate (23) integrated with burner unit
While sliding the skirt part of the above on the first dispersion plate (12), it is housed in the burner box (1), and the rising piece (12a) and the hanging plate.
By making contact with (21a), the burner unit is positioned at a predetermined position and the outer periphery of the vacant chamber between the first dispersion plate (12) and the second dispersion plate (23) is in a substantially sealed state. The secondary air is surely dispersed. That is, the secondary air is surely dispersed in two stages, and good combustion can be secured.

Further, since the distribution ratio of the primary air and the secondary air is set surely by the first dispersion plate (12), the burner unit can be easily disassembled and assembled, and the combustion stability can be secured.

[0010]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. In this embodiment, the present invention is applied to a combustion apparatus of a water heater, and as shown in FIG. 1, the water heater has a heat exchange above a burner box (1) having a combustion chamber. It consists of a series of cans (K) with built-in vessels.

This can body (K) has a well-known structure, and a heat exchange part having a structure in which a heat absorption tube having a large number of fins is meandered is arranged in the vicinity of an open upper end of a cylindrical can body. An exhaust device (not shown) is connected to the upper end of the body. The burner box (1)
A gas burner (B) is built in the cylindrical chamber, and the gas supply pipe (N) arranged on the side of the gas burner (B) and the combustion air to the gas burner (B) are supplied. fan
Each has a built-in air supply device for forced air supply from (F).

The burner box (1) is constructed as a bottomed rectangular tube as a whole, and has a box main body (1a) in which a rear wall and both side walls are integrated.
And a front plate (1b) that closes the front opening, and a bottom plate (1c) that closes the lower end of the tubular body formed by these. As shown in FIG. 3, the box main body (1a) has a structure in which flange portions (10a) and (10b) provided with upright pieces (11) are projected on the peripheral edges of the upper end and the lower end. Box (1)
Once, as shown in FIG. 2, the flange corresponding portions (La) (L) (L) corresponding to the flange portions (10a) (10b) from both upper and lower sides of the metal rectangular plate.
b) is a dish-shaped body provided with upright pieces (11), and is bent into a U-shape, and the upper flange portion (10a) is the flange-equivalent portion (La) thus bent. Front of flange (1
9) are connected in series to form a rectangular annular flange portion (10a).

When a rectangular plate having the flange equivalent portions (La) (Lb) is bent into a U-shape, it depends on the bending curvature, but in any case, at the bent portion, the flange equivalent portion (La) ( Lb) becomes an obstacle. Therefore, in the flange equivalent part (Lb) that becomes the lower flange part (10b), the range corresponding to the bent part is the cutout part.
(L ₁ ), and the flange equivalent portion (La) corresponding to the upper flange portion (10a) has a tongue piece at the center of the range corresponding to the bent portion.
(L ₂ ) is left and both sides thereof are cutouts (L ₁ ). In addition,
The tongue (L ₂ ) is a strip-shaped member with a constant width,
Like the cross section of a), it is set to have a shape with an upright piece (11).

The flange equivalent portion (La) and the flange front portion (1
9) is connected by means such as spot welding, but in the continuous state, the upper surface of the flange equivalent portion (La) and the upper surface of the flange front portion (19) are flush with each other, as shown in FIG. As shown in the figure,
A step portion (19a) corresponding to the thickness of (La) is provided. The burner box (1) constructed in this way has a can body (K) above it.
, And a mounting flange (K ₁ ) is provided around the lower end of the can body (K), and the size is set so that the mounting flange (K ₁ ) is just fitted into the upright piece (11). Then, the can body (K) that has been assembled into a predetermined structure in advance has a heat resistant packing (G
₁ ) is connected between the flange portion (10a) and the flange (K ₁ ) by caulking, screwing or the like.

The upper surface of the flange portion (10a) is formed into a uniform plane.
Since it is made, this enables the can body (K) and the burner box.
The confidentiality of the connection with (1) is secured. This secret burns
A seal that shuts off exhaust is sufficient, but heat resistance is required.
Therefore, heat-resistant packing (G ₁), For example, a glass
Wool and asbestos are used. These materials are very fragile
There is a property.

