JPS6218227Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a hot air supply device for a tea dryer.

Tea processing and drying machines generally have several layers of ventilation conveyors arranged in a drying chamber, and the tea leaves are sequentially dropped from the upper conveyor to the lower conveyor and dried by supplying hot air. However, in the past, the hot air supplied to each conveyor had approximately the same temperature.

In other words, the hot air was simply distributed through a duct extending from the hot air generator to the hot air ports opened between the conveyors, thereby supplying the hot air without any temperature difference at all.

By the way, the drying process is the final process in the production of rough tea, and the significance of this is to dry the tea leaves, which have a residual moisture content of 10 to 13% after the rolling process, to 3 to 4%, giving them a firm shape and enhancing their flavor. Although it has
As mentioned above, conventional dryers supply hot air at the same temperature from the beginning to the end of drying, so at the beginning of drying, high-temperature hot air is suddenly blown onto the tea leaves, which are still moist at the beginning of drying, resulting in less water evaporation. It becomes active from the time it is put into the drying room. This is because the degree of dryness on the surface and inside of the tea leaves is extremely different.
This creates a temperature difference, which inevitably deforms the shape of the tea leaves, causing them to become dry and stuffy.
The shape will not be firm and the flavor will not be enhanced, making it impossible to fully demonstrate the significance of the drying process.

By the way, in order to bring out the flavor in the tea leaves, it is necessary to temporarily increase drying by supplying low-temperature hot air to the tea leaves in the upper tier, and then supplying high-temperature hot air to the lower tier, that is, before the end of drying. .

To do this, it would be easy to add a dedicated burner, but since the work is important to the aroma, it is not possible to simply supply the combustion gas, so we decided to add another heat exchanger. It is uneconomical to equip one.

In view of these circumstances, the present invention is designed to provide hot air supplied to each conveyor with a temperature difference between the upper and lower stages, giving the shape of the tea leaves a tighter shape, enhancing the flavor, and improving the quality of the product tea leaves. This is an improvement on the idea already filed as Utility Model Application No. 143130/1983, with further consideration given to transportability and ease of assembly.

Next, the present invention will be described with reference to illustrated embodiments.

Reference numeral 1 denotes a drying chamber having a substantially rectangular space, and a hood 2 is provided above the drying chamber, and an opening of the hood is connected to an exhaust fan 3 to guide the exhaust air inside the chamber 1 upward to the outside of the machine. 4
is connected to a blower device 6 via a chute 5 at a tea leaf outlet provided at the lower side of one side of the drying chamber. In the drying room 1, ventilation conveyors 7, 7, 7, 7 are stacked at appropriate intervals, and a sweeping tool 9 is attached on the room floor 8 to collect spilled leaves into a chute 5. The conveyor group has a large number of air permeable plates laid out in a caterpillar shape, and only the front end is pivoted so that it can freely hang down just before the sprocket at the end in the direction of travel, as shown in the figure. 10 is a finely crushed leaf feeder with a chute 11 facing the starting end of the top conveyor; 1
2 is a drive mechanism such as a conveyor.

On the other hand, on the other side wall 13 of the drying chamber, hot air ports 14, 15, 1 are oriented at respective intervals of the respective conveyors.
6 are opened, and these constitute the tea manufacturing/drying machine main body 17.

The hot air generator 18 consists of a heat exchange section and a forced fan. The heat exchange section includes a furnace tube 23 and combustion flame paths 24, 24 connected to the furnace tube 23, which are arranged in a casing 22 placed on a machine frame 21, and a burner 25 is attached to the furnace tube 23. , the hot air generated in the furnace tube 23 by the burner 25 is transferred to the casing 22.
The combustion flame is exhausted from the chimney 26 through combustion flame paths 24, 24 arranged in a maze-like manner.

An air supply port 27 is bored in the lower surface of the casing 22,
The outlet 27 is connected to the outlet of the hot air forcing fan 19 .

Reference numeral 20 denotes a cold air push fan installed on the outer duct 31 of the double duct 30 and communicated with the outer duct 31.

Reference numeral 32 denotes an extension duct which communicates between a hot air outlet opening on the top surface of the casing 22 and one side of an inner duct 33 of the double duct 30 .

The double duct 30 has a square-shaped two-layer structure in which the inner wall of the outer circumferential duct 31 and the outer wall of the inner circumferential duct 33 are common, and a part of the common wall 34 on the way from one side to the other side is cut out. 35 and the outer peripheral duct 31
The other side has branches 3 corresponding to the hot air ports 15 and 16.
6, 37, and the other side of the inner circumferential duct 33 is connected to the hot air outlet 14 at the lowest stage of the hot air outlet, and branches 36, 3
The other side of the outer peripheral duct 31 is connected to the hot air ports 15 and 16 at the upper stage thereof.

