JP2009202103A - Explosion-proof filter for dust collector and explosion-proof dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an explosion-proof filter and a dust collector capable of safely realizing back washing operation which avoids the increase of pressure loss by accumulation of dust while being devised so as not to cause propagation of catching fire to and, heating of, fine dust which makes the start of ignition and so as not to lead to dust explosion. <P>SOLUTION: Dust is collected in the inside of a filter medium 2 by installing the explosion-proof filter 1 which is formed by arranging a porous metal body 5 having three-dimensional pore parts 5A in the inside of the filter medium 2 in the inside of an explosion-proof dust collector 10 and by circulating the air containing dust from the inside of the filter medium 2 toward the outside by the suction force of a blower 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of dust collectors that collect highly ignitable dust and chips generated when machining materials such as titanium, magnesium, and aluminum. Specifically, The present invention relates to an explosion-proof filter for a dust collector and an explosion-proof dust collector designed to eliminate the danger of dust explosion caused by dust and chips.

  Regarding explosion-proof dust collectors and filters, there are a “dust collector having a fire countermeasure function” disclosed in Patent Document 1 disclosed by the present applicant and a “dust collector” described in Patent Document 2.

  In Patent Document 1, the thermal particles having a large mass and high thermal energy, which have been centrifuged by the pre-dust separator, are absorbed by heat treatment before being recovered in the dust bucket, and the high thermal energy is lost and discharged to the dust bucket as low energy particles. Thus, a dust collector equipped with a fire countermeasure function devised to prevent ignition is disclosed.

In Patent Document 2, coarse particles that generate large thermal energy that accompanies an explosion when ignited are collected by a mesh filter, quickly dropped by air backwashing and discharged to the outside, and the like. A certain amount of fine dust is reduced to an amount that does not ignite by reducing the amount attached to the filter as much as possible, and inert gas is used everywhere to prevent ignition even if sparks are generated due to static electricity. A technique for reducing the risk of inducing a dust explosion is disclosed.
JP 2001-062220 A JP 2002-263425 A

  In this way, when an easily ignited material is processed and the chips are collected, a dust explosion may occur. The mechanism of the explosion is that the collected dust is used to reduce filter pressure loss. By dusting off, it begins to float as a dust cloud in the dust collection chamber, and fine dust particles are ignited in the dust collection chamber due to some kind of trigger (such as static electricity or a fire type during welding work). It is thought that other fine dust particles are heated and ignited, and that the explosion is attracted by successive propagation of the ignition.

  However, in Patent Document 1, since fine dust is collected by a dust removal method such as air injection, the fine dust floats in the dust collection chamber and becomes a dust cloud, which increases the possibility of ignition. . Therefore, in the above-mentioned Patent Document 2, the fine dust collecting filter has a structure in which dust is adhered to the outside without backwashing, but in this structure, the frequency of replacement of the filter is high. Since the operation is frequently stopped due to the replacement work, a process of separately cleaning the accumulated dust is necessary for replacement or reuse of the filter itself, and there is a problem that the running cost of the dust collection operation increases.

  Therefore, the technical problem of the present invention is that even if a fire type that triggers an explosion is ignited in the dust cloud state generated by dusting in the dust collection chamber, it does not cause the propagation of heating and ignition to the surroundings. In addition, an explosion-proof filter for dust collectors and an explosion-proof filter that has been devised not to cause a dust explosion, and in addition, can be used to safely remove the accumulated dust (back washing operation) to avoid an increase in pressure loss due to dust accumulation. Is to provide a type dust collector.

(1) In order to solve the above technical problem, an explosion-proof filter for a dust collector according to claim 1 of the present invention is for dust collection used in a dust collector that collects dust such as highly ignitable dust and chips. A porous body having a three-dimensional pore that is composed of a solid substance whose entire thermal conductivity is higher than that of air and has a continuous skeleton in a three-dimensional manner. It is characterized by being arranged so as to be in contact with the intake side.

(2) Moreover, the explosion-proof filter for dust collectors according to claim 2 of the present invention is characterized in that the entire porous body is made of metal or ceramics.