Therefore, the corner portion of the flange portion (10a) is cut off.
Missing part (L₁), The heat-resistant packing (G₁) Bottom surface
Does not come into contact with the flange (10a),
Thermal packing (G₁) Tends to come off. However,
In the above embodiment, the corner portion of the flange portion (10a)
Is the notch (L₁) (L₁) Is set relatively small
Notch (L₁) (L₁) Between the tongue (L₂) Is at the tip of this
The upright piece (11) is the heat-resistant packing (G₁) Is facing the edge
Therefore, the heat-resistant packing (G₁) Corner section
Is retained, and the outward shift in the above situation can be prevented.
The cutout (L ₁) Is the width direction of the flange (10a)
Instead of being installed over the entire area of the
Flange (10a) and small flange (L₃), Heat resistance
Packing (G ₁) Is the flange (10a) and the flange (K₁) By
It is pinched across the entire area.

A gas burner (B) is stored in the burner box (1).
This gas burner (B) is shown in Figs.
The elongated flame hole (B₂), And a large number of flat top and bottom
Burner alone (B₁) Side by side in the burner box (1).
Each burner alone (B₁) Is a so-called light and dark burner
I am doing it. Therefore, the flame hole (B₂), The high gas concentration
No. 1 flame hole (H₁) And gas concentration
The second flame hole (H₂) And are parallel to the left and right
The structure of the flame hole (B₂The flame holes at the left and right ends of
Highly concentrated first flame hole (H₁) (H₁). In addition, this concentration
In the light burner, the burner body with high gas concentration and the gas concentration
Burner body configuration that overlaps the low burner body
As a result, each burner body's primary air outlet is
Le (N₁) (N ₁) Is corresponded. Gas from each nozzle
By setting the volume and the primary air suction ratio to the specified values,
The downstream ends of the separate gas-air mixture paths
Flame hole (B₂) Is the first flame hole (H₁) And the second flame hole (H₂)
And will be configured.

A large number of burner units (B
₁ ) (B ₁ ), and these burner units are integrally assembled by a frame for assembling the burner. The frame body includes a front plate (21) and a rear plate (22) thereof, and a second dispersion plate (23) having a plurality of through holes connecting the lower ends thereof to each other. The sides of the (21) and rear plate (22) are mutually side plates (24)
Connected by (24) to form a rectangular frame as a whole,
In the assembled state, the burner unit includes the second dispersion plate (23) shown in FIGS. 1, 5 and 6.

As shown in FIG. 1, the front plate (21) is
Burner alone (B₁The opening (25) is shaped to match the primary air inlet.
The burner unit is housed in the burner box (1)
In this state, the gas supply housed in the burner box (1) is installed.
Multiple nozzle holes (N) in feed pipe (N) ₁) And the opening (25) are separate
To face. Install the gas burner on the bottom plate (1c) of the burner box (1).
Install the air supply fan (F) so that it is located below (B).
The first dispersion plate with a predetermined space above it.
(12) is arranged and fixed, and the burner is attached to the first dispersion plate (12).
The unit is placed and fixed.

The second unit integrated with the burner unit
The dispersion plate (23) is placed and fixed on the first dispersion plate (12) with a predetermined space. Therefore, as shown in FIGS. 1 and 7, extension pieces (13) hang down from the rear side and the left and right side edges of the first dispersion plate (12), and the extension pieces (13) are burner boxes.
It is fixed in contact with the inner side wall of the box body (1a) of (1). Therefore, a predetermined empty chamber (Z ₁ ) that opens to the front is formed between the bottom plate (1c) and the first dispersion plate (12), and the combustion air supplied from the air supply fan (F) is Part of it is the front opening (13a)
Is supplied as primary air to the front chamber (14) of the burner unit through the other part of the second dispersion plate (12) and the second dispersion plate through a large number of through holes of the first dispersion plate (12). Vacancy between boards (23) (Z ₂ )
And is further supplied as secondary air to the accommodating portion of the gas burner (B) through the through hole of the second dispersion plate (23).

