JPH03110310A - Gun type burner - Google Patents

Abstract

PURPOSE:To prevent noises at the time of the maximum combustion and prevent smoke at the time of the minimum combustion and make it possible to provide stable combustion control by driving a damper device used for switching air flow channel and provided to the rear of a plurality of air flow channels that communicate with a combustion chamber. CONSTITUTION:It is possible to supply primary air and secondary air through a primary air flow-in hole 30 and a secondary air flow-in hole 32 from an air transporting cylinder 12. And an opening at the end of a tertiary air flow channel 33 communicates with the inner space 34 of a heat exchanger 11. And, since primary, secondary, and tertiary air volumes Q1, Q2, and Q3 can be changed over and regulated freely by a damper device C for switching air flow channels that is provided between the main body 20 of a cylindrical burner and the air transporting cylinder 12, it is possible to carry out stable combustion control. Further, by making the ratio of the primary air volume Q1 and secondary air volume Q2, Q1:Q2=2:1 at the time of maximum combustion and Q1:Q2=1:1 at the time of minimum combustion, it is possible to prevent the generation of noises as much as possible at the time of maximum combustion and prevent the generation of soot and smoke as much as possible at the time of minimum combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a gun-type burner device used in domestic oil water heaters and the like.

(b) Conventional technology Conventionally, as a form of this type of gun type burner device,
There is a type shown in FIG.

As shown in the figure, a combustion cylinder 63 consisting of an outer cylinder 61 and an inner cylinder 62 is attached to the rear opening of the heat exchanger 60.

That is, the combustion tube 63 is attached by connecting the flange 61a provided at the lower end of the outer tube 61 to the upper wall of the heat exchanger 60.

A combustion chamber 64 is formed within the inner cylinder 62, and a fuel injection nozzle 65 is attached to a rear portion of the combustion chamber 64.

Further, a spark plug 66 is provided at the tip of the fuel injection nozzle 65.
is installed.

Further, the outer cylinder 61 has an open rear portion and communicates with a blowing cylinder 67 that communicates with the blowing fan 59 .

On the other hand, the inner cylinder 62 has a large number of primary air inflow holes 69 on its rear end plate 6, and also forms an annular air inflow space 70 between it and the outer cylinder 61. A flame stabilizer 72 provided with a large number of secondary air inflow holes 71 is arranged in series.

With this configuration, combustion air generated by driving the air supply fan 59 flows into the outer cylinder 61 and is then divided into secondary combustion air and secondary combustion air, and is then distributed inside the inner cylinder 62 and into the flame stabilizer 72. It will flow inside.

Then, the fuel can be ejected in an atomized state from the fuel injection nozzle 65 and ignited by the spark plug 66 to perform combustion.

Further, a damper device 73 is provided in the middle of the feed cylinder 67, and by driving the damper device 73, the amount of air flowing into the combustion cylinder 63 can be adjusted.

(c) Problems to be Solved by the Invention However, such gun-type burner devices had the following problems to be solved.

That is, since a single damper device 73 is provided in the middle of the feed cylinder 67 and the overall air volume is adjusted by the damper device 73, an appropriate amount of air can be sent to each air flow path depending on the combustion state. Can not do it.

Therefore, for example, focusing on noise prevention during maximum combustion, as shown in FIG. 9, the ratio between the air amount Q of the secondary combustion air and the air amount Q□ of the secondary combustion air is set as 2
: If set to 1, that ratio will be taken even during minimum combustion, and so-called smoke will occur during minimum combustion.

Note that the damper device 73 is composed of damper plates that can be operated separately and independently, and the feed cylinder 67 on the downstream side thereof
It is also conceivable to divide the interior into a plurality of flow paths using partition plates, and to flow into the combustion cylinder 63 through each flow path.

However, in this case, it is necessary to provide a plurality of partition plates in the blower cylinder 67, which complicates the structure, increases manufacturing costs, and increases air resistance (and makes it difficult to adjust the air volume).

An object of the present invention is to provide a novel gun-type burner device that can solve the above problems.

(d) Means for Solving the Problems The present invention connects the front part of a cylindrical burner body to the inlet side of a heat exchanger, forms a combustion chamber within the cylindrical burner body, and forms a combustion chamber in the cylindrical burner body. Form multiple air flow paths that connect to This invention relates to a gun-type burner device characterized in that it is provided with a damper device for switching air flow paths that communicates with each air flow path.

