JP2001304509A - Pressure atomizing oil burning appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner structure wherein combustion is performed with short flames by improving the combustion characteristics of a pressure atomizing oil burning appliance. SOLUTION: A bottomed heat chamber 3 of cylindrical shape having a number of air supply holes 3a on its side wall is disposed in a blast cylinder 2 for blowing combustion air therethrough with a combustion fan 1. A fuel inlet 4 provided at the center of the bottom plate of the heat chamber 3 is confronted with a fuel atomizing nozzle 7 to supply fuel, which has been atomized by a discharge pressure of a fuel pump 6, to the heat chamber 3. A swirl vane 5 is provided around the inlet 4 to form a swirling airflow in the heat chamber 3. The air supply holes 3a are arranged so as to have a small interval between them along the swirling direction, and to have a large interval between them in the lateral direction, thereby constituting an oblique small-hole row 8. In this way, flames are dispersed to the vicinity of the side wall of the heat chamber 3, and thus stable combustion of short flames can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner structure having improved combustion characteristics of a pressure spray type oil combustor.

[0002]

2. Description of the Related Art A blower tube to which combustion air is sent by a combustion fan also serves as an outer wall of a burner portion. A ring-shaped swirler is mounted in the blower tube, and a fuel spray nozzle is provided at the center of the swirler. It is installed with the spout at the opening. When a fuel pump that supplies pressurized fuel to the fuel spray nozzle is operated, the pressurized fuel is sprayed in the form of a mist from the ejection port of the fuel spray nozzle toward the combustion chamber, and combustion caused by sparks flying from the spark electrode. Be started.

When the mist fuel ignited from the opening at the center of the swirling blade is ignited and combustion is started, a part of the mist fuel is diffused as combustible gas to the front surface of the swirling blade. When the combustion air is supplied from the swirling blade, the flame adheres to the swirling blade and forms a ring-shaped fire. The fuel blown out from the fuel spray nozzle is stable without extinguishing even if the spark ignition is stopped. Burned combustion can be continued. Then, for the flame extending from the front surface of the swirling vane, air is supplied forward to wrap the outer periphery of the flame from the tip of the blower tube and burned, and the spray fuel burns as a long flame extending forward. Things.

[0004] Since the shape of the combustion chamber must be enlarged in such a long flame, a structure for supplying combustion air from the side of the flame extending in front of the swirl vanes so as to wrap the flame has been implemented. The blades are placed on the bottom plate of the bottomed cylindrical combustion cylinder, and air is supplied from the air supply port provided on the side plate of the combustion cylinder toward the side of the combustion flame, thereby promoting combustion in the combustion cylinder. As a result, the length of the combustion flame becomes shorter.

[0005]

As described above, in the case of having a bottomed cylindrical combustion cylinder for burning with a short flame,
It is necessary to balance the air supplied from the tip of the blower cylinder, the air supplied from the air supply port of the combustion cylinder, the air supplied from the swirling blade, and the air supplied from the fuel inlet, for example, the total opening of the air supply port If the area is increased and the amount of inflow air is increased, the amount of air supplied from other parts will decrease,
The combustion balance is broken and incomplete combustion is likely to occur. For this reason, it is necessary to provide an air supply port so as to supply an amount of air corresponding to the amount of combustion in the combustion cylinder determined by the size of the combustion cylinder, and the number of holes constituting the air supply port is required. And the hole diameter could not be changed significantly.

Further, the combustion flame is blown forward by the air blown from the air supply port on the side wall of the combustion cylinder while being positioned at the center of the combustion cylinder. When the flammable gas diffuses into the non-porous portion because there is a large amount of flammable gas that cannot be opened, incomplete combustion gas accompanied by carbon is likely to be generated due to lack of air supply. Since it becomes soot and adheres to the inner wall surface of the combustion cylinder and the combustion chamber, it often requires maintenance, and if left untreated, the heat exchange efficiency deteriorates.

On the other hand, when stable combustion is performed by air supplied from the combustion cylinder and complete combustion is completed, the combustion is completed with a short flame.
It has been pointed out that there is a problem of emission of Ox. Conventionally, it has been prioritized to obtain complete combustion by a shorter flame than to generate incomplete combustion gas. However, recently, there is a strong demand for reducing NOx generated from a burner. Then, the goodness of the long flame burner which can burn with a long flame is being reviewed again.