Further, as shown in FIGS. 1 and 7, the second dispersion plate
On the (23), hanging pieces (23a) are formed extending from the left and right sides and the rear side. On the other hand, a rising piece (12a) that bends upward is connected to the front end of the first dispersion plate (12). The left and right width of the rising piece (12a) is set to a predetermined length in relation to the left and right width of the box body (1a). Between the both side walls of the main body (1a), as shown in FIG.
A gap with a width that allows a) to be inserted is formed.

Further, a hanging plate (21a) is connected to the lower end of the front plate (21) from the edge of the rearward bent portion.
The front edge of the second dispersion plate (23) is placed and fixed on the upper end of (a). The hanging plate (21a) is arranged over the entire left and right sides of the lower surface of the second dispersion plate (23), and also the second dispersion plate (23).
When the hanging piece (23a) following the rear side is in contact with the inner surface of the rear wall of the box main body (1a), the hanging piece (23a) is arranged at a position where it is in contact with the rising piece (12a). The hanging pieces (23a) (23a) and the hanging plate (21a) form the skirt portion of the second dispersion plate (23).

When assembling the gas burner (B) in the burner box (1), with the front plate (1b) not attached,
A first dispersion plate (1) fixed in advance in a state of being in contact with the inner peripheral surface of the box main body (1a) and placed on the bottom plate (1c) to form a vacant chamber (Z ₁ ).
The burner unit is inserted on the upper surface of 2). Therefore, the hanging piece (23a) on the rear side of the second dispersion plate (23) is placed behind the rising piece (12a) of the first dispersion plate (12), and the hanging pieces (left and right) as shown in FIG. When the burner unit is inserted so that (23a) and (23a) pass through the gap, the hanging plate is placed at the final specified insertion position.
The (21a) and the rising piece (12a) are brought into contact with each other and screwed together, and the rear hanging piece (23a) is brought into contact with the inner surface of the rear wall of the box main body (1a). As described above, the burner unit is composed of a large number of burner units (B ₁ ), which is equipped with a frame body and the like, so that the total weight is heavy and the handling is troublesome. Since the portion is placed on the first dispersion plate (12) and is slid and pushed in to be positioned at a predetermined position, the assembling work is easy.

The vacant chamber (Z) below the first dispersion plate (12)₁) Is
By the extension piece (13) and the inner peripheral surface of the box main body (1a),
Air leakage from the left and right sides and rear side of the first dispersion plate (12)
Will hardly occur. In addition, the first dispersion plate (12) and the first
2 Vacancy between the dispersion plate (23) (Z ₂) Also has a box-shaped surrounding (1a)
And the hanging plate (21a) and the rising piece (12a)
Since it is definitely surrounded by the confrontation of
Air leakage from the periphery of the spreading plate (23) is unlikely to occur. Therefore,
Secondary air distribution by the first dispersion plate (12) and the second dispersion plate (23)
The degree of dispersion is equalized, and the primary
Variations in the air distribution ratio can also be eliminated.

When the burner unit is installed as described above, thereafter, parts such as the gas supply pipe (N) are installed in the front chamber (14), and the box main body (1a) is installed by the front plate (1b). Although the front opening of the gas burner is closed, this front plate (1b)
Upper plate (15) for closing the front side that coincides with the upper area of (B)
And a lower plate (16) for closing the front surface of the lower region thereof, and the upper plate (15) has a discharge mechanism portion of the ignition device,
The detection tool (S) of the flame detection device is attached.

The above-mentioned detection tool (S) is the second burner from the end.
Single unit (B₁) Flame hole (B₂) Above the detector (S₁)
The discharge mechanism is attached to the electrode.
It consists of a plate (T) and a spark plug (P), the fourth from this end.
Burner unit (B₁) Flame hole (B ₂). The above
The spark plug (P) is an electrode part (P
₁), And the electrode part (P₁5) and the tip of FIG.
As shown in Fig. 9, the flame hole (B₂) 1st flame hole (H ₁) Inside
2 flame holes (H₂) Is attached so that it is located above. Well
This electrode part (P₁), The electrode plate (T) facing
It is attached to the burner unit (B).₁)of
Touch the side edge. Also, install it at the tip of this electrode plate (T).
Cathode part (T₁) Is the flame hole (B₂) Slightly above the side edge
It is located towards.

