JP2002089925A - Air curtain device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new air curtain device which can provide such a pressure distribution that can almost evenly blow out high-pressure air over a wide width. SOLUTION: This air curtain device has a double structure composed of an outer cylindrical body 12 having a high-pressure air introducing end section 12A at one end and a closed section 12B at the other end and an inner cylindrical body 14 which is arranged in the body 12 and has opened both ends. The outer cylindrical body 12 has a series of blowing nozzles 16 intermittently or continuously formed along one side face and the inner cylindrical body 14 has a series of orifices 18 intermittently formed along one side face. The blowing nozzles 16 of the outer cylindrical body 12 and the orifices 18 of the inner cylindrical body 14 are positioned in such a cross relationship that the air discharged from the orifices 18 is blown out from the blowing nozzles 16 after flowing along the internal surface of the outer cylindrical body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air curtain device, and more particularly, to a paint operation such as a paint operation, a solvent application operation such as a rust preventive agent or a release agent, in which paint, a solvent, a treating agent, etc. More specifically, the present invention relates to an air curtain device used for directly blowing off dust and water as a water knife (air knife) for cleaning instruments and the like and for a wet-type washer to separate them so as not to be scattered.

[Prior art]

[0002] For example, in the field of cleaning, an air curtain is sprayed on a glass substrate to blow off water droplets on the glass substrate. In this case, in order to perform uniform cleaning, the pressure distribution of the air blown out from the air curtain device is extremely important.

There are various types of such air curtain devices, but the conventional air curtain devices 1a are:
For example, as shown in FIG. 9, a plurality of high-pressure air blowing openings, ie, nozzles 3a are formed at a certain interval on one side surface of a cylindrical body 2a having one end closed, and an open end of the cylindrical body 2a is formed. High-pressure air is introduced into the portion 4a, and air 5a is blown out from the blow-out nozzle opening 3a.

However, in the air curtain device 1a having such a configuration, as is apparent from the pressure distribution curve 6a in FIG. 9, the air curtain device 1a is close to the introduction portion of the high pressure air to the cylindrical body 2a, that is, close to the open end 4a. The amount of air blown from the nozzle opening 3a side is large, while the amount of air blown from the nozzle decreases as approaching the closed end. As a result, the amount of air blown at both ends of the cylindrical body 2a varies greatly. Had occurred.

For this reason, it is difficult to obtain a uniform cleaning effect. Attempts to narrow the spacing of the nozzle openings 3a and increase the size of the nozzle openings as they approach the closed end have increased the manufacturing cost and increased the amount of air used. The desired result of providing a uniform pressure distribution could not be obtained. As a result, it has been found that the practical length range of the air curtain device 1a having the structure shown in FIG. 9 is limited to at most about 1000 mm.

Further, an air curtain device 1b as shown in FIG. 10 is also known. This air curtain device 1b
A plurality of blow-out opening nozzles 3b are formed at regular intervals on one side surface of the cylindrical body 2b whose both ends 4b, 4b are open to each other, and high-pressure air is introduced from both ends 4b, 4b of the cylindrical body 2b. High-pressure air 5 from opening 3b
b.

However, in the air curtain device 1b having such a configuration, as apparent from the pressure distribution curve 6b in FIG. 10, the pressure loss in which the high-pressure air cancels each other near the middle portion of the cylindrical body 2b. It was found that the amount of air blown from the nozzle openings 3b provided in the vicinity thereof decreased, while the amount of air blown from the nozzle openings provided in the vicinity of both ends increased.

As a result, the amount of air blowout at both ends and the intermediate portion varies, and it has not been possible to provide a desirable function of providing a substantially uniform amount of air blown from the nozzles in all regions. Attempts to narrow the spacing between the nozzle openings 3b and increase the size of the nozzle openings as they approach the middle part have been attempted, but the processing is complicated and a uniform distribution is provided only by increasing the amount of air used. Did not achieve the desired results.

