JP2909460B1 - Dust collection method around equipment and its device - Google Patents

Abstract

An object of the present invention is to perform dust collection of a casting mist while controlling the diffusion of the casting mist using an air curtain and treating a gas having a small air volume as a processing target. SOLUTION: An air curtain generating device 4 for preventing gas from leaking from a portion not covered with a cover 2 surrounding a casting machine A is provided.
A large number of air guns 5 arranged in a row along the air curtain formation location so as to inject high pressure gas from the outer side of the cover 2 toward the cover inner side, Air gun 5 arranged along
And a control device that controls only a part of the air guns 5 to perform a jetting operation and controls the jetting air guns 5 to sequentially change in the air curtain forming region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to oil mist and oil smoke generated around various working equipment, such as casting mist generated by a casting machine, fine dust generated by a forging machine, and welding fume generated by a welding booth. A fluid that presents a gas phase as a whole (hereinafter, referred to as a “gas phase fluid”) including any fine mixture in a gas or a steam, such as a welding fume or a steam, is to be processed. As
The present invention relates to a method and an apparatus for removing dust from the gas phase fluid.

[0002]

2. Description of the Related Art Conventionally, for example, in a casting machine, as shown in FIG. 11, a range which does not hinder the work in a casting processing area is covered with a cover, and a gas phase fluid in the cover is mixed with a surrounding gas phase fluid. It was configured to suck and discharge with the blower of the dust collector.

[0003]

As described above, in the conventional structure in which the mist is simply sucked by the blower of the dust collecting apparatus, the mist to be diffused widely is collected, so that the suction target area is wide. In addition, a large suction device is required, which tends to increase the size of the device. In addition, if a filter is used to remove a casting mist containing a large amount of oil mist or dust, the filter is likely to be clogged. For this reason, at present, the dust collector is formed by using a coarse mesh having a mesh opening width of several mm, but it has been difficult to sufficiently purify the dust collector. In order to solve such a problem, for example, it is inconceivable to provide an air curtain at a portion where sealing with the cover is difficult, thereby reducing the suction area by the suction device. Attempts to seal the gas-phase fluid using an air curtain poses the following new problems. In other words, as an air curtain,
When a slit-type nozzle that ejects a high-pressure blower and a suction device that suctions a high-pressure blower that constitutes an air curtain is provided on the side facing the slit-type nozzle, a large amount of casting mist is sucked into the suction device. Since the air curtain device is clogged and cannot be used, such a blow-out / suction type air curtain device is not practical for the purpose of dust collection. The present invention is a method of collecting dust around a device, which can control the diffusion of a gas-phase fluid generated around the device by using an air curtain, and can perform dust collection with a small amount of a gas-phase fluid to be treated, Another object is to provide the device.

[0004]

In order to achieve the above object, the technical means of the method of the present invention is to provide a dust collecting cover around the apparatus and to collect the dust by sucking a gas phase fluid in a space inside the cover. In the method, the gas-phase fluid leaks from a portion not covered with the cover, and the ejected gas injected from the outside of the cover toward the inside of the cover is collected together with the gas-phase fluid in the inside space of the cover by a dust collecting device. While blocking with an air curtain formed by sucking in, the ejected gas,
The air curtain is formed by injecting only a part of the air curtain formation scheduled area and sequentially moving the jetting position of the ejected gas in the part of the air curtain formation scheduled area.

[0005] The technical means of the apparatus of the present invention taken to achieve a similar object includes a dust collecting cover provided around the apparatus,
In a dust collecting device around the device including a suction device that sucks a gas phase fluid in the cover internal space, an air curtain generating device that prevents leakage of a gas phase fluid from a location not covered by the cover is provided, A large number of air guns arranged in a row along a portion where an air curtain is to be formed, such that the air curtain generating device injects high-pressure gas from an outer side of the cover toward an inner side of the cover; and Only a part of the air guns arranged along the formation scheduled part are operated by jetting, and
And a control device for controlling the air gun that performs the spraying operation to change sequentially in the air curtain forming region.

