JPH0539430Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is useful for exterminating various types of mites that live on tatami mats,
The present invention relates to a heating dryer for tatami mats that is intended to sterilize bacteria such as various types of mold and to prevent their generation.

<Conventional technology> In recent years, with the spread of aluminum sash in houses, which has improved airtightness, and the development of heating equipment, the humidity and temperature inside houses have become a favorable environment for the growth of dust mites and mold, making it difficult to use indoor mats throughout the year. Similarly, a large amount of dust mites, mold, etc. occur on the front and back of tatami mats and the core material, which is one of the causes of various diseases and symptoms, such as pain and itching, and various allergic diseases, especially atopic dermatitis and childhood asthma. It has become an environmental health problem.

Methods for exterminating mites that have appeared on tatami mats include injection or application of carbamate-based or organophosphorus-based insecticides, spray insecticides, and fuming treatments, but these methods are effective. It has the disadvantage that it is difficult to reach the core of the tatami mat, and the use of strong insecticides is harmful to hygiene. As another effective extermination method that does not rely on these types of chemicals, heating and drying treatment of tatami mats is attracting attention because mites are sensitive to dryness and heat and die when exposed to heat of about 50℃ or higher.
For this reason, heating dryers for tatami mats have recently been developed, and some of them are commercially available for practical use.

<Problems to be solved by the invention> Hot air is used as a heating source for tatami mats in conventional tatami heating dryers.Although some electric heating systems are used as the hot air generation mechanism, the main method is the combustion of kerosene-burning burners. Because it relies on the so-called open fire method that uses gas directly, the combustion gas contains not only soot but also a considerable amount of moisture and odor, which adsorbs to the tatami mats to be dried and contaminates them. There was a drawback. Furthermore, this hot air generation mechanism, which has a considerable volume, is installed approximately in the center on the floor of the drying oven, so when the drying oven is mounted on a truck, etc.
The storage position of the tatami in the furnace is inevitably high, which not only makes it inconvenient to take the tatami in and out, but also causes uneven distribution of hot air inside the furnace, causing the temperature inside the furnace to vary locally, causing heating of the tatami. This causes warpage, distortion, and deformation due to unevenness. In addition, the support for vertically supporting the tatami mats in the furnace is composed of a single bar-shaped support member extending horizontally, so that adjacent tatami mats may not come into contact with each other, or the spacing between the tatami mats may be uneven. However, the distribution of the hot air flowing between them lacks uniformity, which promotes uneven heating of the tatami, making it difficult to dry the tatami uniformly, which has the serious drawback of increasing distortion and deformation of the tatami. Furthermore, due to the uneven temperature distribution in the furnace, the drying time of the tatami mats has to be extended, which inevitably leads to a decrease in the efficiency of the tatami drying process and increases fuel consumption.

<Means for solving the problem> For this reason, the present invention consists of a box-shaped drying oven body with an opening/closing door on the front, and a duct for indirect heating of the air inside the oven installed in a duct along the rear wall of the oven body. Between the heat exchanger, the blower for circulating air in the furnace installed at the opening of the duct, and the inner surface of the upper wall of the furnace body and the upper surface of the floor wall, Upper and lower air circulation spaces that communicate with each other and form a part of the circulation path of the hot air generated by the heat exchanger are arranged at appropriate intervals in the oven width direction between the two air circulation spaces. In order to accommodate and support the tatami mats to be dried in an upright manner, the section has an inverted U-shape and is substantially continuous in a serpentine shape, and has a large number of holes with different opening area ratios in the vertical direction. Means for solving the above-mentioned problems is provided by a configuration comprising a row of perforated plates arranged with a perforated plate, and an exhaust damper provided on the wall of the furnace main body to discharge part of the hot air from the inside of the furnace in a timely manner. And so.

