JP3100362B2 - Spray combustion burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray combustion type burner, and more particularly to a burner in which a swirling flow is generated in a combustion cylinder by the action of a stabilizer at the bottom of the combustion cylinder.

[0002]

2. Description of the Related Art Conventionally, at a central opening of a stabilizer constituting a bottom portion of a combustion cylinder, a spray nozzle and an electrode rod are placed in a primary air chamber formed adjacent to the combustion cylinder so as to communicate with the combustion cylinder. Along with disposing as desired in the mouth, a tapered partition plate having an opening in the center is disposed on the rear side of the stabilizer so that the opening is aligned with the center opening, and between the partition plate and the stabilizer. ,
A secondary air chamber having a passage width narrowing toward the center is formed, and the secondary air introduced through an inlet at the outer peripheral portion of the secondary air chamber is guided and rectified by the function of the partition plate while passing therethrough. 2. Description of the Related Art A spray combustion type burner is known in which a flow is caused to flow out of a hole into a combustion cylinder and a swirling flow is generated in the combustion cylinder by the action of the swirling blade.

FIG. 5 shows an example. In the figure, reference numeral 200 denotes a cylinder 206 adjacent to a combustion cylinder 202.
The primary air chamber formed inside the inside
08 and the electrode rod 210 are accommodated. Here, the spray nozzle 208 and the electrode rod 210 are attached to and held by a common holder 212.

A plurality of primary air holes 214 are formed in the outer peripheral wall of the primary air chamber 200, that is, in the cylindrical body 206 constituting the outer peripheral wall in this example, at a uniform pitch in the circumferential direction, and are sent out from the blower. The air that has reached the outside of the cylindrical body 206 flows through the primary air holes 214 through the primary air chamber 200.
And a primary air flow is generated in the primary air chamber 200 in the axial direction. Under the primary air flow, fuel is sprayed from the spray nozzle 208 through the central port 215 into the combustion tube 202. At the same time, an arc is emitted from the electrode rod 210, so that fuel is ignited.

Reference numeral 216 denotes a stabilizer constituting the bottom of the combustion tube 202. A plurality of passage holes 218 for passing secondary air around the center opening 215, and a diagonal edge from the edge of the passage hole 218. The plurality of swirling vanes 220 in a standing state are radially connected to the central port 215 continuously to the central port 215.
5 around the cylindrical body 206 at the partition plate 222.
The secondary air from the secondary air chamber 224 defined inside and between the primary air chamber 200 and the combustion cylinder 202 flows into the combustion cylinder 202 through the plurality of passage holes 218 and the swirl vanes 220 The swirling flow is generated in the combustion cylinder 202 by the action of

In this example, the outer peripheral wall of the secondary air chamber 224 is constituted by a cylinder 206, and the cylinder 20
6, a plurality of secondary air holes 225 as inlets for secondary air are formed at a uniform pitch in the circumferential direction, and the air sent from the blower passes through the secondary air holes 225 through the secondary air chambers 224. The gas flows into the combustion cylinder 202 through the interior and further through the stabilizer 216.

That is, in the case of the spray combustion type burner of this example, the air sent from the blower is distributed to the primary air chamber 200 and the secondary air chamber 224 through the primary air hole 214 and the secondary air hole 225. The fuel is supplied and made to flow into the combustion cylinder 202. The combustion cylinder 202 is provided with a tertiary air hole 226 that allows a part of the air sent from the blower to flow into the combustion cylinder 202.

In the case of a burner of a variable combustion amount type, it is necessary to suppress the air flow near the spray nozzle 208 and the electrode rod 210 in order to secure stable combustion in the entire combustion range. On the other hand, in order to secure stable ignition performance at the time of ignition, the spray nozzle 208 and the electrode rod 2 are required.
It is required to generate a predetermined amount of air flow in the vicinity of 10.

By generating a predetermined amount of air flow in the vicinity of the spray nozzle 208 and the electrode rod 210, the electrode rod 210 is formed.
The arc from the fuel can be extended into the combustion cylinder 202 for a long time, and the fuel sprayed into the combustion cylinder 202 can be satisfactorily ignited.

Therefore, in the burner of this example, the primary air chamber 2
00 and a secondary air chamber 224 are formed respectively, and the air sent from the blower is distributed from a primary air hole 214 and a secondary air hole 225 to form a primary air chamber 200 and a secondary air chamber 224. And the distribution ratio is increased toward the secondary air chamber 224, so that the stability of combustion is impaired due to the flow of primary air guided into the primary air chamber 200 during normal combustion. To avoid as much as possible.

