JP2595154B2 - Bag filter dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter dust collecting apparatus, and more particularly to a bag filter dust collecting apparatus having a dust removing mechanism using pulse air.

[0002]

2. Description of the Related Art Conventionally, as a dust removing measure or a powder collecting means for maintaining a good working environment, a bag filter dust collecting apparatus of a pulse air sweeping-off type has been adopted in various fields of the industrial world. This means that while a filter cloth formed in a bag shape is vertically installed to capture dust in the passing air, high-pressure compressed air is instantaneously discharged as pulsed air to the clogged filter cloth, It is intended to maintain the dust collection performance by removing captured dust. At this time, since the pulse air is discharged from the nozzle at a speed close to the speed of sound, a high-frequency sound of 2000 to 4000 Hz (hereinafter referred to as “pulse sound”) is generated. However, in recent years, as the size of the dust collector has increased, the pulse valve for generating pulse air has also been used with a large diameter, so the pulse noise has also increased and the noise environment around the dust collector has increased. Is getting worse. Therefore, noise reduction is achieved by surrounding the entire dust collecting device with a soundproofing material.

[0003]

However, in the above-mentioned soundproofing measures, it is difficult to obtain a soundproofing effect at low cost because the mounting area of the soundproofing material is enormous, and the material cost and the construction cost are large. Moreover, soundproofing of the exhaust is difficult and imperfect. Therefore, in the present invention, while maintaining the dust removal performance, by reducing the pulse sound generated from the nozzle at the time of pulse air discharge,
It is a technical problem to be solved to obtain a noise reduction effect reliably at low cost.

[0004]

A technical means for solving the above problem is to configure a bag filter dust collecting device as follows. That is, a diameter of 130 to 200
The filter cloth formed in a bag shape having a length of 6 to 7 m is suspended vertically to capture dust in the passing air, and the inside of the filter cloth is formed through a tubular nozzle provided in a blow tube having a pulse valve. In a bag filter dust collector configured to blow off dust adhering to the filter cloth by discharging pulse air, a pipe member is vertically provided at a position concentric with a hole provided in the blow tube. At the same time, the nozzle is formed by providing a perforated plate having a plurality of holes having a hole diameter of 5 to 15 mm at the distal end portion of the tube member, and the nozzle is formed.
Product S1 and area S2 of a hole provided in the blow tube.
Is a ratio S1 / S2 of 0.7 to 2.0.
You .

[0005]

According to the present invention, in a bag filter dust collecting apparatus, a pipe member is vertically provided at a position concentric with a hole provided in a blow tube, and a hole diameter of the pipe member is 5 to 15 m.
forming a nozzle by providing a perforated plate having a plurality of holes of m.
The total area S1 of the perforated plate and the blow
The ratio S1 / S2 to the area S2 of the hole provided in the
Since it is 2.0, it is possible to reduce the pulse sound generated at the time of discharging the pulse air while maintaining the dust removing performance, as shown in the experimental results described later.

[0006]

EXAMPLES described below with reference actual施例of the present invention with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of the bag filter dust collecting apparatus. In the case 1 constituting the ventilation duct, a large number of bag-shaped filter cloths 2 are vertically provided in the cross section of the ventilation path, and air blown by a blower or the like (not shown) passes through the filter cloths 2. At this time, dust in the air can be captured by the outer wall of the filter cloth 2. The filter cloth 2 is a non-woven cloth made of short fibers such as polyester, and has a diameter of 130 to 200 m when used for a large bag filter dust collector.
m and a length of 6 to 7 m. Further, a pulse air discharge mechanism 3 is provided above the filter cloth 2 for appropriately removing dust adhering to the filter cloth 2.