[0008] However, when the structure is designed to burn with a long flame, when the predetermined number of revolutions cannot be obtained due to clogging of an air filtration filter for combustion air or trouble of the combustion fan, the combustion air may run short. At this time, a long flame may extend further and approach or come into contact with the combustion chamber wall.There is a problem that the flame is cooled and carbon is easily generated. Become.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a bottomed tubular combustion tube 3 disposed in a blower tube 2 to which combustion air is sent by a combustion fan 1, and
A large number of air supply ports 3a are provided on the side wall of the combustion tube 3, a fuel inlet 4 is provided at the center of the bottom plate, and a swirler 5 is provided around the fuel inlet 4. In a petroleum burner equipped with a fuel spray nozzle 7 for supplying atomized fuel into the combustion cylinder 3 at the discharge pressure of the pump 6, the air supply port 3 a of the combustion cylinder 3 is supplied with air blown from the swirling blade 5 by the combustion fan 1. Air supply port 3 in the oblique direction along the flow direction
The distance a is narrowed and the side distance between the air supply ports 3a is widened, so that the inclined row of small holes 8 enables stable combustion.

A bottomed cylindrical combustion cylinder 3 is disposed in a blower cylinder 2 to which combustion air is sent by a combustion fan 1, and a number of air supply ports 3 a are provided on the side wall of the combustion cylinder 3. A fuel inlet 4 is provided at the center, and a swirl vane 5 is provided around the fuel inlet 4, and the atomized fuel is supplied into the combustion cylinder 3 by the discharge pressure of the fuel pump 6 while looking into the fuel inlet 4. In a petroleum burner equipped with a fuel spray nozzle 7 to be mounted, a part of an air supply port 3a of a combustion cylinder 3 is arranged in a plurality obliquely arranged along a flow direction of air blown from a swirler 5 by a combustion fan 1. Stable combustion is also enabled by the slit-shaped holes 9.

A bottomed tubular combustion tube 3 is disposed in a blower tube 2 to which combustion air is sent by a combustion fan 1, and a number of air supply ports 3 a are provided on the side wall of the combustion tube 3. A fuel inlet 4 is provided at the center, and a swirl vane 5 is provided around the fuel inlet 4, and the atomized fuel is supplied into the combustion cylinder 3 by the discharge pressure of the fuel pump 6 while looking into the fuel inlet 4. In a petroleum burner equipped with a fuel spray nozzle 7 to be mounted, a part of an air supply port 3a of a combustion cylinder 3 is formed by a cutting process that opens in a flow direction of air blown from a swirler 5 by a combustion fan 1. And the swirl hole 10
By forming a swirling airflow toward the front of the combustion tube 3 along the inner wall surface of the combustion tube 3, the combustion air is supplied along the inner wall surface of the combustion tube 3 to prevent soot from adhering.

Further, a bottomed cylindrical combustion cylinder 3 disposed in a blower cylinder 2 to which combustion air is sent by a combustion fan 1 is provided.
The diameter of the front cylinder 3b disposed at the tip of the blower cylinder 2 is set to be large, the diameter of the rear cylinder 3c near the bottom plate is set to be small, and the discharge capacity of the fuel pump 6 for supplying pressurized fuel to the fuel spray nozzle 7 is improved. When the amount of combustion is reduced, combustion is performed by a small-diameter rear cylinder 3c having an inclined air supply port 3a, and when the amount of combustion is increased, a flame is generated from a side wall of a large-diameter front cylinder 3b. Complete combustion is enabled by air supplied to the side.

[0013]

When the fuel pump 6 is operated, ignited atomized fuel is blown into the combustion cylinder 3 from the fuel spray nozzle 7, and a part of the atomized fuel is vaporized by combustion heat and diffuses in front of the swirl vanes 5. I do. On the other hand, a part of the combustion air sent by the combustion fan 1 is directed when passing through the swirling blade 5, blows out forward while creating a rotational flow in the combustion tube 3, and diffuses into the front surface of the swirling blade 5. The combustible gas is burned while forming a ring-shaped flame by this air flow.

