JPH01181012A - Hot air producing device - Google Patents

Abstract

PURPOSE:To continue stable burning by providing a duct at which the confluence of air flow and burner flame is made, setting the inlet of the duct near a combustion cylinder, and providing an air intake for combustion for introducing part of the air flow in the neighborhood of a duct inlet part. CONSTITUTION:A duct 44, namely hot air produced in the inlet side of a hot air chamber 8 is distributed before and after the hot air chamber 8, reaches an exhaust air chamber 11 through grain flow-down passages 12, 12 to exhaust out of a device, and the flow-down grains are dried therebetween. Outside air speed of the rear part of a burner 6 to the hot air chamber 8 is slightly increased at a burner part, and rapidly increased at the intake part of the duct 44 of the front of a combustion cylinder 26. The outside air speed is suddenly reduced in front of a prescribed distance as it is gradually decreased in the duct 44. Since an air intake 40 for combustion is arranged at the position where the speed is increased, an introducing air quantity from the air intake 40 is reduced in the burner 6 as a drying air quantity is increased, the dry air is balanced with the introducing air, and good stable combustion can be continued even if the drying air quantity is changed by the coarse and fine change of the flow-down grains, the rotating speed modification and the like.

Description

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

[Highlights to be solved by the prior art and the invention] Conventionally, for example, in a vaporizing burner installed in a grain dryer, the burner is placed on one side of a long hot air chamber in the front and back, and the grain flow passage is placed in the other side. This is a form in which the burner flame and outside air are mixed by generating suction air from a side suction fan.

By the way, this burner requires air for combustion, so a part of the above-mentioned outside air is introduced, and separate burner fans are provided to change the rotation speed to accommodate changes in the amount of combustion. . . However, if there is a change in the outside air that is introduced, the amount of air introduced may unexpectedly change, resulting in so-called lift combustion or red-flame combustion.

[Means for resolving the shortcomings]

In order to eliminate the above-mentioned drawbacks, the present invention is provided with a vaporization tube 23 that receives combustion air and vaporizes the liquid fuel flowing inside, and a combustion tube 26 that burns the vaporized fuel jetted from the combustion disk 27. A duct 44 is provided in front of the burner 6 to increase the flow velocity of the air flow from the back or side of the burner 6 and merge the air flow with the burner flame, and the combustion tube is brought close to the inlet of the duct 44. With the help of
The hot air generator has a configuration in which a combustion air intake port 40 for introducing a part of this air flow is provided near the entrance of the duct 44.

[Operation and effect of the invention]

The outside air flow velocity from the back of burner 6 to the duct is:
It increases rapidly at the duct entrance in front of the combustion tube 26, and gradually decreases inside the duct. Burner combustion air inlet 40
is installed at a position where the above-mentioned flow velocity is increased and a portion of the introduced outside air is taken in, so the drying air volume may fluctuate due to changes in the density of the falling grain or changes in the rotation speed of the suction fan. However, as the amount of air introduced from the suction port 40 increases, the amount of air flowing into the burner 6 decreases as the amount of drying air increases, so that the amount of air flowing into the burner 6 is balanced with the drying air and has the effect of stably continuing combustion.

〔Example〕

An embodiment of this invention will be described based on the drawings.

Reference numeral 1 designates a frame of a grain dryer. Inside this machine frame, a storage tank 2, a drying chamber 3, and a grain collection chamber 4 are installed vertically from the top, and a part of the grain collection chamber 4 is installed outside the machine frame 1. Storage tank 2 for grain collected on the side
A grain lifting machine 5 is installed to raise and return the grain. In addition, the drying room 3 is
Hot air chamber 8 and suction fan 9 leading to air volume 7 surrounding burner 6
A grain flow passage 12.12 partitioned by a breathable material is formed between the grain flow passage 12.12 and the exhaust chamber 11 leading to the fan body 10 having
．． The structure is such that hot air is blown onto the grains flowing down at predetermined intervals by constant rotation of the rotor 13 to dry them.

The grain lifting machine 5 has a structure in which a packet belt is wound therein, and is configured to be able to scoop up dry grains transferred to one side by a lower transfer spiral 14 installed horizontally at the lower part of the grain collection chamber 4 and transfer them to the upper part. . The grains scooped up by the grain lifting machine 5 and thrown at the upper part are guided to the starting end side of a transfer trough 16 provided with an upper transfer spiral 15. The grains horizontally transferred by the transfer spiral 15 are guided to a rotating diffusion plate 17 disposed at the upper center of the storage tank 2, and are dispersed and dropped into the storage tank 2. .

