JP7141574B1 - Blower burner device - Google Patents

Abstract

A blast burner device capable of cooling a three-phase motor without separately providing cooling means such as an external fan is provided. A blower burner device (100) includes a blower (10) for compressing and blowing air, and a gas burner (80) for burning a mixture of compressed air and fuel blown from the blower (10) to generate flame. The blower 10 includes a three-phase motor M that supports a fan F1 on an axis A, a case 21 that houses the three-phase motor M, and a case 11 that houses the fan F1. The fan F1 is provided at a predetermined distance T from the three-phase motor M. The case 21 is provided with a first vent 28 through which air flows and an inflow hole 29 through which fuel flows. The case 11 is provided with a second vent 12 through which fuel gas and compressed air flow. A three-phase motor M is positioned between the first vent 28 and the fan F1. [Selection drawing] Fig. 1

Description

The present invention relates to a blast burner device comprising a burner for burning a mixture of fuel and air to generate a flame.

Conventionally, a burner that burns a mixture of fuel and air to generate a flame is widely known. The fuel is, for example, liquefied natural gas. For example, as shown in FIGS. 15(a), 15(b) and 15(c), Patent Literature 1 discloses a gas burner 3 that combusts mixed gas blown from a blower 1 to generate flame.
FIG. 15(a) is a schematic diagram showing the connection relationship between the gas burner 3 and the blower 1 according to Patent Document 1. FIG. FIG. 15(b) is a cross-sectional view of the gas burner 3 shown in FIG. 15(a). FIG. 15(c) is a horizontal sectional view of the gas burner 3 shown in FIG. 15(a).

15(a), (b), and (c) disclose a blower 1, a mixer 2, a gas burner 3, an outer case 4, a secondary air pipe 5, a premixed gas pipe 6, a flame hole 7, and a premixed gas pipe 8. is doing. Open arrows indicate secondary air flow and hatched arrows indicate flame. A blower 1 is connected to a gas burner 3 via a mixer 2 and a premixed gas pipe 8 . In the gas burner 3, a premixed gas pipe 6 having a laterally elongated structure is provided in an outer casing 4, and a plurality of flame holes 7 are provided in a row in the premixed gas pipe 6. - 特許庁

Air and fuel gas blown from the blower 1 flow into the mixer 2 and are mixed in the mixer 2 . A mixed gas preliminarily adjusted to an air ratio of about 0.6 by the mixer 2 is introduced into the premixed gas pipe 6 from the premixed pipe 8 . After igniting according to the ignition sequence, flames are ejected from a plurality of flame holes 7 .

Japanese Patent Application Laid-Open No. 2001-201014

In conventional burners including the gas burner 3, combustion in which the ejection speed of combustion gas from the flame hole is 80 m/s or more is classified as "high-speed combustion". To achieve this "high speed combustion", conventional blowers, including blower 1, require the fan to rotate at high speed. A three-phase motor is used as a drive source for the fan that rotates at high speed.

However, the three-phase motor heats up to a high temperature by rotating the fan at high speed. Therefore, the three-phase motor needs to be separately provided with cooling means such as an external fan.

Therefore, conventional burners and blowers have a large number of parts and a high manufacturing cost in order to achieve "high speed combustion". Also, the rotation of the external fan is a source of noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blower burner device capable of cooling a three-phase motor without separately providing cooling means such as an external fan.

The blast burner device of the present invention has the following means in order to achieve the above objects.

(1) The blower burner device of the present invention has a housing provided with a first ventilation hole and a second ventilation hole through which air flows, and a three-phase motor housed in the housing and rotating a fan. a blower that compresses the air that has flowed into the housing by rotating the fan and blows the air from the second ventilation hole;
a burner connected to the second vent.

A three-phase motor is positioned between the first vent and the fan.