Even after the ignition device is stopped, the atomized fuel continues to be burned by the ring-shaped fire of the swirl vanes 5,
Air is supplied to the combustion flame from a large number of air supply ports 3a in the side wall of the combustion cylinder 3, and the flame burns with a short flame while blowing forward from the center of the combustion cylinder 3. Since the amount of air required for the combustion of the atomized fuel is determined by the combustion stage, the diameter and the number of the air supply ports 3a on the side wall of the combustion cylinder 3 are limited and cannot be increased more than necessary.

The air supply port 3a of the present invention has a small hole array 8 inclined by narrowing the interval in the flow direction of the air blown from the swirling blades 5 and widening the interval between the side air supply ports 3a. Although it is formed, the total amount of air to be supplied is kept unchanged by making the number of holes and the size substantially the same as those of the related art. According to the way of opening the air supply port 3a, the combustion gas burned by the air blown from the innermost air supply port 3a is supplied to the next air supply port 3a having a narrow interval.
a, the atmosphere temperature is maintained at a high temperature, the combustion near the next air supply port 3a is promoted, and the combustion flame further approaches the side wall of the combustion tube 3 to maintain the side wall of the combustion tube 3 at a high temperature. In addition to enabling combustion, the size of the combustion flame can be further reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure will be described with reference to the drawings showing an embodiment. Reference numeral 1 denotes a combustion fan for supplying combustion air to a burner A;
Reference numeral 3 denotes a cylindrical blower tube to which the combustion air from the combustion fan 1 is sent, and 3 denotes a bottomed cylindrical combustion tube which is located in the blower tube 2 with its tip located at the tip of the blower tube 2. The cylinder 3 is provided with a number of air supply ports 3a on the side wall. Reference numeral 4 denotes a fuel inlet provided on the bottom plate of the combustion cylinder 3 having a bottomed cylindrical shape, and reference numeral 5 denotes a swirler provided on a bottom plate around the fuel inlet 4.

Numeral 7 denotes a combustion spray nozzle which is mounted in the bottom plate of the combustion tube 3 so as to be viewed from the fuel inlet 4, 11 denotes a fuel pipe connecting between a fuel tank (not shown) and the fuel spray nozzle 7, and 6 denotes a fuel pipe. A fuel pump attached to a fuel pipe 11 close to the spray nozzle 7. When the fuel pump 6 is operated, fuel in a fuel tank (not shown) is pressurized by the fuel pump 6 and sent to the fuel spray nozzle 7, and the fuel inlet 4 The fuel is then sprayed into the combustion cylinder 3 as mist fuel.

Numeral 12 designates a fuel spray nozzle 7 and a combustion cylinder 3 at the tip.
A discharge ignition device positioned between the fuel inlet 4 and
In this type of pressure-sprayed oil-fired combustor, when the operation switch is operated, the combustion fan 1 starts to rotate, and then the discharge igniter 12 operates to generate a discharge spark from the electrode at the tip, and then the fuel pump When the nozzle 6 is operated, the mist fuel is ejected from the fuel spray nozzle 7. The mist fuel is ignited by the discharge spark, and the flame is blown into the combustion tube 3.

Since the combustion fan 1 has been rotating since the start of operation, the combustion air is supplied to the fuel inlet 4 and the swirl vanes 5.
And air from the air supply port 3a on the side wall of the combustion cylinder 3 into the combustion cylinder 3 and air from the vicinity of the tip of the blower cylinder 2 into the combustion cylinder 3 from the combustion cylinder 3 to the burner. The combustion is performed so as to blow out the combustion flame toward the combustion chamber in front of A.

On the other hand, the air sent from the swirler 5 is blown obliquely by the swirler 5 to form an airflow rotating toward the combustion chamber while rotating inside the combustion tube 3. A part of the ignited mist fuel blown into the combustion tube 3 from the fuel inlet 4 is vaporized by combustion heat, turned into combustible gas, and diffused in front of the swirling blade 5, and this combustible gas is swirled. It burns by the air blown out from between the blades 5 to form a ring-shaped flame attached to the swirling blades 5. For this reason, even if the discharge ignition device 12 is stopped after ignition is confirmed, the combustion flame can be maintained without interruption by the ring-shaped fire on the front surface of the swirling blade 5.