<Operation> The hot air generation mechanism according to the present invention uses a burner fueled by petroleum such as kerosene or light oil as a heat source, and introduces the combustion gas into the pipe of the heat exchanger, thereby indirectly controlling the air in the furnace that is in contact with the outer surface of the pipe. Since it uses a so-called indirect heating method, which heats the product directly, it is clean and free from soot, moisture, and odor from oil combustion gas. The generated heated air is blown into the furnace by a blower and supplied for drying the tatami mats, and then sucked back into the blower and sent to the heat exchanger. At this time, the hot air circulation path first passes through the air circulation space on the ceiling side of the oven, which communicates with the upper opening of the duct along the rear wall of the drying oven, and then between the rows of perforated plates that house and hold the tatami mats upright. As it descends, it flows through the many holes that are open on the entire surface of the perforated plate and collides with the entire surface of the tatami mat, forming a vertical airflow that effectively heats the tatami. The air flows from the open end to the lower opening of the duct via the air circulation space formed between the upper surface of the hearth, is sucked into the blower at the end of the duct, is reheated by the heat exchanger, and moves inside the furnace along the route described above. circulate. Needless to say, the distribution of hot air flowing through the furnace is required to be uniform, but in this invention, the hot air is distributed vertically inside the furnace using perforated plates placed at regular intervals inside the furnace. It functions as a distributor or rectifying plate that distributes the hot air evenly within the furnace, and the number of holes opened in the perforated plate is set so that the number of holes in the vertical direction becomes denser in the lower part and sparser in the upper part. By making the tatami mats different in size and by varying the diameter of each hole, consideration has been given to the distribution of the hot air to prevent uneven heating of the tatami surface due to the circulating hot air. Furthermore, this perforated plate itself is heated by hot air, and the radiant heat it possesses also heats the tatami mats stored therein, so that heat is effectively used and the efficiency of drying the tatami mats is increased. This inverted U-shaped perforated board is configured so that the distance between the boards near the bend at the top is roughly equivalent to the thickness of a tatami mat, and the distance between the boards gradually widens toward the bottom. Therefore, the inserted tatami mat is held between the perforated plates at its upper edge, so it is held in an almost upright position without being greatly tilted or curved, and the space between the tatami mat and the perforated plates is The gap also forms a space that widens toward the end, and has the effect of not imparting harmful flow resistance to the hot air flowing therebetween. Of course, there is no possibility that the inserted tatami mats will come into contact with each other and block the flow of hot air. It is heated and dried evenly. Furthermore, according to the configuration of the present invention, the furnace air heating mechanism is attached to the rear wall of the drying furnace, and only a narrow air circulation space is left on the hearth surface. The rows can be installed relatively low inside the oven, making it extremely easy to insert and pull out tatami mats between the perforated plates, and when the drying oven is mounted on a truck, etc., the above-mentioned operational convenience is achieved. is doubled. The temperature inside the drying oven of this invention is automatically controlled and maintained at 90°C to 100°C to dry and dehumidify the tatami. As the tatami mats are dried and dehumidified, the hot air circulating in the furnace gradually becomes humidified, so the exhaust damper is opened manually or automatically at appropriate times to exhaust a portion of the hot air and replace it with fresh air, replenishing the air inside the furnace. Dehumidify.

<Example> An example of the present invention will be described based on the accompanying drawings.

In the figure, reference numeral 1 denotes a drying oven main body with a door 2 pivotally attached to the front thereof, which can be opened and closed, and the outer shape of the drying oven is a rectangular parallelepiped box, and the outer wall is covered with a heat insulating material. 3 is a duct installed vertically along the rear wall inside the drying oven main body 1, and its upper opening communicates with the upper air circulation space 4 of the drying oven main body 1, and the lower opening of the duct communicates with the upper air circulation space 4 of the drying oven main body 1. It communicates with the lower air circulation space 5 of. Reference numeral 6 denotes a combustion chamber disposed in the lower part of the duct 3, and a kerosene burner 7 is attached to the side surface. Reference numeral 8 designates heat exchange pipes installed in a staggered manner on the upper surface of the combustion chamber 6, and open into a smoke chamber 10 whose wall is the inclined portion 9 of the duct 3.
Incidentally, this inclined portion 9 is heated by the hot gas in the smoke chamber, and acts as a heating straightening plate for the air in the furnace. 11
A smoke pipe is provided in a smoke chamber 10, and an exhaust fan 12 is installed at the end of the smoke pipe. Above kerosene burner 7
The combustion chamber 6 and the heat exchange pipe constitute a heat exchanger for indirect heating of the air in the furnace, and a blower (Shirotskov fan) arranged below the heat exchanger for feeding the air in the furnace to the duct 3. Together with 13, it constitutes an in-furnace air heating circulation mechanism. A plurality of supports 14 are installed in the oven width direction above the hearth leaving the lower air circulation space 5 in the drying oven body 1, and are arranged in plurality in the oven depth direction. Reference numeral 15 is a perforated plate having an inverted U-shaped cross section, the lower end of which is connected to an adjacent perforated plate to form a substantially meandering shape, and is placed and fixed on the supporter 14 over the entire width of the furnace. . The upper end of this perforated plate row forms the upper air circulation space 4 with the upper wall of the furnace main body, and the rear end extends close to the wall surface of the duct 3. The tatami mats to be dried are accommodated one by one in the space between the plates of the row of perforated plates 15, and supported on the supporter 14 in an upright manner. A large number of holes F opened in the perforated plate 15 in this embodiment
The board was divided into three sections in the vertical direction, and the opening area ratio was set at a ratio of 1:3:6 from top to bottom, respectively, but it was not necessarily limited to three sections, and the opening area ratio was set in multiple stages. It may be increased gradually or steplessly. The key is to adjust the number of holes so that the heating by hot air is even across the front surface of the tatami.
It is important to consider the hole diameter and placement. 16
1 is a filter provided on the air suction side of the blower 13, and 17 is an exhaust tamper for dehumidification provided on the upper wall of the drying oven body 1. Now, when operating the dryer configured as described above, after opening the opening/closing door 2 and inserting the tatami mats to be dried into the space inside the perforated plate array 15 in the furnace, the door is sealed and the kerosene oil is removed. The burner 7 is ignited and the blower 13 is started. High-temperature combustion gas from the kerosene burner 7 rises from the combustion chamber 6 through each heat exchange pipe, enters the smoke chamber 10, and is discharged to the outside by an exhaust fan 12 in the smoke pipe 11. On the other hand, duct 3
The air inside is heated through the heated heat exchange pipe and the inclined part 9 of the duct forming part of the smoke chamber, enters the upper air circulation space 4 of the furnace body 1 by the blower 13, and then passes through the porous The flow is rectified downward by the plate row 15, and is evenly divided into the perforated plate 15.
It passes through hole F and heats the built-in tatami. The hot air that has passed through the perforated plate array passes through the lower air circulation space 5, removes dust with the filter 16, is sucked into the blower 13, is heated again by the indirect heating heat exchanger,
The above-mentioned circulation path allows for circulation within the furnace. Therefore, the direction of flow of hot air inside the drying oven body that actually performs the drying action is only a high-temperature downward flow, and thus consists of a high-temperature upward flow and a low-temperature downward flow within the oven body in a conventional dryer. Compared to drying methods that use convection-like reflux with a large temperature difference, it is possible to expect much more uniform and rapid heating and drying over the entire surface of the tatami.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various design changes can be made.

