JP3037078B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum vaporizing liquid fuel combustion apparatus mainly used for a petroleum fan heater or the like.

[0002]

2. Description of the Related Art FIG.
As shown in FIG. 1, an electric heater for vaporization 1 is embedded in a peripheral wall portion, and a bottomed cylindrical vaporizing cylinder 4 provided with an air inlet 2 and a fuel nozzle 3 in a part of the peripheral wall portion. A plurality of flame holes 5, which are attached to the upper opening of
5 is divided into a plurality of upper and lower stages and a cylindrical burner head 6 provided on a peripheral wall 6A and a mixed gas vaporized and premixed in the vaporizing cylinder 4 are guided into the burner head 6 through a throttle passage 7A provided in a central portion. A diaphragm plate 7;
On the bottom wall 6B of the burner head 6 placed on the upper surface of the burner head 7, a large number of ventilation holes 8 for guiding the mixed gas passing through the throttle passage 7A of the throttle plate 7 into the burner head 7 are formed.

[0003]

In the liquid fuel combustion apparatus having such a configuration, liquid fuel such as kerosene or the like jetted from the fuel nozzle 3 is heated to a high temperature by the electric heater 1 for vaporization or combustion heat. The vaporized gas comes into contact with the inner wall surface of the vaporizing cylinder 4 and is vaporized. The vaporized gas is premixed in the vaporizing cylinder 4 with the primary air sent from the air inlet 2 into the vaporizing cylinder 4. After flowing into the burner head 6 through the throttle passage 7A and the vent holes 8 in the bottom wall 6B of the burner head 6, the fuel flows out of the flame holes 5 and burns.

In a liquid fuel combustion apparatus in which an air inlet 2 is provided in a part of the peripheral wall of the vaporizing cylinder 4, the air inlet 2
The air sent into the vaporizing cylinder 4 from the air flows in a swirling shape along the inner wall surface of the vaporizing cylinder 4 and mixes with the vaporized gas, and
When it reaches a position distant from the air inlet 2, the air flows from there toward the throttle passage 7A of the throttle plate 7, and the throttle passage 7A
Pass through. Here, the air amount of the mixed gas flowing into the throttle passage 8A tends to be large on the side facing the air inlet 2 and small on the side of the air inlet 2 as shown by arrows A and B in FIG. Flame hole 5 on the side opposite to air inlet 2
In this case, a mixed gas with an excessive amount of air that is easy to lift is easily ejected, and a mixed gas with an insufficient amount of air that easily causes red fire is easily ejected from the flame hole 5 on the air inlet 2 side. As described above, when the flame formed in the flame holes of the burner head is non-uniform, the combustion noise increases and the amount of generated CO increases. Therefore, in the conventional liquid fuel combustion apparatus, as shown in FIG. 7, a large number of ventilation holes 8 are formed in the bottom wall 6B of the burner head 6 to stabilize and uniform the flame. Further, in the case where a throttle passage is formed in the bottom wall of the burner head (for example, Japanese Utility Model Application Laid-Open No. 61-9230), an equalizing plate having a number of small holes formed in a lower portion inside the burner head so as to cover the throttle passage. The above-mentioned problems have been solved.

In recent years, a flame hole from which a mixed gas is ejected is formed as a small hole having a size of about 3 to 5 mm, and the flame hole is divided into a plurality of upper and lower stages on a peripheral wall of a burner head, so that a large combustion amount is obtained. The mainstream is to solve the lifting phenomenon and the problem of heat breakage of the flamehole wire mesh over a wide range from combustion to weak combustion with a very small amount of combustion so that the combustion can be controlled in a wide range. In the liquid fuel combustion device having such a configuration, the maximum combustion amount is about 4000
In the case of a high calorie type of about Kcal / h, it is necessary to increase the area of a flame hole compared with a low calorie type having a maximum calorific value of about 2500 Kcal / h, and the height of the burner head is made higher than before. And the space inside the burner head is increased by the height. For this reason, when the combustion power is reduced to weakly burn, the mixed gas stagnates in the vicinity of the upper center in the burner head,
There was concern that flashback would occur due to this stagnation.
In order to prevent the occurrence of such flashback, it can be solved by incorporating various built-in components in the burner head, but in that case, the internal structure of the burner head becomes complicated, and the number of parts and work steps increase, This results in a significant cost increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and aims to make uniform the flames formed in the respective flame holes, reliably prevent the occurrence of flashback, and furthermore, the inside of the burner head. It is an object of the present invention to provide a liquid fuel combustion device that can prevent the structure from becoming complicated.