According to a third aspect of the present invention, a cover provided around the device has a lower end bent portion bent toward the inside of the cover at a lower end, and an air gun is provided below the lower end bent portion. It is preferable that the air gun is arranged and the jetting direction of the air gun is set obliquely upward on the inner side of the space inside the cover.

According to a fourth aspect of the present invention, in order to configure a processing device around the equipment, a dust collection cover provided around the equipment,
A suction device that suctions a gas phase fluid in the space inside the cover, and an air curtain generation device that prevents leakage of the gas phase fluid from a location not covered by the cover, and the air curtain generation device A large number of air guns arranged in a row along the planned air curtain formation location so as to inject high-pressure gas from the outside of the cover toward the cover inside, and along the planned air curtain formation location A dust collecting device including a control device for injecting only a part of the arranged air guns and controlling the injecting air gun to sequentially change in the air curtain forming area; A louver unit that removes oil from the gas phase fluid while changing its flow direction while coming into contact with the gas phase fluid to be treated collected by the dust device. If, finer dust from the gas phase fluid after being processed by the louver unit may be configured in combination with a purifier comprising a filter device for adsorbing and removing.

[Operation] The operation of the above-described technical means is as follows. a. In other words, the cover and the air curtain are used so that the gas-phase fluid can be processed only in the processing area around the equipment as the main processing object, not in the entire space in the factory as the object of dust removal. It is possible to reduce the amount of the target gas-phase fluid. b. Then, by ejecting the ejected gas for forming the air curtain to only a part of the air curtain formation scheduled area, and sequentially moving the ejection position of the part of the ejected gas within the air curtain formation scheduled area. The air curtain is formed. This means that, for example, when a high-pressure gas is jetted from the entire air curtain forming area using a slit type nozzle, on the suction side, the air jetted out as an air curtain is also sucked into the dust collector together with the gas phase fluid. Therefore, the amount of suction on the dust collector side increases, and the effect of reducing the suction amount on the dust collector side by using a corner and a cover or an air curtain diminishes. Problem can be solved. c. In addition, when forming the air curtain, the air curtain is formed while sequentially moving the injection position of the high-pressure gas, so that a wide range of air curtain can be configured with a small amount of jetting, and accordingly, the suction device side can be used. The suction amount of the gaseous phase fluid can be reduced, and the amount of processing in the dust collector can be reduced. d. Further, in the method of forming an air curtain using a slit-type nozzle over the entire range of forming an air curtain, the reach distance of the gas forming the air curtain is short unless the ejection pressure is increased very much (as a result, the air volume increases). Although the effective distance of the air curtain cannot be made so large, by sequentially using an air gun as described in claim 2, the air jet can be formed at the ejection port of each air gun with a small air volume. By increasing the ejection pressure, the reaching distance of the air curtain can be set to be relatively large. By employing an air gun, the ejector effect of entraining the surrounding gas-phase fluid with a small amount of blowing air can also be effectively exerted. As a result, mist that once overflows from the portion where the air curtain is to be formed to the outside can be re-invited if it is within the range where the ejector effect can be exerted. e. As described in claim 3, a lower end bent portion is formed at the lower end of the cover of the dust collector, and the blowing direction of the nozzle is set to be obliquely upward from the lower side of the lower end bent portion of the lower end of the cover. The flow of the gaseous fluid containing the mist is directed inward at the bent portion at the lower end of the cover, and the mist or the like is easily sealed inside by the ejector effect of the air directed obliquely upward toward the inside. f. As described in claim 4, a dust collector provided with a cover that covers the periphery of the device, and an air curtain generator configured to form an air curtain portion so as to push mist to be leaked from the cover into the cover, First, oil mist is removed from the dust collected by the dust collector, and then the dust is adsorbed and removed.
It is possible to remove dust while avoiding clogging of the processing apparatus.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. [Explanation of Processing Equipment] First, an apparatus used for the method of collecting dust around equipment according to the present invention will be described. FIG. 1 shows a casting mist treatment device in a casting machine A as an example of a device to be collected. This casting mist treatment device removes dust including dust mist and the oil mist collected by the dust mist collecting device 1 with respect to a casting machine A installed in a part of a factory, and treats it. And a purifying device 30 for discharging the used gas phase fluid.