As a result, the practical length range of the air curtain device 1b having the structure as shown in FIG. 10 can be increased by about 20 to 30% as compared with the embodiment of FIG. Has been significantly increased, and the handling accompanying the introduction of air from both ends of the cylindrical body 2b is inconvenient. In practice, it has been found that the diameter is approximately 1000 mm.

Furthermore, an air curtain device 1c as shown in FIG. 11 is also known. This device 1c has an end-closed cylinder or outer cylinder 2c having a series of nozzle openings 3c on one side, a diameter smaller than the diameter of the cylinder 2c, and the same on one side. And an inner pipe 7c having a series of orifices 8c.

Here, the inner pipe is inserted into the inside of the cylindrical body 2c until the end of the inner pipe 7c abuts on the closed end thereof, and the row of orifices 8c of the inner pipe is inserted into the nozzle of the cylindrical body. The device has a double pipe structure arranged so as to face in a direction opposite to the row of the openings 3c. High-pressure air is introduced from the open end of the inner inner pipe 7c, and high-pressure air is discharged from the orifice 8c of the inner pipe 7c into the outer cylindrical body 2c.
It blows out c.

In this method, the diameter and pitch of the orifice 8c provided in the inner pipe 7c are changed to reduce the variation in the amount of air blown from the outer pipe 2c. However, also in the air curtain device 1c of such a form, as is clear from the pressure distribution curve 6c shown in FIG. 11, the high-pressure air introduced into the inner pipe 7c is close to both ends of the outer pipe 2c near the center. It has been found that the air blowing amount is larger than that.

As a result, variations in the amount of air blown between the both end portions and the intermediate portion occurred in the same manner as in the apparatus 1b shown in FIG. 10, and a desired function could not be provided. Attempts to narrow the spacing between the nozzle openings 3c and increase the dimensions of the nozzle openings as they approach the intermediate portion have been attempted.
Higher air usage alone did not provide the desired results to provide a uniform distribution. As a result, the practical length range of the air curtain device 1c having the structure as shown in FIG. 11 can be extended up to about 1300 mm, but the inner and outer pipes must be kept at a constant interval, and the production cost is increased. Was found to be higher.

Further, an air curtain device 1d as shown in FIG. 12 is also known. This device 1d is an improvement of the device shown in FIG. 11, and is an air curtain device 1d having a double pipe structure in which the inner pipe of FIG. 11 is inserted into the device of FIG. That is, according to this apparatus 1d, the cylindrical body 2 which is an outer pipe is used to eliminate the drawback of the apparatus shown in FIG.
d is closed, and high-pressure air is introduced from both ends of the inner pipe 7d disposed inside the cylindrical body 2d,
It discharges through the orifice 8d and then through the nozzle opening 3d provided in the cylindrical body 2d.

According to this device, the pressure curve 6d shown in FIG.
As is clear from FIG. 11, the pressure decrease in the middle part of the device as developed in the pressure curve 6c shown in FIG. 11 is greatly improved. As a result, the practical range of the air curtain device 1d having the structure as shown in FIG.
It has been found that it can be extended to about 0 mm.

However, if it is to be used for the surface treatment of long rollers, for example in widths of 4000 to 5000 mm, as in feed machinery, the pressure curve 6
d drops rapidly in the middle, and is still insufficient for use on long rollers. In addition, in the device having such a configuration, the pressure loss in the pipe due to the introduction of high-pressure air from both sides of the inner pipe 7d is large, which increases the manufacturing cost of the device, and is difficult to handle. However, the loss of high-pressure air flowing out between the inner pipe and the cylindrical body is large, and economic efficiency is lacking.

[0017]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems. That is, an object of the present invention is to provide a novel air curtain device capable of providing a pressure distribution for blowing out high-pressure air almost uniformly over a wide width as much as possible.

It is still another object of the present invention to provide an air curtain device which is easy to handle, has a simple structure, is inexpensive in manufacturing cost, and can easily perform maintenance work such as cleaning and repair. Further, the present invention provides an air curtain device in which the pressure loss of the introduced high-pressure air can be reduced as much as possible and the high-pressure air can be effectively used. As a result, the blower used can be reduced in size and the operating cost can be reduced. That is.