[0007]

According to the first aspect of the present invention, a vaporizing cylinder provided with an air inlet and a fuel nozzle in a peripheral wall portion, and a flame hole which is mounted on an upper portion of the vaporizing cylinder and in which a mixed gas is ejected, are provided. A cylindrical burner head which is divided into a plurality of upper and lower stages and is provided on a peripheral wall, a throttle portion which guides the mixed gas in the vaporizing cylinder into the burner head through a throttle passage provided in a central portion, and a throttle passage of the throttle portion is covered. Installed in the burner head,
A substantially convex mixing and rectifying cylinder having a cylindrical portion at the center and having an annular flat portion on the outer periphery at the lower portion is provided. Is provided with a large number of small holes.

According to the second aspect of the present invention, the vaporizing cylinder provided with the air inlet and the fuel nozzle on the peripheral wall portion, and the flame hole which is mounted on the vaporizing cylinder and through which the mixed gas is ejected, is divided into a plurality of upper and lower stages. A cylindrical burner head provided on the peripheral wall, a throttle portion for guiding the mixed gas in the vaporizing cylinder into the burner head through a throttle passage provided at the center, and a burner head inside the burner head so as to cover the throttle passage of the throttle portion. A substantially convex mixing and rectifying cylinder having a heavenly cylindrical part in the center and an annular flat part on the outer periphery of the lower part, wherein the mixing rectifying cylinder has a top surface part of the heavenly cylindrical part and an annular plane A large number of small holes are provided in each of the portions, and the height of the top surface portion of the heavenly cylindrical portion is set to be substantially the same as the uppermost flame hole row of the burner head, or higher, and , The height of the annular flat part is lower than the bottom row of burners of the burner head It is set Configurations.

[0009]

With this configuration, the mixed gas from the vaporizing cylinder flows into the substantially convex mixing and rectifying cylinder disposed in the burner head through the throttle passage of the throttle section. Then, a part of the mixed gas flowing into the mixing rectification cylinder flows toward the lower flame hole through a number of small holes provided in the annular flat portion,
The gas is blown out from each of the lower flame holes and burned.
It rises inside the cylindrical head portion, flows toward the upper flame hole through a number of small holes provided on the top surface portion thereof, and is ejected from each upper flame hole to burn. Here, a uniform gas mixture flows through a number of small holes in each of the upper and lower flame holes, so that each flame hole is stable along the entire circumference of the burner head. A uniform flame is formed.

A substantially convex mixing and rectifying cylinder is disposed in the burner head, and a large number of small holes for allowing mixed gas to pass therethrough are provided on the top surface of the eccentric cylindrical portion of the mixing and rectifying cylinder. Even if the height is set relatively high, there is no place in the burner head where stagnation of the mixed gas occurs, and even if the combustion amount is adjusted to a very small weak combustion, a flashback can be prevented.

Further, by simply incorporating a one-part mixed rectifying cylinder in the burner head, the flame can be made uniform and the occurrence of flashback can be prevented, so that the internal structure of the burner head can be prevented from becoming complicated.

[0012] In the liquid fuel combustion apparatus according to the second aspect, the height of the top surface of the eccentric cylindrical portion of the mixing and rectifying cylinder is:
Since it is set to be substantially the same as or higher than the uppermost row of burner heads, and the height of the annular flat portion is set lower than the lowermost row of burner heads, The burner not only allows the mixed gas to flow smoothly through the small holes provided in the flat part to the flame holes in the lowermost flame hole row, but also heats the top surface of the cylindrical tube to a high temperature by combustion. You can approach the top panel of the head,
The temperature of the mixed gas that has dropped in temperature when rising inside the eccentric cylindrical portion is raised again so that the mixed gas is not liquefied inside the burner head.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 10 denotes a bottomed cylindrical vaporizing cylinder made of aluminum die-cast with an open top, and the vaporizing cylinder 10 is made of an Al-Mn-based aluminum alloy having excellent heat resistance. An air inlet 11 is provided in a part of the peripheral wall portion 10 so as to open in a tangential direction of the peripheral wall portion. Reference numeral 12 denotes an electric heater for vaporization such as a sheath heater embedded in the upper part of the peripheral wall of the vaporizing cylinder 10. Reference numeral 13 denotes a primary air cylinder having one end connected to the air inlet 11 of the vaporizing cylinder 10. The other end is connected to a casing 17 of a blower 16 having a built-in air supply fan 15 driven by a motor 14.