[Explanation of Dust Collector] The dust collector 1 has a cover 2 that covers the periphery of the device, and an air curtain that forms an air curtain portion so that mist that is to leak from the cover 2 is pushed into the cover 2. A curtain generating device 4, a suction device for sucking the gas phase fluid in the cover 2, and an air guide tube 3 for guiding the gas phase fluid in the cover 2 to the suction device
It is composed of The cover 2 has a robot B
An entrance 2b is formed to allow the work to be taken out of the cover 2 and a gap is provided between the lower end of the cover 2 and the floor surface F.

As shown in FIGS. 2 and 3, the air curtain generator 4 horizontally partitions the space between the cover 2 and the casting machine A at a position below the lower edge of the cover 2. Many air guns 5 arranged in rows in the horizontal direction
(A small-diameter, for example, an air-injection nozzle having a circular diameter of about 6 mm, which is referred to as an air gun in the specification of the present invention), a pressure gas supply device (not shown) for supplying a high-pressure gas to the air gun 5, The control device controls the operation of an on-off valve 6 that controls whether or not high-pressure gas is ejected from the air gun 5.

The air gun 5 is arranged below the lower end bent portion 2a of the cover 2 in a row along the horizontal direction.
In a plan view, as shown in FIG. 3, the distance between the center of the holes of each of the discharge ports is about 55 mm, for example, such that the blown-out gas-phase fluids can partially polymerize to form an air curtain. Many are installed at small intervals. The jet direction of the gas-phase fluid blown out from the air gun 5 is set so as to blow out slightly upward with respect to the horizontal plane, and the gas-phase fluid that is going to descend along the cover wall surface is moved at the lower edge of the cover 2. It has a function of guiding the cover to turn upward in the cover inward by cooperating with the guiding action by the shape of the lower end bent portion 2a or by the wind pressure or the ejector action of the gas-phase fluid ejected from the air gun 5. ing. The injection angle of the air gun 5 with respect to the horizontal plane is the distance from the cover wall surface to the mold or the pedestal, that is, the opening interval on the lower side where the gas phase fluid inside the cover may leak is about 500 mm,
When the injection pressure is 1.5 kgf / cm ² , for example, 10 °
15 °, preferably about 12 ° is desirable,
The distance from the cover 2 to the mold and the injection pressure may be changed as appropriate. In short, the gaseous fluid descending along the cover wall is restricted from leaking downward. The angle may be set to a suitable angle for changing the direction so as to be directed upward again inside the cover.

An example in which the injection angle of the air gun 5 is not proper is shown in FIGS. In FIG. 4A, since the injection angle of the air gun 5 is as large as about 50 ° upward, it is difficult for the air curtain to cross the opening interval on the lower side. Then, a downward gas flow along the upper and lower sides of the air curtain tends to occur in a range where the ejector effect by the air flow of the air curtain does not reach, and the gaseous fluid leaks easily. In FIG. 4B, the injection angle of the air gun 5 is about 0 °, and the blown-out gas-phase fluid collides head-on with the mold or pedestal at the opposing position and is scattered in up, down, left, and right directions. However, the turbulent flow is unlikely to form an air curtain, and the turbulent flow generated downward may cause leakage of the gas-phase fluid.

FIG. 5 is a table showing the relationship between the pressure of the pressurized gas from the air gun 5 and the wind speed. This table shows the correlation between the wind speed and the jet pressure at a position 500 mm away from the tip of the nozzle having an inner diameter of 6 mm. In the present invention, the wind speed of 3.6 m / sec is effective for containing mist.
In order to obtain a wind speed of not less than c, the set pressure of the gas ejected by the pressure gas supply device (gas pressure on the primary side of the on-off valve 6) is set to 1.5 kgf / cm ² or more.