[0019]

Means for Solving the Problems Thus, the present inventor has:
As a result of intensive research on such a background of the problem, surprisingly, it was found that the pressure curve was more equalized by arranging the inner cylinder body open at both ends in the outer cylinder body. Based on the above, the present invention has been completed.

That is, the present invention provides (1) an outer cylindrical body having one end serving as a high-pressure air introduction end and the other end serving as a closed part, and an inner cylindrical body disposed therein and having both ends opened. And, an air curtain device having a double structure comprising, wherein the outer cylinder has a series of blowing nozzles formed intermittently or continuously along one side surface,
The inner cylinder body is in an air curtain device having a series of orifices formed intermittently along one side surface.

(2) The position of the blow-out nozzle of the outer cylinder and the position of the orifice of the inner cylinder are determined after the air discharged from the orifice of the inner cylinder moves along the inner wall surface of the outer cylinder. In the air curtain device, the air curtain device is disposed at a relative position where the air curtain is blown from the blow nozzle of the outer cylinder.

(3) An air curtain device in which the high-pressure air introduction end is detachable from the outer cylinder body.

(4) An air curtain device in which the inner cylinder has a circular cross section and the outer cylinder has a rectangular cross section.

(5) The air curtain device includes a fin in which the inner cylinder slides into the corner of the outer cylinder.

Also, (6) a series of orifices provided in the inner cylinder extends from the midpoint of the inner cylinder toward both sides in a region extending over about の of the entire length of the inner cylinder. Exist along the air curtain device.

(7) In the air introduced from the high-pressure air introduction end, 2/3 of the air amount is
The remainder is introduced between the inner cylinder and the outer cylinder, half of the air introduced into the inner cylinder is released into the outer cylinder through the orifice, and the other half is the other cylinder. The air released from the end into the outer cylinder, the air released from the inner cylinder into the outer cylinder, and the air directly introduced into the outer cylinder are released together from the blowing nozzle of the outer cylinder. The air curtain device.

(8) An outer cylindrical body 12 having a rectangular cross-sectional shape in which one end is a removable high-pressure air introduction end 12A and the other end is a closed part 12B, and is disposed inside and open at both ends. An air curtain device 10 having a double structure comprising an inner cylinder body 14 having a circular cross-sectional shape, wherein the inner cylinder body 14 has fins 24 which are slidably fitted into corners of the outer cylinder body 12. The outer cylindrical body 12 has a series of blow-off nozzles 16 formed intermittently from one end to the other end along one side surface, and the inner cylindrical body 14 is located near the center along one side surface. And a series of orifices 18 formed intermittently at the outlet nozzle position of the outer cylinder 12 and the orifice position of the inner cylinder 14 are discharged from the orifice 18 of the inner cylinder 14. Air is outer cylinder 12
After being moved along the inner wall surface of the outer cylinder, they are arranged at mutual positions where the air is blown out from the blowing nozzle 16 of the outer cylinder.
3 is introduced, the rest is introduced between the inner cylinder 14 and the outer cylinder 12, and half of the air introduced into the inner cylinder 14 is discharged into the outer cylinder 12 via the orifice 18. And
The other half is discharged from the other end of the inner cylinder 14 into the outer cylinder 12, and the air discharged from the inner cylinder 14 into the outer cylinder 12 and the air directly introduced into the outer cylinder 12. The air is discharged from the blow-out nozzle 16 of the outer cylinder 12 together with the air that is generated.

[0028]

Embodiments of the present invention will be described below. 1 and 2 are general views showing the configuration and effects of the present invention. In particular, FIG. 1 is a schematic diagram showing the structure and operation of the air curtain device 10 according to the present invention, and FIG. 2 is a diagram explaining the flow amount of high-pressure air introduced.

