JP2000146247A - Local exhausting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the prevention of fire due to the spark of welding as well as the normal formation of spiral air flow in a local exhausting device, blowing air out along the front surface of a curved wall, and inducing the same toward the side of the curved wall to form spiral air flow while contaminated air is induced by the spiral air flow to discharge the same, by a method wherein liquid is supplied to the spiral air flow to bring the spiral air flow into humid condition. SOLUTION: The housing 1 of a local exhausting device employed for arc welding work or the like is formed so as to have the shape of a fox having an opening 14 at a side opposed to a back surface wall 12 while a working table is arranged on the bottom unit of the opening 14. An upwardly curved wall 2 is provided inside of the back surface wall 12 and an air blow-off pipe 3 is arranged at the upper end part the curved wall 2. Air blow-out ports 31 blowing air out obliquely downward are formed on the air blow-off pipe 3, and airflow produced by a fan 4 is flown off while simultaneously contaminated air is discharged out of air inducing ports 5 through a duct 51. Liquid supplying devices 6 are provided at the proper places of the working table 15 and spiral air flow B is brought into humid condition by the spray of water drops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local exhaust system.

[0002]

Dust damage due to welding fumes resulting from arc welding operations is still considerable in the number of new pneumoconiosis findings. Therefore, in response to a strong request from the Ministry of Labor, the Japan Welding Association has formulated a Dust Prevention Measures Promotion Campaign Implementation Plan, and has been promoting promotion campaigns, such as calling on welding establishments nationwide to thoroughly disseminate dust prevention measures. are doing.

[0003] As part of this propulsion campaign, matters concerning the promotion of the installation of local exhaust systems are included in the promotion guidelines. As an example of a conventional local exhaust device, there is an apparatus disclosed in Japanese Patent Publication No. 6-70512. As shown in FIG. 2, this device blows air from an air-blowing pipe b to the front surface of a curved wall a and sucks it toward the curved wall a through a suction port c to form a vortex d. It is configured so that the contaminated air e is sucked by d and exhausted.

However, the above-mentioned conventional local exhaust system has the following problems. <A> If dust such as oil or fiber from the welding fume adheres to the inner surface of the exhaust duct, a spark during welding may ignite there and cause a fire.

<B> When the door is open or the cooler is in operation, the vortex is not normally formed due to the airflow, so that the exhaust function may be deteriorated.

[0006]

The object of the present invention is to solve the above problems.
An object of the present invention is to provide a local exhaust device capable of preventing a fire due to a welding spark and normally forming a vortex.

[0007]

As a means for solving the above-mentioned problems, the present invention blows air toward the front of a curved wall and sucks air toward the curved wall to form a vortex. A local exhaust device that sucks air and exhausts air, wherein a liquid is supplied to the vortex to make the vortex wet.

[0008]

Embodiments of the present invention will be described below with reference to FIG. In the following description, the exhaust of the welding fume will be described as an example. However, the present invention can be used not only for removing dust, gas, odor, oil mist, etc., but also for the apparatus of the present invention.

<A> Housing The housing 1 includes a top plate 11, a rear wall 12, and both side walls 1.
3 (one side not shown), and has a box shape in which an opening 14 is formed on the side facing the back wall 12. Also,
At the bottom of the opening 14, a worktable 15 is formed which projects horizontally from the rear wall 12. The work table 15 may not be provided.

<B> Curved Wall The curved wall 2 is formed by curving upward from the back wall 12.
The wall extends to the end of the top plate 11 on the opening 14 side. The curved wall 2 may be formed by a combination of straight lines.

<C> Air-Blow Pipe A predetermined length of the air-blow pipe 3 is attached to the upper end of the curved wall 3. The air outlet pipe 3 has a plurality of outlets 31 for blowing air obliquely downward.

<D> Blower The blower 4 is in communication with the back side of the air blow-out pipe 3, and blows air from the blow-out port 31 by sending air from the blower 4 under pressure. A can be formed.

<E> Air-suction port Air-suction ports 5 are respectively opened at predetermined opposing positions of the side walls 13 on both sides. This air-suction port 5
Is connected to a blower (not shown) by a duct 51 or the like, and draws the generated air curtain A toward the curved wall 2 to generate a negative pressure for forming a vortex B.

<F> Liquid Supply Apparatus The liquid supply apparatus 6 supplies liquid particles such as water to the vortex B to make the vortex B or its surrounding space wet. For example, an ultrasonic or heating humidifier can be used, but there is no particular limitation as long as it can supply a liquid.

As the liquid to be supplied, in addition to water, various chemicals can be used alone or mixed with water. Also,
If a cooled liquid is used, the cooling effect of the welding spark can be further enhanced.

As shown in FIG. 1, the liquid supply device 6 can be supplied to the vortex B at a mounting position such as a structure communicating with the blower 4 or a structure mounted on the bottom surface of the worktable 15 and ejecting upward. There is no particular limitation on the position.

[0017]

Since the present invention has been described above,
The following effects can be obtained. <A> Since the liquid particles are mixed in the vortex due to the supply of the liquid, and the vortex or the surrounding air is in a wet state, the spark during welding can collide with the liquid particles and be cooled.
Therefore, it is possible to prevent a fire caused by a spark during welding.

<B> Since the eddy current becomes visible due to the mixture of the liquid particles, it can be visually confirmed that the eddy current is not formed normally, and the eddy current can be quickly corrected. Therefore, it is not necessary to perform the operation with the exhaust function lowered.

<C> Since dust particles such as welding fumes are trapped and exhausted in the liquid particles, the exhaust efficiency can be improved.

<D> The liquid particles that have captured the dust particles are aggregated to increase the particle size. Therefore, after the particles aggregated by the larger filter are subjected to the primary filtration treatment, the remaining small particles can be treated by the secondary filter. Therefore, the burden of filtering on the filter can be shared and the life of the filter can be prolonged, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional technique.

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[Procedure amendment]

[Submission date] October 14, 1999 (1999.10.
14)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

As a means for solving the above-mentioned problems, the present invention blows air toward the front surface of a curved wall and sucks air toward the curved wall side to form a vortex. A local exhaust device for suctioning and exhausting, wherein a liquid is supplied to the vortex and an open space around a contaminated air source is wetted.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akihiro Imon 3rd floor, Takeuchi Building, 2-35-12 Minamiotsuka, Toshima-ku, Tokyo F-term (reference) 3L058 BE08 BK01 BK10

Claims (1)

[Claims] 1. A local exhaust device that blows air to a front surface of a curved wall and sucks air toward the curved wall to form a vortex, and sucks and exhausts contaminated air by the vortex. A local exhaust system, characterized in that it is configured to supply and vortex the water.