The combustion flame in the combustion tube 3 is directed by the air flow blown out from the swirling blades 5 and blows forward while creating a rotational flow. The combustion flame is blown out from the air supply port 3 a in the side wall of the combustion tube 3. Since the air is supplied to the side of the flame, the combustion flame is located at the center of the combustion tube 3 to promote combustion,
It is burning in a short flame forward while rotating in a spiral.

The amount of air supplied from the air supply port 3a opened in the side wall of the combustion cylinder 3 depends on the calorific value of the oil combustor and the shape of the burner. It is almost decided by the stage. Conventionally, if the combustion flame touches the side wall of the combustion cylinder 3, soot may be attached. Therefore, the air supply ports 3 a are uniformly arranged on the side wall of the combustion cylinder 3, and the combustion flame is located at the center of the combustion cylinder 3. Easy to use.

As a result, the atomized fuel can be completely burned with a short flame, but the temperature of the combustion flame rises and NOx
In addition, there is a problem that the generation amount of the fuel increases, and when the fuel flow rate and the combustion air amount that are expected to fluctuate due to temperature change, or when the rotation speed of the combustion fan 1 changes for some reason, the combustion balance is easily lost. Problem arises. When the combustion balance is lost, the combustible gas generated from the mist fuel to be flown into the combustion chamber on the swirling air flow is generated.
This combustible gas cannot supply sufficient oxygen and causes incomplete combustion, generating hydrocarbon gas and soot, and generates the hydrocarbon gas and soot to the inner wall of the combustion cylinder 3 and the inner wall of the combustion chamber. Was completely black.

According to the present invention, a burner capable of maintaining complete combustion even if the combustion balance is slightly lost is obtained. The amount of air required for the combustion of the atomized fuel is determined by the combustion stage. Even if there is a restriction that the diameter and the number of the air supply ports 3a cannot be increased and the amount of air cannot be increased more than necessary, the problem can be solved by opening the air supply ports 3a. Reference numeral 8 denotes a row of small holes of the air supply ports 3a arranged obliquely along the airflow blown from the swirling blades 5. By reducing the spacing and increasing the spacing between the lateral air holes, the variation in the total amount of supplied air remains almost unchanged.

In a conventional pressure spray burner using the combustion tube 3, the idea was to supply air from the side of the combustion flame extending forward from the swirling blades 5 to form a combustion flame in the central portion of the combustion tube 3. However, in such a combustion method, the number of air holes forming the air supply port 3a is too small to completely burn the combustible gas diffused to the side wall portion of the combustion cylinder 3 by losing the combustion balance. The combustible gas diffused into the non-existing portion turned into soot. Also, in order to increase the number of the air supply ports 3a and make it difficult for soot to adhere, it is necessary to reconsider the ratio of air supplied from other portions into the combustion cylinder 3, and must sacrifice combustion in a normal state. did not become.

According to the present invention, the combustion flame is not located at the central portion of the combustion tube 3 but, despite the small air supply amount,
Create a combustion state that makes the combustion flame approach the combustion cylinder 3,
By increasing the temperature of the combustion cylinder 3, the generation of soot is suppressed, and the combustible gas diffused near the combustion cylinder 3 is completely burned by air blown from the air supply port 3a while flowing along the wall surface.

That is, when the row of small holes 8 is formed so as to be inclined along the air flow directed by the swirling vanes 5, the combustible gas diffused in the vicinity of the innermost air supply port 3a is discharged from the air supply port 3a. The combustion gas generated by combustion by the blown air flows near the next narrow air supply port 3a to maintain the ambient temperature at a high temperature. The combustion is promoted, and the combustion flame comes to approach the side wall of the combustion tube 3. If the air supply ports 3a are uniformly formed as in the related art, even if the space between the air supply ports 3a is large and the combustion gas flows, the air is cooled by the combustion tube 3 and eventually all the air supply ports 3a are located at the innermost position. The combustion is the same as that of the air supply port 3a near the swirling blade 5, and the combustion flame is separated from the combustion tube 3.

For this reason, the inclined small hole array 8 is formed, and the interval between the side air holes is widened and the interval between the air holes in the inclined direction is narrowed instead. Without greatly changing the amount of air to be consumed, the combustion flame
Thus, it was possible to perform combustion while keeping the wall surface of the combustion cylinder 3 at a high temperature. The combustible gas receives the heat of the combustion cylinder 3 even when the supply of air is small, maintains a high temperature state, and is less likely to become soot.
Since combustion is performed by air sent from the air supply port 3a while flowing near the wall surface of the combustion cylinder 3 in a state of high-temperature combustible gas, generation of incomplete combustion gas and soot can be prevented.

