JPS599134Y2 - Forced air pot vana - Google Patents

Description

[Detailed description of the invention] The purpose of this invention is to improve and eliminate the drawbacks of pot burners for generating hot air that have been used in grain dryers and the like, and to obtain a pot burner suitable for practical use.

Conventionally, in this type of pot burner, as shown in Fig. 1, a pot burner 3 is mounted on a burner mounting part 2 arranged in a ventilation shell 1, and a secondary combustion chamber is formed above the pot burner 3. A combustion tube 4 is installed, and by the action of an exhaust fan attached to the main body A,
An air flow is generated in the direction of the arrow in the ventilation barrel 1, and the primary combustion air of the pot burner 3 is also sucked in from the intake port of the burner mounting part 2 by the negative pressure generated in the combustion tube 4 in the ventilation barrel 1. It was distributed as such.

However, in such a structure, the amount of primary air supplied to the pot burner 3 is determined by the static pressure at the combustion tube 4 and the intake port of the burner mounting part 2 which is the primary air intake, as well as by the amount of primary air supplied to the pot burner 3. It is affected by the combustion pressure (explosion pressure) inside the burner 3.

For this reason, in the past, the amount of primary air was adjusted by manually operating the opening/closing shutter by changing the opening area of the primary air intake in response to an increase or decrease in the amount of combustion.
The ratio between the amount of fuel burned and the amount of air required for combustion (hereinafter referred to as the air-fuel ratio).

) is not easy to control to keep it accurate, and it has been pointed out that in farmers who use dryers, there are often operational errors such as fires caused by incomplete combustion, so such adjustment is appropriate. I cannot accept that.

Furthermore, in conventional pot burners, the primary air chamber is maintained at a negative pressure state, so the primary air flow circulating inside the pot burner is non-uniform in various parts, that is, there are parts where the flow velocity is high and parts where it is slow, which in turn causes The upper limit for determining the combustible range in a pot burner was set low, and the lower limit was set high.

This invention was made in view of these conventional drawbacks.

The content of this invention will be explained below based on the embodiment shown in FIG.

Reference numeral B in the figure indicates a conventionally known pot burner, in which the furnace body 11 has an air supply port 11a in the bottom wall and a donut-shaped guide tube 11C having a flame discharge port 1lb in the upper part.
A screw tube 13 is inserted into the bracket 12, which is fixed across the air supply port 11a, and a fuel pan 14 is inserted into the bracket 12.
, and the baked ball 15 are screwed and fixed.

The baked ball 15 has a protrusion 15a formed on its inclined peripheral surface, and forms a fuel flow path 15b between it and the fuel pan 14.

Further, an oil feed pipe 16 is connected to the lower end of the screw tube 13, and fuel oil is supplied onto the fuel pan 14 from the discharge port 13a through the screw tube 13.

Furthermore, a protrusion 11 d is formed downward around the bottom surface of the furnace body 11 to ensure tight engagement with the burner mounting portion C.

This burner mounting part C has a furnace body 1 whose upper end is a pot burner B.
A cylindrical body 21 that engages with the protrusion 11 d of the pot burner B and whose lower end is connected to the blower D, and a plate that is disposed inside the cylindrical body 21 and faces the air supply port 11 a of the upper pot burner B. A part of the cylindrical body 21 has a cutout groove 21 a into which the oil pipe 16 is inserted, and the receiver 22 is provided with an overflow pipe 23 .

Furthermore, an oil-impregnated member 23 (glass fiber, asbestos, etc.) impregnated with fuel oil by capillary action is placed inside the receiving plate 22, and an ignition heater 24 is placed adjacent to this oil-impregnated member 23.

In order to ensure this ignition action, the bottom surface of the receiving plate 22 is shaped to form a low portion 22a and a high portion 22b, and the oil-impregnated member 23 is placed so as to span these two portions.

The receiving plate 22 not only receives fuel oil when it overflows from the pot burner B, but also receives ignition fuel from the oil feed pipe 25 at the time of ignition, and at the same time helps supply primary air to the pot burner B. A portion of the edge is welded to the cylindrical body 21 so as to form a required air flow hole 26 between the cylindrical body 21 and the inner wall thereof.

The blower device D connected to the burner mounting portion C includes a motor 32 fixed to a U-shaped support frame 31 with its output shaft projecting upward, and fixed to an output shaft 32a of the motor 32. It consists of a centrifugal impeller 33 that sucks air from below and blows it in a centrifugal direction, and an inverted truncated cone-shaped partition plate 35 that defines the intake port 34 of this centrifugal impeller 33. At the same time that it is fixed via the mounting base 6, an air passage is formed by the receiving plate 22 and the partition plate 35, and the suction port 3
4, primary air is supplied to the pot burner B via the air circulation hole 26 and the air supply port 11a.

