JPH058205U - Pressure spray burner - Google Patents

Abstract

(57) [Abstract] [Purpose] A pressure spray that forms a strong swirling flow of primary air on the surface of the flame holding plate to ensure stable combustion without sticking of carbon etc. A formula burner is provided. [Structure] A suppression plate 23 is provided on the windward side of the flame holding plate 13 so as to face the gap 22 between the cut and raised swirl vanes 15, so that the gap 22 horizontally escapes to the surface of the flame holding plate 13. The air flow disappears, and all of them are swirled while being guided by the swirl vanes 15, so that the flame holding plate 13 can perform a good flame holding action.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure spray burner which uses kerosene as a fuel and is used in a water heater for home use.

[0002]

[Prior Art]

 Conventionally, in this type of device, as disclosed in, for example, Japanese Utility Model Publication No. 2-45614, the flame holding plate is provided with a portion without swirl vanes, that is, a ring-shaped stabilizer, and By making the part parallel to the stabilizer, a clear boundary area is formed between the swirl flow area around the flame holding plate and the secondary recirculation area caused by this swirl flow, and stable combustion is obtained. In addition, by making part of the swirl vanes parallel to the stabilizer, the retention time of the primary combustion swirl flame in the inner shell becomes longer, and better stable combustion can be performed, resulting in short flame and low noise combustion. Was to be obtained.

[0003]

[Problems to be solved by the device]

 By the way, in this conventional type, there is a problem that the swirling flow of the primary combustion is stagnated at the stabilizing plate portion, and the carbon adheres to this portion. Furthermore, as shown in the enlarged sectional view of the main part shown in FIG. At the tips of the blades 15, an air flow A guided by the swirl blades 15 in the swirl direction and an air flow B straight out of the gap 22 between the swirl blades 15 act, and these two air flows Therefore, the swirling flow on the surface of the flame holding plate 13 eventually becomes the synthesized air flow C, and if the flat part of the swirling vane 15 is parallel to the stabilizing plate, the swirling flow is good along the surface of the flame holding plate 13. It was not possible to obtain a good swirling flow, and the flame holding was not stable, which caused poor combustion.

[0004]

[Means for solving problems]

 This invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the structure is provided with a nozzle inside and a primary air hole at the rear of the nozzle and a secondary air hole at the front. It consists of an inner case and an outer case that forms a blast path through which combustion air from a blower flows between the inner case and the inner case, which has a central hole in front of the nozzle and a primary hole around it. In a pressure spray burner equipped with a flame holding plate formed with a plurality of swirling blades cut and raised to give swirling force to the air flow, a gap between the swirling blades is provided on the windward side of the flame holding plate. It is provided with a restraint plate that faces the above and restrains the horizontal flow of the primary air.

[0005]

[Action]

 A part of the air blown from the blower 5 communicating with the rear part of the outer case 10 flows into the inner case 6 from the primary air holes 8 behind the inner case 6 and mixes with the fuel oil sprayed from the nozzle port 4 to form the primary air. The primary air that burns and reaches the flame holding plate 13 in front of the nozzle 3 forms a swirling flow on the surface of the flame holding plate 13 while being guided by the swirling blade 15 that has been cut and raised. Since the air gap is not directly guided by the swirl vanes 15 between the flame retaining plates 13 and the gap 22 that directly tries to escape from the rear side to the front side of the flame retaining plate 13 in the horizontal direction is obstructed by the suppressing plate 23, the flame retaining plate 13 is prevented. All of the primary air that has reached the temperature is guided by the swirl vanes 15 to surely form a swirl flow region on the surface of the flame holding plate 13 to prevent carbon from adhering, and a good flame holding action can always be performed, which is excellent. Combustion is obtained.

[0006]

【Example】

 Next, a pressure spray burner according to the present invention will be described with reference to a preferred embodiment shown in the drawings. Reference numeral 1 denotes a burner body provided in a water heater or the like, which sprays fuel oil pressurized by an electromagnetic pump 2 from a nozzle port 4 at the tip of a nozzle 3 and mixes this sprayed fuel with combustion air from a blower 5. Pressure spray combustion is performed.

Reference numeral 6 denotes an inner case body in which the nozzle 3 is fixed to a central portion of a rear plate 7, and the rear plate 7 is provided with a plurality of primary air holes 8 having a diameter gradually increasing from the central portion toward the outside. Secondary air holes 9 are formed in the peripheral wall on the front end side. The secondary air holes 9 are composed of two rows of small-diameter air holes and alternating small-diameter and large-diameter air holes.

Reference numeral 10 denotes an outer case surrounded by an air passage 11 outside the inner case 6. A blower 5 is connected to a rear air inlet 12 so that the primary and secondary sides of the inner case 6 are extended from the air passage 11. Combustion air is supplied to the air holes 8 and 9, respectively. Reference numeral 13 is a disc-shaped flame holding plate provided inside the inner case 6 and between the front of the nozzle 3 and the secondary air hole 9. In the central portion, the atomized fuel from the nozzle 3 and a part of the primary air are provided. Has a central hole 14 through which is circulated, and a plurality of cut and swirled blades 15 are formed around the central hole 14.

Further, the swirl vane 15 is cut and raised after making a plurality of cuts so as to form a fan shape, while forming the closing wall 16 on the outer peripheral side while leaving about half as the remaining portion 17, and the tip portion thereof. The flat portion 18 is formed by folding back a little inward, and the obstruction wall 16 is left on the outer peripheral side that is conventionally opened, so that unnecessary primary air is prevented from flowing out from the outer peripheral side. The flow of the primary air flowing through the flame stabilizing plate 13 is smoothly changed to the flow in the swirling direction.

