JPS6341077Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a dust collector for removing dust generated from shot blasting equipment and other factory equipment such as foundries.

(Prior art) Conventionally, dust collectors for removing dust generated from foundries, shot blasting equipment, and other factory equipment have been of the cyclone type, which applies a swirling flow to dust-laden air and separates the dust using centrifugal force. Dust collectors are used.

The above-mentioned cyclone type dust collector includes a tangential type cyclone that sucks in dust air from a tangential direction and swirls it, and a cyclone that sucks dust air from a coaxial direction and swirls it as described in JP-A No. 58-64142. A linear cyclone is known that uses generating guide vanes to provide a swirling flow.

By the way, all conventional linear cyclones are installed vertically, and after removing some of the heavy particles from the dust by centrifugation, the entire volume of the remaining air containing relatively light and fine dust is transferred to the cyclone dust collector. However, there was a problem in that it was not possible to obtain sufficient dust collection efficiency.

(Purpose of the invention) The present invention was devised in view of the above-mentioned problems, and aims to provide a dust collector that can obtain sufficient dust collection efficiency, reduce the load on the filter device, and have excellent durability. .

(Structure of the invention) The dust collector of the invention is a linear cyclone whose axis is approximately horizontal, which is coaxially connected to a suction duct that sucks air containing dust, and has guide vanes for generating swirling flow on the suction side. A first suction device is connected to the cyclone via a first suction duct, a pre-stage dust collector is attached to the downstream end of the cyclone, and a second suction device is connected to the pre-stage dust collector via a second suction duct. A suction device is connected, a filter device is interposed in the second suction duct, and the upstream end of the first suction duct faces coaxially with the downstream end of the outer cylinder of the cyclone with an annular gap therebetween. The pre-stage dust collector consists of a separation chamber that communicates with the annular gap and is connected to the second suction duct, a dust collision wall that faces the annular gap in the separation chamber, and a dust extraction path that communicates with the lower part of the separation chamber. It is.

In the above configuration, a larger centrifugal force acts on the dust particles in the swirling airflow inside the cyclone than the centrifugal force acting on the airflow, so the swirling airflow containing dust is The airflow that contains almost no dust (approximately 70% of the total airflow) flows along the annular gap and flows out into the separation chamber.
~75% flows along the central part of the cyclone
It is sucked into the first suction duct by the suction force of the suction device and discharged into the atmosphere.

The dust in the airflow (approximately 25-30% of the total airflow) flowing into the separation chamber from the annular gap at high speed is decelerated inside the separation chamber and stalls when it collides with the dust collision wall, resulting in the formation of relatively heavy dust particles. Most of it will fall under its own weight to the dust extraction section below.

Then, the air containing relatively light and fine dust is sucked from the separation chamber into the second suction duct by the suction force of the second suction device, and is removed by the filter device.

(Effects of the invention) According to the present invention, as explained above, the dust collection efficiency can be increased by the filter device, and the dust collection efficiency is increased by the dust collision wall of the separation chamber, so that the filter Since the load on the device is significantly reduced, the filter device and the second suction device that requires large suction negative pressure can be downsized, and wear of the second suction duct can be improved and its durability can be increased.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. As shown in FIGS. 1 and 2, a linear cyclone 1 is arranged so that its axis is horizontal, and its suction port 2 has a downstream suction duct 4 connected to a hood 3 facing the dust generation area. The ends are coaxially connected, and a pre-stage dust collector 5 is installed on the downstream end side of the cyclone 1.
is attached.

The cyclone 1 has an outer cylinder 7 coaxially disposed outside the inner cone 6, and a plurality of guide vanes 8 for generating a swirling flow are provided between the inner cone 6 and the outer cylinder 7 on the suction side. This guide vane 8 allows the suction duct 4 to
The airflow containing dust that is inhaled from the pipe becomes a swirling flow and flows downstream while swirling.

Further, the upstream end of a first suction duct 9 coaxially faces the downstream end of the outer cylinder 7 of the cyclone 1 with an annular gap 10 therebetween. It is connected to the suction port of a first suction device 11 consisting of a centrifugal blower, and the discharge port of the first suction device 11 is released to the atmosphere via a discharge duct 11a.

The first suction duct 9 and the first suction device 11
The size of the annular gap 10 is appropriately set based on experiments, etc., so that only the air flow containing almost no dust centrifuged in the cyclone 1 is sucked in, but the air is sucked in through the first suction duct 9. It is desirable that the amount of air flowing into the cyclone 1 is approximately 70 to 75% of the amount of air flowing into the cyclone 1.
A low suction negative pressure that does not fall below the suction resistance in the suction duct 9 may be used.

Next, the pre-stage dust collector 5 is constructed as follows.