The housing is provided with an inflow hole through which fuel flows, the outlet of the inflow hole is located between the fan and the three-phase motor and faces the fan, and the blower receives the fuel and compressed air flowing in from the inflow hole. is blown into the burner through the second ventilation hole. The burner then combusts the mixture to generate flame.

In this configuration, when the fan rotates, the air that has flowed in through the first ventilation hole passes through the three-phase motor and is sucked into the fan. That is, by housing the three-phase motor in the housing, air flows from the first air hole toward the fan via the three-phase motor. Therefore, according to the present invention, the heat-generating three-phase motor can be cooled by air without separately providing cooling means such as an external fan. Further, since the rotation of the external fan is eliminated and the three-phase motor is accommodated in the housing, noise caused by the three-phase motor can be greatly suppressed. Moreover, in this configuration, the fuel that has flowed in through the inflow hole is directly sucked into the fan without passing through the three-phase motor. That is, the only gas that passes through the three-phase motor is air. Therefore, it is possible to prevent the fuel from adhering to the three-phase motor.

(2) The housing has an adjuster that adjusts the amount of opening of the first vent.

This configuration can adjust the amount of air flowing in from the first vent. Thereby, the ratio of air to fuel gas (air ratio) can be adjusted.

The present invention can cool a three-phase motor without separately providing cooling means such as an external fan.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the ventilation burner apparatus 100 regarding 1st Embodiment of this invention. 2 is an external perspective view of the blast burner device 100 shown in FIG. 1. FIG. 2 is an external perspective view of the inside of the blower burner device 100 shown in FIG. 1. FIG. Fig. 2 is an external perspective view showing an enlarged main part of the blower burner device 100 shown in Fig. 1; It is a side view of the ventilation burner apparatus 100 shown in FIG. It is a front view of the ventilation burner apparatus 100 shown in FIG. It is a rear view of the ventilation burner apparatus 100 shown in FIG. FIG. 8 is a cross-sectional view taken along line S-S shown in FIG. 7; 2 is a block diagram showing the configuration of each part provided in the blast burner device 100 shown in FIG. 1. FIG. FIG. 9 is a sectional view taken along line S-S when the three-phase motor M shown in FIG. 8 is driven to rotate the fan F1; It is the schematic of the ventilation burner apparatus 200 regarding 2nd Embodiment of this invention. It is the schematic of the ventilation burner apparatus 300 regarding 3rd Embodiment of this invention. It is the schematic of the ventilation burner apparatus 400 regarding 4th Embodiment of this invention. It is the schematic of the ventilation burner apparatus 500 regarding 5th Embodiment of this invention. FIG. 15(a) is a schematic diagram showing the connection relationship between the gas burner 3 and the blower 1 according to Patent Document 1. FIG. FIG. 15(b) is a cross-sectional view of the gas burner 3 shown in FIG. 15(a). FIG. 15(c) is a horizontal sectional view of the gas burner 3 shown in FIG. 15(a).

A blast burner device 100 relating to the first embodiment of the present invention will be described below.

FIG. 1 is a schematic diagram of a blast burner device 100 relating to a first embodiment of the present invention. FIG. 2 is an external perspective view of the blast burner device 100 shown in FIG. FIG. 3 is an external perspective view of the interior of the blast burner device 100 shown in FIG. FIG. 4 is an external perspective view showing an enlarged main part of the blower burner device 100 shown in FIG. FIG. 5 is a side view of the blast burner device 100 shown in FIG. FIG. 6 is a front view of the blast burner device 100 shown in FIG. FIG. 7 is a rear view of the blast burner device 100 shown in FIG. 8 is a cross-sectional view taken along line S--S shown in FIG. 7. FIG.

The blast burner device 100 is a so-called premixed gas burner (premixed gas burner). The blower burner device 100 includes a blower 10 that compresses and blows air, and a gas burner 80 that combusts a mixture of compressed air and fuel blown from the blower 10 to generate flame. In the first embodiment, the fuel is fuel gas such as hydrogen gas or methane gas.