Reference numeral 19 is an auxiliary disc provided on the windward side of the primary air, which is the back side of the flame stabilizing plate 13, and has an opening 20 having the same diameter as the central hole 14 of the flame stabilizing plate 13 in the center. A reinforcing ring portion 21 is provided on the outer periphery thereof, and a suppressing plate 23 is provided at a position that is connected to the ring portion 21 and faces the gap 22 between the swirl vanes 15, and a circulation plate that faces the swirl vane 15 part. The holes 24 are alternately provided.

Further, the flame holding plate 13 is spot-welded to the auxiliary disc 19, and the auxiliary disc 19 is attached together by being attached in the inner case 6 by a plurality of attachment legs 25. Reference numeral 26 is a pair of ignition electrodes for igniting the sprayed fuel, and 27 is an oil feeding pipe which is provided with an electromagnetic pump 2 in the middle thereof and supplies fuel oil to the nozzle 3.

Next, the operation of this embodiment will be described. If the combustion start operation is performed now, the pressurized fuel is sprayed from the nozzle port 4 of the nozzle 3, and the combustion air is further supplied to the blower passage 11 by driving the blower 5. It flows into the inner case 6 through the primary air holes 8, and a part of it is directly supplied to the spray fuel from around the nozzle 3 and mixed with it, and is ignited by the spark of the ignition electrode 26 to perform primary combustion. It is a thing.

The other primary air that has flowed into the inner case 6 is directed toward the flame holding plate 13 to form a flame, which serves as a seed for subsequent combustion and continues combustion. Combustion air that has passed through the air passage 11 on the outer peripheral wall is supplied from the secondary air holes 9 at the tip during primary combustion, where it is possible to perform complete combustion of secondary combustion while performing good mixing. Water that is the object of heating is efficiently boiled through such a can body.

Further, in the above-described flame-holding formation on the flame-holding plate 13, the primary air flowing from the rear of the inner case 6 is guided by the swirl vanes 15 to form a swirling flow that flows on the surface of the flame-holding plate 13. However, at this time, as shown in FIG. 3, the gap 22 between the swirl vanes 15 of the flame holding plate 13 is obstructed by the suppression plate 23 of the auxiliary disc 19, so that the primary air flowing into this part is suppressed. Since it collides with the plate 23 and is guided to the swirl vanes 15 through the circulation hole 24 in the immediate vicinity, the air flow direction in the flame holding plate 13 is only one direction of the swirl direction, and there is a plurality of different directions as in the conventional case. Since the air flow does not become a combined flow, the flow is always in a good swirling direction to provide a reliable flame holding effect, and the problem of carbon sticking to the surface of the flame holding plate 13 is prevented, and It eliminates the need for a conventional stabilizer.

Further, in this invention, the outer peripheral side of the swirl vane 15 which is cut and raised is closed by the closing wall 16, and since this part is opened as in the conventional case, wasteful outflow of primary air is eliminated and flame holding is performed. All of the primary air that has flowed to the plate 13 is made into a swirling flow, which makes it possible to further improve the flame holding effect and to always obtain stable combustion. is there.

In this embodiment, the suppression plate 23 is formed on the auxiliary disc 19 which is a separate body from the flame holding plate 13. However, it goes without saying that they may be directly attached to the flame holding plate 13 one by one. Is.

[0017]

[Effect of the device]

 In short, the present invention includes an inner case 6 having an inner nozzle 3 and a primary air hole 8 behind the nozzle 3, and a secondary air hole 9 on the front side, and the inner case 6. It is composed of an outer case 10 forming an air passage 11 through which the combustion air from the blower 5 flows, and further has a central hole 14 in front of the nozzle 3 in the inner case 6, around which a primary air flow is formed. In a pressure spray burner equipped with a flame holding plate 13 having a plurality of turning blades 15 cut and raised so as to give a turning force, between the turning blades 15 on the windward side of the flame holding plate 13. Since the suppression plate 23 that faces the gap 22 and suppresses the horizontal flow of the primary air is provided, all the primary air flowing into the flame holding plate is smooth to the swirling flow flowing on the surface of the flame holding plate. The flame-retardant plate has been changed to obtain a good flame-holding action with a powerful swirling flow, as well as a flame-holding plate. Mosquito - carbon deposition also be prevented, but are Tokura combustion stable short flame.

[Brief description of drawings]

FIG. 1 is a sectional view of a pressure spray burner according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the flame holding plate and the auxiliary disc.

FIG. 3 is an enlarged cross-sectional view of the relevant part.

FIG. 4 is an enlarged sectional view of a main part of a conventional example.

[Explanation of symbols]

 3 Nozzle 5 Blower 6 Inner Body 8 Primary Air Hole 9 Secondary Air Hole 10 Outer Body 11 Air Blower 13 Flame Retaining Plate 14 Center Hole 15 Swivel Blade 22 Gap 23 Suppression Plate

Claims (1)

[Claims for utility model registration] 1. An inner shell 6 having a nozzle 3 inside, a primary air hole 8 behind the nozzle 3, and a secondary air hole 9 on the front side. , An outer case 10 forming an air passage 11 through which combustion air from the blower 5 flows between the inner case 6 and the inner case 6, and further has a central hole 14 in front of the nozzle 3 in the inner case 6, A flame holding plate 1 around which a plurality of swirl vanes 15 cut and raised to give a swirl force to the primary air flow are formed.
3 is characterized in that a suppression plate 23 is provided on the windward side of the flame holding plate 13 so as to face the gap 22 between the swirl vanes 15 and suppress the horizontal flow of the primary air. A pressure spray burner.