JPH05679Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a combustion device having a horizontally elongated burner case.

(Prior Art) Conventionally, in water heaters, as shown in FIG. The amount of secondary air in No. 2 was adjusted to be uniform. The amount of primary air in each combustion tube 2 is determined by a primary air intake hole 5 between the combustion tube 2 and the nozzle 4 that injects fuel.
By providing a damper 5 with a hole a and changing the hole diameter of the primary air intake hole 5a, it was adjusted to be uniform.

(Problem to be solved by the invention) However, if the adjustment of the primary air amount and secondary air amount of each combustion tube 2 is handled only by a damper and a rectifying plate as in the above-mentioned conventional technology, as shown in Fig. 5. In a bathtub with a water heater having a horizontally long burner case as shown in the figure, the width l of the burner case 1 is long, so
Excessive primary air and secondary air are supplied to the entire bath combustion pipe 2a near the opening 9 provided at one location on the bottom plate 1b of the burner case 1 and the hot water supply combustion pipe 2b at the left end, whereas the central part The hot water supply combustion pipe 2b is far away from the fan 11, resulting in a shortage of primary air and secondary air, and there was a problem in that it was not possible to uniformly and sufficiently supply primary air and secondary air to all combustion pipes. .

As a countermeasure to the above problems, it is possible to increase the number of rotations of the fan in order to sufficiently supply air to the combustion tube where there is a shortage of primary air and secondary air, and to increase the number of rotations of the fan to accommodate the increase in the width l of the burner case 1. It is conceivable to increase the height h of the combustion chamber so that air is uniformly supplied to all combustion tubes, but problems such as fan noise and an increase in the size of the combustion device remain. However, in particular, the size of the burner case is constrained and needs to be made smaller due to the miniaturization of the appliance.

In order to solve the above problems, the present invention aims to reduce fan noise in a bathtub with a water heater that has a horizontally long burner case, to make it as small as possible, to uniformly distribute primary air and secondary air to all combustion pipes, and to The purpose is to provide a combustion device with sufficient supply.

(Means for Solving the Problems) In order to achieve the above object, the combustion device of the present invention includes a plurality of combustion tubes in a horizontally long burner case,
In the case where an air chamber is formed below the burner case, a duct is connected to approximately the center of the bottom plate of the burner case, and the duct is provided with an inclined surface so that the width in the longitudinal direction increases from the bottom to the top. The air outlet of the fan is connected to the inclined surface with the tongue facing upward, and the bottom plate of the burner case is connected to the duct with an opening that communicates the duct and the air chamber over most of the area. The air chamber provided below the combustion tube is provided with a plurality of partition plates diagonally with respect to the longitudinal direction of the burner case when viewed from below.