Reference numeral 9 denotes a plurality of slit-shaped holes constituting the air supply port 3a. The slit-shaped holes 9 are inclined so as to form slits in the flow direction of the air blown from the swirling blades 5. It is arranged. In addition, the slit-shaped hole 9
May be arranged side by side on the wall of the combustion tube 3 and may be continuous with the same inclined slit holes 9 at small intervals toward the front. Furthermore,
Instead of making the slit-shaped holes 9 continuous, the air supply port 3a may be constituted by the air holes arranged along the flow direction of the air blown from the swirling blades 5 and the slit-shaped holes 9.

When such an air supply port 3a is constituted by the slit-shaped hole 9, the combustible gas diffused in the vicinity of the slit-shaped hole 9 is burned by the air supplied from the slit-shaped hole 9, but this flame is generated by the slit. The combustion tube 3 can be maintained at a high temperature because the flame is formed not only to approach the slit-shaped hole 9 but also to adhere to the slit-shaped hole 9. For this reason, the combustible gas diffused toward the combustion cylinder 3 between the two slit holes 9 arranged side by side is maintained at a high temperature, and flows along the wall surface of the combustion cylinder 3 by air sent from the slit holes 9. Since combustion occurs, generation of incomplete combustion gas and soot can be prevented.

Reference numeral 10 denotes a swirl hole which constitutes an air supply port 3a of the combustion tube 3. The swirl hole 10 is formed by a plurality of cut-off airs which open in the flow direction of air blown from the swirler blades 5. The air is supplied from a plurality of swirling holes 10 along the flow direction of the air blown from the swirling blades 5.

When the air supply port 3a is constituted by the swirl hole 10 formed by cutting, the air blown into the combustion cylinder 3 from the blower cylinder 2 flows along the inner wall surface of the combustion cylinder 3. When the combustible gas diffuses and flows near the swirl hole 10, the combustible gas is burned by the air supplied from the swirl hole 10. At this time, since the air in the swirl hole 10 is supplied along the inner wall surface of the combustion tube 3 in the flow direction of the air sent from the swirl blade 5, the combustion flame approaches the swirl hole 10 and eventually adheres. When the combustion is performed, a flame is formed at a position along the inner wall surface of the combustion cylinder 3, and the combustion cylinder 3 is maintained at a high temperature.

As described above, according to the present invention, the total opening area of the air supply port 3a of the combustion cylinder 3 is kept substantially the same as that of the conventional air supply port so as not to break the balance of the air sent to each part of the burner. By devising the opening of 3a, the position of the combustion flame can be made to approach the combustion cylinder 3 without causing incomplete combustion.

Specifically, attention is paid to the flow of air by the swirl vanes 5, and an air supply port 3a is arranged so that a combustion flame can be continuously formed in a direction along the flow of air.
The high temperature combustion gas is sent to the adjacent air holes by utilizing the gas flow by the swirling blades 5 to promote the combustion near the adjacent air holes, and the combustion flame is generated even when the number of the air supply ports 3a is small. Thus, the temperature of the combustion cylinder 3 could be increased by receiving the heat of the combustion flame.

Therefore, even if the balance between the combustion air amount and the fuel flow rate is slightly broken, and the combustible gas diffuses to the inner wall surface of the combustion tube 3, the combustion tube 3 cools down and causes incomplete combustion. The problem was improved, and the combustion cylinder was maintained at a high temperature. Thus, even if the combustible gas was touched, hydrocarbon gas and soot were not immediately precipitated, and the deterioration of the combustion state could be prevented.

Since oxygen in the air supplied from the air supply port 3a is also used to combust the combustible gas diffused near the wall surface of the combustion tube 3, the flame does not concentrate at the center of the combustion tube 3 Combustion began to be performed using the entirety of No. 3, and combustion that maintained the temperature of the combustion flame at a low level became possible.
In addition, not only fresh air but also exhaust gas used for combustion is sent to the combustion flame in the central portion and mixed combustion is performed, so that the generation amount of NOx can be reduced.