[0029] As shown in FIG.
In general, one end has a blower device outside the system (FIG. 5).
Has a high-pressure air introduction end portion 12A for introducing high-pressure air supplied from the inside thereof into the inside, and the other end has a closing portion 12B.
And an inner cylindrical body 14 disposed inside the outer cylindrical body 12 and open at both ends for introducing high-pressure air similarly supplied from outside the system to the inside. Have a double structure. In the illustrated embodiment, the length of the outer cylinder 12 is L1, and the length of the inner cylinder 14 is L2 (where L1> L2). Both of these cylinders are desirably formed of a material that can withstand chemicals and the like, for example, a material such as stainless steel.

In the illustrated embodiment, the outer cylinder 12 has a substantially rectangular cross-sectional shape, and a series of blowing nozzles 16 extend from one end to the other end along one corner of the rectangular shape. Up to almost the entire length (from one end to the other end)
Is formed. Although such a blowing nozzle 16 is shown here as being formed intermittently and independently, it may be formed continuously and formed into a slit as described later. it can.

On the other hand, the inner cylindrical body 14 has a substantially cylindrical cross-sectional shape, and as shown in FIGS.
A series of orifices 18 is provided on one side near the center in the longitudinal direction.
Are formed intermittently over a certain area. Here, the area where the series of orifices 18 is formed in the inner cylinder body 14 is near the center in the longitudinal direction, and the size is Δ (1
/ 2) × L2}. In other words, the orifices 18 are not formed in the {(1/4) × L2} portions at both ends of the inner cylindrical body 14, but {(1
It is preferable to form the orifice 18 only on the length of (/ 4) × L2}.

Here, after the air released from the orifice 18 of the inner cylinder 14 moves along the inner wall surface of the outer cylinder 12, the outer cylinder 12 and the inner cylinder 14 It should be noted that the nozzles 16 are arranged in an interrelated position as blown out. Desirably, as shown in FIG. 3, the orifice 18 of the inner cylinder 14 is
The two blow-out nozzles 16 are arranged so as to face directions opposite to each other.

Further, in the present invention, as shown better in FIG. 2, one end of the outer cylinder 12 is a high-pressure air introduction end 12A having a generally funnel shape. The high-pressure air introduction end 12A is detachably (removably attachable) to the outer cylinder body, and is attached in a sealed state via sealing means (not shown) when attached.

Here, the cross-sectional area obtained by subtracting the circular cross-sectional area of the inner cylinder 14 from the circular cross-sectional area of the inner cylinder 14 and the rectangular cross-sectional area of the outer cylinder 12 provides a cross-sectional area satisfying the following conditions. It is preferable from the viewpoint of the efficiency of the air flow to be formed. That is, when the amount of high-pressure air introduced from the high-pressure air introduction end 12A is (V), the amount V1 introduced into the inner cylinder 14 is {(2/3) × V}, and the outer cylinder The amount V2 introduced between the body 12 and the inner cylinder 14 is ｛(1 /
3) The cross-sectional shapes of the inner cylinder and the outer cylinder are formed so as to satisfy × V ×. ｛(2/3) × introduced into the inner cylinder 14
Thereafter, the high pressure air amount (V1) of V｝ is obtained from a plurality of orifices 18 arranged at the center of the inner cylinder body by ｛(１ ／) ×
The amount (V3) of V｝ and the amount (V4) of {(１ ／) × V} from the end of the inner cylinder 14 are respectively equal to the outer cylinder 1
2.

Next, the high-pressure air is blown out from the blow-out nozzles 16 formed in the outer cylinder 12 respectively. As a result, the total blowing amount (V
5) is substantially the same as the amount (V) of the high-pressure air introduced from the high-pressure air introduction end 12A, and the air is discharged from the nozzle 16 in a uniform blow-out state. The high-pressure air blown out of the present device is, as shown by the pressure curve 22 in FIG.
An air curtain having a substantially uniform high-pressure air blowing amount over the entire length can be provided.