(Example) Figure 1 is a front sectional view showing an example of the present invention.
FIG. 2 is a sectional view taken along line AA of an embodiment of the present invention. In FIGS. 1 and 2, the burner case 1 includes a case body 21 consisting of a rear vertical plate 1a and a bottom plate 1b, a front vertical piece 22, a horizontal piece 23 and a front vertical plate 24 integrally formed with the rectifying plate 3. It is composed of two members. A through hole 22 a is opened in the front vertical piece 22 so as to face the gas inlets 20 of the plurality of combustion tubes 2 . A damper 5 having a primary air intake hole 5a for adjusting the amount of primary air in each combustion tube 2 is provided on the front surface of the through hole 22a.
and the primary air intake hole 5a are made to correspond to each other. The combustion pipe 2 is composed of a plurality of hot water supply combustion pipes 2b and a smaller number of bath combustion pipes 2a.
Next, the baffle plate 3 is provided below the combustion tube, and is provided with a large number of secondary air passage holes 3a. The combustion tube 2 and the rectifying plate 3 are the bottom plate 1 of the burner case 1.
It is stored in the burner case 1 in a state floating above b, and the lower surface of the rectifier plate 3 and the burner case 1
A horizontal portion of the air chamber 6 is formed between the bottom surface of the air chamber 6 and the bottom surface of the air chamber 6. A recess 3 for arranging a vertical nozzle holder 7 is formed in the lower front portion of the burner case 1 so as to match the notch-shaped portion of the combustion tube 2. The lower end of the nozzle holder 7 protrudes below the bottom plate 1b of the burner case. Further, the recess 8 is a vertical portion of the air chamber 6. A plurality of nozzles 4 protrude from the nozzle holder 7 housed in the recess 8, and each nozzle 4 is arranged so as to face the gas inlet 20, through hole 22a, and primary air intake hole 5a of the corresponding combustion tube 2. I'm letting you do it. Reference numeral 11 denotes a duct which is narrower than the width of the burner case 1 in the longitudinal direction of the burner case 1 and is connected to approximately the center of the bottom plate 1b. In FIG. 1, the duct 11 is provided on the bottom plate 1b of the burner case 1, from approximately midway between the bath combustion pipe 2a at the right end and the hot water combustion pipe 2b at the left end, to slightly to the left of the hot water combustion pipe 2b at the right end. When viewed from the side of the burner case 1, the duct 11 has approximately the same width as the bottom plate 1b. Further, the position where the duct 11 is provided is at the lower rear of the vertical nozzle holder 7. The duct 11 includes a burner case 1 from the bottom to the top.
A right inclined surface 11a and a left inclined surface 11b are arranged so that the width of the duct 11 becomes wider in the longitudinal direction. A connection port 11c with the fan 12 is provided on the inclined surface (the left inclined surface 11b in FIG. 1).
The tongue portion 12b of the fan 12 is oriented upward, and the air outlet 12a is connected to the left inclined surface 11b of the duct 11, and the air outlet 12a is oriented upward to the right. An opening 16 that communicates the duct 11 and the air chamber 6 is provided over most of the burner case bottom plate 1b at a portion connected to the duct 11 (approximately at the center). is the front part of the bottom plate 1c
A full plate 13 is provided from the rear part 1d of the bottom plate. In FIGS. 1 and 2, a buttful plate 13 is provided approximately midway between the hot water supply combustion pipe 2b at the left end and the hot water supply combustion pipe 2b at the center from the front part 1c of the bottom plate to the lower end of the rear vertical plate 1a. The opening 16 of the bottom plate 1b of the burner case, which is the part connected to the duct 11 by the baffle plate 13, is connected to the opening 14 and the opening 15.
It can be divided into

Furthermore, on the lower surface of the rectifying plate 3, there are provided a plurality of partition plates 31 to 33 that adjust the flow of air that has come out of the openings 14 and 15 and entered the air chamber 6, and is oblique to the longitudinal direction of the burner case when viewed from below. It is set up in
In other words, the partition plate 31 is located at a corner inside the burner case 1 (the upper left corner in FIG. 3) on the lower surface of the rectifying plate 3.
The partition plate 32 is provided at the lower surface of the rectifying plate 3 at the corner ( In FIG. 3, it is provided from the top left corner (in FIG. 3) to the position of the full plate 13. Further, the partition plates 31 and 32 have a shape in which the left or right half of the upper half of the rectangular plate is cut out, and the respective notches 31a and 32a are located at the rear lower part of the bath combustion pipe 2a. 31
The upper end surface of the portion without a and 32a is attached to the rectifier plate 3 by spot welding or the like. Next, partition plate 3
3 is rectangular, and is provided on the lower surface of the rectifier plate 3 from the rear of the burner case 1 slightly to the left of the central hot water supply combustion pipe 2a to the position of the bottom plate front portion 1c slightly to the right of the central hot water supply combustion pipe 2a. . Furthermore, gaps 31b to 33b are provided below each of the partition plates 31 to 33 and to the bottom plate 1b.

The partition plates 31 to 33 may be moved downward in parallel and their lower end faces may be attached to the upper face of the bottom plate 1b of the burner case, as in the second embodiment shown in Fig. 4. In this case, a gap is generated between the straightening plate 3 and the partition plates 31 to 33 above them.