Note that the gas burner 80 corresponds to an example of the burner of the present invention.

The blower 10 includes a three-phase motor M that supports a fan F1 on an axis A, a case 21 that houses the three-phase motor M, and a case 11 that houses the fan F1. The fan F1 is provided at a predetermined distance T from the three-phase motor M (see FIG. 8).

The case 21 has a rectangular parallelepiped shape and is made of metal, for example. The case 21 is provided with a first vent 28 through which air flows and an inflow hole 29 through which fuel gas flows. The inflow hole 29 does not communicate with the internal space 22 of the case 21, but communicates with the internal space 16 of the case 11 (see FIG. 8). That is, the outlet 29A of the inflow hole 29 is located between the fan F1 and the three-phase motor M and faces the fan F1.

The case 21 also has an adjustment plate 27 that adjusts the amount of opening of the first ventilation holes 28 . The adjusting plate 27 can be moved in the direction indicated by the arrow by means of a bolt B (see FIGS. 8 and 10). For example, when the adjusting plate 27 abuts against the case 21, the first ventilation hole 28 can be closed.

Note that the adjustment plate 27 corresponds to an example of the adjustment portion of the present invention.

The case 11 has a cylindrical shape and is made of metal, for example. The internal space 22 of the case 21 and the internal space 16 of the case 11 communicate with each other. The case 11 is provided with a second vent 12 through which a mixture of compressed air and fuel flows.

Note that the case 21 and the case 11 constitute an example of the housing of the present invention.

The gas burner 80 includes an ignition sequence (not shown) and a cylindrical case 82 that houses the ignition sequence. An inflow hole 81 is provided in the case 82 . A flame hole 83 is provided in the case 82 . An internal space 87 communicating with the inflow hole 81 and the flame hole 83 is formed inside the case 82 . The tip of the case 82 is inserted into the opening 91 of the furnace wall 90 .

To simplify the explanation, illustration of the furnace wall 88 is omitted in FIGS.

The blower 10 and the gas burner 80 are directly connected and integrated. Thereby, the inflow hole 81 of the case 82 communicates with the second ventilation hole 12 of the case 11 .

FIG. 9 is a block diagram showing the configuration of each part provided in the blast burner device 100 shown in FIG. The blast burner device 100 includes a three-phase motor M, an operation section 31 that receives an operation input from an operator, and a control section 30 that controls each section provided in the burner device 100 . The operator inputs the current value, voltage value, and frequency to be supplied to the three-phase motor M from the operation unit 31 .

The control unit 30 is composed of, for example, a microcomputer and an inverter circuit. The control unit 30 extracts an AC voltage indicating the current value, the voltage value, and the frequency input by the operation unit 31 from the commercial AC power supply, and applies it to the three-phase motor M. Thereby, the control unit 30 performs inverter control of the three-phase motor M. FIG.

Next, the flow of air, fuel gas, and mixed gas when the blower 10 is driven will be described with reference to FIGS. 1 and 10. FIG.

FIG. 10 is a sectional view taken along line S--S when the three-phase motor M shown in FIG. 8 is driven to rotate the fan F1. Solid white arrows in FIGS. 1 and 10 indicate the flow of air. Solid oblique arrows indicate the flow of the fuel gas. A dotted white arrow indicates the flow of the mixed gas.

When the blower 10 is driven, the rotation of the fan F1 draws in fuel gas and air, the air flows into the internal space 22 of the case 21 through the first air vent 28, and the fuel gas flows into the case 11 through the inflow hole 29. It flows into space 16 .

Then, the blower 10 compresses the fuel gas and air that have flowed into the internal space 16 of the case 11 by rotating the fan F1, and blows the compressed air through the second ventilation hole 12 to the internal space 87 of the gas burner 80 . At this time, the fuel gas and air are mixed in the internal space 16 to form a mixed gas (mixture). After igniting according to the ignition sequence, the gas burner 80 combusts the mixed gas blown into the internal space 87 from the second vent 12 to generate flame from the flame hole 83 .