FIG. 2 is a perspective view showing the pulse air discharge mechanism 3, and FIG. 3 is a sectional view taken along the line AA in FIG. In both figures, a required number of cylindrical blow tubes 5 made of metal or synthetic resin are attached to a header tube 4 connected to a high-pressure compressed air source (not shown). The header pipe 4 is further provided with a pulse valve 6 having a diaphragm 6a for discharging the high-pressure compressed air instantaneously (about 0.1 second) as pulse air for each blow tube 5, and the pulse air is blown. It is configured so that it can be supplied into the tube 5. The other end of the blow tube 5 extends in the direction perpendicular to the axis from the header tube 4, and has a predetermined pitch in the longitudinal direction, that is, nozzles 7 to 7 are provided at positions that can face the opening 2 a of the filter cloth 2. I have. The nozzle 7 has a cylindrical pipe (also referred to as a pipe member) at a position concentric with a hole 5 a formed in the blow tube 5.
As shown in FIG. 4, a perforated disk 7b is attached to the tip of the pipe 7a. Perforated disk 7b
As shown in FIG. 5, a plurality of small holes 7c are drilled, the diameter of the small holes 7c is 5 to 15 mm, and the ratio S of the total opening area S1 of the plurality of small holes 7c to the area S2 of the hole 5a.
1 / S2 is in the range of 0.7 to 2.0. The shape of the perforated disk 7b is not limited to the present embodiment, and the small hole 7c may be formed in a shape other than a circle, for example, a small hole 7d having a shape as shown in FIG. ,
It is also possible to change the arrangement. Further, the perforated disk 7b is not limited to a flat plate, but may be formed to have a curved surface.

Next, the operation of the pulse air discharge mechanism 3 based on the above configuration will be described. The high-pressure compressed air supplied to the header tube 4 becomes pulsed air by the action of a pulse valve 6 operated by an external signal , is transmitted to the nozzle 7 through the blow tube 5, and is discharged from the tip. The pulse air is transmitted from the opening 2a which is disposed below the straight nozzle 7 in the interior of the filter cloth 2, blowing through the filter cloth 2 with vibrating the filter cloth 2, the dust adhering to the filter cloth 2 Can be paid off. At this time,
From the result of the comparative experiment with the nozzle of the conventional example,
Since the dust filter has an optimal shape capable of reducing the pulse sound generated at the time of discharging the pulse air while maintaining the dust removing performance by the pulse air, the noise of the bag filter dust collecting device can be reduced.

Next, a description will be given of performance confirmation experiments when the following two types of nozzles according to the present embodiment and the conventional example are mounted. 4 and 5 according to an embodiment of the prior SL nozzle 7
(P-type nozzle) shape, inner diameter D1 is 41.6 m
m, the length L1 is 100 mm, and the above-mentioned perforated plate 7b is attached to the tip. FIG. 7 shows the shape of a conventional nozzle 9 according to a conventional example, and the inside diameter D3 is 35.7 m.
m, length L3 is 50 mm, and hole 5c is formed smaller than inner diameter D3.

As shown in FIG. 8 , the experimental apparatus has the same configuration as that of the above-described embodiment. A pulse valve 6 and a blow tube 5 are provided in a header pipe 4 connected to a high-pressure compressed air source (not shown). One of the nozzles 7 and 9 is attached at a predetermined pitch in the longitudinal direction to the blow tube 5 extending in the direction perpendicular to the axis from the header tube 4 and pulse air is passed through the filter cloth 2. Is configured to be able to be ejected into the inside. The air pressure in the header pipe 4 was 2.2.
At kgf / cm ² , the operation time of the pulse valve 6 is set to 0.1 sec per time, and the pulse air discharge amount can be measured. In addition, a pressure sensor is provided on the filter cloth 2 vertically provided below the nozzles 7 and 9 , and the pressure sensor is connected to a recorder through a pressure gauge. Pressure can be measured. Further, a sound level meter for measuring a pulse sound is provided at a position 1 m away from the machine side of the experimental apparatus.