The present invention also provides an air flow path switching damper device that is fixed to the rear part of the cylindrical burner body, and has a secondary air inflow hole and a secondary air inflow hole, respectively.
A fixed plate having a fixed side through hole that communicates with the annular secondary air flow path and a tertiary air flow path, respectively, and a movable side through hole that is slidably and rotatably attached to the fixed plate and can be aligned with the fixed side through hole. It is also characterized by comprising a movable plate and a rotary motor such as a geared motor that rotates the movable plate.

(E) Actions and Effects With the above-described configuration, the present invention provides the following actions and effects.

■ In the present invention, an air flow switching damper device is provided behind the plurality of air flow paths that communicate with the same combustion chamber, so by driving the damper device, an appropriate amount of air can be distributed to each flow path. can be sent. Therefore, for example, during maximum combustion, the amount of secondary air and the amount of secondary air are set to Q, :Q, = 2: 1 for the purpose of noise prevention, and at the time of minimum combustion, the purpose is to prevent smoke generation. As, the amount of negative air and the amount of secondary air are Q+
:Ql −1: Can be set to l.

■ In the present invention, the damper device for switching the air flow path is provided at the connection part between the cylindrical burner body and the sending cylinder, so the damper device for switching the air flow path is located immediately behind the cylindrical burner body. This eliminates the need to form multiple air guide channels using a partition plate or the like between the air flow path switching damper device and the cylindrical burner body, thus simplifying the duct configuration. It can be manufactured at low cost, and the fluid resistance can be reduced, making it easy to adjust the air volume.
Stable combustion control becomes possible.

■ In the present invention, the damper device for switching the air flow path is fixed to the rear part of the cylindrical burner body, and
A fixed plate having a fixed side through hole that communicates with the annular secondary air flow path and a tertiary air flow path, respectively, and a movable side through hole that is slidably and rotatably attached to the fixed plate and can be aligned with the fixed side through hole. It consists of a movable plate and a rotary motor that rotates the movable plate.

Therefore, it can be compactly incorporated into the feed cylinder, and the required amount of air can be accurately supplied to a plurality of flow paths, and the combustion state can be accurately controlled.

(f) Example The following is an example of the present invention shown in the accompanying drawings.

I will explain in detail.

FIG. 1 shows the overall configuration of an oil water heater B equipped with a gun type burner device A according to the present invention.

As shown in the figure, the petroleum water heater B includes a heat exchanger 11, a gun type burner device A connected to the upper end of the heat exchanger 11, and a gun type burner device WIA in a casing IO.
It is constructed by disposing an air supply fan 13 connected to the heat exchanger via a supply cylinder 12, and exhaust ducts 14 and 15 connected to the lower end of the heat exchanger.

Fig. 2 shows a gun type burner device 1A which constitutes the main part of the present invention.
The overall configuration is shown.

As shown in FIG. 2, the cylindrical burner body 20 interposed between the heat exchanger 11 and the feed cylinder 12 has a fuel injection nozzle 22 and a spark plug 23 that inject fuel downward into the combustion chamber 21. The primary outer cylinder 25 and the secondary outer cylinder 26 are arranged concentrically in layers around the inner cylinder 24.

The inner cylinder 24 also has a flame stabilizing cylinder 27 forming its front part, and a secondary air inflow guide cylinder 28 at its rear part.
are arranged in series, and a large number of primary air inflow holes 30 are provided in the rear end plate 29 thereof.

Then, the secondary air is introduced into the combustion chamber 12 from the feed cylinder 12 through the secondary air inflow guide tube 28 and the secondary air inflow hole 30.
It can be supplied within 1 minute.

On the other hand, an annular secondary air flow path 31 is formed between the inner cylinder 24 and the primary outer cylinder 25, and the annular secondary air flow path 31 is formed in a plurality of holes provided on the circumferential surface of the flame stabilizing cylinder 27. The combustion chamber 2 formed in the flame stabilizing tube 27 through the secondary air inflow hole 32 of
I am in contact with 1.

With this configuration, secondary air can be supplied from the feed cylinder 12 into the combustion chamber 21 through the annular secondary air flow path 31 and the secondary air inflow hole 32.

Further, a tertiary air flow path 33 is formed between the -thickness outer 1i 25 and the secondary outer cylinder 26, and the tip opening of the tertiary air 33 communicates with the internal space 34 of the heat exchanger 11. .