Here, in the gas burner 80, combustion in which the ejection speed of the combustion gas from the flame hole 83 is 80 m/s or more is classified as "high-speed combustion". In order to achieve this "high-speed combustion", the blast burner device 100 rotates the fan F1 at high speed. A three-phase motor M is used as a drive source for the fan F1 that rotates at high speed. As a result, the blower 10 blows the mixed gas with a high flow rate and a high pressure through the second ventilation hole 12 by rotating the fan F1. If the ejection velocity is, for example, 80 m/s or more and 300 m/s or less, it is classified as "high-speed combustion".

However, the three-phase motor M heats up to a high temperature by rotating the fan F1 at high speed. Therefore, the three-phase motor M needs to be separately provided with cooling means.

Therefore, in the blower burner device 100 of this embodiment, the three-phase motor M is positioned between the first ventilation hole 28 and the fan F1.

In this configuration, when the fan F1 rotates, the air that has flowed in from the first ventilation hole 28 passes through the three-phase motor M and is sucked into the fan F1 (see FIG. 10). That is, by housing the three-phase motor M in the case 21, air flows from the first air hole 28 through the three-phase motor M toward the fan F1.

Therefore, the blower burner device 100 of the present embodiment can cool the three-phase motor M that generates heat by air without separately providing cooling means such as the external fan F2 (see FIGS. 4 and 8). Further, since the rotation of the external fan F2 is eliminated and the three-phase motor M is accommodated in the case 21, noise caused by the three-phase motor M can be greatly suppressed. Therefore, conventionally, the current value and frequency had to be set low in consideration of the heat generation and noise of the three-phase motor M. Since there is a margin in the value and frequency, the current value and frequency can be set higher than before. That is, the blower 10 can blow a mixed gas with a high flow rate and a high atmospheric pressure from the second ventilation holes 12 while suppressing noise.

In addition, since the air is preheated by passing through the three-phase motor M, the warmed air can be supplied to the gas burner 80 through the second ventilation hole 12 . Thereby, the combustion efficiency of the gas burner 80 can be improved.

Moreover, in this configuration, the blower 10 and the gas burner 80 are integrated. Therefore, compared with the case where the blower 10 and the gas burner 80 are separate, the physical distribution cost for transporting the blower burner device 100 can be reduced.

15(a), 15(b) and 15(c), the conventional blower 1 is connected to the gas burner 3 via the mixer 2 and the premixed gas pipe 8. In this configuration, the blower 10 and the gas burner 80 are directly connected. Therefore, it is not necessary to prepare a special connecting pipe 8 for connecting the blower 1 and the gas burner 3, and the number of parts can be reduced. Therefore, manufacturing costs can be reduced.

An outlet 29A of the inflow hole 29 is located between the fan F1 and the three-phase motor M and faces the fan F1.

Therefore, the fuel gas that has flowed in from the inflow hole 29 is directly sucked into the fan F1 without passing through the three-phase motor M. That is, the gas that passes through the three-phase motor M is only air. Therefore, adhesion of fuel to the three-phase motor M can be prevented.

The case 21 also has an adjustment plate 27 that adjusts the amount of opening of the first ventilation holes 28 . The adjusting plate 27 can be moved in the direction indicated by the arrow by means of a bolt B (see FIGS. 8 and 10).

Therefore, the inflow amount of the air flowing in from the first ventilation holes 28 can be adjusted. Thereby, the ratio of air to fuel gas (air ratio) can be adjusted.