Next, the operation of the above configuration will be explained. When the fan 12 is driven, the air outlet 12a of the fan 12
The air sent out first enters the duct 11,
Since it spreads throughout the duct 11, all combustion pipes 2a,
2b can be secured.
Next, due to the characteristics of the fan, some of the air coming out of the air outlet 12a tends to flow toward the tongue 12b, so most of the air sent out from the fan 12 and coming out of the opening 15 flows toward the bath combustion pipe 2a. However, the amount of air that hits the partition plate 32 and flows toward the bath combustion pipe 2a is reduced and suppressed to an appropriate amount.
Sent to side b. Then, the notch 3 of the partition plate 32
2a or the air passing through the lower gap 32b,
Furthermore, primary air and secondary air are supplied to the full-bath combustion pipe 2a by air flowing through the notch 31a of the partition plate 31 or the lower gap 31b.

Note that if there is no partition plate 31, the amount of primary air supplied to the central bath combustion pipe 2a will be somewhat larger than that to the bath combustion pipes 2a near both ends. 32 notch 3
2a or the lower gap 32b hits the partition plate 31, it is possible to prevent a large amount of primary air from being supplied to the central bath combustion pipe 2a,
The amount of primary air in all bath combustion pipes 2a becomes uniform.

Furthermore, when the partition plates 31 and 32 are simply made of rectangular plates, there is a shortage of secondary air at the rear of the bath combustion pipe 2a.
By providing 1a and 32a, the air that has passed through the notch 32a of the partition plate 32 and the air that further flows through the notch of the partition plate 31 can be used to burn the bath combustion pipe 2a.
This makes it possible to compensate for the lack of secondary air at the rear, and evenly supplies secondary air to all the bath combustion pipes 2a.

Furthermore, since the partition plates 31 and 32 receive the air flow obliquely, the air resistance can be made smaller than when the partition plates 31 and 32 are provided perpendicularly to the longitudinal direction of the burner case when viewed from below.

Next, part of the air coming out of the opening 15 is transferred to the air chamber 6.
It is supplied as primary air and secondary air from the hot water supply combustion pipe 2b at the left end to the hot water supply combustion pipe 2b at the right end through the horizontal and vertical parts of . However, since the hot water combustion pipes 2b near the center and right end are far from the fan 12, the amount of air supplied is smaller than that of the hot water combustion pipe 2b near the left end. However, the air sent out from the fan 12 and colliding with the baffle plate 13 is diverted to the right, exits from the opening 14 and enters the air chamber 6, and a portion of the air passing through the horizontal portion of the air chamber 6 passes through the partition plate. 33, the air flowing upward from there supplies secondary air to the hot water supply combustion pipe 2b near the center, and the air flowing along the partition plate 33 to the vertical part of the air chamber 6 supplies primary air to the center. The lack of air in the hot water combustion combustion pipe near the area will be resolved. Furthermore, since the partition plate 33 receives the air flow obliquely, air resistance can be reduced.

Next, a portion of the air sent out from the fan 12 flows rightward within the duct 11, exits from the opening 14, passes through the air chamber 6, and is supplied toward the hot water supply combustion pipe 2b near the right end. In other words, part of the air hits the right inclined surface 11a of the duct 11, flows upward to the right along the right inclined surface, and is supplied as primary air and secondary air to the hot water combustion pipe 2b near the right end.

Therefore, even and sufficient air is supplied to all hot water supply combustion pipes 2b. And further bath combustion pipe 2
The primary air and secondary air supplied to each of the combustion pipes a and hot water supply combustion pipe 2b are adjusted to an appropriate amount by the primary air intake hole 5a provided in the damper 5 and the through hole 3a provided in the rectifier plate 3, respectively. be done.

Next, gas mixed with a sufficient amount of primary air is sent into the entire bath combustion pipe 2a and the entire hot water supply combustion pipe 2b. On the other hand, secondary air passes through the through holes 3a of the baffle plate 3, rises from between the combustion tubes 2, and is consumed in combustion.

Next, regarding the operation of the second embodiment in which the partition plates 31 to 33 are provided on the upper surface of the bottom plate 1b of the burner case, only the points that differ from the operation of the first embodiment will be described.

The air passing through the notch 32a of the partition plate 32 or the upper gap and the notch 31 of the partition plate 31
The full bath combustion tube 2a is supplied with primary air and secondary air by the air flowing through the upper gap. By providing the partition plate 31, the partition plate 3
A part of the air that has passed through the notch 32a of 2 or the upper gap hits the partition plate 31, so it is possible to prevent a large amount of primary air from being supplied to the central bath combustion pipe 2a, and the primary air of all the bath combustion pipes 2a is The amount becomes uniform.

