JPS6026569B2 - Sound deadening structure of back pressure washing type dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for collecting dust by removing dust-containing gas from a filter bag, and more specifically, a back-pressure washing type dust collector having a mechanism for cleaning the filter bag by applying high-force gas at appropriate times. The present invention relates to the silencing structure of the device.

The dust collector, which cleans the filter bag by applying reverse pressure from high-force gas, has excellent cleaning effects, and has a simple structure and no moving parts.
Although it has excellent overall performance as a dust collector and has been widely used in recent years, the sound of high-force gas ejecting when the above-mentioned reverse pressure is applied is a noise that cannot be ignored, and depending on the location where it is installed, it may contribute to noise pollution. Therefore, this problem occurs particularly in the case of a dust collector that disturbs the nearby working environment and instantaneously applies reverse pressure.

Therefore, the present invention aims to solve the above-mentioned noise problem by effectively reducing or muffling the ejection sound of the high-force gas by using a noise-reducing structure with a simple structure.Examples of the present invention are shown below. Its configuration will be explained.

In the figure, reference numeral 1 denotes the main body of the dust collector, the interior of which is divided into two by a partition plate 2 into a filter chamber 3 and a clean gas chamber 4, which are communicated to an inlet 5 for dust-containing gas and an outlet 6 for clean gas, respectively.

Reference numeral 7 denotes a filter bag whose lower end is closed and whose upper end is closed and connected to a throat-shaped opening member 8 which is bored and fixed to the partition plate 2.

Reference numeral 9 denotes a high-force gas storage tank connected to other general compressors (not shown), and 10 refers to a solenoid valve (also not shown), which is a general timing device that can arbitrarily set the energization time and the energization interval time. It is something that is regulated.

11 is a pipe connected to the downstream side of the solenoid valve 10;
Reference numeral 2 designates one or more nozzles provided in a portion of the piping 11, and is provided substantially opposite to the center of the entrance of the throat-shaped member 8.

Reference numeral 13 denotes an outer case, one end of which is tightly fixed to the nozzle 12, and the end thereof is opened to form an enlarged opening 14. Reference numeral 15 denotes an inner case, which passes through the nozzle 2 and the enlarged opening 14 and passes through the outer case. A sound absorbing layer 19 made of a sound absorbing material such as glass fiber or rock wool is provided between the outer case 13 and the inner case 15, and the inside of the inner case 15 from the nozzle 12 to the enlarged opening 14 is provided with a sound absorbing layer 19 made of a sound absorbing material such as glass fiber or rock wool. The wall surface is enlarged at an angle of 5 degrees to 0 degrees.

The outer case 13 is made of a gas-impermeable material such as an iron plate or a synthetic resin plate, and the inner case 15 is made of a gas-permeable material such as a wire mesh or a punch plate made of various materials. Reference numeral 16 denotes a fixture, which is used to tightly fix the outer case 13 to the nozzle 12 using screws, and there are other commonly known mounting methods other than those shown in the drawings.

Although not shown inside the filter bag 7,
A gas-permeable holding frame member is provided to maintain its shape. Reference numeral 17 denotes a dust discharge port, which is provided at the bottom of the main body 1, and is connected to a screw conveyor or other type of discharge device (not shown), which discharges foreign particles filtered and collected by the filter bag 7 as dust. be done.

Support legs 18 support the entire main body, and are designed in various forms depending on the installation location of the device.

Further, a windmill (not shown) or a pipe suitable for the windmill is connected to the gas inlet 5 or outlet 6, and the dust-containing gas is introduced into the filter chamber 3. The open cross-sectional shape of the throat-shaped closing member 8 is designed to be circular, rectangular, or elongated slit-like, depending on the shape of the filter bag 7, such as a cylindrical or flat bag. 12 has 1 approximately at the center of their closed cross-sectional shape.
A nozzle or a plurality of nozzles are arranged approximately evenly per unit area, and a slit-shaped nozzle may be applied depending on the cross-sectional shape of the opening. The cross-sectional shapes of the outer case 13, the enlarged row 4, the inner case 15, etc. are also similar to the cross-sectional shape of the nozzle 12, and the feature of the present invention is that regardless of the cross-sectional shape of the opening, An inner case 15 and a sound absorbing layer 19 are closely fixed to the nozzle 12 and have a divergence angle 6 of 5 degrees to 16 degrees.
An outer case 13 having a diameter is provided. In the above embodiment, by sucking or forcing the dust-containing gas into the filter chamber 3 from the inlet 5, the gas flow passes through the filter bag 7 as shown by the arrow, and the throat-shaped opening member 8
The gas enters the clean gas chamber 4 through the outlet 6 and is discharged outside the machine. In addition, the high-force gas stored in the storage tank 9 is jetted out from the nozzle 12 through the piping 11 toward the entrance part of the throat-shaped entrance member 8 by the electromagnetic valve 10 which is activated at a timely manner by the above-mentioned timer. A part of the gas in the filter bag 7 is attracted into the throat-shaped opening village 8 and combines with the high-power gas, thereby imparting a back-pressure cleaning action to the filter bag 7 and removing foreign matter that is brushed off from the outer surface of the filter bag 7. The particles collect at the dust outlet 14 and are taken out of the machine.In addition, when the high-force gas is ejected from the nozzle 12, it makes an explosive ejection sound, but in the present invention, the The outer case 13, the inner case 15, the sound absorbing layer 19, and the enlarged opening 14 can efficiently absorb and attenuate the ejected sound.
When the high-force gas inside is ejected from the nozzle 12, it rapidly expands into an adiabatic cape in response to the pressure, expands at an angle of 5 degrees to 16 degrees, and gradually converts the pressure energy into velocity energy. It becomes a jet stream. On the other hand, the ejection sound generated by the ejection of high-force gas from the nozzle 12 propagates and becomes louder in the range of angles up to 45 degrees from the direction of the ball, especially in the range of 20 degrees to 40 degrees. The range is particularly large.