In the present embodiment, the position of the adjusting plate 27 is adjusted by the bolt B to adjust the opening amount of the first ventilation hole 28, but the present invention is not limited to this. In practice, the blower burner device may include a drive mechanism for moving the adjustment plate 27 , the drive mechanism may be controlled by the control section 30 , and the opening amount of the first vent hole 28 may be received by the operation section 31 . In this configuration, the control unit 30 adjusts the position of the adjusting plate 27 by the drive mechanism based on the opening amount of the first vent hole 28 received by the operation unit 31 , thereby adjusting the opening amount of the first vent hole 28 . The drive mechanism is for example a motor.

Further, in the present embodiment, the adjustment plate 27 is used to adjust the opening amount of the first air hole 28, but the present invention is not limited to this. In practice, the opening amount of the first air hole 28 may be adjusted by an adjusting portion other than the adjusting plate 27. FIG.

Next, a blower burner device 200 relating to a second embodiment of the present invention will be described.

FIG. 11 is a schematic diagram of a blast burner device 200 relating to a second embodiment of the invention.

The blast burner device 200 is a so-called premixed gas burner (nozzle mix gas burner). The difference between the blower burner device 200 and the blower burner device 100 is the case 221 of the blower 220 and the gas burner 280 . Since the other points are the same, the description is omitted.

Note that the gas burner 280 corresponds to an example of the burner of the present invention.

The case 221 does not have the inflow hole 29 unlike the case 21 .

The gas burner 280 includes an ignition sequence (not shown), a cylindrical nozzle 289 that houses the ignition sequence, and a cylindrical case 282 in which the nozzle 289 is inserted into the central axis. The case 282 is provided with an inflow hole 281 through which compressed air flows. An internal space 287 communicating with the inflow hole 281 is formed inside the case 282 . The tip of the case 282 is inserted into the opening 91 of the furnace wall 90 .

The nozzle 289 is provided with an inflow hole 285 into which the fuel gas flows, a mixing space 284 communicating with the internal space 287 and the inflow hole 285, and a flame holding plate 288 having a flame hole 283 communicating with the mixing space 284. there is

The blower 220 and the gas burner 280 are directly connected and integrated. Thereby, the inflow hole 281 of the case 282 communicates with the second ventilation hole 12 of the case 11 .

Next, the flow of air, fuel gas, and mixed gas when the blower 220 is driven will be described with reference to FIG. 11 . Solid white arrows in FIG. 11 indicate the flow of air. Solid oblique arrows indicate the flow of the fuel gas. A dotted white arrow indicates the flow of the mixed gas.

When the blower 220 is driven, air is sucked by the rotation of the fan F1, and the air flows into the internal space 222 of the case 221 through the first ventilation hole . The blower 220 compresses the air that has flowed into the internal space 222 of the case 211 by rotating the fan F1, and blows the compressed air through the second ventilation hole 12 to the internal space 287 of the gas burner 280. FIG.

On the other hand, fuel gas flows in from the inflow hole 285 . The fuel gas flowing from the inflow hole 285 and the compressed air blown into the internal space 287 from the second vent 12 are mixed in the mixing space 284 inside the nozzle 289 to form a mixed gas (mixture). After igniting according to the ignition sequence, the gas burner 280 combusts this mixed gas to generate flame from the flame hole 283 . Further, the compressed air blown into the internal space 287 from the second air hole 12 mixes with the unburned fuel discharged from the flame holes 283 from around the flame stabilizing plate 288 to burn the unburned fuel.

Also in the above configuration, the three-phase motor M is positioned between the first vent 28 and the fan F1. Then, when the fan F1 rotates, the air that has flowed in from the first ventilation hole 28 passes through the three-phase motor M and is sucked into the fan F1 (see FIG. 11). That is, by housing the three-phase motor M in the case 221, air flows from the first air hole 28 through the three-phase motor M toward the fan F1. Therefore, the blower burner device 200 can cool the three-phase motor M without separately providing cooling means such as an external fan.

Therefore, the blast burner device 200 of the present embodiment also produces the same effects as the blast burner device 100 .