28, 29 are dampers that adjust the amount of air discharged from each of the push-in fans 19, 20, and 38, 38, 38 are jammer plates that promote mixing of hot air and cold air.

Therefore, when the conveyor 7 is started and the finely rolled leaves from the previous process are fed from the feeder 10, the tea leaves travel on the going surface of the conveyor, and eventually fall onto the going surface of the conveyor and are transferred. Then, it passes through the lower conveyor, and then the lower conveyor, and is eventually taken out of the chute 5.

On the other hand, when the air forced into the casing 22 from the air supply port 27 by the pushing fan 19 passes through the inside of the casing 22, the air enters the furnace cylinder 22, which is heated to a high temperature.
The hot air contacts the surfaces of the combustion flame paths 24, 24, exchanges heat, and becomes hot air, which is guided to the inner circumferential duct 33 via the extension duct 32.

On the other hand, the air at room temperature sucked by the cold air fan 20 is guided directly to the outer duct 31.

The hot air guided to the inner circumferential duct 33 flows through the common wall 3
A portion of the air is introduced into the outer circumferential duct 31 through the opening 35 of No. 4, and is mixed with the cold air guided into the outer circumferential duct 31 by the jammer plate 38 to become relatively low-temperature hot air, which is then passed through the hot air ports 15 and 16. It is supplied into the drying chamber 1.

On the other hand, the remaining hot air in the inner circumferential duct 33 is supplied into the drying chamber 1 as hot air through the hot air port 14 at the lowest stage without being mixed with the cold air.

Therefore, relatively low-temperature hot air can be supplied to the drying chamber 1 from the upper conveyor, and hot air can be supplied from the lower conveyor to the drying chamber 1. It is possible to supply hot air with different air volume and temperature difference.

The present invention is capable of supplying hot air with different temperatures using a single hot air generator, and the configuration for this purpose is to change the duct of the conventional hot air generator to a double duct equipped with a forced fan for cold air. All it takes is a simple change, and it can be installed without changing the specifications or size of the main unit. Therefore, the duct etc. are less likely to be damaged during transportation, and assembly on site is also extremely easy.

In addition, the forced cold air fan ensures mixing of hot air and cold air, making it possible to supply hot air with a stable temperature difference over a wide range.

Furthermore, by supplying different types of hot air separately, a relatively large amount of low-temperature hot air can be supplied to the tea leaves in the upper row, that is, tea leaves that still have a high moisture content, without causing stuffiness. Since the inside of the leaf is gradually and evenly dried and hot air at the highest temperature is supplied at the final stage of drying when the moisture content reaches 5 to 6%, the aroma can be sufficiently enhanced.

According to the present invention, although the structure is relatively simple, it is possible to fully utilize the significance of the tea manufacturing and drying process and obtain rough tea with excellent finished quality and storage quality.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the state of use, FIG. 2 is a partially cutaway front view of the main part, and FIG. 3 is a side view of the main part. 4...Tea leaf outlet, 7...Breathable conveyor, 1
3...Other side wall, 14, 15, 16...Hot air port, 1
7...Tea drying machine main body, 19...Pushing fan for hot air, 20...Pushing fan for cold air, 21...Machine frame,
22... Casing, 23... Furnace tube, 24... Combustion flame path, 27... Air supply port, 30... Double duct,
31...Outer duct, 33...Inner duct, 34
... Common wall, 35 ... Opening, 36, 37 ... Branch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of ventilation conveyors 7 are supported by shafts, a tea leaf outlet 4 is formed at the lower side of one side, and a plurality of hot air outlets are formed on the other side wall 13 between each conveyor. 14,15,
It is a device for supplying hot air to a tea manufacturing dryer 17 with an opening 16, and a casing 22 placed on a machine frame 21 houses a furnace tube 23 and combustion flame paths 24, 24 connected thereto. Air supply port 27
The hot air push-in fan 19 is communicated with the upper hot air outlet and the inner duct 3 of the double duct 30.
The outer duct 31 of the double duct 30 is equipped with a forced fan 20 for cold air, and the fan 20 is communicated with the outer duct 31. A tea manufacturing/drying machine characterized in that the inner duct 33 is connected to the hot air ports 15 and 16 at the lower stage, and the common wall 34 in the middle of the double duct 30 is partially opened 35. hot air supply equipment. (2) The hot air of the tea manufacturing and drying machine according to claim (1) of the utility model registration, characterized in that the peripheral duct 31 is branched 36, 37 and connected to a plurality of hot air ports 15, 16 in the upper stage. Feeding device.