JP2503564B2 - Hot air generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot air generator, which can be used in a grain dryer or the like.

[Problems to be Solved by Prior Art and Invention] For example, in a vaporization burner installed in a conventional grain dryer, a burner is arranged on one side of a hot air chamber that is long in the front and rear to sandwich the grain flow passage on the other side. This is a form in which the suction air from the suction fan is raised to mix the burner flame with the outside air.

By the way, this burner needs combustion air,
It is assumed that a part of the outside air is introduced, and the respective burner fans are provided so that the number of rotations can be changed to cope with the change in the combustion amount. . However, when the introduced outside air wind fluctuates, the amount of introduced air may unexpectedly fluctuate due to the influence of so-called lift combustion or a red-fire combustion state.

[Means for solving problems]

In order to solve the above-mentioned drawbacks, the present invention eliminates the above-mentioned drawbacks by vaporizing a cylinder 23 that receives combustion air and vaporizes the liquid fuel that internally circulates, and a combustion cylinder 26 that burns the vaporized fuel that is ejected from a combustion disc 27.
Is provided on the front side of the burner 6 in which the air flow from the back side or the side of the burner 6 is increased, and a duct 44 for joining the air flow and the burner flame is provided. Is close to the inlet of the duct 44, and a combustion air suction port 40 for introducing a part of the air flow into the burner 6 is provided near the inlet of the duct 44.

[Operation and effect of the invention]

The flow velocity of outside air from the rear of the burner 6 to the duct rapidly increases at the duct inlet on the front of the combustion cylinder 26 and gradually decreases in the duct. Burner combustion air inlet 40
Is disposed at the position where the flow velocity is increased, and a part of the outside air introduced is taken and sent to the burner 6 side. Therefore, the amount of dry air changes depending on the density of the falling grain and the rotation of the suction fan. Even if the amount of air introduced from the suction port 40 changes, the amount of air flowing into the burner 6 decreases as the amount of dry air increases, and the amount of air introduced from the suction port 40 is balanced with the amount of dry air to continue combustion in a stable manner. effective.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

1 is a machine frame of a grain dryer, in which a storage tank 2, a drying chamber 3 and a grain collecting chamber 4 are vertically installed from the upper part, and one of the grain collecting chamber 4 is provided outside the machine frame 1. A grain lifting machine 5 for lifting and returning the grain collected on the side to the storage tank 2 is erected. In addition, drying room 3
Is a grain flow-down passage 12, 12 partitioned by a ventilation material between a hot air chamber 8 communicating with a wind tunnel 7 surrounding the burner 6 and an exhaust air chamber 11 communicating with a fan shell 10 having a suction fan 9. By the constant rotation of the feeding valves 13 and 13 provided in the lower portions of the flow-down passages 12 and 12, the grain flowing down by a predetermined amount is exposed to hot air to be dried.

The fried machine 5 has a structure in which a bucket belt is wound inside, and is configured to be able to transfer the dried grain transferred to one side by a lower transfer spiral 14 laid laterally to the lower part of the grain collection chamber 4 to the scooping upper part. . Grains scooped by the fried machine 5 and thrown at the upper part are guided to the starting end side of a transfer gutter 16 provided with an upper transfer spiral 15. The grain horizontally transferred by the transfer spiral 15 is guided to a rotary diffusion plate 17 arranged in the upper center of the storage tank 2 and diffused and dropped into the storage tank 2.

The burner 6 is provided with a support leg 19 on a substrate 18 fixed to the machine frame.
Is installed in a horizontal position via a burner fan 21 and a motor 22 for directly connecting the fan 21 and a vaporizer cylinder 23 drive motor inside the burner air introduction cylinder 20.
A case body 25 that accommodates 24 and the like, a dish-shaped combustion cylinder 26 connected to the front surface of the case body 25, the vaporization cylinder 23 located in the center of the combustion cylinder 26, and a large number of jets fitted to the combustion cylinder 26. It is composed of a combustion plate 27 or the like that ejects vaporized fuel from the outlet. Liquid fuel such as kerosene is supplied to the peripheral surface of the diffuser 32, which is provided on the tip side of the rotary shaft 31 that rotates the vaporization cylinder 23, through the fuel pump 28, the fuel valve 29, the nozzle 30, and the like. 33 is a blower tube, 34
Is an ignition heater provided on a bulging portion 26a of a part of the outer periphery of the combustion cylinder 26.