Reference numeral 3b denotes a front cylinder of the combustion cylinder 3 whose leading end is connected to the front of the ventilation cylinder 2;
b, the rear part of which is connected to the bottom plate provided with the revolving blades 5, and the diameter of the front part cylinder 3b is larger than the diameter of the rear part cylinder 3c. The inclined air supply port 3a is mainly provided in the rear cylinder 3c and has a large diameter.
The air supply port 3a of b may be opened in a staggered manner as in the case of the conventional product, or may be provided obliquely along the flow of air by the swirling blades 5 like the rear cylinder 3c.

The shape of the combustion cylinder 3 has no step and the rear cylinder 3
In the case of the shape composed only of c, if the maximum calorific value of the burner is increased, a long flame is generated from the combustion cylinder 3 toward the combustion chamber for combustion. However, as in the embodiment of the present invention, the front cylinder 3b
Is provided, combustion air can be supplied from the side to the combustion flame blown out from the rear cylinder 3c, so that combustion in the front cylinder 3b is promoted and the overall shape of the combustion flame can be shortened. The difference between the maximum and minimum calorific values of the burner can be increased by the means for varying the discharge capacity of the fuel pump 6, and the burner can be finished easily.

[0039]

As described above, according to the present invention, the swirling blades 5 are arranged on the bottom plate of the combustion cylinder 3 having a bottomed cylindrical shape, and the row of small holes is inclined in a direction coincident with the flow of air sent from the swirling blades 5. Since the small holes 8 are provided, the combustion gas generated in the vicinity of the air holes follows the air flow of the swirling blades 5 and flows to the next air holes at a high temperature to promote combustion even if the interval between the small hole arrays 8 is wide. Can approach the inner wall of the combustion cylinder 3 to increase the temperature of the combustion cylinder 3 and maintain the temperature of the combustion cylinder 3 high. For this reason, even if the interval between the small hole rows 8 is widened and the combustible gas diffuses into this portion, the temperature can be maintained high, so that complete combustion is gradually approached without generating incomplete combustion gas or soot immediately. Thus, unlike the conventional case, incomplete combustion does not occur immediately even if the balance between the combustion air and the combustion flow rate is slightly disturbed.

Even with the air supply port 3a having a limited opening area, the combustion flame spreads to the side wall without being concentrated at the central portion of the combustion tube 3 and burns. This is because the temperature is lowered and the generation amount of NOx is reduced. Further, in the conventional structure, the combustion at the side wall portion of the combustion tube 3 is not so much performed by the air sent from the air supply port 3a, and the air is supplied to the combustion flame at the central portion of the combustion tube 3. Since the combustion in the vicinity of the air supply port 3a is promoted, the combustion exhaust gas is supplied to the combustion flame in the central portion by riding on the airflow. Therefore, the combustion exhaust gas is also sent to the combustion flame together with the air. The emission amount of NOx is reduced as in a burner that recirculates gas.

In the conventional combustion in which the combustion flame is positioned at the center of the combustion tube 3, if the rotation speed of the combustion fan 1 is reduced, the combustion flame positioned at the center is significantly extended. In this case, the combustion spreads to the side wall portion of the combustion tube 3 and the combustion is performed. Therefore, even if the rotation speed of the combustion fan 1 decreases, the flame is slightly extended along the side wall of the combustion tube 3 as a whole, and the generation of carbon disappears. It is.

Further, when the combustion flame is concentrated at the center of the combustion tube 3 and the combustion is performed, the combustion is rapidly accelerated by the supply of air from the surroundings, and the noise during the combustion is increased. However, since the combustion is not concentrated at the center and is slowly burned using the entire combustion cylinder 3, the generated combustion noise is also reduced.

Further, a specific air supply port 3a of the combustion cylinder 3
In the opening method, when a continuous slit-shaped hole 9 is formed instead of the small hole array 8, the flame in which the combustible gas diffused near the side wall of the combustion cylinder 3 burns continues along the slit. The combustion cylinder 3
Temperature can be kept high.

In the opening of the air supply port 3a of the other combustion cylinder 3, the swirl hole 10 may be formed by cutting instead of the small hole array 8 or the slit-shaped hole 9. The direction is made to correspond to the flow direction of the air blown out by the swirling blade 5. For this reason, the air sent by the blower fan 1 blows out in the direction of the swirling airflow of the swirling blade 5. As a result, a stable flame can be formed in a portion near the inner wall surface of the combustion cylinder 3, and the combustion cylinder 3 can be maintained at a high temperature.