As for the air guns 5 arranged in a row, two air guns at adjacent positions with a small interval are jetted at the same time, and the remaining air guns 5 stop jetting the gas-phase fluid. The air curtain is formed by sequentially moving the positions of the two air guns 5 in the jetting state in a short cycle. As described above, a technique of forming an air curtain by setting only a part of the row of air guns 5 to the ejection operation state and sequentially moving the position of the air gun 5 in the ejection operation state is described. Thus, the amount of high-pressure gas for forming the air curtain is greatly reduced as compared with the case of forming a normal air curtain. In order to perform the containment of dust by the sequential injection type air curtain in which the injection position is sequentially moved, for example, adjacent space regions such as a cooling room and the outside or a sterile room and the outside are used. It is not an air curtain that strictly partitions the space so that it is always kept under a certain condition, but drifts to some extent in the space, such as mist and dust generated by spraying a release agent. This is particularly effective in the case where something that is going to flow out is contained.

As a pressure gas supply device for supplying a high pressure gas to the air gun 5, factory air is used.
A dedicated compressor may be separately provided.

Whether or not high-pressure gas is ejected from the air gun 5 is determined by opening and closing an on-off valve 6 provided in a pressure gas supply path from the pressure gas supply device to the air gun 5.
The on-off valve 6 is an electromagnetic valve whose opening and closing is controlled based on a command from a control device (not shown), and the operation timing thereof is set as shown in FIG. 6 or FIG. That is, as shown in the time chart of FIG. 6, the first and second two air guns 5 at positions adjacent to each other are simultaneously jetted out of the 14 air guns 5 arranged in the horizontal direction. Then, the third and fourth air guns next to the air guns are simultaneously jetted, two air guns 5 are sequentially switched to the simultaneous injection state, and the other air guns 5 are switched to the supply stopped state. Each air gun 5 at this time
Is set to 0.1 second, and the time required for one cycle in which the high-pressure gas injection from the 14 air guns 5 is performed once is 0.7 second.

The control relating to the injection of the high-pressure gas from the air gun 5 can be changed in various ways. For example, the number of air guns 5 to be simultaneously injected, the injection time of each of the air guns 5, and the time interval before the injection of the air gun 5 to be injected next to the air gun 5 in the current injection state is also suitable. For example, as shown in the time chart of FIG. 7, the injection time of each air gun 5 is set to 0.1 second, and the first air gun 5 injects the high-pressure gas. After the start, the injection of the next air gun 5 is started before the injection of the preceding air gun 5 is completed, for example, the injection of the second air gun 5 is started 0.05 seconds later. A configuration may be adopted in which simultaneous injections that do not coincide with each other in time are partially simultaneous injections that partially overlap in time.

[Dust Collection Method] The dust collection method of the casting mist according to the present invention is carried out by using the above-mentioned dust collection device as in the following (1) to (3). (1) Leakage of gas-phase fluid from a location not covered by the cover 2 covering the periphery of the casting machine A is prevented by an air curtain.
Is formed by sucking out the gas ejected from the air gun 5 from the outside toward the inside of the cover 2 together with the gas phase fluid in the space inside the cover 5 by a dust collecting device. (2) Then, the injection of the high-pressure gas by the air gun 5 is performed from a part of the air guns 5 arranged in a large number of rows so that the injection of the high-pressure gas is performed only on a part of the area where the air curtain is to be formed. Inject. (3) In addition, the air gun 5 in the injection state is sequentially switched to form the air curtain so that the injection position of the gas ejected from the air gun 5 is sequentially moved within the air curtain formation scheduled area.

