JP2000254428A - Welding fumes recovering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fumes recovering device capable of removing the fume components stuck onto a filter element by ejecting large amount of air in a short time even using the compressed air having relatively low pressure. SOLUTION: In the welding/flame cutting fumes recovering device for sucking and recovering the welding fumes generated at a welding/flame cutting working part, a filter 7 is constituted of a cylindrical cartridge type filter. A Venturi forming member 10 is fitted at the communicating side of the cartridge type filter 7 to a blower 8. An air jetting nozzle 11 for jetting intermittently cleaning air is arranged on the downstream side of the sucked flow of the Venturi forming member 10 toward the Venturi forming member 10. The space at the connecting side of a fumes suction pipe in a casing and the outside of the casing are communicatingly connected by interposing a negative pressure control valve 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fume collecting apparatus for collecting and removing fume (fine dust) during welding and fusing operations, and more particularly to a fume collecting apparatus using a cylindrical cartridge filter.

[0002]

2. Description of the Related Art Various devices have been conventionally provided for collecting fumes generated during welding and fusing operations. In this type of device, the inside of the casing is sectioned by a filter, and one of the sections is connected to a welding or fusing work place via a suction duct, and the other section is connected to the suction port of the blower, and is connected to the blower. The suction force generates a suction wind at the work location, and the fume is taken into the casing.

[0003] The fumes taken into the casing are caught by the elements of the filter, and clog the filter element. Therefore, it is necessary to frequently clean the filter element.
As a technique for cleaning the filter element, conventionally, compressed air is continuously or intermittently injected from a secondary side of the filter element.

[0004]

In the case where compressed air continuously acts on the filter element, one of the filter element and the compressed air jet nozzle is rotated to remove trapped fume from the entire surface of the filter element. Therefore, there is a problem that the consumption of the jet air is increased.

[0005] In the method in which the compressed air is intermittently applied to the filter element, the compressed air is ejected in a short time to give vibration and deformation to the filter element due to a pressure change in the casing caused by the ejection of the compressed air.
In this case, the fumes attached to the filter element are removed.In this case, the greater the differential pressure between the internal pressure of the casing and the ejection pressure, the greater the vibration force applied to the filter element and the higher the dust removal capability. In the recovery device, when the filter element is backwashed with air, the air flow path is blocked on both the suction duct side and the blower side, and the internal pressure of the casing rises, making it difficult to take sufficient differential pressure with the jet air In addition, there is a problem that a large capacity tank must be installed because a large amount of compressed gas is required instantaneously.

In view of such a point, the present invention is directed to a fume capable of removing a fume component adhering to a filter element by ejecting a large amount of air in a short time even with compressed air having a relatively low pressure. An object is to provide a recovery device.

[0007]

In order to achieve the above-mentioned object, the present invention provides a filter comprising a cylindrical cartridge type filter, and a venturi forming member mounted on a side of a communication chamber with a blower in the cartridge type filter. An air ejection nozzle for intermittently ejecting cleaning air toward the Venturi member is disposed downstream of the suction flow of the Venturi forming member, and a negative pressure adjustment valve is provided between the space inside the casing on the fume suction pipe connection side and the outside of the casing. It is characterized in that the communication connection is made via a.

[0008]

According to the present invention, the filter is constituted by a cylindrical cartridge type filter, and a venturi forming member is mounted on the holding section of the cartridge type filter on the side of the communication chamber with the blower. An air ejection nozzle that intermittently ejects cleaning air toward the Venturi member is arranged on the downstream side, and the space inside the casing on the fume suction pipe connection side and the outside of the casing are connected and connected via a negative pressure adjustment valve. By adjusting the pressure with the negative pressure adjusting valve, the inside of the casing does not become too high at a predetermined pressure (atmospheric pressure), and a constant pressure difference between the ejection pressure of the cleaning air to be ejected and the casing internal pressure can be maintained. As a result, a sufficient amount of cleaning air can be supplied. Also, the cleaning air that has been blown out is fed into the cylindrical filter element at an increased flow rate in the venturi, and adheres to the filter element due to a pressure change caused by the expansion of the cleaning air that has flowed in over the narrow part. The separated fumes can be reliably separated.

[0009]

FIG. 1 is a schematic sectional view showing an embodiment of a welding fume collecting apparatus to which the present invention is applied. This welding fume collecting device forms a compartment in a casing (1), and a ventilation port is formed in a partition wall (4) between a first chamber (2) and a second chamber (3).
(5) and a fume suction pipe in the first chamber (2)
(6) is connected and a filter (7) is mounted in the second chamber (3). The filter (7) is provided with a cylindrical cartridge type filter element (7a), and the inside of the filter element (7a) is provided with a suction port (9) of a small high static pressure variable motor rotation type brushless turbo blower (8). Is connected to

A venturi member (10) is provided at a communication port portion between the internal space of the filter element (7) and the blower (8), and a venturi member is provided on the blower (8) side of the venturi member (10). A cleaning air injection nozzle (11) is arranged opposite to (10). Further, a pressure reducing damper (12) as a negative pressure regulating valve is provided on a side wall of the second chamber (3) so that the pressure in the second chamber (3) does not become higher than the atmospheric pressure.