The burner 6 is attached to a support leg 1 on a base plate 18 fixed to the machine frame.
It is installed in a horizontal position through
and the motor 22 and vaporizer tube 23 to which the fan 21 is directly connected.
A case body 25 that accommodates the drive motor 24 and the like, a dish-shaped combustion tube 26 connected to the front of the case body 25, and the vaporization tube 23 located at the center of the combustion tube 26, which fits into the combustion tube 26. Combustion disk 27 that spouts vaporized fuel from a large number of spout ports.
Consists of etc. In addition, for liquid fuel such as kerosene, please use the fuel pump 28.
The fuel is supplied through the fuel valve 29, nozzle 30, etc. to the circumferential surface of a diffuser 32 provided at the tip end of the rotating shaft 31 to be rotated by the vaporizing tube 23. Reference numeral 33 denotes a blower tube, and 34 denotes an ignition heater provided in a bulged portion 26a on a part of the outer periphery of the combustion tube 26.

A container-shaped filter case 36 formed with a shallow bottom is provided at the bottom of the base plate 18 so that it can be slid back and forth. A guide body 38 formed on the front convex inclined guide surface 38a is provided at the lower position, and an inlet 40 is bored at a corresponding position to a U-shaped baffle plate 39 fixed to the rear upper surface of this guide body 38. A detour passage is formed from the inlet port 41 to the inlet port 41 provided in the base plate 18, and an outlet port 43 is provided at a position corresponding to the guide tube 42 provided in the base plate 18. Note that this guide cylinder 42 is connected to the combustion air introduction cylinder 2.
This is to connect one end of 0.

On the other hand, a duct 44 having a rectangular entrance cross section is connected to the front side of the board 18. That is, a rectangular cylindrical body formed by left and right side walls and upper and lower opposing walls whose opposing distances become narrower toward the front.
The front half of the substrate 18 and the descending slope section 18a continuous thereto,
It is integrated with the left and right bent edges 18b and 18c by welding means.

The main body of the burner 6 is fixedly supported with respect to the base plate 18 to the duct 44 by the support legs 19 and the upper handle-like connecting member 45. At this time, the leading edge of the combustion tube 26 of the burner 6 is arranged to coincide with or approach the imaginary entrance plane of the duct 44. or.

- The above-mentioned suction port 4 is bored at a corresponding position of the U-shaped baffle plate 39.
0 is disposed directly below the combustion tube 26 and intersects with the imaginary entrance plane of the duct 44.

The wind cylinder 7 that should enclose the burner 6 has a mesh frame 46 on its rear surface biased to one side to allow ventilation, and is detachably attached to the machine frame 1 using upper and lower fasteners. It is. The burner 6 base plate 18 is configured such that the upper and lower bent edges 44a and 44b on the rear end side of the duct 44 can be fixed to the machine frame with a fastener so that the burner 6 portion is located in front of the mesh frame 46. It is. In this way, the outside air is introduced through the mesh frame 46, which has a relatively large opening area, bypasses the outer periphery of the burner 6, and moves toward the duct 44, which has a narrow opening area, and its flow speed increases at the entrance of the duct 44. It is the composition.

The fuel valve 29 is configured to be able to drip a predetermined amount of fuel onto the circumferential portion of the diffuser 32 through the nozzle 30 while controlling opening and closing in response to a fuel supply signal from a control mechanism unit described later, for example, a pulse signal with variable on-time. be.

A wind pressure sensor 47 detects the presence of outside air, and a temperature sensor 48 is placed above the opening of the upper wall of the duct 44 to detect an abnormal state of the flame or an abnormal rise in the temperature of the hot air chamber 8. I can do it.

The grain circulation system consisting of the grain lifting machine 5 and the upper and lower transfer spirals 14 and 15 is rotated in conjunction with a circulation system motor 50 fixed to the upper side wall of the grain lifting machine 5 frame.

The drive shaft of the motor 5o is rotationally interlocked with the shaft of the upper transfer spiral 15, and is further interlocked with the rotation of this shaft with a bobbin shaft around which the packet belt of the grain lifting machine 5 is wound by means of a transmission belt 51. In addition, the lower transfer spiral 14 is connected to a pulley shaft at the lower part of the grain lifting machine 5 with a transmission belt 52.
are interlocked and connected via.

Further, the delivery valves 13, 13 are independently rotated by a valve motor 53, and the suction fan 9 is independently rotated by a fan motor 54.

55 is a flexible discharge pipe that communicates with the transfer start end side opening of the transfer gutter 16 via an opening/closing shutter (not shown); 56;
is a stake hopper.

FIG. 9 shows another embodiment of the duct, in which openings 57.57 are formed in the left and right side walls of the duct 44, and guide members 58.5 are provided inside these side walls to guide a portion of the hot air toward the openings.
8 is provided to prevent abnormal heating of the vaporizing cylinder 23.

The action of the upper side will be explained.