[Mist Collector] A suction device for sucking the gaseous phase fluid in the cover 2 is installed in a mist collector installed outside the factory building. This mist collector is a purifying device 30 configured to house the suction device portion of the dust collecting device, and as shown in FIGS. Is provided with a processing path for removing dust while passing through the air passage. The processing path includes a processing path for removing relatively coarse dust in the gas-phase fluid to be processed sucked and introduced from the suction port 40. The processing unit 50, an intermediate processing unit 60 that applies a centrifugal force to the gas-phase fluid that has passed through the pre-processing unit 50 to remove medium dust in the gas-phase fluid to be processed, and passes through the intermediate processing unit 60. And a final processing unit 70 for removing fine dust from the vapor phase fluid.

The pre-processing unit 50 includes a buffer unit 10 provided on the front side of the pre-processing case 20 so as to face the intake port 40 for the gas-phase fluid to be processed, and a louver unit 11 provided on the back side thereof. And a combination of

The baffler unit 10 has a receiving surface 12A which collides with a gas-phase fluid to be treated, on the front side of a shallow dish-shaped barrier member 12 made of a metal plate. The first filter 13 made of is adhered. This barrier 12 has its receiving surface 1
An annular hood 12B is provided on the outer peripheral portion of 2A, and when the gas-phase fluid to be treated introduced from the intake port 4 collides with the receiving surface 12A constituted by the shallow-bottomed dish-like wall surface, the treatment is performed. The gas-phase fluid is configured to provide resistance to escape radially outward. The annular hood 12
In the lower peripheral surface of B, a discharge hole 14 is formed to allow movement of the gas-phase fluid to be processed downward, and the dynamic pressure of the gas-phase fluid that has collided with the receiving surface 12A is downward. It is configured to act on. As a result, the large particles and coarse dust of the oil mist in the gas-phase fluid to be treated that have collided with the receiving surface 12A are captured by the first filter 13 and the oil mist captured by the first filter 13 Is configured to be positively discharged from the discharge hole 14 by a downward dynamic pressure of the gas-phase fluid to be processed. The receiving surface 1 of the barrier 12
Below 2A, a communication hole 16 is formed for guiding the flowing waste material including oil mist and dust that have exited the discharge hole 14 to the first drain chamber 15 below.

The louver unit 11 is constructed by incorporating a lattice-like louver 19 and a gutter-like louver 21 in a layered state in a state of being provided in an outer frame 18 so as to have an area covering the entire cross section in a pretreatment case 20. By removing the ceiling plate 20A of the pre-processing case 20 or setting it to the open position, the entire outer frame 18 can be extracted from the inside of the pre-processing case 2.

The lattice-shaped louver 19 is formed by stamping a plate surface of a metal plate material with a predetermined width in a predetermined direction, and forming a large number of ventilation holes 23 and punching projections 24 over the entire plate surface.
Are formed, and a plurality of yoro-shaped plate members are formed so as to pass while changing the ventilation direction to approximately 90 degrees.

The trough-shaped louver 21 contacts the gas-phase fluid to be processed passing through the processing path in the casing and changes the flow direction of the gas-phase fluid to be processed so that the upper and lower sides of the gas-phase fluid to be processed are changed. In each of the above, the air guide members 25 and 26 each composed of a large number of cloth-like filters having a U-shaped cross section are disposed so that the open sides of the U-shape face each other and are displaced in the plane direction. It is constituted by. In addition, it has a gas permeability that allows a part of the gaseous fluid to be processed to pass through the guide surface, and a collecting function for adhering dust in the gaseous fluid to be contacted. In order to realize the air permeability and the dust collecting function, specifically, the cloth-like filter is made of a non-woven fabric of polyester.

A suction fan 33 serving also as a suction device as a component of the dust collecting device 1 is provided in the intermediate processing unit 60.
Is disposed on the outer periphery of the suction fan 33, and a drum-shaped suction filter 34 is disposed on the outer periphery of the suction fan 33. At the boundary between the vertical front chamber 31 and the horizontal rear chamber 32 of the intermediate processing section 60, these two chambers are provided. An intermediate processing unit 60 is configured by providing a separate demister 35 in a state of partitioning 31 and 32. The horizontal rear chamber 32 has a final filter 3.
6 is provided.