Next, a blast burner device 300 relating to a third embodiment of the present invention will be described.

FIG. 12 is a schematic diagram of a blast burner device 300 relating to a third embodiment of the invention.

The blowing burner device 300 is a so-called hydraulic atomizing liquid fuel burner (hydraulic atomizing oil burner). A difference between the blast burner device 300 and the blast burner device 200 is that an oil burner 380 is provided instead of the gas burner 280 . Since the other points are the same, the description is omitted.

Note that the oil burner 380 corresponds to an example of the burner of the present invention.

The oil burner 380 includes an ignition sequence (not shown), a cylindrical nozzle 389 that houses the ignition sequence, and a cylindrical case 382 in which the nozzle 389 is inserted into the central axis. The case 382 is provided with an inflow hole 381 into which compressed air flows. An internal space 387 communicating with the inflow hole 381 is formed inside the case 382 . The nozzle 389 is provided with an inflow hole 385 into which the liquid fuel sprayed under pressure by a hydraulic pump or the like flows. Liquid fuels are, for example, kerosene, light oil, heavy oil.

The nozzle 389 is further provided with a mixing space 384 communicating with the internal space 387 and the inlet hole 385 , and a nozzle tip 388 having a flame hole 383 communicating with the mixing space 384 . The tip of the case 382 is inserted into the opening 91 of the furnace wall 90 .

The blower 220 and the oil burner 380 are directly connected and integrated. Thereby, the inflow hole 381 of the case 382 communicates with the second ventilation hole 12 of the case 11 .

Next, the flow of air and fuel when the blower 220 is driven will be described with reference to FIG. 12 . Solid white arrows in FIG. 12 indicate the flow of air. Solid hatched arrows indicate fuel flow.

When the blower 220 is driven, air is sucked by the rotation of the fan F1, and the air flows into the internal space 222 of the case 221 through the first ventilation hole . The blower 220 compresses the air that has flowed into the internal space 222 of the case 211 by rotating the fan F1 and blows the compressed air through the second ventilation hole 12 to the internal space 387 of the gas burner 380 .

On the other hand, the liquid fuel pressurized and sprayed by a hydraulic pump or the like flows into the nozzle 389 through the inflow hole 385 . The liquid fuel flowing from the inflow hole 385 and the compressed air blown into the internal space 387 from the second vent 12 are mixed in the mixing space 384 and the nozzle tip 388 to form a mixture. After igniting according to the ignition sequence, the oil burner 380 combusts this mixture and generates flame from the flame hole 383 . Further, the compressed air blown into the internal space 387 from the second air hole 12 mixes with the unburned fuel discharged from the flame hole 383 from around the nozzle tip 388, and burns the unburned fuel.

Also in the above configuration, the three-phase motor M is positioned between the first vent 28 and the fan F1. Then, when the fan F1 rotates, the air that has flowed in from the first air hole 28 passes through the three-phase motor M and is sucked into the fan F1 (see FIG. 12). That is, by housing the three-phase motor M in the case 221, air flows from the first air hole 28 through the three-phase motor M toward the fan F1.

Therefore, the blast burner device 300 of the present embodiment also produces the same effects as the blast burner device 100 .

Next, a blast burner device 400 relating to a fourth embodiment of the present invention will be described.

FIG. 13 is a schematic diagram of a blast burner device 400 relating to a fourth embodiment of the invention.

The blower burner device 400 is a so-called two-fluid atomizing internal mixing liquid fuel burner (two-fluid atomizing internal mixing oil burner). The difference between the blast burner device 400 and the blast burner device 200 is that an oil burner 480 is provided instead of the gas burner 280 . Since the other points are the same, the description is omitted.

Note that the oil burner 480 corresponds to an example of the burner of the present invention.