Furthermore, as shown in FIG. 2, an air flow path switching damper device C is provided at the connection between the cylindrical burner body 20 and the sending cylinder 12.

As shown in FIG. 3, the air flow switching damper device C allows the above-described air quantities Q1 of primary air, secondary air, and tertiary air to be adjusted in proportion to the required heat load. Qt,
Q- can be adjusted.

That is, as shown in FIG. 3, at the time of maximum combustion, that is, at the maximum required heat load, the damper device C for switching the air flow path is driven, and the air flow inside the secondary air inflow guide cylinder 28 and the secondary air flow path 31 is controlled. flows into.

Thereafter, as the heat demand load is reduced, the secondary air amount Q and the secondary air amount Q8 are proportionally reduced, and the tertiary air amount Q is increased.

Then, at the minimum combustion time, that is, at the minimum heat demand load, -
The secondary air amount Q and the secondary air amount Q8 are set to the minimum amount, and the tertiary air amount Q is set to the maximum amount.

By driving the air flow switching damper device C in this way, the air amounts Q, , Q, , Qs of primary air, secondary air, and tertiary air can be easily adjusted to achieve the desired combustion state. Obtainable.

■ Also, the amount of air Q of secondary air, secondary air, and tertiary air
. Since the air volume can be adjusted without any changes, there is little change in the air volume due to wind pressure, and stable combustion control can be performed.

■ Also, the air ff1Q, which is negative air and secondary air.

The ratio of Q, at maximum combustion (maximum required heat load), is
, :Q = 2:1, and during minimum combustion (minimum required heat load), set Q+:Qz = 1:l to prevent noise generation as much as possible during maximum combustion. At the same time, during minimum combustion, the generation of soot or smoke can be reduced as much as possible.

In this embodiment, since the damper device C for switching the air flow path is disposed at the connection part between the cylindrical burner main body 20 and the sending cylinder 12, the damper device C for switching the air flow path is connected to the cylindrical burner main body 20. Since the damper device C for switching the air flow path and the cylindrical burner body 20 are located directly behind the cylindrical burner body 20, it is possible to eliminate the need for a plurality of air guide flow paths.

Therefore, the duct structure can be made into a cylindrical structure and can be manufactured at low cost.

■Furthermore, in this embodiment, tertiary air can flow into the heat exchanger 11 as dilution air during the minimum combustion period, which effectively reduces the relative humidity of the exhaust gas and prevents the formation of dew condensation. Corrosion of the water heater main body of the petroleum water heater B can be effectively prevented.

This embodiment is also characterized in that the above-mentioned damper device C for air flow path switching has the following configuration.

That is, as shown in FIG. 2, the air flow path switching damper device C includes a disk-shaped fixing plate 40 integrally formed at the rear of the cylindrical burner main body 20, and a rear surface of the fixing plate 40. It is composed of a disc-shaped movable plate 41 that is slidably and rotatably arranged in an overlapping state, and a rotary motor 42 such as a geared motor that rotates the movable plate 41 with respect to the fixed plate 40.

Further, the planar shapes of the fixed plate 40 and the rotating plate 41 are shown in FIGS. 4 and 5. FIG.

As shown in the figure, the fixed plate 40 is provided with a plurality of fan-shaped (approximately 174 arcs) fixed side through holes 40a, 40b, and 40c point-symmetrically arranged at positions facing each other by 180 degrees. , 40b, 40c are the second air guide channels 28., 40b, 40c, respectively. It communicates with the secondary air flow path 31 and the tertiary air flow path 33.

These fixed side through holes 40a, 40b, 40c
The width is gradually narrowed from the center to the outer edge while keeping the circumferential angle the same.

On the other hand, the movable plate 41 is at a position facing 180°,
A plurality of irregularly shaped movable side through holes 41a are point symmetrical.

41b and 41c are provided.

That is, the movable side through-holes 41a and 41b are located in the same radial direction, respectively, and consist of a short wide circular arc portion and a long narrow circular arc portion.

On the other hand, the movable side passage hole 41c is the movable side through hole 41a described above.
, 41b at approximately 90° orthogonal positions in the circumferential direction.

With this configuration, by driving the rotary motor 42,
At maximum combustion, the movable plate 41 and the fixed plate 40
6, the relative rotational position shown in FIG. 6 can be adopted.

