JPH05678Y2 - - 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 rectifier plate, as in the above conventional technology, as shown in Fig. 3. 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 has had the problem that primary air and secondary air cannot be uniformly supplied 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, this invention reduces the noise of the fan in a bathtub with a water heater that has a horizontally long burner case, and is as small as possible and can supply primary air and secondary air uniformly to all combustion pipes. The purpose is to provide combustion equipment.

(Means for Solving the Problem) 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 provided with an opening that communicates with the duct and the air chamber over most of the portion that is connected to the duct. Furthermore, a partition plate is provided approximately at the center of the opening from the front of the bottom plate to the rear of the bottom plate.

FIG. 1 is a front sectional view showing one embodiment of the present invention;
Fig. 2 is a cross-sectional view of one embodiment of the present invention taken along line AA. In Fig. 1 and Fig. 2, the burner case 1 is composed of a case body 21 consisting of a rear vertical plate 1a and a bottom plate 1b, and two members consisting of a front vertical piece 22 formed integrally with the straightening plate 3, a horizontal piece 23, and a front vertical plate 24. The rear vertical piece 22 has through holes 22a opening opposite the gas inlets 20 of the multiple combustion tubes 2. A damper 5 having a primary air intake hole 5a formed therein for adjusting the amount of primary air for each combustion tube 2 is provided in front of the through holes 22a.
The primary air intake hole 5a corresponds to the primary air intake hole 5a. The combustion tube 2 is composed of a plurality of hot water supply combustion tubes 2b and a smaller number of bath combustion tubes 2a.
Next, the baffle plate 3 is provided below the combustion tube, and has a number of secondary air holes 3a. The combustion tube 2 and the baffle plate 3 are connected to the bottom plate 1 of the burner case 1.
b) is placed in the burner case 1, and the lower surface of the baffle plate 3 and the burner case 1
A horizontal part of the air chamber 6 is formed between the bottom of the burner case 1 and the bottom of the burner case 1. A recess 8 for arranging a vertical nozzle holder 7 is formed in the lower front part of the burner case 1, which is aligned with the cut-out part of the combustion tube 2. The lower end of the nozzle holder 7 protrudes downward from the bottom plate 1b of the burner case. The recess 8 forms the vertical part of the air chamber 6. A number of nozzles 4 protrude from the nozzle holder 7 housed in the recess 8, and each nozzle 4 faces the gas inlet 20, the through hole 22a, and the primary air intake hole 5a of the corresponding combustion tube 2. 11 is a duct connected to the approximately center of the bottom plate 1b in the longitudinal direction of the burner case 1, narrower than the width of the burner case 1. In FIG. 1, the duct 11 is provided on the bottom plate 1b of the burner case 1 from approximately the middle between the bath combustion tube 2a at the right end and the hot water supply combustion tube 2b at the left end to a little to the left of the hot water supply combustion tube 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. The duct 11 is provided at the lower rear of the vertical nozzle holder 7. The duct 11 has a nozzle hole 11a extending from the bottom to the top of the burner case 1.
A right inclined surface 11a and a left inclined surface 11b are disposed so that the width of the duct 11 increases in the longitudinal direction. A connection port 11c for a fan 12 is provided on the inclined surface (the left inclined surface 11b in FIG. 1).
The fan 12 has a tongue 12b facing upward, and an air outlet 12a connected to the left inclined surface 11b of the duct 11, the air outlet 12a facing upward and to the upper right. An opening 16 is provided over most of the portion of the burner case bottom plate 1b that is connected to the duct 11, which allows the duct 11 to communicate with the air chamber 6.
At the center of the bottom plate 6, a bottom plate front part 1c is provided.
A partition plate is provided between the upper and lower portions of the casing.
In the drawing, a partition plate 13 is provided between the left end hot water supply combustion tube 2b and the central hot water supply combustion tube 2b, extending from the front part 1c of the bottom plate to the lower end of the rear vertical plate 1a. The partition plate 13 divides the opening 16 of the bottom plate 1b of the burner case at the part connected to the duct 11 into an opening 14 and an opening 15.

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 discharged from the duct first enters the duct 11.
Due to the characteristics of the fan, some of the air coming out of the air outlet 12a tends to flow toward the tongue part 12b, so some of the air sent out from the fan 12 and coming out of the opening 15 passes through the air chamber 6 and enters the bath. It is supplied to the combustion tube 2a. Since the number of bath combustion pipes 2a is smaller than that of the hot water supply combustion pipes 2b, air is uniformly supplied to all the combustion pipes. Also, part of the air coming out of the opening 15 is transferred to the air chamber 6.
The hot water is supplied through the interior from the left end hot water supply combustion pipe 2b to the right end supply combustion pipe 2b. However, since the hot water combustion pipes 2b near the center and left 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. Next, Juan 12
A part of the air sent out flows to the right inside the duct 11, exits from the opening 14, passes through the air chamber 6, and flows from the hot water combustion pipe 2b at the center to the hot water combustion pipe 2b at the right end.
It is supplied throughout the period. That is, 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 to the hot water supply combustion pipe 2b near the right end. Further, the air sent out from the fan 12 and colliding with the partition plate 13 is diverted to the right, exits from the opening 14, enters the air chamber 6, and is supplied to the hot water supply combustion pipe 2b near the center. Therefore, air is uniformly supplied to all hot water supply combustion pipes 2b. Furthermore, the primary air and secondary air supplied to each combustion pipe of the bath combustion pipe 2a and the hot water supply combustion pipe 2b are supplied through the primary air intake hole 5a provided in the damper 5 and the passage formed in the rectifier plate 3, respectively. The amount can be adjusted appropriately by the hole 3a.

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.

In the above embodiment, the duct 11 is provided on the bottom plate 1b of the burner case from approximately the middle between the bath combustion pipe 2a and the hot water combustion pipe 2b to a little left of the right end of the hot water combustion pipe 2b. The combustion device can be made smaller than if the entire bottom plate 1b of the burner case was moved 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. Furthermore, the duct 11 is provided at the lower rear of the vertical nozzle holder 7, which is a dead space for the combustion device in the appliance, so that even if the duct 11 is provided, the appliance will not become larger. In addition, in the above embodiment, the partition plate 13 is connected to the burner case 1.
Although the bottom plate 1b is provided separately, it may be provided integrally with the bottom plate 1b.

(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, a portion of the bottom plate of the burner case that is connected to the duct is provided with an opening that communicates the duct and the air chamber over most of the area, and an opening is provided approximately in the center of the opening. Since the structure is such that a partition plate is provided from the front part of the bottom plate to the rear part of the bottom plate, primary air and secondary air can be uniformly supplied to each combustion tube. Therefore, there is no need to increase the rotation speed of the fan, and noise can be prevented. Further, even if the 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.

[Brief explanation of drawings]

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 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, 6... Air chamber , 11... duct, 11a... right inclined surface (inclined surface), 11b...
...Left inclined surface (slanted surface), 12...Fan, 12
a...Air outlet, 12b...Tongue, 13...Partition plate, 16...Opening.

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. A combustion device characterized in that an opening for communication with an air chamber is provided over most of the area, and a partition plate is provided approximately in the center of the opening from the front of the bottom plate to the rear of the bottom plate.