FIG. 4 is an overall perspective view of the air curtain device 10 according to the present invention. As is clear from this figure,
Cylindrical inner cylinder 14 arranged inside rectangular outer cylinder 12
At both ends, short positioning fins 24 are fixed around the inner cylindrical body 14 at intervals of about 90 degrees (however, fins on the near side of the inner cylindrical body are omitted). As clearly shown in FIG. 6 (described later), these fins 24 are adapted to fit into respective corners of the rectangular outer cylinder 12. For this reason, when incorporating the inner cylinder 14 into the outer cylinder 12, the inner cylinder 14 is pushed into the outer cylinder 12, and the inner cylinder 4 is moved with the fins 24 fitted into the corners of the outer cylinder. Just slide it. In addition, due to such a structure, the outer cylinder 12 and the inner cylinder 14 can be easily disassembled and assembled, and cleaning and repairing and other maintenance work can be easily performed.

Although FIG. 4 shows an example in which the outer cylinder body and the high-pressure air introduction end 12A can be connected via the connection flange 26, the connection between them is limited to this. Instead, it is of course possible to use couplings or other known sealing connection means. Although not shown in FIG. 4, the stopper is fixed in advance to a predetermined position of a rectangular corner near the closed end of the rectangular outer cylinder 12 so that the inner cylinder 14 with respect to the outer cylinder 12 can be fixed.
Positioning becomes easier.

FIGS. 5 and 6 are views showing an example of a use state of the air curtain device 10 according to the present invention.
Shows the entire system, and FIG. 6 shows a partial cross section thereof. In the system as a whole, 41 is an air supply pipe, 42 is an air volume adjusting valve, 43 is an inverter control panel, 44 is a turbo buoy, and 45 is an air filter. Although not shown,
A check valve is provided so as not to impose an extreme burden on the turbo blower.

The air curtain device 10 is used, for example, to drain water from a glass substrate as shown in the figure. In this case, the air curtain device 10 is disposed at a position separated from the glass substrate 34 by a predetermined distance, and high-pressure air is blown against the glass substrate 34 from this position.
In such an arrangement state, the water curtain W blown from the air curtain device 10 blows off the water droplet W on the glass substrate. Since the air blowing amount is constant with respect to the glass substrate 34 and the pressure distribution of the air is uniform, the drainage on the glass substrate is also performed uniformly, so that it can reliably function as a so-called air knife. .

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific examples of the air curtain device 10 actually manufactured by the present applicant based on the present invention will be described with numerical values. The length (L1) of the rectangular outer cylinder 12 is set to 5
500 mm, the effective length (d1) of one side of the rectangular outer cylinder is 57
mm, the blowing nozzle 16 provided on the rectangular outer cylinder is 10 m
As a rectangular shape of mx 0.6 mm, a total of 156 blowing nozzles were arranged at a pitch of 25 mm.

On the other hand, the length (L2) of the inner cylinder 14 is set to 545
0 mm, the inner diameter (d2) of the circular inner cylinder 12 is 48.8 m
The orifices 18 were circular holes having a diameter of 7 mm, and 48 orifices were arranged at a pitch of 50 mm within a range of 2725 mm in the middle of the inner cylinder 12.
Further, 12 fins 24 for positioning the inner cylindrical body 14 with respect to the outer cylindrical body 12 are formed of a material having a thickness of 3 mm and a width of 10 mm, and these fins 24 are arranged around the inner cylindrical body at intervals of 90 degrees. The three pieces were arranged at a shifted pitch so as not to affect the air flow.

In such an air curtain device, Hitachi 0
Using a 60E2 blower, the static pressure value of the air blowing amount at each position shown in FIG. 2 was measured. Table 1 shows the average value.
Shown in The air discharge length at this time was 1200 mm on average. As a result, although the static pressure value was slightly higher in the vicinity of the entrance than in the other parts, it was found that an air curtain device with extremely good overall variation could be provided in use.

[0043]

[Table 1]

This static pressure tendency is due to the fact that the length of the outer cylinder is about 1
If it is within 0 meters, the diameter of the orifice of the inner cylinder, the mounting position and the pitch can be arbitrarily designed to make the variation of the air blowing amount between both ends and the center part approximately ± 5%. It was found from experiments.