Reference numeral 18 denotes a bottomed cylindrical burner case provided on the outer periphery of the vaporizing cylinder 10, and 19 denotes a secondary air pipe for sending secondary combustion air into a space X between the burner case 18 and the vaporizing cylinder 10. The secondary air pipe 19 is connected to the casing 17 of the blower 16 like the primary air cylinder 13. 2
Numeral 0 denotes an injection needle-shaped fuel nozzle which is concentrically disposed in the air inlet 11 and one end of the primary air cylinder 13, and the fuel nozzle 20 has its tip jet port 20 </ b> A inside the vaporization cylinder 10. A liquid fuel such as kerosene is vaporized in cylinder 1
0, and the other end is connected to a fuel tank 23 via a fuel supply pipe 21 and a fuel pump 22 such as an electromagnetic pump.
It communicates with the inside. Reference numeral 24 denotes a detachable cartridge tank for replenishing the fuel tank 23 with liquid fuel.

Reference numeral 25 denotes a diaphragm plate made of aluminum die-cast which is fitted and mounted on the upper opening of the vaporizing cylinder 10. The diaphragm plate 25 is made of an Al-Mn-based aluminum alloy having the same excellent heat resistance as the vaporizing cylinder 10. This diaphragm plate 25 is made
A cylindrical portion 26 forming a throttle passage 25A is integrally formed in a central portion of the outer peripheral portion, and an annular convex portion 27 is integrally provided on an upper surface side of an outer peripheral portion. 28 is an aperture plate 25
Is a disk-shaped baffle plate disposed immediately below the cylindrical portion 26 of
There is an interval from the cylindrical portion 26.

Numeral 29 denotes a celestial cylindrical burner head mounted on the upper part of the vaporizing cylinder 10.
Is a top plate 29 by drawing of a heat-resistant stainless steel plate.
A and the peripheral wall portion 29B are integrally formed, and the peripheral wall portion 29B has a large number of flame holes 30, 3 for jetting a mixed gas.
0 is provided. Also, the large number of flame holes 30, 30
As shown in FIG. 6, is divided into three upper and lower stages and is provided on the peripheral wall portion 29B of the burner head 29. Each of the flame holes 30, 30 in each of the flame hole rows a, b, c is It is formed by a small round hole having a diameter of about 5 mm. Reference numeral 31 denotes one ignition flame hole drilled below the flame holes 30 of the lower flame hole row c, and the ignition flame holes 31 are formed by round holes smaller than the respective flame holes 30. . Reference numerals 32 and 32 denote flame nets provided in close contact with the inner and outer surfaces of the peripheral wall 29A of the burner head 29.

Reference numeral 33 denotes a mixing rectification cylinder disposed in the burner head 29 so as to cover the restriction passage 25A of the restriction plate 25 from above. The mixing rectification cylinder 33 is formed by drawing a heat-resistant stainless steel plate from the side. It is formed in a substantially convex shape when viewed. The mixing rectifying plate 33 has a diameter of about 2 mm on each of the top surface portion 34A of the eccentric tubular portion 34 provided at the center thereof and the annular flat portion 35 provided on the lower outer periphery.
Are provided, and the peripheral wall portion 34B of the heavenly cylindrical portion 34 is a non-porous wall.

The eccentric cylindrical portion 34 of the mixing rectifying cylinder 33 includes:
The diameter of the diaphragm passage 25A of the diaphragm plate 25 is larger than the diameter of the diaphragm passage 25A.
The height of the top surface portion 34A is set to be substantially the same as the upper flame hole row a of the burner head 29, and the height of the annular flat portion 35 is set lower than the lower flame hole row c of the burner head 29. The throttle plate 25, the burner head 29, and the mixing and rectifying cylinder 33 are fixed to the vaporizing cylinder 10 with a plurality of mounting screws 38.

