JPH064178Y2 - Hot air generator for grain dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hot air generator in a grain dryer.

[Problems to be Solved by Prior Art and Invention] In a grain dryer, when a hot air generator is installed on the inlet side of a drying air intake wind tunnel, there is a drawback in that the front-rear length of the dryer is lengthened. Part or all of the portion is stored in the dryer frame. By the way, due to an abnormality of the suction fan that should introduce drying air into the hot air chamber,
The combustion flame is not properly introduced to the hot air chamber side and rises upward, and there is a possibility that the control box portion in the vicinity may be heated and damaged while flowing backward through the guide outer cylinder. This is even more the case when the cover frame that covers the burner portion outside the side wall of the dryer is short and the effect of blocking the control box portion is small, as in the above embodiment.

[Means for Solving Problems] For this reason, the present invention is directed to a grain dryer for drying the grain flowing from the storage tank 2 by applying hot air to the hot air chamber 7 inlet position where the drying air can be introduced. All or a part of the burner 6 is provided at an insertion position, and the burner 6 has a combustion cylinder 20 having a combustion flame outlet portion a opened forward, and a combustion flame is provided on the outer periphery of the combustion cylinder 20 outlet portion a with hot air. A guide outer cylinder 27 that guides the inner side of the chamber 7 is provided, and the guide outer cylinder 27 has an opening 2 that opens above the combustion cylinder 20 outlet a.
9 is provided in the grain dryer.

[Operation and Effect of the Invention] The combustion flame of the burner 6 is completely combusted from the combustion cylinder 20 through the guide outer cylinder 27 and reaches the inside of the hot air chamber 7 under the effect of the suction fan. When the suction air cannot be properly maintained due to the abnormality of the suction fan or the like, the combustion flame of the burner 6 comes out of the combustion cylinder 20 and rises upward, and the opening provided in the guide outer cylinder 27 further above. It is possible to pass through 29 and remain in the hot air chamber 7 easily, and backflow through the guide outer cylinder 27 is reduced, which is safe and does not cause a damage accident to a control box installed in the vicinity.

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

Reference numeral 1 is a machine frame of a grain dryer, which is formed by stacking an upper storage tank 2, an intermediate drying chamber 3 and a lower grain collecting chamber 4 in an overlapping manner. An elevator 5 is installed upright to lift and return the collected grains to the storage tank 2 on one side. In addition, drying room 3
Has downflow passages 10, 10 formed between a hot air chamber 7 leading to the burner 6 and an exhaust air chamber 9 leading to a suction fan 8. The hot air is blown onto the grains when passing through the downflow passages 10, 10. This is a known structure for drying.

Inside the elevator 5, there is a belt 11 which is wound around upper and lower drive pulleys or driven pulleys, and buckets 12, 12, ... Are arranged on the belt 11 at regular intervals. The buckets 12, 12 ... Scoop the grains transferred to one side by a transfer spiral 13 provided laterally in the lower part of the grain collecting chamber 4, convey them upward, and throw them from the transfer end portion of the forward process. Mouth 14
It is a structure that jumps out. Reference numeral 15 is an upper transfer spiral for horizontally transferring the grains that have been thrown out, 16 is a diffusion plate, 17,
Reference numeral 17 is a delivery valve.

The burner 6 has a so-called pot type, and the combustion dish 1
8, a fuel nozzle 19, a combustion cylinder 20, etc., and is provided at the inlet side of the wind tunnel in which the hot air chamber 7 is to be formed. Of these, the fuel nozzle 19 is looked onto the center of the combustion tray 18, and the fuel supplied from this nozzle 19 is diffused and distributed on the upper surface of the combustion tray 18. Reference numeral 21 is a fin placed on the upper side of the combustion tray 18. Reference numeral 22 denotes a lower tray provided under the combustion tray 18, and an ignition cloth 23 and an ignition coil 2 are provided in the tray.
4, a drain pipe 25 is connected to the lower surface, and the lower tray 22 is provided at the center with the nozzle 19 and the combustion tray 18
And is attached to the fixed plate 26. The combustion cylinder 20 is attached to the upper side of the fixed plate 26 and guides the flame burned on the combustion plate 18. The upper portion is bent horizontally to one side to form an opening.