FIG. 6 is an enlarged view of the stabilizer 216 and its peripheral portion. As shown in the figure, in this example, the partition plate 222 also serves as a front wall of the primary air chamber 200. Therefore, the partition plate 222 has a tapered shape as a whole and has a circular shape at the center. An opening 227 is provided on the rear side of the stabilizer 216 so that the opening 227 is aligned with the center opening 215, and the width of the passage is narrowed toward the center between the stabilizer 216 and the stabilizer 216. A secondary air chamber 224 is formed.

The outer peripheral surface of the secondary air chamber 224 is
6 and the secondary air chamber 2 is
24, the outer peripheral wall of which is formed with a large number of secondary air holes 225 as inlets for the secondary air, and the air sent from the blower receives the secondary air holes. 225 is introduced into the secondary air chamber 224. Thus, the secondary air introduced through the secondary air holes 225 passes through the through holes 218 of the stabilizer 216 while increasing the flow velocity toward the center by the guiding action (rectifying action) of the partition plate 222, and the combustion tube The fluid flows out into the inside 202 and is swirled by the action of the swirling blade 220.

[0013]

As shown in FIG. 6, in the case of a conventional burner of this type, the diameter of the opening 227 at the center of the partition plate 222 also serving as a rectifying plate is set at the center of the stabilizer 216. The diameter of the opening 227 is the same as the diameter of the opening 215, and the edges of the opening 227 and the center opening 215 coincide with each other. This causes the following inconvenience.

That is, the secondary air hole 225 is
The secondary air that has entered the inside 24 flows toward the center while increasing the flow velocity as the passage width decreases, and a part of the secondary air flows into the partition plate 22.
2 and the stabilizer 216, specifically, the swirl vanes 22
The secondary air flow that flows toward the center port 215 from between 0 and hits the center port 215 hits and disturbs the arc P from the electrode rod 210, thereby impairing the ignition performance.

[0015] This is because the ejection position of the secondary air flow toward the central port 215 is located near the electrode rod 210, and the secondary air flow from the secondary air chamber 224 is directed toward the center of the central port 215. Outflow in the radial direction.

[0016]

The invention of the present application has been made to solve such a problem. Thus, the spray combustion type burner of the present invention is a member constituting a bottom portion of a combustion cylinder, and is provided for passing a central port and secondary air radially formed around the central port continuously to the central port. Forming a primary air chamber adjacent to the combustion cylinder in a state communicating with the combustion cylinder at the center port of the stabilizer including the hole and the swirling vane rising up from the edge of the passage hole; A spray nozzle and an electrode rod are disposed in the room such that their tips face the central port, and a tapered partition plate having an opening in the center is provided on the rear side of the stabilizer and the opening is connected to the central port. A secondary air chamber is formed between the partition plate and the stabilizer so that the width of the passage decreases toward the center, and the introduction of the outer peripheral portion of the secondary air chamber is performed. Guide the secondary air introduced through the mouth by the action of the partition plate and In a spray combustion type burner which is caused to flow out of the passage hole into the combustion cylinder while flowing and to generate a swirling flow in the combustion cylinder by the action of the swirling blade, the opening diameter of the partition wall plate is set to the central port of the stabilizer. The diameter of the opening is larger than the diameter of the central opening, and the edge of the opening is located at a position which is drawn toward the outer peripheral side from the edge of the central opening.

[0017]

As described above, according to the present invention, the diameter of the opening of the partition plate is made larger than the diameter of the center opening of the stabilizer, and the edge of the opening is located closer to the outer periphery than the edge of the center opening. It is located at the position where it is drawn into. In this manner, the position of the secondary air flow that is inwardly directed in the radial direction can be moved away from the arc, whereby the flow velocity of the secondary air flow toward the arc is reduced, and adverse effects on the arc are reduced. In addition, the secondary air flow heading radially inward due to the slow flow velocity is changed in its direction toward the combustion cylinder by the primary air flow passing axially through the center port,
This also reduces the adverse effect on the arc. As a result, the arc becomes stable, and the ignition performance is improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes an oil water heater, and a burner (gun type burner) 14 is provided inside a housing 12.
have. Reference numeral 16 denotes a water supply port in the oil hot water heater 10, and reference numeral 18 denotes a tap hole.

A flow sensor 22, a water supply thermistor 24, and a water amount control valve 26 are provided on a pipe 20 following the water supply port 16, and mixing is performed on a pipe 30 from the heat exchanger 28 to the tap 18. A tank 32 and an overpressure relief valve 34 are provided. The heat exchanger 28 is provided with a heat exchanger thermistor 36. Reference numeral 38 denotes a drain plug.