The motor 32 is a variable speed motor, and the amount of primary air is adjusted by controlling its rotational speed.

In the above structure, when operating this pot burner, (a) First, a predetermined amount of ignition fuel oil is supplied from the oil pipe 25 onto the receiving plate 22.

(At the same time, oil is also supplied to the fuel tray 14 from the oil feed pipe 16.

) (a) Next, the ignition heater 24 is energized, and the oil-impregnated member 2
Heat and ignite the surface of step 3.

(b) When ignition is detected (by a sensor not shown), the ignition heater 24 is de-energized, and the flame on the receiving plate 22 preheats the fuel pan 14 and the baked ball 15, and further burns the fuel oil on the fuel pan 14. Also ignites.

(c) Start the motor 32 (by sensor or timer) to supply primary air.

(2) Thereafter, the amount of primary air is adjusted by controlling the rotational speed of the motor 32 of the blower D so as to maintain the required air-fuel ratio with respect to the amount of fuel supplied to the pot burner B.

(e) Fuel oil is supplied from the discharge port 13a of the screw tube 13, heated by the fuel pan 14 and the baked ball 15, and is heated to the fuel flow path 1.
It vaporizes from 5b and blows out into the primary combustion chamber, mixes with the primary air, burns, and then undergoes secondary combustion in the combustion tube 4 via the upper flame outlet 1lb, which allows combustion in burner B. If excessive supply exceeds the range, it will not be completely vaporized and will flow down, reaching the receiving plate 22 and further flowing out through the overflow pipe 23.

The following effects can be obtained from the above-mentioned precepts.

■ The primary air chamber, that is, the lower part of the pot burner B, is surrounded by a cylindrical body 21 and a partition plate 35 having a small diameter suction port 34 in the center, and the air supply port of the furnace body 11 is placed inside the cylinder body 21. 11a is provided, and the blower is installed directly below the catch plate 22, the overall size is reduced, and the overflow oil and radiant heat directed from the pot burner B to the blower are Since it is shut off by the receiving plate 22, it will not be overheated, and thermal damage to it will be prevented.

(2) Since the saucer 22 is spaced apart from the bottom wall of the furnace body 11 and has a smaller diameter than the inner diameter of the cylinder 22, and the suction port 34 is provided by constricting the bottom of the cylinder 21 with the partition plate 35, The outside air sucked in from the suction port 34 flows approximately evenly around the entire circumference of the receiving plate 22 and is then transferred from the air supply port 11a to the furnace body 1.
1, the receiving plate 22 is cooled well to prevent the receiving plate 22 from overheating during overflow, and the vaporized gas and air are mixed well in the furnace body 11, resulting in combustion. It will become stable.

- Since the blower has a variable speed, it is easy to control the rotation speed of the blower according to the amount of fuel supplied, and it is easy to expand the combustion limit of the burner up and down.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing the state of use of a conventional pot burner, and FIG. 2 is a partially sectional front view showing an embodiment of this invention. 1 is a ventilation barrel, 4 is a combustion tube, 6 is a mounting base, B is a pot burner, C is a burner mounting part, D is a blower device, 11 is a furnace body, 1
3 is a screw tube, 14 is a fuel pan, 15 is baked clay, 16 is an oil pipe, 21 is a cylinder, 22 is a receiver, 23 is an oil-impregnated member, 24 is an ignition heater, 26 is an air circulation hole, 31 is a support frame , 32 is a motor, 33 is a centrifugal impeller, 34 is an inlet, and 35 is a partition plate.

Claims (1)

[Scope of utility model registration request] In a pot burner in which a fuel pan and baked clay are placed in a hollow furnace body that has a flame discharge port on the top and an air supply port on the bottom wall, and an oil feed pipe is connected to the fuel pan, the bottom wall of the furnace body A cylindrical body extending downward from the outer periphery, a partition plate that narrows the lower opening of the cylinder to a small diameter to form an air intake port, and a predetermined gap within the cylinder with respect to the air supply port. A plate-shaped receiving plate which is arranged facing each other and has a diameter smaller than the inner diameter of the cylinder, and a variable speed rotor which is arranged directly below the receiving plate and rotates around the vertical center of the cylinder. A forced air pot burner comprising a blower.