A casing 12 is connected to the downstream end of the outer cylinder 7 of the cyclone 1, and within the casing 12, a separation chamber 13 having a large vertical diameter and internal volume communicates with the annular gap 10 and surrounds the first suction duct 9. The lower part of the casing 12 is shaped like a hopper, and the dust extraction pipe 14 is connected to the lower end of the casing 12, and a hopper-shaped accommodating part 15 that opens wide at the lower part of the separation chamber 13 and a passage in the dust extraction pipe 14 are connected to the lower end of the casing 12. A dust extraction path is formed. A rubber plate 14a is provided at the lower end of the dust extraction pipe 14, with only the upper end fixed to the dust extraction pipe 14, and when dust accumulates, the rubber plate 14a is pushed and bent by its own weight to allow the dust to fall. .

Furthermore, in order to make it easier to capture the dust that has flowed into the separation chamber 13 from the annular gap 10 by colliding with it and stalling it, a vertical chamber wall portion of the separation chamber 13 facing the annular gap 10 is provided. is formed as a dust impingement wall 16. However, the dust collision wall 16 does not necessarily need to be formed by the wall of the separation chamber, and for example, a rubber plate or the like that easily absorbs kinetic energy may be provided inside the separation chamber 13 so as to face the annular gap 10.

Next, in order to remove dust floating in the air without being captured by the pre-stage dust collector 5, one end of the second suction duct 17 is connected to the upper part of the separation chamber 13. The other end is connected to the suction port of a second suction device 18 consisting of a centrifugal blower, and the second
A filter device 19 for removing dust with a back filter is interposed in the middle of the suction duct 17, and the discharge port of the second suction device 18 is opened to the atmosphere via a discharge duct 18a.

It is desirable that the amount of air sucked in from the second suction duct 17 is about 25 to 30% of the amount of air flowing through the cyclone 1, and the second suction device 18
It is necessary to be able to generate a relatively large suction negative pressure that is greater than the total resistance of the suction resistance of the second suction duct 17 and the suction resistance of the filter device 19.

Note that reference numeral 20 is a collection box for collecting the dust captured by the pre-stage dust collector 5, and reference numeral 21 is a collection box for collecting the dust collected by the filter device 19.

Next, the operation of the above dust collector will be explained.

Since a larger centrifugal force acts on the dust particles in the swirling airflow inside the cyclone 1 than the centrifugal force acting on the airflow, the swirling airflow containing dust flows along the outer cylinder 7 of the cyclone 1 on the outer circumferential side. Air flow that contains almost no dust (approximately 70 to 75% of the total air flow)
flows along the central portion of the cyclone 1, is sucked into the first suction duct 9 by the suction force of the first suction device 11, and is discharged into the atmosphere.

The dust in the air flow (approximately 25 to 30% of the total air flow) flowing into the separation chamber 13 from the annular gap 10 at high speed is decelerated in the separation chamber 13, collides with the dust collision wall 16, and stalls. Most of the heavy dust particles will fall under their own weight into the hopper storage section 15 below.

Then, the air containing relatively light and fine dust is moved from the separation chamber 13 to the second suction device 18 by the suction force of the second suction device 18.
The dust is sucked into the suction duct 17 and removed by the filter device 19.

According to the dust collector of the above embodiment, the load on the filter device 19 can be significantly reduced even with an extremely simple configuration. It can be made smaller, and wear of the second suction duct 17 can be improved to improve durability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram, and FIG. 2 is a sectional view of FIG. 1. 1... Linear cyclone, 4... Suction duct,
5... Pre-stage dust collector, 7... Outer cylinder, 8... Guide vane, 9... First suction duct, 10... Annular gap,
11...first suction device, 13...separation chamber, 14...
...Dust removal pipe, 15...Hopper storage section, 16...
Dust collision wall, 17...Second suction duct, 18...
Second suction device, 19...filter device.

Claims (1)

[Claim for Utility Model Registration] A linear cyclone with a substantially horizontal axis that is coaxially connected to a suction duct that sucks air containing dust and has guide vanes for generating swirling flow on the suction side, and a linear cyclone with a substantially horizontal axis; a first suction device connected by a first suction duct; a pre-stage dust collector attached to the downstream end of the cyclone; a second suction device connected to the pre-stage dust collector by a second suction duct; a filter device interposed in a second suction duct, the upstream end of the first suction duct faces coaxially with the downstream end of the outer cylinder of the cyclone with an annular gap, and is characterized by comprising a separation chamber communicating with the annular gap and connected to the second suction duct, a dust collision wall facing the annular gap in the separation chamber, and a dust extraction passage communicating with the lower part of the separation chamber. Dust collector.