Numeral 40 denotes a combustion chamber. Water supplied through the pipe 20 is heated by the heat exchange action of the heat exchanger 28 and heat of combustion in the combustion chamber 40, and is turned into hot water.
Hot water is supplied from the tap 18. Reference numeral 42 denotes an exhaust port.

As shown in FIG. 2, the burner 14 includes a blower 44 for supplying air, a fuel pump 46 for delivering fuel (oil fuel), an electromagnetic valve 48, a spray nozzle 50, an electrode rod 52, An igniter 54 is provided, and the fuel delivered by the fuel pump 46 is sprayed from a spray nozzle 50 and burned.

Here, the fuel pump 46 is of a variable discharge pressure type, that is, capable of continuously changing the supply amount of fuel. That is, the burner 14 of this example is a burner whose combustion amount is variable. 56 (see FIG. 1) is an oil strainer, 58 is a flame detector (CdS), and 60 is a controller for controlling various operations.

FIG. 3 is an enlarged view of a main part of the burner 14. In the figure, reference numeral 62 denotes a primary air chamber formed inside the cylinder 68 adjacent to the combustion cylinder 64, and houses therein the spray nozzle 50 and the pair of electrode rods 52. Here, the spray nozzle 50 and the electrode rod 52 share the common holder 7.
0 and held.

A plurality of primary air holes 74 are formed in the outer peripheral wall 72 of the primary air chamber 62, that is, the cylinder 68 at a uniform pitch in the circumferential direction.
8 Outside air is introduced into the primary air chamber 62 through the primary air holes 74, and an axial primary air flow is generated in the primary air chamber 62, and under the primary air flow, The fuel is sprayed from the spray nozzle 50 into the combustion cylinder 64 through the center port 78, and the arc P (see FIG. 4) is discharged from the electrode rod 52, whereby the fuel is ignited.

Reference numeral 76 denotes a stabilizer constituting the bottom of the combustion tube 64. A plurality of passage holes 80 for passing secondary air around the center opening 78, and a slanted portion from the edge of the passage hole 80. It has a plurality of swirling vanes 82 in an upright form, and is provided with a partition plate 84 from a secondary air chamber 86 defined inside the cylinder 68 and between the primary air chamber 62 and the combustion cylinder 64. Secondary air is caused to flow into the combustion cylinder 64 through the plurality of passage holes 80, and a swirling flow is generated in the combustion cylinder 64 by the action of the swirler vanes 82.

The outer peripheral wall 88 of the secondary air chamber 86, that is, the cylindrical body 68 is further provided with a secondary air hole 9 as an inlet for secondary air.
0 are formed at a uniform pitch in the circumferential direction and more than the primary air holes 74, and the air sent from the blower 44 flows into the secondary air chamber 86 through the secondary air holes 90 and further to the stabilizer. It passes through 76 and flows into the combustion cylinder 64.

That is, in the case of the spray combustion type burner 14 of this example, the air sent from the blower 44 is
The air is distributed and supplied to the primary air chamber 62 and the secondary air chamber 86 through the fourth air hole 4 and the secondary air hole 90, and flows into the combustion cylinder 64. Note that a tertiary air hole 93 is formed in the outer peripheral wall 92 of the combustion cylinder 64 to allow a part of the sent air to flow into the combustion cylinder 64.

An ignition air hole 94 is formed in an outer peripheral wall 72 of the primary air chamber 62. This ignition air hole 94
Is located in front of the primary air hole 74 and directly above the pair of electrode rods 52, strictly speaking, at a position immediately adjacent to the pair of electrode rods 52 in the direction perpendicular to the axis and at an intermediate position between the pair of electrode rods 52, Only one is formed.

In the case of the burner of this embodiment, the air sent from the blower 44 and reaching the outside of the cylinder 68 is supplied to the primary air holes 74,
The air is distributed and introduced into the primary air chamber 62 and the secondary air chamber 86 through the secondary air holes 90, respectively. Then, the air guided into the primary air chamber 62 generates an axial primary air flow toward the combustion cylinder 64, and the fuel is sprayed from the spray nozzle 50 into the combustion cylinder 64 under the primary air flow. At the same time, the arc P is discharged from the electrode rod 52 to ignite the fuel.

The air that has flowed into the secondary air chamber 86 passes through the stabilizer 76 and flows into the combustion cylinder 64. At this time, a swirling flow is generated in the combustion cylinder 64 by the action of the swirling vanes 82. The fuel sprayed on the basis of the swirling flow and the air are uniformly and well mixed, and the combustion is performed. still,
The remaining part of the air sent from the blower 44 flows into the combustion cylinder 64 through the tertiary air holes 93 of the combustion cylinder 64.

