JPS63213706A - Gun-type burner - Google Patents

Abstract

PURPOSE:To stabilize the burning by disposing an ignition electrode in a portion of the combustion air stream caused by a fan where the velocity component parallel with the plane made by the blow tube end is the smallest possible to a practical extent. CONSTITUTION:When the start switch is turned ON, a fan 21 rotates to cause combustion air to flow to the burner head 24 and to a combustion part 26 after being smoothed by multiple air flow smoothing holes 27 in a cylindrical blow tube 28. When the supply air rate reaches a certain level, a spark is generated at an ignition electrode 31, and fuel is jetted out of a fuel injection nozzle 30. The burning is then started in the combustion part 26 as the flame is held by a stabilizer 25. Because the dynamic pressure is relatively low in the part covering the lower right to the right of the end of the flow tube 28, and the speed of combustion air is relatively low in the plane parallel with the end of the blow tube 28, the ignition electrode 31 does not greatly disturb the combustion air flow along the plane parallel with the end of the blow tube despite the fact that the ignition electrode 31 projects from the end of the blow tube 28 into the fan case.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gun-type burner used in oil boilers and the like.

BACKGROUND OF THE INVENTION In recent years, gun-type burners have been widely used in the hot water and space heating industries due to their simplicity and low maintenance costs, in line with changes in energy consumption trends.

Hereinafter, an example of the conventional gun type burner mentioned above will be described with reference to the drawings.

FIG. 3 is a front sectional view of a burner unit of a conventional gun-type burner, and FIG. 4 is a side sectional view of the burner unit. In Figures 3 and 4, the blind is a blower fan that blows combustion air, and is housed in the fan case 2.
It is rotated by a fan motor 3. Reference numeral 4 denotes a burner head portion, which is provided substantially perpendicularly and connected to the fan case 2.

The burner head section 4 has a combustion section 6 centered on a stabilizer 5 at one end, and a blow tube 8 having a large number of air regulating holes 7 at the other end. 9
A nozzle adapter is fixed to the end of the blow tube 8 having the air rectification hole 7 with its own fixing flange. The nozzle adapter 9 connects the fuel spray nozzle 10 and holds the ignition electrode 11.

The operation of the gun type burner configured as above will be explained below.

When a switch (not shown) for starting the gun-type burner is turned on, first, the fan motor 3 generates electricity and the blower fan 1 rotates. When the blower fan 1 rotates,
Combustion air is directed to the burner head section 4. The combustion air is
The flow is rectified by a large number of air rectifying holes 7 provided at one end of the cylindrical blow tube 8, and reaches the combustion section 6. When the amount of air supplied to the combustion section 6 reaches a certain level, the ignition electrode 11 sparks, and then fuel is sprayed from the fuel jet nozzle 10 to the stabilizer 5 formed at the other end of the blow tube 8. Combustion is started in the combustion section 6 while flame holding is maintained. In addition, 13- in the fan case 2 when blowing air.
Figure 15 shows the dynamic pressure distribution at the 9' cross section (Figure 4).

Problems to be Solved by the Invention However, the above configuration has a problem in that it is difficult to stabilize the flow of combustion air sent to the combustion section 6. To explain the reason, if we look at the dynamic pressure distribution on the Q-e'i plane (the plane parallel to the end of the blow tube 8) inside the fan case 2 shown in Fig. 4, we find that it is never uniform as shown in Fig. 5. It can be seen that this does not indicate a distribution. In other words, it can be seen that the dynamic pressure is high in the upper left part immediately after the inflow of combustion air at the end of the blow tube 8, while the dynamic pressure decreases toward the lower right of the inflow end. A high dynamic pressure means a high flow velocity, so at the end of the blow tube 8, the flow velocity at the upper left of the blow tube 8 (velocity component at the point parallel to the end of the blow tube 8) is the highest. I understand that. On the contrary, it can be seen that the flow velocity decreases toward the lower right of the blow tube. The nozzle adapter 9 is fixed to the end of the blow tube 8 that forms such a flow state, and the ignition electrode 11 is also held and fixed to the front left side of the nozzle adapter 9. A portion of the ignition electrode 11 is shaped to protrude into the fan case 2 from the end of the blow tube 8 due to the mounting configuration. Therefore, blow tube 8
The combustion air flow in the plane parallel to the end is disturbed by the ignition electrode 11, and the flow downstream of the ignition electrode 11 becomes very complicated. Therefore, in the conventional mounting position of the ignition electrode 11, the flow velocity at that position is high, resulting in unnecessarily large flow disturbances downstream of the ignition electrode 11. For this reason, despite the large number of air regulating holes 7 provided at the end of the blow tube 8, the combustion air flow sent to the combustion section 6 has been extremely unstable. From the above, conventional gun-type burners have the problem of unstable combustion both during ignition and steady combustion, resulting in unnecessary generation of noise, odor, soot, and the like.

The present invention addresses the above-mentioned problems and arranges the ignition electrode at a position in the combustion air flow sent from the blower fan where the velocity of the flow, which is a component parallel to the plane formed by the end of the blow tube, is as small as possible. This provides a gun-type burner with stable combustion performance.

In order to solve the above-mentioned problem, the gun type burner of the present invention includes a blower fan, a fan case that houses the blower fan, and a fan case that accommodates the blower fan on the outlet side of the fan. and a burner head section provided substantially orthogonally and connected to each other, the burner head section has a cylindrical blow tube whose both ends are parallel to the fan case, and the blow tube is One end has a combustion part centered on the stabilizer, and the other end exists inside the fan case, has a large number of air rectification holes, and has a self-fixing part in the center of the end. A nozzle adapter with a flange connects a fuel spray nozzle and is fixed in a state that holds an ignition electrode, and the ignition electrode is configured to absorb the combustion air flow sent from the blower fan.
The blow tube is arranged at a position where the flow velocity having a component in a direction parallel to the plane formed by the end of the blow tube is as small as possible.