FIGS. 9 and 10 are diagrams showing the results of the experiment. FIG. 9 is a frequency analysis of a pulse sound generated when the conventional nozzle 9 is used. At this time, the noise level near the nozzle was 128 dB (A). In addition, FIG. 10
Is a frequency analysis of the pulse noise generated when using nozzle 7 according to the present embodiment (P-type nozzles), this time, noise level at the nozzle vicinity Ah <br/> at 1 15 dB (A) Was. Therefore, a reduction of about 13 dB (A) is achieved as compared with the conventional example. Incidentally, from the frequency analysis results shown in these figures,
At the noise level measured at a position 1 m away from the bag filter dust collector, the transmission loss of the filter cloth 2 and the case 1 is added, so that the noise level is about 100 dB when the conventional nozzle 9 is used.
In contrast to (A), when the nozzle 7 according to the present embodiment was used, the noise level could be reduced to about 85 dB (A) or less, and the noise value could be guaranteed. In addition, a better result was obtained with respect to dust removal performance than the conventional nozzle. This is due to the fact that the pulse air exerted around the filter cloth due to the difference in the nozzle structure was strengthened.

[0012]

As described above, according to the present invention , a pipe member having an inner diameter substantially the same as the diameter of the hole is vertically provided at a position concentric with the hole provided in the blow tube, and the hole diameter is formed at the tip of the pipe member.
A perforated plate having a plurality of holes of 5 to 15 mm is provided and a nozzle is provided.
And the total hole area S1 of the perforated plate and the blow
The ratio S1 / S2 to the area S2 of the hole provided in the tube is set to 0.
7 to 2.0, the diameter is 130 to 200 mm
Bag filter having filter cloth formed in a bag shape having a length of 6 to 7 m
In the filter dust collector, since the pulse noise generated at the time of the pulse air discharge can be reduced while maintaining the dust removing performance, there is an effect that the noise reduction effect can be obtained reliably and inexpensively .

[Brief description of the drawings]

1 is a cross-sectional view showing a bag filter dust collector according to the actual施例of the present invention.

2 is a perspective view showing a pulse air discharge mechanism according to the actual施例of the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

It is a sectional view showing a nozzle according to the actual施例of the present invention; FIG.

FIG. 5 is a BB view of FIG. 4;

FIG. 6 is a plan view showing a perforated disk according to another embodiment.

FIG. 7 is a sectional view showing a nozzle according to a conventional example.

FIG. 8 is a diagram illustrating an experimental apparatus.

FIG. 9 is a diagram showing a frequency analysis of an experimental result.

FIG. 10 is a diagram showing a frequency analysis of an experimental result.

[Explanation of symbols]

2 cloth 3 pulse air discharging mechanism 4 header tubes 5 blow tube 6 pulse valve 7, 9 nozzles 7 a pipe 7b perforated disc

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiroshi Koide 6-1, Nanyo-dori, Minami-ku, Nagoya-shi, Aichi Tokai Plant Engineering Co., Ltd. (56) References JP-A-51-44376 (JP, A) Shokai Sho 54-43677 (JP, U) Shokai Hei 1-25312 (JP, U) JP 2-48074 (JP, B2) JP-B 60-33544 (JP, B2) JP-B 60-2489 (JP, B2) Jiko 63-44093 (JP, Y2)

Claims (1)

(57) [Claims] 1. A diameter of 130 to 200 mm and a length of 6 to 7 m
A filter cloth formed in the shape of a bag is vertically installed to catch dust in the passing air, and pulse air is discharged into the filter cloth through a tubular nozzle provided in a blow tube having a pulse valve. Thus, in a bag filter dust collecting device configured to remove dust adhering to the filter cloth, a pipe member is vertically provided at a position concentric with a hole provided in the blow tube, and a tip end of the tube member is provided. Hole diameter
The nozzle is formed by providing a perforated plate having a plurality of holes each having a diameter of 5 to 15 mm.
-The ratio S1 / S2 to the area S2 of the hole provided in the tube is
A bag filter dust collecting device having a ratio of 0.7 to 2.0 .