A so-called HE is provided in the horizontal rear chamber 32.
Cloth-like filter element 3 made of extremely fine fiber of about 1 micron diameter called PA filter
A final filter 36 is provided in which a large number of 6a are arranged along the flow direction of the gas phase fluid, and a filter element 36 of the final filter 36 is provided.
A final processing unit 70 is configured to pass the gaseous phase fluid during a to remove almost any remaining oil mist and fine dust almost completely. The ceiling of the horizontal rear chamber 32 is formed with an upward exhaust port 8 for discharging the processed gaseous fluid to be processed, and an electric motor for driving the suction fan 33 is provided on the lateral side. The motor 9 is mounted and fixed.

[Other Embodiments] [1] Simultaneous ejection of high pressure gas by air gun 5 is 2
Not only the air guns but also three or more air guns may be ejected at the same time, and some or all of the simultaneously ejected air guns emit high-pressure gas from the air gun 5 in the next area when the ejection is stopped. It may be configured to blow out. Alternatively, the air may be ejected from only one air gun 5 in the row, and the ejection target position may be sequentially changed.

[2] The ejection pressure of the high-pressure gas from the air gun is not limited to the above-mentioned set pressure, but may be set so that a suitable air curtain is formed according to the application device and application location. Further, the ejection time of the high-pressure gas from the air gun and the cycle until the next air gun is ejected can be appropriately set so that a suitable air curtain is formed according to the application device and the application location.

[3] The rows of the air guns 5 may be formed in a plurality of upper and lower stages. In this case, it is desirable that the upper air gun 5 and the lower air gun 5 are set so that the jetting timing of each other or the cycle until the next air gun is jetted is different, but they may be the same.

[4] The timing of the ejection of the high-pressure gas by the air gun 5 is performed by an arbitrary operation at an arbitrary time and at an arbitrary time interval, and is automatically set in association with the ejection timing of the release agent. Alternatively, the ejection may be automatically performed for a predetermined time at an appropriately set time interval. As described above, setting the spout timing automatically at an arbitrary time or in accordance with the timing of occurrence of mist or the like is effective in reducing the consumption of high-pressure gas. The setting of the ejection timing is effective when mist or the like is not temporarily generated.

[5] The dust collecting method, the dust collecting device, and the processing device of the present invention are not limited to the mist treatment of the casting machine described in the above embodiment, but may be a dust collecting by a forging machine or various types of machining. The present invention can be applied to various devices that generate mist, oil smoke, dust, fume, and the like, such as machines and welding equipment.
When applied to these various devices, the cover provided around the devices only needs to be provided in a range that does not hinder the work around the devices, and the formation range and the formation timing of the air curtain can be controlled by each device. What is necessary is just to set suitably according to the generation state of a phase fluid, etc.

[0033]

The effects of the above configuration are as follows. That is, dust can be removed only in a processing area around the equipment, not in the entire space in the factory as a dust-removing target. In this respect, the amount of gas-phase fluid to be treated can be reduced. Then, since the jet gas for forming the air curtain only needs to be jetted to a part of the area where the air curtain is to be formed, the air jetted as the air curtain is also sucked into the dust collector together with the gas phase fluid. In spite of this, the suction amount on the dust collecting device side is reduced as compared with the case where high-pressure gas is ejected to the entire air curtain forming region, and processing by a small dust collecting device becomes possible. In addition, by sequentially using an air gun as described in claim 2 to increase the ejection pressure at the ejection port of each air gun with a small air volume, the reaching distance of the air curtain is set to be relatively large. And the ejector effect of entraining the surrounding gas-phase fluid with a small amount of blown air can be effectively exerted. As a result, efficient dust collection can be performed, such as mist that once overflows from the portion where the air curtain is to be formed and that is floating within the range where the ejector effect can be applied.