At the bottom of the substrate 18, a container-like filter case 36 formed in a shallow bottom is provided so as to be slidable back and forth, and a filter 37 is arranged in an inclined posture in the case 36, and a combustion cylinder 26 of the substrate 18 is provided. In the lower position, the front sloped guide surface
A guide body 38 formed in 38a is provided, and a bypass passage extends from an intake port 40 formed at a corresponding position of a U-shaped air guide plate 36 fixed to the rear upper surface of the guide body 38 to an intake port 41 formed in the substrate 18. Further, a discharge port 43 is formed at a position corresponding to the guide cylinder 42 provided on the substrate 18. The guide cylinder 42 connects one end of the combustion air introducing cylinder 20.

On the other hand, a duct 44 having a rectangular inlet cross section is connected to the front side of the substrate 18. That is, the rectangular tubular body formed by the left and right side wall portions and the upper and lower opposed wall portions that have a narrower facing distance toward the front is formed by the bent edges on the left and right sides of the front half of the substrate 18 and the descending inclined portion 18a continuous to the front half. The parts 18b and 18c are integrated by welding means.

The main body of the burner 6 is fixedly supported on the base plate 18 to the duct 44 by the support leg portion 19 and the upper handle-like connecting member 45. At this time, the front edge of the burner 6 combustion tube 26 is arranged so as to be coincident with or close to the virtual plane of the inlet of the duct 44. Further, the suction port 40 formed at a corresponding position of the U-shaped baffle plate 36 is arranged just below the combustion tube 26 so as to intersect with an imaginary inlet surface of the duct 44.

The wind tunnel 7 that should surround the burner 6 has a mesh frame 46 that is biased to one side and allows ventilation to be formed on the rear surface thereof, and is detachably attached to the machine frame 1 with upper and lower fasteners. There is. The burner 6 base plate 18 has a rear end side vertical bending curve 44a, which is arranged so that the burner 6 portion is located on the front side of the net frame 46.
44b can be fixed to the machine frame with fasteners. In this way, the outside air wind is introduced from the net frame 46 having a relatively large opening area, bypasses the outer peripheral portion of the burner 6 and moves toward the duct 44 having a narrowed opening area, and the flow velocity thereof becomes faster at the inlet of the duct 44. It is a composition.

The fuel valve 29 receives a fuel supply signal from a control mechanism section described later, for example, an on-time variable pulse signal, and controls opening / closing to supply a predetermined amount of fuel to the diffuser through a nozzle 30.
It is a structure that can be dropped on 32 laps.

Reference numeral 47 is a wind pressure sensor for detecting the presence or absence of the introduced outside air, and 48 is a temperature sensor looking above the opening of the upper wall of the duct 44 to detect an abnormal state of flame or an abnormal rise in temperature of the hot air chamber 8. sell.

The grain circulation system including the grain elevator 5 and the upper and lower transfer spirals 14 and 15 is rotationally interlocked by a circulation system motor 50 fixed to the upper side wall of the frame of the grain elevator 5. The drive shaft of the motor 50 rotationally interlocks with the shaft of the upper transfer helix 15, and the transmission belt 51 rotationally interlocks with this shaft and the pulley shaft around which the bucket belt of the grain elevator 5 is wound. The lower transfer spiral 14 is interlockingly connected to the pulley shaft at the bottom of the grain elevator 5 via a transmission belt 52.

Further, the delivery valves 13 and 13 are rotationally and independently driven by a valve motor 53 and the suction fan 9 by a fan motor 54, respectively.

Reference numeral 55 is a flexible discharge pipe that communicates with the opening of the transfer gutter 16 on the transfer start end side through an opening / closing shutter (not shown), and 56 is a tension hopper.

FIG. 9 shows another embodiment of the duct. Openings 57, 57 are formed in the left and right side walls of the duct 44, and guide members 58, 58 for guiding a part of the hot air toward the openings are formed inside the side walls. It is provided to prevent abnormal heating of the vaporization cylinder 23.

 The operation of the above example will be described.