Further, the structure of the bottomed cylindrical combustion cylinder 3 is as follows.
It may be divided into a large-diameter front cylinder 3b and a small-diameter rear cylinder 3c provided on the way through a stepped portion. Since air is supplied to the combustion flame from the front cylinder 3b, combustion is performed with a short flame even when the calorific value of the burner is increased, and when the fuel flow rate blown out from the fuel spray nozzle 7 is greatly varied. Can burn with short flames,
The range of application is also extended to a variable burner burner.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a pressure spray type oil combustor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a burner portion of a pressure spray type oil combustor showing another embodiment of the present invention.

FIG. 3 is a front view of parts of a burner of the pressure spray type oil-fired combustor of the embodiment shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion fan 2 Blower cylinder 3 Combustion cylinder 3a Air supply port 3b Front cylinder 3c Rear cylinder 4 Fuel inlet 5 Swirl vane 6 Fuel pump 7 Fuel spray nozzle 8 Small hole array 9 Slit hole 10 Swirl hole

Claims (4)

[Claims] 1. A bottomed tubular combustion cylinder 3 is arranged in a blower cylinder 2 to which combustion air is sent by a combustion fan 1, and a number of air supply ports 3 a are provided on a side wall of the combustion cylinder 3. A fuel inlet 4 is provided at the center, and a swirl vane 5 is provided around the fuel inlet 4, and the atomized fuel is supplied into the combustion cylinder 3 at the discharge pressure of the fuel pump 6 through the fuel inlet 4. In a petroleum burner equipped with a fuel spray nozzle 7, the air supply port 3 a of the combustion cylinder 3 narrows the interval between the air supply ports 3 a in the oblique direction along the flow direction of the air blown from the swirling blades 5 by the combustion fan 1. A pressure atomizing petroleum combustor characterized in that the side gap between the air supply ports 3a is widened to form an inclined row of small holes 8. 2. A combustion cylinder 3 having a bottomed cylindrical shape is arranged in a blower cylinder 2 to which combustion air is sent by a combustion fan 1, and a number of air supply ports 3a are provided on a side wall of the combustion cylinder 3; A fuel inlet 4 is provided at the center, and a swirl vane 5 is provided around the fuel inlet 4, and the atomized fuel is supplied into the combustion cylinder 3 at the discharge pressure of the fuel pump 6 through the fuel inlet 4. In a petroleum burner equipped with a fuel spray nozzle 7 to be mounted, a part of an air supply port 3 a of a combustion cylinder 3 is arranged in a plurality of diagonally arranged along a flow direction of air blown from a swirler 5 by a combustion fan 1. A pressure-spray type oil burner characterized by comprising slit-shaped holes 9. 3. A bottomed cylindrical combustion cylinder 3 is arranged in a blower cylinder 2 to which combustion air is sent by a combustion fan 1, and a number of air supply ports 3a are provided on a side wall of the combustion cylinder 3; A fuel inlet 4 is provided at the center, and a swirl vane 5 is provided around the fuel inlet 4, and the atomized fuel is supplied into the combustion cylinder 3 at the discharge pressure of the fuel pump 6 through the fuel inlet 4. A part of the air supply port 3a of the combustion cylinder 3 is formed by a cutting process that opens in the flow direction of the air blown from the swirl vanes 5 by the combustion fan 1 in a petroleum burner equipped with a fuel spray nozzle 7 to be turned on. A pressure spray type oil combustor characterized by comprising a swirl hole (10), wherein the swirl hole (10) forms a swirling airflow along the inner wall surface of the combustion cylinder (3) toward the front of the combustion cylinder (3). 4. A bottomed tubular combustion cylinder 3 disposed in a blower cylinder 2 to which combustion air is sent by a combustion fan 1 has a larger diameter than a front cylinder 3b disposed at the tip of the blower cylinder 2. 3. The fuel supply system according to claim 1, wherein the diameter of the rear cylinder in the vicinity of the bottom plate is set to be small, and a discharge capacity of the fuel pump for supplying pressurized fuel to the fuel spray nozzle is changed. Item 3. A pressure atomizing oil burner according to Item 3.