The oil burner 480 includes an ignition sequence (not shown), a cylindrical nozzle 489 that houses the ignition sequence, and a cylindrical case 482 in which the nozzle 489 is inserted into the central axis. The case 482 is provided with an inflow hole 481 through which compressed air flows. An internal space 487 communicating with the inflow hole 481 is formed inside the case 482 . The tip of the case 482 is inserted into the opening 91 of the furnace wall 90 .

The nozzle 489 is provided with an inflow hole 485 through which the liquid fuel is pressurized and sprayed together with air or steam of a predetermined pressure by a hydraulic pump or the like. Liquid fuels are, for example, kerosene, light oil, heavy oil. The predetermined pressure is, for example, 196 kPa to 980 kPa. Furthermore, the nozzle 489 is also provided with an inlet hole 486 through which an atomizing medium such as air or steam flows. The nozzle 489 also has a flame hole 483 that communicates with the inflow holes 485 and 486 .

The blower 220 and the oil burner 480 are directly connected and integrated. Thereby, the inflow hole 481 of the case 482 communicates with the second ventilation hole 12 of the case 11 .

Next, the flow of air, liquid fuel, and spray medium when the blower 220 is driven will be described with reference to FIG. 13 . Solid white arrows in FIG. 13 indicate the flow of air. A solid hatched arrow indicates the flow of the liquid fuel. The dashed hatched arrows indicate the flow of the atomizing medium.

When the blower 220 is driven, air is sucked by the rotation of the fan F1, and the air flows into the internal space 222 of the case 221 through the first ventilation hole . The blower 220 compresses the air that has flowed into the internal space 222 of the case 211 by rotating the fan F1 and blows the compressed air through the second ventilation hole 12 to the internal space 487 of the gas burner 480 .

On the other hand, the pressurized and sprayed liquid fuel flows into the nozzle 489 through the inflow hole 485 . The liquid fuel that has flowed in from the inflow hole 485 and the spray medium that has flowed in from the inflow hole 486 are mixed in the mixing chamber 484 inside the nozzle 489 . After igniting according to the ignition sequence, the oil burner 480 burns the liquid fuel and the atomizing medium to generate flame from the flame hole 483 . Furthermore, the compressed air blown into the internal space 487 from the second air hole 12 mixes with the unburned fuel discharged from the flame hole 483 from around the tip of the nozzle 489, and burns the unburned fuel.

Also in the above configuration, the three-phase motor M is positioned between the first vent 28 and the fan F1. Then, when the fan F1 rotates, the air that has flowed in from the first air hole 28 passes through the three-phase motor M and is sucked into the fan F1 (see FIG. 13). That is, by housing the three-phase motor M in the case 221, air flows from the first air hole 28 through the three-phase motor M toward the fan F1.

Therefore, the blast burner device 400 of the present embodiment also produces the same effects as the blast burner device 100 .

Next, a blast burner device 500 relating to a fifth embodiment of the present invention will be described.

FIG. 14 is a schematic diagram of a blast burner device 500 relating to a fifth embodiment of the invention.

The blower burner device 500 is a so-called two-fluid atomizing external mixing type liquid fuel burner (two-fluid atomizing external mixing type oil burner). The difference between the blast burner device 500 and the blast burner device 200 is that an oil burner 580 is provided instead of the gas burner 280 . Since the other points are the same, the description is omitted.

Note that the oil burner 580 corresponds to an example of the burner of the present invention.

The oil burner 580 includes an ignition sequence (not shown), a cylindrical nozzle 589 that houses the ignition sequence, and a cylindrical case 582 in which the nozzle 489 is inserted into the central axis. The case 582 is provided with an inflow hole 581 through which compressed air flows. An internal space 587 communicating with the inflow hole 481 is formed inside the case 582 . The tip of the case 582 is inserted into the opening 91 of the furnace wall 90 .