When a predetermined amount of grain is poured into the storage tank 2 and the dry amount switch and the stop moisture setting switch (not shown) are set to predetermined values, the drying switch is turned on.
Works. Here, the burner 6 burns in response to a fuel supply amount determined based on the outside air temperature condition and the setting of the above-mentioned amount of expansion, that is, a valve on-time signal and burns.
The fuel supplied from the end is dropped on the peripheral surface of the diffuser 32, is atomized and is blown by the fan 21, and part of the outside air is sucked into the suction port 4.
The air moves along the inner peripheral surface of the vaporization cylinder 26 along with the combustion air taken in through the 0, 41, the filter 37, the air introduction cylinder 20 and the like. The ignition fuel is jetted from the outlet (not shown) to the front surface of the combustion board 27, and is burned by the ignition action of the ignition heater 34. Once the combustion state occurs, the outer periphery of the vaporization cylinder 23 at the center of the combustion cylinder 26 is warmed by the flame and vaporizes (gasifies) the atomized fuel that is continuously supplied, and this vaporized fuel passes from the rear surface of the combustion plate 27 through the ejection port. It ejects and continues burning.

The combustion flame enters the duct 44, and on the other hand, the outside air breeze generated by the suction fan 9 and entering from the mesh frame 46 of the wind tunnel 7 passes through the outer periphery of the burner 6 and enters the duct 44 to combine the flames. It turns into hot air. At this time, the duct 44 entrance,
That is, in the vicinity of the front edge of the burner combustion cylinder 26, the ventilation area is narrowed and the outside air flow velocity is accelerated, so that even after the burner 6 has passed the outer peripheral portion, it suddenly becomes open in the front surface of the combustion cylinder 26.
The generation of the vortex is delayed, and the generation of the vortex on the front surface of the combustion cylinder 26 can be suppressed. However, the guide is located below the combustion tube 26.
Since the inclined guide surface 38a of 38 allows the introduced outside air wind to gradually rise and shift, even if an attempt is made to rapidly open the front surface of the combustion tube 26 to diffuse the flame, especially the lower side portion of the flame is The vaporizing cylinder 23 is heated by being lifted up. Therefore, the heating effect of the vaporizing cylinder 23 is improved without disturbing the combustion flame.

The hot air generated at the duct 44 part, that is, the hot air chamber 8 inlet side,
Exhaust chamber 1 distributed before and after hot air chamber 8 and through grain flow passages 12,12
It reaches 1 and is discharged outside the machine. In the meantime, the fallen grain is dried.

Grains that have passed through the flow-down passages 12 and 12 are collected in the grain collection chamber 4 and are returned to the storage tank 2 again under the respective transfer actions of the lower transfer spiral 14, the fried machine 5, and the upper transfer spiral 15. Grains are gradually cooled in the tank 2.

By repeating the above drying process, the drying work is automatically stopped when the periodically measured moisture value reaches the first set stop moisture value, the motors of all parts are turned off, and the fuel supply signal to the burner 6 is also cut off. Turn off.

The flow velocity of outside air (dry air) from the back of the burner 6 to the hot air chamber 8 slightly increases at the burner 6 and rapidly increases at the inlet of the duct 44 in front of the combustion cylinder 26 as shown in FIG. . It gradually decreases in the duct 44, and then rapidly decreases a predetermined distance ahead. Combustion air inlet 40 in this embodiment
Is disposed at the position where the flow velocity is increased, so that even if the dry air volume changes due to the variation of the density of the falling grain, the rotation speed of the suction fan 9 or the like, the introduction from the suction port 40 The amount of air is such that the amount of air flowing through the burner 6 decreases as the amount of dry air increases, and the amount of air is balanced with the dry air so that combustion can continue stably.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side sectional view of an essential part, FIG. 2 is an enlarged sectional view of a part thereof, FIG. 3 is a perspective view of the essential part, and FIG. A plan view, FIG. 5 is a sectional side view of the burner, FIG. 6 is a front view thereof, FIG. 7 is an overall front view, FIG. 8 is a sectional view thereof, and FIG. 9 is a side showing another embodiment of the duct. FIG. In the figure, 1 is a machine frame, 6 is a burner, 7 is a wind tunnel, 8 is a hot air chamber,
9 is a suction fan, 11 is an exhaust chamber, 12 and 12 are grain flow passages, 2
3 is a vaporization cylinder, 26 is a combustion cylinder, 27 is a combustion plate, 40 is an inlet, 44
Indicates a duct.

Claims (1)

(57) [Claims] 1. A burner 6 provided with a vaporization cylinder 23 for receiving combustion air to vaporize a liquid fuel that internally circulates, and a combustion cylinder 26 for burning the vaporized fuel ejected from a combustion disc 27, in front of the burner 6. A duct 44 is provided for converging the flow rate of the air flow from the rear or the side of the burner 6 while increasing the flow rate of the air flow and the burner flame. 44 A hot air generating device provided with a combustion air suction port 40 for introducing a part of this air flow into the burner 6 near the inlet portion.