JPH0268418A - Hot blast generating device in grain drying machine - Google Patents

Abstract

PURPOSE:To improve the mixing of ambient air with flames that are generated by a burner by the arrangement that part of the ambient air proceeds through a narrow air space section between a burner and the inner wall of a wind tunnel while the remaining part proceeds forwards as it detours in the side air space section of the burner with its speed being reduced. CONSTITUTION:Combustion flames enter a duct 44, while an air stream is gener ated by an air suction fan 9, and the ambient air flow entering from a netted frame section 46 of a wind tunnel 7 passes the outer circumference 6 of a burner section and enters the inside of the duct 44 to merge with said flames and the air flow changes into hot blast. At this time, part of the ambient air flow passes the left side of a burner 6 which has a narrow space while the remaining part passes the right side of the burner 6 which has a wide space. Accordingly there is a difference of flow speed of the introduced ambient air between at the left side and right side of the burner 6 so that a swirl flow is liable to develop in cooperation with the rotation of a vaporization cylinder 23 in the way of the transit to the front face of the burner 6 and the mixing of ambient air with the burner flames is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a hot air generator in a grain dryer.

[Prior art and the problem to be solved by the invention] In a grain dryer, a burner is arranged on one side of a long hot air chamber in the front and back, and a suction fan on the other side creates suction air across the grain flow passage. At the very least, there is a form in which the burner flame and outside air are mixed.The burner is housed in a box-shaped wind barrel through which suction air can pass, and on the 111I side there is a box-shaped wind barrel that allows the burner flame to mix with outside air. Connecting the ducts 1 to 1 to be promoted.

On the other hand, vaporizing burners, which are advantageous for instant ignition and extinguishment, are becoming popular.

By the way, in the past, a burner was disposed in the center of the recorder cylinder, and outside air was passed from behind the burner, bypassing the outer periphery of the burner, and passing almost evenly toward the duct h section in front. It is in the form of

For this reason, the flame burning within the combustion cylinder and the outside air are not sufficiently mixed.

[Means to solve the problem]

This invention attempts to eliminate the drawbacks listed in -1-, and the burner 6 that burns the vaporized fuel jetted forward from the combustion disk 27 is biased toward one side of the left and right sides in the wind cylinder 7 that communicates with the hot air chamber. At a position immediately behind the burner 6 in the wind cylinder 7, an outside air introduction D 46 is opened, and a space that is wide on the side of the burner 6 in the wind 117 is formed as a detour A for the introduced air. Hot air generator for grain dryer;
The structure is as follows.

[Operation and effect of the invention]

A portion of the outside air introduced from immediately behind the burner 6 in the combustion state passes through the narrow space between the burner 6 and the inner wall of the wind cylinder 7 and moves forward, and the rest passes through the side space of the burner 6. Similarly, it moves forward while detouring while the flow speed is weakened. Therefore, in front of the burner 6, outside air with an uneven flow rate is mixed, and a swirling flow is generated due to the influence of the rotating carburetor cylinder, etc.
Good mixing with the flame generated in the burner.

〔Example〕

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

1 is a machine frame of a grain dryer, and inside this machine frame, a storage tank 2, a drying room 3, and a grain collection room 4 are installed vertically, and a grain collection room is installed outside the machine frame 1. A grain lifting machine 5 for lifting and returning the collected grains to a storage tank 2 is installed on one side of the storage tank 4. The drying chamber 3 includes a hot air chamber 8 that passes through a wind cylinder 7 that surrounds the burner 6, and an exhaust chamber 1 that communicates with a fan l1ii1-0 that has a suction fan 9.
-1 with a grain flow passage partitioned with a breathable material. :
L2 is formed, and the grains flowing down by a predetermined amount are sprayed with hot air and dried by constant rotation of the feed valves 13 and ↓3 provided at the lower part of each flow passage 12.12.