As a result, discharge sparks from the electrode portion (P ₁ ) to the cathode portion (T ₁ ) are generated from the jet area of the air-fuel mixture having a low gas concentration to the jet area of the air-fuel mixture having a high gas concentration. Since a proper ignition concentration range is passed in the ignition discharge path, reliable ignition performance can be obtained even in so-called lean combustion. Also,
In this embodiment, as shown in FIG. 1, when the upper plate (15) is formed with an insertion hole for the spark plug (P) immediately above the spark plug (P) on the inner surface of the upper plate (15). A portion corresponding to this insertion hole is cut and raised, and a protection plate (17) bent obliquely upward is continuously provided. Therefore, even if the condensed water generated on the inner surface of the burner box (1) flows down from above the spark plug (P), the protective plate (17)
As a result, the condensed water is guided to the left and right of the spark plug (P), and the inconvenience that the spark plug (P) and the upper plate (15) as a mounting portion of the spark plug (P) become a leakage state due to the condensed water is eliminated. . In addition, the protective plate (17) for this is the spark plug.
Since it is formed at the same time when the insertion hole of (P) is formed, there is no waste of material and no assembly work is required.

In the above embodiment, the front plate (21) and the hanging plate (21a) are integrated, and the second plate is formed on the upper surface of the hanging plate (21a).
Although the front edge of the dispersion plate (23) is connected and fixed, the front plate (21) and the second dispersion plate (23) are integrally formed and separated from the front edge of the dispersion plate (23). A body hanging plate (21a) may be attached.

[Brief description of drawings]

FIG. 1 is a sectional view of a water heater according to an embodiment of the present invention.

[Fig. 2] Explanatory drawing of an intermediate product before forming the box main body (1a)

FIG. 3 is a perspective view of the burner box (1)

FIG. 4 is a cross-sectional view taken along the line YY of the main box body (1a).

FIG. 5 is a plan view of the burner unit.

FIG. 6 is a front view of the main part of the burner unit.

[Fig. 7] Exploded view of the bottom of the burner box (1)

FIG. 8 is a sectional view of the vicinity of the bottom of the burner box (1).

FIG. 9 is a sectional view of the flame hole portion (B ₂ ) of the burner unit (B ₁ ).

[Explanation of symbols]

(H ₁ ) ・ ・ ・ First flame hole (H ₂ ) ・ ・ ・ Second flame hole (T) ・ ・ ・ Electrode plate (B ₂ ) ・ ・ ・ Flame hole part (P) ・ ・ ・ Spark plug (P ₁ ) ... Electrode part

Claims (1)

[Claims] Claims: 1. A burner unit is detachably housed in a bottomed rectangular cylindrical burner box having a removable front portion, and primary air and secondary air to the burner unit are attached to a bottom plate of the burner box. In the forced combustion device in which the supply air from the supply air fan is forcibly supplied and the supply air from the supply air fan is dispersed and supplied to the flame holes, the secondary air is supplied to the burner box (1). A gas supply pipe (N) is arranged in the front empty space (14) in the front part, and this rear region is used as a burner unit accommodating portion corresponding to the nozzle of the gas supply pipe (N), and a burner box
A first dispersion plate (12) having a large number of through holes is provided above the bottom plate (1c) of (1) and below the burner unit accommodating portion so that the left and right side edges and the rear edge of the burner box (1) are The first dispersion plate facing the inner surface and facing the discharge port of the air supply fan (F)
The space below (12) is opened to the front empty space (14), and a rising piece (12a) is provided at the front edge of this first dispersion plate (12).
Above the dispersion plate (12), the second dispersion plate (2
3) is provided and a skirt portion is provided on the periphery of the second dispersion plate (23), and the second dispersion plate (23) is the first dispersion plate (12).
The size of the skirt that is just inserted into the burner box (1) above the left side of the burner box (1).
(23a) (23a) is inserted, and the front hanging plate (21a) that constitutes the skirt is fixed to the rising piece (12a) so as to be in contact with the rising plate (12a). Combustion device with burner unit attached to.