After loading a predetermined amount of grain into the storage tank 2 and setting the loading amount setting switch and stop moisture setting switch (not shown) to the specified settings, turning on the drying switch turns on the rotating parts and the burner 6.
works. Here, the burner 6 burns in response to a fuel supply amount determined based on outside temperature conditions and the setting of the above-mentioned charging amount, that is, a valve on time signal.
The fuel supplied from the zero end drips onto the peripheral surface of the diffuser 32, is atomized and blown by the fan 21, and a portion of the outside air flows through the suction ports 40, 41, the filter 37, the air introduction cylinder 20, etc. The combustion air moves along the inner circumferential surface of the vaporization cylinder 26 as the combustion air is taken in. The ignited fuel is ejected from an outlet (not shown) to the front surface of the combustion plate 27, and is ignited by the ignition heater 34 to be combusted. - Once the combustion state occurs, the outer periphery of the vaporizer tube 23 of the combustion tube 26 is heated by the flame, and the atomized fuel that is subsequently supplied is vaporized (gasified), and this vaporized fuel is ejected from the rear surface of the combustion disk 27 through the injection port. After that, it is ejected and combustion continues.

The combustion flame enters the duct 44, while the outside air generated by the suction fan 9 and entering from the mesh frame 46 of the wind barrel 7 passes through the outer periphery of the burner 6, enters the duct 44, and merges the flames. It turns into hot air. At this time, the ventilation area is narrowed at the inlet of the duct 44, that is, near the front edge of the burner combustion tube 26, and the outside air flow velocity is increased. Even if this occurs, the generation of vortices will be delayed, and this combustion tube 2
It is possible to suppress the generation of eddy currents immediately in front of 6. Of course, the combustion tube 26
The inclined guide surface 38a of the guide body 38 gradually lifts and transfers the outside air, so even if the front surface of the combustion tube 26 suddenly opens and attempts to spread the flames, the flames will not spread. In particular, the lower side portion is lifted upward to heat the vaporizing cylinder 23. Therefore, the heating effect of the vaporizer tube 23 is improved without disturbing the combustion flame.

The hot air generated at the duct 44 section, that is, the hot air chamber 8 inlet side, is
The grains are distributed before and after the hot air chamber 8, pass through the grain flow passage 12°12, reach the exhaust chamber 11, and are discharged outside the machine.

In the meantime, the falling grain is dried.

Grain passing through the downstream passage 12.12 is collected in the grain collection chamber 4 and transferred to the lower transfer spiral 14. The grains are transferred back to the storage tank 2 by the transfer action of the grain lifting machine 5 and the upper transfer spiral 15. The tank 2
Inside, the grain is slowly cooled and tempered.

The drying process described above is repeated, and when the regularly measured moisture value reaches the initially set stop moisture value, the drying operation is automatically stopped, the motors of each part 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 increases slightly at the burner 6 section and rapidly increases at the duct 44 entrance section in front of the combustion tube 26, as shown in Fig. 1. . Inside the duct 44, it gradually decreases and rapidly decreases after a predetermined distance.

Since the combustion air intake port 40 in this embodiment is arranged at a position where the above-mentioned flow velocity increases, the drying air volume does not fluctuate due to changes in the density of the falling grain, changes in the rotation speed of the suction fan 9, etc. However, as the amount of air introduced from the suction port 4° increases, the amount of air flowing into the burner 6 decreases as the amount of drying air increases, so that the amount of air flowing into the burner 6 is balanced with the amount of drying air, and stable combustion can be continued.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a side sectional view of the main part, Fig. 2 is an enlarged sectional view of a part thereof, Fig. 3 is a perspective view of the main part, and Fig. 4 is a side sectional view of the main part. Its plan view, Fig. 5 is a side sectional view of the burner, Fig. 6 is its front view, Fig. 7 is its overall front view, Fig. 8 is its sectional view, and Fig. 9 is a side showing another embodiment of the duct. FIG. In the figure, 1 is the machine frame, 6 is the burner, 7 is the wind barrel, 8 is the hot air chamber,
9 is a suction fan, 11 is an exhaust chamber, 12° 12 is a grain flow passage, 23 is a vaporization tube, 26 is a combustion tube, 27 is a combustion tube, ff
i, 40 indicates an inlet, and 44 indicates a duct. Figure 1 Figure 4 Figure 5 Figure B Figure 6 Page 7 Figure 8 Figure 1.39

Claims (1)

[Claims] On the front side of the burner 6, a vaporizer cylinder 23 that receives combustion air and vaporizes the liquid fuel flowing therein, and a combustion cylinder 26 that burns the vaporized fuel ejected from the combustion disk 27 are installed.
A duct 44 is provided to increase the flow velocity of the air flow from the back or side of the burner 6 and merge the air flow with the burner flame, and the combustion tube is brought close to the inlet of the duct 44, and the duct 44 A hot air generator provided with a combustion air inlet 40 near the inlet to introduce a part of this air flow.