The high-pressure air supplied to the cleaning air injection nozzle (11) is supplied from an air tank (not shown) disposed outside the casing (1).
The air tank is supplied from a high-pressure air source such as a compressor.

In the welding fume collecting apparatus having the above-described structure, the suction port of the blower (8) is operated with the operation of the blower (8).
Negative pressure is generated in (9). This negative pressure causes the welding fume to be taken into the casing (1) via the fume introduction pipe (6). The welding fume flowing into the casing (1) flows from the first chamber (2) to the second chamber (3) through the ventilation port (5) formed in the partition wall (4), and flows into the second chamber (3). The filter element (7a) mounted on the filter element (7a) removes the fume component, and the air flow from which the fume component has been removed is sucked into the blower (8) through the venturi member (10) and released to the atmosphere. .

When the filter element (7a) is clogged with the removal fume, the negative pressure of the clean air space communicating with the blower (8) increases, so that the pressure difference from the atmospheric pressure becomes a predetermined pressure. Is detected by a pressure sensor disposed in the clean air space, a warning means such as an abnormal lamp gives a warning. The warning means such as the abnormal lamp is displayed until the cleaning of the filter element (7a) is completed, and the operation itself of the fume collecting device is not stopped due to the welding operation.

The cleaning of the filter element (7a) is performed while the operation of the blower (8) is stopped, and compressed air of about 0.3 MPa is supplied from the cleaning air injection nozzle (11) to the filter element (7a). Injection into the internal space for 0.5 seconds and stop for 5 seconds are repeated several times so as to be performed intermittently. At this time, the cleaning air that has been jetted increases the flow velocity when passing through the venturi section (10) and flows into the filter element (7a). In addition, the second room
Since the fume inlet side (primary side) divided by the filter element (7) in (3) is maintained at the atmospheric pressure by the decompression damper (12), the pressure between the primary space and the compressed air to be jetted out is reduced. The difference can always be kept constant. The cleaning compressed air that has flowed into the filter element (7a) intermittently acts on the filter element (7a) to vibrate the filter element (7a) to remove attached fumes, and the compressed air that passes through the filter element (7a). The fume adhering to the element (7a) is removed.

When the blower (8) is constituted by a brushless turbo blower capable of changing the number of revolutions as in this embodiment, it is possible to control the air volume accurately, to suppress power consumption especially at a low flow rate, and Reduce the load on the blower motor. And even if a welding torch of a nozzle suction type is used, reliable suction can be performed without generating a blow hole.

[0016]

According to the present invention, the filter is constituted by a cylindrical cartridge type filter, and a venturi forming member is mounted on the communication chamber side of the cartridge type filter with the blower, and the venturi forming member is provided downstream of the suction flow. An air ejection nozzle that intermittently ejects cleaning air toward the Venturi member is arranged, and the space on the fume suction pipe connection side in the casing and the outside of the casing are connected and connected via a negative pressure adjustment valve. By adjusting the pressure by the adjusting valve, the pressure inside the casing does not become higher than a predetermined pressure (atmospheric pressure), and the pressure of the cleaning air to be blown and the pressure inside the casing can be maintained at a constant pressure difference. As a result, a sufficient amount of cleaning air can be supplied.
In addition, since the cleaning air that has been blown out is sent to the inside of the cylindrical filter element at an increased flow velocity in the venturi, the cleaning air that has flowed in over the narrow portion adheres to the filter element due to a pressure change caused by expansion. The separated fume can be reliably separated.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a welding fume collecting apparatus to which the present invention is applied.

[Explanation of symbols]

1 ... casing, 6 ... fume suction pipe, 7 ... filter,
8 blower, 9 blower inlet, 10 venturi member, 11 air ejection nozzle, 12 negative pressure regulating valve.

Claims (2)

[Claims] 1. A filter (7) is mounted inside a casing (1), and the casing (1) partitioned by the filter (7).
One of the internal spaces is connected through a fume suction pipe (6) to the welding and fusing work section and is connected to the casing.
The other space in (1) is connected to the suction port (9) of the blower (8), and the fusing / fusing fume collecting device for sucking and collecting the welding fume generated in the welding / fusing work section includes a filter ( 7) is composed of a cylindrical cartridge type filter, and a venturi forming member (10) is mounted on the side of the cartridge type filter (7) communicating with the blower (8), and the suction flow of the venturi forming member (10) is Venturi member on the downstream side (10)
An air ejection nozzle (11) for intermittently ejecting cleaning air toward the housing is arranged, and a negative pressure regulating valve is provided between the space inside the casing (1) on the fume suction pipe connection side and the outside of the casing.
A welding and fusing fume recovery device characterized by being connected through (12). 2. The welding / fusing fume collecting device according to claim 1, wherein the blower (8) is constituted by a brushless turbo blower capable of changing the rotation speed.