Reference numeral 39 denotes a combustion ring disposed on the outer periphery of the burner head 29. The combustion ring 39 is made of a heat-resistant stainless steel plate, and is mounted on the upper end of the vaporizing cylinder 10 and is screwed (not shown). Zu) has been stopped. The annular wall 39A of the combustion ring 39 facing the peripheral wall 29A of the burner head 29 is provided with a plurality of vertical slits 40 at predetermined intervals in the circumferential direction. Reference numeral 41 denotes a flame rod for detecting the presence / absence of the flame F and an oxygen concentration, and reference numeral 42 denotes an ignition rod. The discharge end of the ignition rod 42 is opposed to the ignition flame hole 31.
43 is a combustion cylinder.

In the above configuration, the electric heater for vaporization 1
When the temperature of the vaporizing cylinder 10 rises to a temperature equal to or higher than the vaporizable temperature of the liquid fuel by energizing the fuel cell 2, the blower 16 and the fuel pump 22 operate, and the liquid fuel from the fuel nozzle 20 via the fuel supply pipe 21 and the primary air cylinder 13 through the air inlet 11
, Primary air for combustion is supplied into the vaporization cylinder 10.

Here, the fuel supplied into the vaporizing cylinder 10 contacts the inner wall surface of the vaporizing cylinder 10 and is vaporized, and the vaporized gas is mixed with the primary air to form a mixed gas. 25 through the throttling passage 25A.
3 flows into. A part of the mixed gas flowing into the mixing and rectifying cylinder 33 has a large number of small holes 37 in the annular flat portion 35.
37, and the middle 30 and the middle row d.
Flows toward each of the flame holes 30 and gushes out of each of the flame holes 30, and the rest rises in the heavenly cylindrical portion 34, and while mixing is promoted in the heavenly cylindrical portion 34, the top surface portion 34 </ b> A , A large number of small holes 36, 3
Go through 6. The mixed gas passing through the small holes 36, 36 flows along the lower surface of the top plate 29A of the burner head 29, and flows into each of the flame holes 30 in the upper flame hole row a and each of the flame holes 30 in the middle flame hole row b. Oppositely, it gushes from those flame holes 30. Thus, the mixed gas ejected from each of the flame holes 30 is ignited by the spark of the ignition rod 42 to form a flame F and start combustion.

Burner case 18 via secondary air pipe 19
The secondary air sent into the space X in the inside rises the space X, flows near the outer periphery of the combustion ring 39, and is supplied to the flame F to promote the secondary combustion. Then, the heat of Flame F
When the temperature of the vaporizing section of the vaporizing cylinder 10 is maintained at a temperature at which the liquid fuel can be vaporized by the recovered heat or directly by the vaporizing cylinder 10 via the combustion ring 39, the vaporizing electric heater 12 Although the power supply to is stopped, the combustion is continued.

According to the present embodiment, an approximately convex mixing rectifying cylinder 33 is disposed in the burner head 29 so as to cover the restricting passage 25A of the restricting plate 25, and the mixing rectifying plate 33 is provided at a central portion. A large number of small holes 3 having a diameter of about 2 mm
6, 36, 37 and 37 are provided, so that each of the flame holes 30 and 30 of each of the flame hole rows a, b and c provided on the peripheral wall portion 29B of the burner head 29 is divided into three upper and lower stages. Top 34
A and a number of small holes 36, 36, 37, 3 of the annular flat portion 35
7, the uniform mixed gas flows, so that a stable uniform flame F is formed over the entire circumference of the burner head 29 over a wide range from strong combustion to weak combustion, and combustion noise can be suppressed. CO generation can be suppressed.

The mixing and rectifying cylinder 33 disposed in the burner head 29 has a substantially convex shape in a side view.
Top part 34A of heavenly cylindrical part 34 provided in the central part of
By providing a large number of small holes 36 through which the mixed gas passes, even if the burner head 29 is heightened to provide a high calorie type with a maximum combustion amount of about 4000 Kcal / h, a large number of top surfaces 34A are provided. The small holes 36 allow the mixed gas to flow near the lower surface of the top plate 29A of the burner head 29. As a result, there is no place in the burner head 29 where the mixed gas stagnates, and the amount of combustion is reduced. 700Kc
Even if it is adjusted to a very small al / h weak combustion, a flashback can be prevented from occurring, and the combustion adjustment range is about 4000 Kcal.
/ H to about 700 Kcal / h. Further, by incorporating the mixing and rectifying cylinder 33, which is one component, into the burner head 29, the flame can be made uniform and the occurrence of flashback can be prevented.
The internal structure does not become complicated, and the cost increase can be suppressed.