According to a third aspect of the present invention, a lower end bent portion is formed at the lower end of the cover for covering the device and bent toward the inside of the cover. If it is set diagonally upward on the inner side of the space, the flow of gaseous fluid including mist etc. is directed inward at the bent portion of the lower end of the cover, and mist is directed inward by the ejector effect of air directed diagonally upward inside. Easy to enclose.

When the gas-phase fluid is processed using the dust collecting device and the purifying device according to the fourth aspect, the gas-phase fluid can be processed by a small-sized device while avoiding the increase in the gas-phase fluid to be processed as described above. Fluid treatment can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an entire casting mist treatment facility.

FIG. 2 is a side view of an air curtain generator.

FIG. 3 is a plan view of an air curtain generator.

FIG. 4 is a side view of a comparative example of an air curtain generator.

FIG. 5 is a table showing a relationship between an ejection pressure and an ejection speed of an air gun.

FIG. 6 is a time chart showing the operation timing of the air gun.

FIG. 7 is a time chart showing the operation timing of the air gun.

FIG. 8 is an exploded perspective view of a mist collector.

FIG. 9 is a sectional view of a mist collector.

FIG. 10 is a partially enlarged sectional view of a mist collector.

FIG. 11 is an explanatory view showing a conventional example of a casting mist treatment facility.

[Explanation of symbols]

 A Casting machine B Robot 1 Dust collector 2 Cover 4 Air curtain generator 5 Air gun 10 Louver unit 30 Purifier

Claims (4)

(57) [Claims] 1. A method of providing a dust collection cover around an apparatus and sucking a gas phase fluid in a space inside the cover to collect dust, wherein leakage of a gas phase fluid from a portion not covered by the cover is performed. The ejected gas ejected from the outer side of the cover toward the inner side of the cover is prevented by an air curtain formed by suctioning the ejected gas together with the gas phase fluid in the inner space of the cover by a dust collector, and the ejected gas is air. Dust collection around a device that forms the air curtain by injecting only into a part of the curtain forming area and sequentially moving the jetting position of the ejected gas in the air curtain forming area. Method. 2. A dust collecting device around a device, comprising: a dust collecting cover provided around the device; and a suction device for sucking a gas phase fluid in a space inside the cover, wherein a dust collecting device is provided from a portion not covered by the cover. Providing an air curtain generating device for preventing leakage of a gaseous fluid, the air curtain generating device is configured to inject a high-pressure gas from an outer side of the cover toward an inner side of the cover, so that an air curtain is to be formed. A large number of air guns arranged in a row along the air gun, and only a part of the air guns arranged along the air curtain forming scheduled portion are operated for jetting, and the air gun to be jetted is operated in the air curtain forming area. And a control device for controlling so as to change sequentially within the device. 3. A cover provided around the device has a lower bent portion formed at a lower end thereof bent inward of the cover, and an air gun is disposed below the lower bent portion,
The dust collecting device according to claim 2, wherein the direction of the air gun is set obliquely upward on the inner side of the space inside the cover. 4. A dust collecting cover provided around the apparatus, a suction device for sucking a gas phase fluid in a space inside the cover, and an air for preventing a gas phase fluid from leaking from a portion not covered by the cover. A curtain generating device is provided, and the air curtain generating device is arranged in a line along the planned air curtain forming portion so as to inject high-pressure gas from the outside of the cover toward the inside of the cover. A large number of arranged air guns, and only a part of the air guns arranged along the air curtain formation scheduled portion are operated for jetting, and the air guns for jetting are sequentially changed in the air curtain forming region. A dust collecting device comprising a control device for controlling the flow rate of the gas to be treated collected by the dust collecting device and changing the flow direction thereof. It is composed of a combination of a louver unit that removes oil in the gaseous phase fluid and a purification device that includes a filter device that adsorbs and removes finer dust and the like from the gaseous phase fluid that has been processed by the louver unit. Processing equipment around the equipment.