Reference numeral 27 denotes a guide outer cylinder that surrounds the combustion cylinder 20 portion of the burner 6, and an inclined plate 28 is provided on the inner lower side. The guide outer cylinder 27 and the inclined plate 28 are formed to have a rectangular cross section, and the front end thereof is inclined downward.

Reference numeral 29 is an opening provided in the guide outer cylinder 27 immediately above the flame opening a of the burner 6. This opening 29 is provided to be opened within the machine wall 7 of the dryer.

Reference numeral 30 is a moisture meter provided in the middle of the elevator 5, and 31 is a control box provided with various control mechanisms such as controlling the amount of fuel supplied to the burner 6 based on the measurement result of the moisture meter.

Reference numeral 32 denotes a connection frame provided outside the wall of the dryer so as to surround the back surface of the burner 6, and the back surface of the connection frame 32 is formed of a mesh frame 33 so that outside air can be introduced.

The operation of the above example will be described.

When the grain is put into the tension hopper (not shown), the grain guided on the diffusion plate 16 through the elevator 5 and the upper transfer spiral 15 is diffused and discharged by the rotation of the grain and uniformly drops into the storage tank. .

When the above grain filling process is completed, the grain type, finishing moisture, etc. are set and the drying work is started. By the drying start command from the control unit in the control box 31,
The burner 6 burns and hot air is generated by the suction action of the suction fan 8, and the grains in the storage tank 2 are exposed to the hot air while flowing down the drying chamber 3 and reach the grain collecting chamber 4. Then, the buckets 12, 12 of the elevator 5 are transferred to one side by the lower transfer spiral.
It is fried in and reaches the storage tank 2 again, where it is subjected to tempering for a while.

Such a process is repeated, and when a predetermined moisture value is reached, the drying is completed.

In the burner 6, the fuel flowing out from the fuel nozzle 19 is diffused on the upper surface of the fuel tray 18 and burned, and the burned flame is completely burned from the combustion cylinder 20 through the guide outer cylinder 27 and inside the hot air chamber 7. Leading to. Since the guide outer cylinder 27 is inclined downward, the flame is ejected while changing its direction gradually downward with the externally introduced air, so that the flame opening a position of the combustion cylinder 20 of the burner 6 is set to the upper position. Even when the temperature is set, unevenness in the temperature distribution above and below the hot air chamber 7 rarely occurs.

When the motor that rotates the dryer parts is stopped, or when the amount of air passing through the hot air chamber 7 stops or becomes extremely small due to a suction fan abnormality, the combustion flame of the burner 6 exits from the flame opening a and rises upward. Through the opening 29 of the rising guide outer cylinder 27 to reach the open space at the inlet of the hot air chamber 7.

Therefore, the flame caused by the afterburning of the burner 6 immediately after the stop of the drying operation and the burner 6 burning flame when the suction fan is abnormal are less likely to flow back to the inlet side through the guide outer cylinder 27, and the hot air directly contacts the control box 31. It is not damaged and is safe.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an overall front view, FIG. 2 is a sectional view of the same, and FIG.
FIG. 4 is a plan view thereof. 1 is a grain dryer frame, 2 is a storage tank, 3 is a drying chamber,
6 is a burner, 7 is a hot air chamber, 8 is a suction fan, 18 is a combustion dish, 20 is a combustion tube, 22 is a lower tray, 27 is a guide outer tube,
Reference numeral 29 indicates an opening, and 31 indicates a control box.

Claims (1)

[Scope of utility model registration request] 1. A grain dryer that dries hot air to a grain flowing down from a storage tank 2 by placing all or part of a burner 6 at an inlet position of a hot air chamber 7 into which drying air can be introduced. The burner 6 has a combustion cylinder 20 in which the combustion flame outlet portion a is opened forward.
A guide outer cylinder 27 for guiding the combustion flame to the inner side of the hot air chamber 7 is provided on the outer circumference of the outlet a, and an opening 29 is formed in the guide outer cylinder 27 above the combustion cylinder 20 outlet a. Hot air generator for grain dryer.