Effects According to the present invention, with the above-described configuration, it is possible to send stable combustion air to the combustion section, thereby making it possible to obtain a gun-type burner having stable combustion performance.

EXAMPLE Hereinafter, a gun type burner according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view of a burner unit of a gun-type burner of the present invention, and FIG. 2 is a side sectional view of the same burner unit. In FIGS. 1 and 2, 21 is
This is a blower fan that blows combustion air, and is housed in a fan case 22 and rotated by a fan motor 23. 2
Reference numeral 4 denotes a burner head portion, which is provided substantially perpendicularly and connected to the fan case 22. The burner head section 2
4, one end is a combustion section 26 centered around a stabilizer 25, and the other end contains a blow tube 28 having a large number of air regulating holes 27. 29
is a nozzle adapter, which is fixed to the center of the end of the blow tube 28 having the air rectifying hole 27 with its own fixing flange. The nozzle adapter 29 connects the fuel spray nozzle 30 and the ignition electrode 3.
1 is held so as to be located on the right side when viewed from the front of the end of the blow tube 28. A portion of the ignition electrode 11 is a bracket that protrudes from the end of the blow tube 28 into the fan case 22 due to its mounting structure.

The operation of the gun type burner configured as above will be explained below.

When a switch (not shown) for starting the gun type burner is turned on, first, the fan motor 23 is started and the blower fan 21 rotates. As the blower fan 21 rotates, combustion air is guided to the burner head section 24. The flow of the combustion air is rectified by a large number of air rectifying holes 27 provided at one end of the cylindrical blow tube 28 and reaches the combustion section 26 . When the amount of air supplied to the combustion section 26 reaches a certain level, the ignition electrode 31 sparks, and then fuel is sprayed from the fuel spray nozzle 30 and stored in the stabilizer 25 formed at the other end of the blow tube 28. Combustion is started in the combustion section 26 while a flame is generated. On the other hand, the voltage distribution on the horizontal section 11i (the plane parallel to the end of the blow tube 28) inside the fan case 22 is as shown in FIG. It can be seen that the position from the bottom right to the right is a place where the dynamic pressure is relatively low. That is, at the position,
It can be said that the air flow velocity of the combustion air in the plane parallel to the end of the blow tube 28 is relatively small. Therefore, the ignition electrode 31 attached to the right side of the center when viewed from the front of the end of the blow tube 28 protrudes from the end of the blow tube 28 into the fan case 22 due to its mounting configuration. , :: Despite the sharpness, the turbulence of the combustion air flow on the plane parallel to the end of the blow tube 28 is not significantly disturbed.

Effects of the Invention As described above, the present invention includes a blower fan, a fan case housing the blower fan, and a burner head portion provided substantially orthogonally and connected to the fan case on the outlet side of the fan. The burner head section has a cylindrical blow tube whose both ends are parallel to the fan case. , a nozzle adapter existing in the fan case, having a number of air rectifying holes at its end, and having a fixing flange at the center of the end, connects the fuel spray nozzle; and is fixed in a state where it holds an ignition electrode, and the ignition electrode forms a component of the combustion air flow sent from the blower fan in a direction parallel to the plane formed by the end of the blow tube. By arranging it at a position where the flow velocity is as low as possible, it is possible to send stable combustion air to the combustion section, thereby achieving stable combustion performance and reducing noise, odor, soot, etc. It has become possible to prevent the unnecessary occurrence of

[Brief explanation of the drawing]

Fig. 1 is a new front view of a burner unit of a gun-type burner according to an embodiment of the present invention, Fig. 2 is a side sectional view of the same burner unit, and Fig. 3 is a front view of a burner unit of a conventional gun-type burner. 4 is a side sectional view of the same burner unit, and FIG. 5 is a dynamic pressure distribution diagram at the B-8' section in FIG. 4. 21...Blower fan, 22...Fan case, 24...Burner head section, 25...
... Stabilizer, 26... Combustion part, 27.
... Air rectification hole, 28 ... Blow tube, 29 ... Nozzle adapter, 30 ...
...Fuel spray nozzle, 31...Ignition vptiM. Name of agent: Patent attorney Toshio Nakao and 1 other person21
- Feedback J hole fan 22 - Fan case 24 - Haranahetsu 1: Country 27・-Shinki vertical fan U-・Flow tube Z/-・-Feed MJ7 An 2? -Fan case z4-Burner head number and 4-Flow tube Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A gun-type burner comprising a blower fan, a fan case for housing the blower fan, and a burner head section provided substantially perpendicularly and connected to the fan case on the outlet side of the fan, the burner head section. The blow tube has a cylindrical blow tube with both ends parallel to the fan case, and one end of the blow tube has a combustion part centered on the stabilizer, and the other end resides inside the fan case and has a combustion part centered on the stabilizer. A nozzle adapter having a number of air rectifying holes at the end and having a fixing flange at the center of the end is fixed in a state where the fuel spray nozzle is connected and the ignition electrode is held. The ignition electrode is arranged at a position where the velocity of the combustion air flow sent from the blower fan is as small as possible, which has a component in a direction parallel to the plane formed by the end of the blow tube. , gun type burner.