Although the present invention has been described above, the present invention is not limited to the embodiments and the examples, and various modifications can be made as long as the objects are met. 7 and 8 show the outer cylinder 1
9 shows a modification of the second embodiment, and is a front view and a plan view, respectively. The blowing nozzle 16 of the outer cylinder 12 here
Are continuously formed along one side face, and are in a so-called slit shape. Therefore, the blown air is also continuous.

In the present invention, the positioning fins 24
Are arranged on four surfaces at an angle of 90 degrees around the inner cylinder 14, but it is naturally possible to provide them only in the vertical direction or only in the horizontal direction in FIG. Also, it can be installed only at any one of the three surface directions. Further, in the present invention, the outer cylindrical body and the inner cylindrical body are not limited to the rectangular cross-sectional cylindrical body and the circular cross-sectional cylindrical body as illustrated, and the shapes of the outer cylindrical body and the inner cylindrical body are each rectangular. It is also possible to use a cross-section cylindrical body and a rectangular cross-section cylinder, a circular cross-section cylinder and a rectangular cross-section cylinder, a circular cross-section cylinder and a circular cross-section cylinder.

Further, the orifices 18 provided in the inner cylinder are not limited to being arranged in a line in the longitudinal direction.
For example, as long as the air blown out from the orifice does not blow out directly to the nozzle of the outer cylinder, it is not necessary to arrange them in a line, and they may be arranged randomly in the circumferential direction. In the illustrated embodiment, one end of the outer cylinder is a closed end. For example, as shown in FIG.
It is also possible to introduce air from both sides of the outer cylinder.

[0048]

According to the air curtain device of the present invention, an inner cylinder having an orifice for blowing air only from the vicinity of the center in the longitudinal direction, and an outer cylinder having a nozzle for blowing air from the entire longitudinal direction are provided. Due to the double pipe structure, the shortage of the air blowing amount in the vicinity of the center is eliminated. As a result, at least about 5,000 to 60 so that it can be used satisfactorily even in a wide and long roller as used in a feeding machine or the like.
An air curtain device can be provided that provides a substantially uniform pressure distribution over a width of 00 mm.

[0004] Further, since only a double pipe structure is used, the structure is simple, the nozzle arrangement and processing are easy, the manufacturing cost is low, and the sliding assembly is possible, so that maintenance such as cleaning and repair is maintained. An easy-to-handle air curtain device that can easily achieve work can be provided.

Further, since the amounts of the high-pressure air introduced into the outer cylinder and the inner cylinder are respectively dispersed and adjusted, the pressure loss is small, the high-pressure air can be effectively utilized, and as a result, the blower to be used is reduced. It is possible to provide an air curtain device that can be reduced in size and operation cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an air curtain device 1 according to the present invention.
FIG. 2 is a diagram showing the structure and operation of a zero.

FIG. 2 is an air curtain device 1 according to the present invention.
It is a figure explaining the flow amount of high pressure air introduced into zero.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is an air curtain device 1 according to the present invention.
FIG.

FIG. 5 is an air curtain device 1 according to the present invention.
It is an example of the use state of 0, and is a figure which shows the whole system.

FIG. 6 is an air curtain device 1 according to the present invention.
It is a figure which shows a partial cross section in an example of the use state of 0.

FIG. 7 is a front view showing a modified example of the outer cylinder 12;

FIG. 8 is a plan view showing a modified example of the outer cylindrical body 12. FIG.

FIG. 9 is a diagram illustrating an example of a known air curtain device.

FIG. 10 is a diagram showing an example of another known air curtain device.

FIG. 11 is a diagram illustrating an example of another known air curtain device.