In the burner 14 of this embodiment, the partition plate 84 also serves as the front wall of the primary air chamber 62 as shown in an enlarged view in FIG. It is tapered and has a circular opening 96 at the center. The diameter of the opening 96 is larger than the diameter of the center port 78 of the stabilizer 76, and the edge of the opening 96 is located closer to the outer periphery than the edge of the center port 78 as shown in FIG. It is located at a position retracted by a distance d (d = 0.5 to 2.0 mm, preferably 1.0 to 1.5 mm). The partition plate 84 forms a secondary air chamber 86 in which the passage width becomes narrower toward the center.

The outer peripheral surface of the secondary air chamber 86 is closed by a cylinder 68, which forms an outer peripheral wall 88 of the secondary air chamber 86. Are secondary air holes 90 as inlets for the large number of secondary air.
Is formed, and the air sent from the blower 44 is introduced into the secondary air chamber 86 through the secondary air holes 90.

The secondary air introduced through the secondary air holes 90 is guided by the partitioning plate 84 (rectifying action) to increase the flow velocity toward the center while increasing the flow rate of the stabilizer 76.
Through the through hole 80, and flows out into the combustion cylinder 64, and is swirled by the action of the swirling blade 82.

In the case of the burner 14 of the present embodiment, since the edge of the opening 96 of the partition plate 84 is located at a position which is drawn outward from the edge of the center opening 78 of the stabilizer 76, the radius from the secondary air chamber 86. The ejection position of the secondary air flow inward in the direction is far from the arc P, and therefore, the flow velocity of the secondary air flow inward in the radial direction is reduced, and the adverse effect on the arc P is reduced. In addition, the slower flow velocity causes the secondary air flow directed inward in the radial direction to change its direction toward the combustion cylinder 64 due to the primary air flow passing axially through the center port 78, which also causes the arc. The adverse effect on P is reduced. As a result, the arc P becomes stable,
As a result, the ignition performance is improved.

The embodiment of the present invention has been described in detail above, but this is merely an example. For example, in the above example, the tapered partition wall plate 84 is configured to also serve as the front wall of the primary air chamber 62, but the partition wall for forming the front wall of the primary air chamber 62 and the secondary air chamber 86. The plate 84 and the plate 84 can be formed separately.

In the above example, the outer peripheral wall 72 of the primary air chamber 62 is provided.
Is closed by a cylindrical body 68, and a secondary air hole 90 as an inlet for secondary air is formed in an outer peripheral wall 88 of a secondary air chamber 86 formed by a part of the cylindrical body 68. However, it is possible in some cases that the outer peripheral portion of the secondary air chamber 86 is formed in an open shape, and the entire open portion is used as a secondary air inlet. Further, the present example can be applied to burners of various different forms other than the above example, and can be configured in various modified forms without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an oil water heater including a burner according to one embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a burner in FIG. 1;

FIG. 3 is an enlarged view showing a main part of the burner in FIG. 2;

FIG. 4 is an explanatory view of the operation of the burner shown in FIGS. 2 and 3;

FIG. 5 is a diagram showing a main part of an example of a conventional burner.

FIG. 6 is an explanatory diagram of a defect of the burner in FIG. 5;

DESCRIPTION OF SYMBOLS 14 Burner 50 Spray nozzle 52 Electrode rod 62 Primary air chamber 64 Combustion cylinder 76 Stabilizer 78 Central port 80 Passage hole 82 Swirling vane 84 Partition plate 86 Secondary air chamber 88, 92 Outer peripheral wall 96 Opening

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23D 11/24

Claims (1)

(57) [Claims] 1. A member constituting a bottom of a combustion cylinder,
In the center opening of the stabilizer including a center opening, a secondary air passage hole formed radially around the center opening, and a swirling vane standing obliquely from an edge of the passage opening. A primary air chamber is formed adjacent to the combustion cylinder in a state communicating with the inside of the combustion cylinder, and a spray nozzle and an electrode rod are arranged in the primary air chamber such that their tips face the central port. A taper-shaped partition plate having an opening at the center thereof is disposed at the rear side of the stabilizer and the opening is aligned with the center port, and between the partition plate and the stabilizer, facing the center direction. To form a secondary air chamber having a narrow passage width, and guide and rectify the secondary air introduced through an inlet at an outer peripheral portion of the secondary air chamber by the action of the partition plate, and burn the secondary air from the passage hole. Released into the cylinder and burned by the action of the swirl vanes In the spray-burning type burner adapted to generate a swirling flow therein, the opening diameter of the partition plate is made larger than the diameter of the center opening of the stabilizer, and the edge of the opening is made the edge of the center opening. A spray combustion type burner, wherein the burner is located at a position retracted further to the outer peripheral side.