In the first and second embodiments, the duct 11 is located in the bath combustion pipe 2a on the bottom plate 1b of the burner case.
and the hot water combustion pipe 2b from approximately midway between the hot water supply combustion pipe 2b
Since it is provided slightly to the left of the right end of the burner case, the combustion device can be made more compact than if the height of the air chamber 6 were increased and the entire bottom plate 1b of the burner case was shifted downward. Further, since the tongue portion 12b of the fan 12 is directed upward and the air outlet 12a is connected to the left inclined surface 11b of the duct 11, the height from the upper end of the burner case 1 to the lower end of the fan 12 can be reduced. Further, the position where the duct 11 is provided is at the lower rear of the vertical nozzle holder 7,
Since this is a dead space for the combustion device in the appliance, even if the duct 11 is provided, the appliance will not become larger. In addition, in the above embodiment, the full board 1
3 is provided separately from the bottom plate 1b of the burner case 1, but may be provided integrally with the bottom plate 1b. In addition, by changing the height of the partition plates 31 to 33, the size of the lower gap can be changed, and the amount of air passing through the gap can be adjusted. Similarly, by changing the size of the notches 31a, 32a of the partition plates 31, 32, the amount of air passing through can be adjusted.

(Effects of the Invention) As is clear from the examples above, the combustion device of the present invention has a plurality of combustion tubes in a horizontally long burner case and an air chamber formed below the combustion tubes.
A duct is connected to approximately the center of the bottom plate of the burner case, and the duct is provided with an inclined surface such that the width in the longitudinal direction increases from the bottom to the top. In addition to connecting the air outlet of the fan, the bottom plate of the burner case is provided with an opening that communicates with the duct and the air chamber over most of the portion that is connected to the duct, and is further provided below the combustion pipe. The air chamber has multiple partition plates installed diagonally to the longitudinal direction of the burner case when viewed from below, so the duct can ensure a sufficient amount of air to supply all combustion pipes, allowing the fan to There is no need to increase the rotation speed, which helps prevent noise. Further, even if a duct is provided, the size of the appliance will not be increased to the extent that the height of the air chamber is increased and the entire bottom plate of the burner case is shifted downward. In addition, the partition plate can suppress the amount of air supplied to the combustion tubes where an excessive amount of air is supplied, and guide air to the combustion tubes where the amount of air is insufficient, thereby uniformly supplying primary air and secondary air to each combustion tube. can. Furthermore, the air resistance due to the partition plate can be made smaller than when the partition plate is provided perpendicularly to the longitudinal direction of the burner case when viewed from below.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the present invention;
Figure 2 is a sectional view taken along the line AA of one embodiment of the present invention;
The figure is a sectional view taken along line BB of one embodiment of the present invention, FIG. 4 is a front sectional view showing another embodiment of the present invention, and FIG. 5 is a front sectional view showing a conventional example. 1... Burner case, 1b... Bottom plate of burner case, 1c... Front part of bottom plate (bottom plate of burner case), 1d... Rear part of bottom plate (bottom plate of burner case), 2... Combustion pipe, 3... Rectifier plate , 6... Air chamber, 11... Duct, 11a... Right inclined surface (inclined surface), 11b... Left inclined surface (inclined surface), 12... Fan, 12a... Air outlet, 12b... Tongue, 16
...Opening, 31, 32, 33...Partition plate.

Claims (1)

[Scope of utility model registration request] In a horizontally elongated burner case with a plurality of combustion tubes and an air chamber formed below the burner case, the bottom plate of the burner case has a slope at approximately the center so that the width in the longitudinal direction increases from the bottom to the top. A duct with a surface is connected to the duct, and the air outlet of the fan is connected to the inclined surface with the tongue facing upward, and a portion of the bottom plate of the burner case connected to the duct is connected to the duct. Most of the openings are provided to communicate with the air chamber, and the air chamber provided below the combustion tube is provided with multiple partition plates diagonally to the longitudinal direction of the burner case when viewed from below. Characteristic combustion device.