<Effects of the invention> In short, according to the invention, the air for heating and drying tatami mats is heated by an indirect heating method, so that the tatami mats are heated by the adsorption of soot, moisture, and odor from oil combustion gas, as in the direct heating method. No contamination occurs.

2 The temperature distribution inside the drying oven body is controlled by rectification of perforated plates, etc.
Since the distribution effect is uniform, there is no uneven drying of the tatami mat, and there is no warping of the tatami mat, or any deformation or distortion of the vinyl lining, edges, etc., caused by conventional machines.

3 By installing a hot air rectifier and smoke chamber that utilizes part of the duct, the thermal efficiency is high and the drying capacity has been significantly improved, so the drying time for tatami mats has been reduced by almost half compared to conventional machines. .

4. With improved thermal efficiency, fuel consumption decreased and drying costs decreased.

5. The insertion position of tatami mats into the drying oven is now lower than that of conventional machines, making it extremely easy to insert and remove tatami mats when operating the on-vehicle drying oven.

It has such outstanding effects that it is extremely beneficial for this type of industry.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a tatami heating dryer according to an embodiment of the present invention with the ceiling removed, Fig. 2 is a sectional view taken along the arrow A-A in Fig. 1, and Fig. 3 is the same in the arrow direction. B-
It is a sectional view along B. DESCRIPTION OF SYMBOLS 1... Drying oven body, 2... Opening/closing door, 3... Duct, 4... Upper air circulation space, 5... Lower air circulation space, 6... Combustion chamber, 7... Kerosene burner, 8...
...heat exchange pipe, 9...slanted part of duct, 10...
...Smoke chamber, 11...Smoke pipe, 12...Exhaust fan, 1
3... Blower (Shirotskov fan), 14... Supporter, 15... Perforated plate, 16... Filter, 1
7... Exhaust fan, F... Hole cut in the perforated plate.

Claims (1)

[Scope of utility model registration request] A box-shaped drying oven body with an opening/closing door on the front, a heat exchanger for indirect heating of the air in the oven installed in a duct along the rear wall of the oven body, and a heat exchanger for indirect heating of the air inside the oven installed in one opening of the duct. A circulation path for hot air generated by the heat exchanger that communicates with each of the upper and lower openings of the duct between a blower for air circulation and the inner surface of the upper wall of the furnace body and the upper surface of the floor wall, respectively. Upper and lower air circulation spaces forming a part of the oven are arranged at appropriate intervals in the oven width direction between the two air circulation spaces, and the tatami mats to be dried are accommodated and supported in an upright manner. a perforated plate array having an inverted U-shaped cross section and substantially continuous in a meandering manner and having a large number of holes arranged with different opening area ratios in the vertical direction, and provided on the wall surface of the furnace main body,
A tatami heating dryer comprising an exhaust damper capable of timely exhausting a portion of the hot air.