Therefore, in order to effectively reduce and muffle the above-mentioned explosive jet sound without imposing any restrictions on the divergence angle 0 that the flow has, the flow has a divergence angle 8 similar to that of the jet area. The sound absorbing layer 19 is disposed to surround the jet, thereby absorbing and attenuating the wave motion of the jet sound outside the range of the jet area, thereby significantly reducing the generation of the jet sound. Furthermore, by attaching a sound absorbing layer 19 held by the outer case 13 and inner case 15 to the tip of the nozzle 12, sound absorption, interference and attenuation are achieved at the location where the ejected sound is generated, and resonance due to the plurality of nozzles 12 is prevented. Since a synergistic effect can be imparted by the above, it is possible to effectively reduce the ejection sound and obtain an efficient silencing effect. Therefore, the present invention can also be used as a muffling mechanism for general engines that use propulsion force to efficiently convert the energy of pressurized gas into velocity energy, and in particular can suppress high-frequency components generated near the nozzle. It is extremely effective against jet noise. Although not shown, the effect can be further improved by disposing a sound absorbing material similar to that described above on the entire inner wall surface of the clean gas chamber 4 in FIG. If measures are taken to prevent the fibers constituting the sound absorbing material from falling off using a membrane or the like, or if these foreign substances are allowed to be mixed into the dust, the present invention will still work even if the sound absorbing material is provided on the entire inner surface of the main body 1. Further effects are expected.

As described in detail above, according to the present invention, extremely efficient sound reduction or noise reduction effect can be obtained by using a simple noise reduction structure without causing any hindrance to the operational performance of the dust collector.

Further, according to the present invention, it is possible to easily add equipment to an existing dust collection device of this type, and the present invention is industrially useful as it is highly economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of main parts showing an embodiment of the present invention, and FIG.
The figure is an enlarged view of part A in Figure 1, and Figure 3 is an enlarged view of part A in Figure 2.
-B is a sectional view. In the figure, 1... Main body, 4... Clean gas chamber, 5... Inlet, 6... Outlet, 7... Filter bag, 8... Throat-shaped entrance member, 12 ... Nozzle, 13 ... Outer case, 14 ... Expansion port, 15 ... Inner case, 17 ... Dust discharge port, 19 ... Sound absorption layer,
8...This is the divergence angle. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A filter bag 7 is provided in the main body 1 having a gas outlet 6, an inlet 5, and a dust outlet 17, and the outside of the filter bag 7 communicates with the inlet 5 and the dust outlet 14, Inside the filter bag 7 is a throat-shaped opening member 8;
It communicates with the outlet 6 through the clean gas chamber 4, faces the opening of the throat-shaped opening member 8, and is used to blow out high-force gas at a proper time from the downstream side of the normal gas flow to the upstream side. In a back pressure washing type gas filtration device equipped with a nozzle 12, the nozzle 12 is attached to an outer case 13 made of a gas-impermeable material, which is tightly fixed to the nozzle 12 at one end and opened at the other end to form an enlarged opening 14. and an inner case 15 made of a gas-permeable material that communicates with the enlarged opening 14 is provided, and a sound-absorbing material is made of a sound-absorbing material between the outer case 13 and the inner case 15. A back pressure washing type dust collector characterized in that a sound absorbing layer 19 is provided and the inner wall surface of the inner case 15 from the nozzle 12 to the enlarged opening 14 has a spread angle θ of 5 degrees to 16 degrees. Sound deadening structure.