Then, as shown in FIG. 3, -order air IQ.

and secondary air IQ are at their maximum amounts, the combustion chamber 21 is
Combustion air can flow into the chamber.

Furthermore, by driving the rotary motor 42, the seventh
The relative rotational position shown in the figure can be taken.

Then, as shown in FIG. 3, the -water air inflow guide tube 28 and the secondary air Channel 3
Combustion air can flow into the combustion chamber 21 through the heat exchanger HI3, and dilution air for preventing condensation can flow into the heat exchanger HI3.

In addition, as shown in Figures 4 and 5, fixed play) 4
Fixed side through holes 40a, 40 provided in 0 and movable play) 41
b, 40c and the movable side through-holes 41a, 41b, 41c have a unique shape, as shown in FIG. The air Q can be controlled proportionally, and combustion control can be performed accurately and easily.

Furthermore, such an air flow path switching damper device C includes a fixed plate 4 with holes fixed to the rear part of the cylindrical burner body 20.
0, a movable plate 41 with holes that is slidably and rotatably attached to the fixed plate 40, and a rotary motor 42 that rotates the movable plate, so it can be compactly installed inside the feed cylinder 12. can be incorporated into.

Moreover, by using the rotary motor 42 as a geared motor, a large reduction ratio can be achieved while maintaining a compact shape, so that precise air volume control can be performed.

In addition, to explain other configurations in the illustrated embodiment, as shown in FIG. 2, the fuel injection nozzle 22 uses a return type pressure spray nozzle, so
0 and a return oil pipe 51 are connected to the fuel injection nozzle 22.

Further, in FIG. 2, the flame stabilizing cylinder 27 has a stirring plate 53 attached to its tip, which can promote diffusion of combustion air and improve the heat exchange rate within the heat exchanger 11.

In addition, in FIG. 2, the rotating shaft 55 of the movable plate 41 connected to the output shaft 54 of the rotating motor 42 is rotatably supported by a bearing 56, and the bearing 56 is mounted in a retaining ring 57. It is attached to the center of the fixed rib 58.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view of an oil water heater equipped with a gun type burner device according to the present invention, Fig. 2 is an explanatory diagram of the internal configuration of the gun type burner device, and Fig. 3 is the relationship between required heat load and air volume. FIG. 4 is a front view of a fixed plate constituting a damper device for switching air flow paths, and FIG. 5 is a front view of a movable plate constituting a damper device for switching air flow paths.
6 and 7 are explanatory diagrams showing the relative rotational position of the movable plate with respect to the fixed plate during maximum combustion and minimum combustion, FIG. 8 is an explanatory diagram of the internal configuration of a conventional gun type burner device, and FIG. 9 is a graph showing the relationship between the required heat load and the air volume in the same gun type burner device. In the figure, A: Gun type burner device B: Petroleum water heater C: Air flow switching damper device I: Heat exchanger 12: Power transmission tube 13: Air supply fan 20: Cylindrical burner body 21: Combustion chamber 22: Fuel injection nozzle 23: Spark plug 24: Inner cylinder 25, primary outer cylinder 26: Secondary outer cylinder 30, primary air inflow hole 31: Secondary air flow path 32: Secondary air inflow hole 33: Tertiary air flow path 40: Fixed plates 40a, 40b, 40c: Fixed side through hole 41: Movable plate 41a, 41b, 41c: Movable side through hole 42: Rotating motor

Claims (1)

[Claims] 1. Connecting the front part of the cylindrical burner body to the inlet side of the heat exchanger, forming a combustion chamber within the cylindrical burner body, and
A plurality of air passages are formed that communicate with the combustion chamber, one end of which is connected to an air supply fan, the other end of which is connected to the rear of the cylindrical burner body, and the other end of which is connected to the air supply fan. A gun-type burner device characterized by being provided with an air flow switching damper device that selectively connects a cylinder to each air flow path. 2. The damper device for switching the air flow path is fixed to the rear part of the cylindrical burner body, and includes a fixed plate having fixed-side through holes each communicating with a plurality of air flow paths provided in the cylindrical burner body. The gun according to claim 1, comprising a movable plate that is slidably and rotatably attached to the fixed plate and has a movable side through-hole that can be aligned with the fixed side through-hole, and a rotary motor that rotates the movable plate. type burner device.