FIG. 12 is a diagram showing an example of another known air curtain device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Air curtain apparatus 12 ... Outer cylinder 12A ... High-pressure air introduction end part 12B ... Closure part 14 ... Inner cylinder 16 ... Blowing nozzle 18 ... Blowing orifice 22 ... Pressure curve 24 ... Positioning fin 26 ... Connection flange 28 ... Air curtain DESCRIPTION OF SYMBOLS 30 ... Solvent application device 32 ... Atomized solvent 34 ... Sparing object 40 ... Blower device 41 ... High pressure air hose 42 ... Air volume adjustment valve 43 ... Inverter control panel 44 ... Turbo blower 45 ... Air filter

Claims (8)

[Claims] 1. An outer cylindrical body 12 having one end serving as a high-pressure air introduction end 12A and the other end serving as a closed portion 12B, and an inner cylindrical body 14 having both ends opened and disposed therein. An air curtain device 10 having a double structure, wherein the outer cylinder 12 has a series of blowing nozzles 16 formed intermittently or continuously along one side surface. The air curtain device, wherein the cylindrical body 14 has a series of orifices 18 formed intermittently along one side surface. 2. The position of the outlet nozzle of the outer cylinder 12 and the position of the orifice of the inner cylinder 14 are determined by the orifice 1 of the inner cylinder 14.
2. The air discharge device according to claim 1, wherein the air discharged from the outer cylinder moves along the inner wall surface of the outer cylinder, and is arranged at a mutual position where the air is blown out from the blowing nozzle of the outer cylinder. Air curtain device. 3. The air curtain device according to claim 1, wherein the high-pressure air introduction end portion 12A is detachable from the outer cylinder body. 4. The air curtain device according to claim 3, wherein the inner cylindrical body has a circular cross-sectional shape, and the outer cylindrical body has a rectangular cross-sectional shape. 5. The air curtain device according to claim 4, wherein the inner cylindrical body has fins that slide fit into the corners of the outer cylindrical body. 6. A series of orifices 18 provided in the inner cylindrical body 14 extend along a region extending from the midpoint of the inner cylindrical body 14 to both sides thereof over a length of about の of the entire length of the inner cylindrical body 14, respectively. The air curtain device according to claim 1, wherein the air curtain device is formed. 7. The air introduced from the high-pressure air introducing end 12A is introduced into the inner cylindrical body 14 with ／ of the air amount and the remaining air is introduced between the inner cylindrical body 14 and the outer cylindrical body 12. Further, half of the air introduced into the inner cylinder 14 is discharged into the outer cylinder 12 through the orifice 18, and the other half is
These air discharged from the other end into the outer cylinder 12 and discharged from the inner cylinder 14 into the outer cylinder 12 are combined with the air directly introduced into the outer cylinder 12. The air curtain device according to claim 1, wherein the air curtain device is discharged from a blowing nozzle (16) of the outer cylinder (12). 8. An outer cylindrical body 12 having a rectangular cross-sectional shape, one end of which is a high-pressure air introducing end 12A which is detachable and the other end being a closed portion 12B, and a circular cross-sectional shape which is disposed inside and is open at both ends. An air curtain device 10 having a double structure comprising a fin 24 which slides into a corner of the outer cylinder 12, wherein the inner cylinder 14 comprises Has a series of blowing nozzles 16 that are formed intermittently or continuously from one end to the other end along one side surface, and the inner cylindrical body 14 is intermittent near the center along one side surface. And an orifice 18 formed in the inner cylinder 14, and a position of the blow-out nozzle of the outer cylinder 12 and an orifice position of the inner cylinder 14 are determined by the air discharged from the orifice 18 of the inner cylinder 14. Moved along the inner wall surface of the outer cylinder 12 After that, they are arranged at the mutual positions where they are blown out from the blowing nozzles 16 of the outer cylinder, and 2/3 of the amount of air introduced into the air curtain device is introduced into the inner cylinder 14, and the remainder is the inner cylinder. Half of the air introduced into the inner cylinder 14 is discharged through the orifice 18 into the outer cylinder 12, and the other half is introduced into the inner cylinder 14. These air discharged from the other end into the outer cylinder 12 and discharged from the inner cylinder 14 into the outer cylinder 12 are combined with the air directly introduced into the outer cylinder 12. An air curtain device, which is discharged from a blowing nozzle 16 of the outer cylinder 12.