The nozzle 589 is provided with an inflow hole 585 through which liquid fuel is pressurized and sprayed together with air or steam of a predetermined pressure by a hydraulic pump or the like. Liquid fuels are, for example, kerosene, light oil, heavy oil. The predetermined pressure is, for example, 196 kPa to 980 kPa. Furthermore, the nozzle 589 is also provided with an inlet hole 586 through which an atomizing medium such as air or steam flows. The nozzle 589 also has a tip 584 having a flame hole 583 communicating with the inlet holes 585 and 586 .

In the oil burner 580 that does not have the mixing chamber 484 , the liquid fuel and the atomizing medium are mixed in a region closer to the flame hole 583 than in the oil burner 480 .

The blower 220 and the oil burner 580 are directly connected and integrated. Thereby, the inflow hole 581 of the case 582 communicates with the second ventilation hole 12 of the case 11 .

Next, the flow of air, liquid fuel, and spray medium when the blower 220 is driven will be described with reference to FIG. 14 . Solid white arrows in FIG. 14 indicate the flow of air. A solid hatched arrow indicates the flow of the liquid fuel. The dashed hatched arrows indicate the flow of the atomizing medium.

When the blower 220 is driven, air is sucked by the rotation of the fan F1, and the air flows into the internal space 222 of the case 221 through the first ventilation hole . The blower 220 compresses the air that has flowed into the internal space 222 of the case 211 by rotating the fan F1, and blows the compressed air through the second ventilation hole 12 to the internal space 587 of the gas burner 580 .

On the other hand, the pressurized and sprayed liquid fuel flows into the nozzle 589 through the inflow hole 585 . The liquid fuel that has flowed in from the inflow hole 585 and the spray medium that has flowed in from the inflow hole 586 are mixed at the nozzle tip 584 . The oil burner 580 ignites according to the ignition sequence, then burns the liquid fuel and the atomizing medium, and generates flame from the flame hole 583 . Furthermore, the compressed air blown into the internal space 587 from the second air hole 12 mixes with the unburned fuel discharged from the flame hole 583 from around the tip 584 to burn the unburned fuel.

Also in the above configuration, the three-phase motor M is positioned between the first vent 28 and the fan F1. Then, when the fan F1 rotates, the air that has flowed in from the first ventilation hole 28 passes through the three-phase motor M and is sucked into the fan F1 (see FIG. 14). That is, by housing the three-phase motor M in the case 221, air flows from the first air hole 28 through the three-phase motor M toward the fan F1.

Therefore, the blast burner device 500 of the present embodiment also produces the same effects as the blast burner device 100 .

Finally, the description of the above-described embodiments should be considered illustrative in all respects and not restrictive. The scope of the invention is indicated by the claims rather than the above-described embodiments. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and range of equivalents of the claims.

REFERENCE SIGNS LIST 1 blower 2 mixer 3 gas burner 4 outer box 5 secondary air pipe 6 premixed gas pipe 7 flame hole 8 premixed gas pipe 100, 200, 300, 400, 500 blower burner device 10, 220 Blowers 80, 280 Gas burner 11 Case 12 Second ventilation holes 21, 221 Case 27 Adjustment plate 28 First ventilation hole 29 Inlet 380, 480, 580 Oil burner
F1…Fan
M…Three-phase motor

Claims (2)

A housing provided with a first ventilation hole and a second ventilation hole through which air flows, and a three-phase motor that is housed in the housing and rotates a fan. an air blower that is compressed by the rotation of the fan and blows air from the second ventilation hole;
a burner connected to the second vent,
The three-phase motor is positioned between the first vent and the fan,
The housing is provided with an inflow hole through which fuel flows,
an outlet of the inflow hole is located between the fan and the three-phase motor and faces the fan;
The blower blows a mixture of fuel and compressed air that has flowed in through the inflow hole into the burner through the second vent,
A blast burner device, wherein the burner burns the mixture to generate a flame. 2. The blast burner device according to claim 1, wherein said housing has an adjusting portion for adjusting the opening amount of said first ventilation hole.

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