The mixing rectifying cylinder 33 is provided with an eccentric tubular section 34.
Since the height of the top surface portion 34A is set to be substantially the same as the upper flame hole row a of the burner head 29, and the height of the annular flat portion 35 is set lower than the lower flame hole row c of the burner head 29, The gas mixture can smoothly flow through the small holes 37 provided in the annular flat portion 35 to the respective flame holes 30 of the lower flame hole row c and the middle flame hole row b.
The top surface portion 34A of the burner head 29 can be brought close to the top surface plate portion 29A of the burner head 29 which is heated to a high temperature by combustion. The top surface portion 34A of the top tube portion 34 and the top plate portion 29A of the burner head 29 can be raised again, so that there is no fear that the mixed gas is liquefied inside the burner head 29 or the mixing rectification tube 33, and the burner The accumulation of tar inside the head 29 can be suppressed.

In the above-described embodiment, the mixed rectifying cylinder 3
The height of the top surface portion 34A of the eccentric tubular portion 34 in 3 is substantially the same as the upper flame hole row a of the burner head 29, but may be set higher than the upper flame hole row a.

[0027]

As described above, according to the liquid fuel combustion apparatus of the present invention, a uniform mixed gas is ejected from each of the flame holes of the burner head by passing through a number of small holes, and the burner is burned. A stable and uniform flame is formed over the entire circumference of the head, and not only good combustion with low combustion noise can be performed, but also a high calorie type flashback is achieved by a single mixing and rectifying cylinder built into the burner head. Can be reliably prevented, the internal structure of the burner head does not become complicated, the structure is simple, and a stable combustion state from strong combustion to weak combustion can be obtained.

In the liquid fuel combustion device according to the second aspect, the mixed gas can be prevented from being liquefied inside the burner head or the mixing rectification cylinder, and the accumulation of tar inside the burner head can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the same.

FIG. 3 is a sectional view showing the entire configuration of the liquid fuel combustion device.

FIG. 4 is a plan view of the mixing and rectifying cylinder.

FIG. 5 is a half sectional side view of the mixing and rectifying cylinder.

FIG. 6 is a half sectional side view of the burner head.

FIG. 7 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vaporization cylinder 11 Air introduction port 20 Fuel nozzle 25 Throttle plate (throttle part) 25A Throttle passage 29 Burner head 29B Peripheral wall (peripheral wall) of burner head 30 Flame hole 33 Mixed rectification cylinder 34 Headed cylindrical part 34A Top surface part 35 Annular Flat part 36 Small hole 37 Small hole

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-79610 (JP, A) JP-A-4-121504 (JP, A) JP-A-4-155106 (JP, A) JP-A-6-106 26616 (JP, A) Japanese Utility Model Showa 55-80616 (JP, U) Japanese Utility Model Utility Model Hei 2-21422 (JP, U) Japanese Utility Model Showa 60-105928 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) F23D 11/40 F23D 11/10

Claims (2)

(57) [Claims] 1. A cylinder provided with an air inlet and a fuel nozzle on a peripheral wall thereof, and a cylinder mounted on an upper portion of the vaporizer and provided with a plurality of upper and lower flame holes through which a mixed gas is jetted and provided on the peripheral wall. -Shaped burner head, a constricted portion for guiding the mixed gas in the vaporizing cylinder into the burner head through a constricted passage provided in a central portion, and provided in the burner head so as to cover the constricted passage of the constricted portion. It has a substantially convex mixing and rectifying cylinder having an annular flat portion on the lower periphery and having an eccentric cylindrical portion. A liquid fuel combustion device comprising a small hole. 2. A vaporizing cylinder provided with an air inlet and a fuel nozzle in a peripheral wall thereof, and a cylinder mounted on an upper part of the vaporizing cylinder and having a plurality of upper and lower flame holes through which a mixed gas is blown, provided on the peripheral wall. -Shaped burner head, a constricted portion for guiding the mixed gas in the vaporizing cylinder into the burner head through a constricted passage provided in a central portion, and provided in the burner head so as to cover the constricted passage of the constricted portion. It has a substantially convex mixing and rectifying cylinder having an annular flat portion on the lower periphery and having an eccentric cylindrical portion. A small hole is provided, and the height of the top surface portion of the eccentric cylindrical portion is set to be substantially the same as or higher than the uppermost flame hole row of the burner head, and the height of the annular flat portion is set. Is set lower than the bottom row of burner heads. Liquid fuel combustion device.