The grain lifting machine 5 has a structure in which an I-belt is wound around the inside, and scoops up the dry grain transferred to one side by a lower transfer spiral 14 installed horizontally at the lower part of the grain chamber 4. The structure is such that it can be transferred to The grains scooped up by the grain lifting machine 5 and thrown in part are guided to the starting end side of a transfer gutter 16 provided with a transfer spiral 5. The grains horizontally transferred by the transfer spiral 15 are guided to a rotating diffusion plate 17 disposed in a part of the center 4 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 a rear combustion air intake cylinder 2o, and a burner fan 2 is installed inside.
1 and the motor 22 and vaporizer tube 2 to which the fan 21 is directly connected.
3. A case body 25 that accommodates the drive motor 24, etc., a dish-shaped combustion tube 2G connected to the front of the case body 25, and a combustion tube 23 located at the center of the combustion tube 26, which fits into the combustion tube 26. Combustion disk 2 that spouts vaporized fuel from a large number of spout ports.
Consists of 7th magnitude. For liquid fuel such as kerosene, use the fuel pump 28.
- The configuration is such that the fuel is supplied to the peripheral surface of a diffuser 32 provided on the tip side of the rotating shaft 31 to rotate the vaporizing tube 23 via the fuel valve 29, nozzle 30, etc. 33 is a blower cylinder, 34 is.”
1. This is an ignition heater provided in a bulging portion 26a on a part of the outer circumference of the combustion tube 26.

I- A container-shaped filter case 36 formed with a shallow bottom is provided at the bottom of the substrate 18 so that it can be slid back and forth. A guide body 38 is provided at a position below the combustion tube 26, and is formed into a sloped guide surface 38a with a front end, and is bored at a position corresponding to a U-shaped baffle plate 39 fixed to the rear upper surface of this guide body 38. A detour path is formed from the suction port 40 to the suction port 41 provided in the substrate 18, and a discharge port 43 is provided at a position corresponding to the guide tube 42 provided in the substrate 18. Note that this guide tube 42 connects one end of the combustion air introduction tube 20.

On the other hand, on the ^1f side of the board 18, there is a tough 1 with a rectangular cross section.
~44 are connected. That is, a rectangular cylindrical body formed by the left and right side walls and the -1- lower opposing wall is attached to the left and right bent edges 18b and 18c of the front half of the substrate 18 and the descending slope 18a continuous thereto. They are integrated by welding means.

The burner 6 main body is connected to the substrate 18 to the dug 1-44 shown in this -.
The support leg 19 and the handle-shaped connecting member 4
It is fixedly supported by 5.

- Requirements to enclose the burner 6 (1) The wind cylinder 7 has a rectangular cross section, and its rear surface is slightly biased to one side (left side) to form an outside air inlet 46 that allows ventilation. A mesh frame 47 is attached and is detachably attached to the machine frame 1 using a lower fastener. The plate 18 on the burner 6 is attached to the duct 44 so that the burner 6 portion is located in front of the mesh frame 47, that is, the burner 6 is disposed biased to one side (left side) in the wind cylinder 7. Rear end side lower bent edge 44a, 44. b can be fixed to the machine frame with a fastener. In the space A formed on the right side when viewed from the back side of the burner 6, the above-mentioned delivery valves 13 and 1 are provided.
A circulation clutch lever 48, which can change the speed of the engine 3 to a standard rotational speed or a high rotational speed, is disposed so as to be freely switchable up and down. In addition, the clutch lever 48 is connected to a wire (not shown) that is connected to the clutch lever 48, and the transmission mechanism (not shown) is switched as shown in the manual.
The structure is such that it can be used. 49 is a support frame provided in a box shape to support the clutch lever 48.

The distance between the inner wall 50 of the support frame 49 and the burner 6 is as follows:
It is formed wider than the gap between the left side of the burner 6 and the wind cylinder 7, and is formed as a detour passage for the outside air.

The fuel valve 29 can drop a predetermined amount of fuel through the nozzle 30 onto the periphery of the diffuser 32 while controlling opening and closing in response to a fuel supply signal from a control mechanism section described later, for example, a pulse signal with variable on-time. It is the composition.

A wind pressure sensor 51 detects the presence or absence of introduced outside air.

The grain circulation system consisting of a portion of the grain lifting machine 5, -1 and the lower transfer spirals 14, 15 is rotationally linked by a circulation system motor 52 fixed to the side wall of the second part of the grain lifting machine 5 frame.

The drive shaft of the motor 52 rotates in conjunction with the shaft of the upper transfer spiral 15, and further rotates with this shaft a pulley shaft for winding the bell l- around the hacket 1 of the grain lifting machine 5 through transmission bells 1-53. still,
The lower transfer spiral 14 is operatively connected to a pulley shaft at the lower part of the grain lifting machine 5 via a transmission belt 54.

Further, the delivery valves 13 and 13 are independently rotated by a valve motor (not shown), and the suction fan 9 is independently rotated by a fan motor (not shown).

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.

” - Explain how the example works.

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 the fuel supply amount determined based on the outside temperature condition and manual filling amount setting, that is, the valve on time transmission, and the nozzle 3
The fuel supplied from the zero end drips onto the circumferential surface of the diffuser 32 and moves along the inner circumferential surface of the vaporization tube 26 along with the combustion air blown by the fan 21 while being atomized.

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 at the center of the combustion tube 26 is warmed 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 jet nozzle. After that, it ejects and continues to burn.

The combustion flame enters the ducts I to 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 joins the flame. At the very least, it turns into hot air. At this time, part of the outside air passes through the left side of the burner 6, which has a narrow space, and the other part passes through the right side of the burner 6, which has a wide space. Therefore, the flow velocity of the outside air differs between the left and right sides of the burner 6, and together with the rotation of the vaporizing cylinder 23, a swirling flow is likely to occur during the transition to the front of the burner 6, and the mixing with the burner flame is good. Become.

The hot air is distributed around the hot air chamber 8 and the grain flow passage 12.
12, reaches the exhaust chamber 11, and is discharged outside the machine. In the meantime, the falling grain is dried.

The grains that have passed through the downstream passages 12, 12 are collected in the grain collection chamber 4, subjected to the transfer actions of the lower transfer spiral 14, the grain lifting machine 5, and the upper transfer spiral 15, and returned to the storage tank 2 again. The tank 2
Inside, the grain is slowly cooled and tempered.

The drying process described above is repeated, and when the periodically measured moisture value reaches the initially set stop cl moisture value, the drying process automatically stops (1), the motors of all parts are turned off, and the burner 6 is turned off.
The fuel supply signal to the engine is also cut off and turned off.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side sectional view of the main part, Fig. 2 is a plan view thereof, and Fig. 3 is a line taken along the line A-A of Fig. 1.
4 is a side sectional view of the filter section, FIG. 5 is a side sectional view of the burner, FIG. 6 is a front view thereof, FIG. 7 is an overall front view, and FIG. 8 is a sectional view thereof. In the figure, 1 is the machine frame, 6 is the burner, 7 is the 1st floor, 1114.8 is the hot air chamber, 9 is the suction fan, 11 is the exhaust air chamber, 12° 12 is the grain flow passage, 26 is the combustion tube, and 27 is the combustion chamber. Show the board.

Claims (1)

[Claims] (1) A burner 6 that burns vaporized fuel ejected forward from the combustion disk 27 is provided in the wind barrel 7 communicating with the hot air chamber so as to be biased toward one side of the left and right sides, and the burner 6 in the wind barrel 7 A hot air generating device for a grain dryer in which an outside air inlet 46 is opened at a position immediately behind , and a space that is wide on the sides of the burner 6 in the wind cylinder 7 is formed as a detour A for the introduced air.