(3) Further, in the explosion-proof filter for dust collector according to claim 3 of the present invention, the entire filter medium is formed in a vertically open cylindrical body having a circular cross section or a polygonal shape, It is characterized by being filled with a porous body and configured to collect the dust inside the filter medium by circulating dust-containing air from the inside to the outside of the filter medium.

(4) Furthermore, an explosion-proof dust collector according to claim 4 of the present invention is an explosion-proof dust collector that collects dust, such as highly ignitable dust and chips, using a filter having an explosion-proof function, A filter medium in which a filter is made of a solid material having a higher thermal conductivity than air, and a porous body having three-dimensional pores whose skeletons are continuous in three dimensions and formed into a cylindrical shape with an upper and lower opening type. It is constructed in an explosion-proof type so as to be in contact with the inside of the filter, and the dust-containing air is circulated from the inside to the outside of the filter medium by the suction force of the blower. It is characterized by being configured to collect.

(5) Further, the explosion-proof dust collector according to claim 5 of the present invention is arranged with a plurality of explosion-proof filters formed by arranging the porous body inside the filter medium in a standing state in a dust collection chamber. On the upper surface side of these multiple explosion-proof filters, a movable lid that can be selectively closed while rotating the upper surface opening of each explosion-proof filter is provided so that the explosion-proof filter can be closed from the outside to the inside. Explosion-proof so that when the dust is blown away, the drive means rotates the movable lid so that the dust collected inside the filter medium by the backwash air does not rescatter to the intake side. The upper surface opening of the mold filter is selectively closed.

(6) Further, an explosion-proof dust collector according to claim 6 of the present invention provides a cylindrical cover body formed concentrically with respect to each of the plurality of explosion-proof filters, and an outer periphery of the explosion-proof filter. The backwash air for dust removal is configured to be blown out toward the gap between each of the explosion-proof filters and the cover body, and the dust is placed on the movable lid body. A lid plate portion that closes the upper surface opening of the explosion-proof filter at the time of wiping off is provided, and a vent hole that allows the backwash air to be blown in is provided around the lid plate portion. It is said.

(7) In addition, an explosion-proof dust collector according to claim 6 of the present invention includes a plurality of explosion-proof filters each having a plurality of explosion-proof filters enclosed in the dust collection chamber. The inner cylinder having an exhaust passage that is arranged side by side with the cover body and communicated with an external blower, and is disposed concentrically on the outer side of the inner cylinder, and is arranged in the outer circumferential tangential direction. And an inner cylindrical body and a dust bucket provided on the lower side of the outer cylindrical body, and the blower sucked into the outer cylindrical body through the intake passage by the suction action. The dust-containing air is raised by forming a swirl flow in the interval passage between the inner cylinder and the outer cylinder, and then flows into the filter through the upper surface port of the explosion-proof filter to be filtered. Through the gap between the explosion-proof filter and the cover body And sucked into the exhaust path from the serial inner cover is characterized by evacuating the outside of the dust collecting chamber.

  According to the explosion-proof filter for dust collector and the explosion-proof dust collector described in (1) and (4) above, even if fine dust becomes a dust cloud during the dust-off (backwash) operation after the dust collection operation, the filter medium Dust clouds are generated inside the dust collection chamber other than the inside of the porous body by being stored inside the porous body and falling inside the porous body without being re-scattered upstream (intake side) and gathering downward. Therefore, even if the fine dust inside the porous body is heated and ignited, it is absorbed by the porous body with high thermal conductivity and the propagation of the ignition does not occur and the dust explosion does not occur, so titanium, magnesium, aluminum, etc. Even in a dust collector that collects highly ignitable dust or chips generated when machining a material, it is possible to safely perform the removal operation.

  According to the explosion-proof filter for a dust collector described in (2) above, a porous body having an arbitrary porosity and a thermal conductivity several tens of times that of air can be easily manufactured from an arbitrary porosity by an ordinary manufacturing method. Therefore, the function (1) can be realized reliably and inexpensively.

  According to the explosion-proof filter for a dust collector described in (3) above, the filter medium can be arranged in parallel, so that a plurality of filters can be arranged in parallel, and the dust collection ability can be improved. It is easy to fill the interior space of the filter with a porous material. In addition, the position of the movable lid can be selected and the dust collection operation and the removal operation can be performed at the same time, so the pressure loss due to the removal operation during continuous operation can be reduced. It becomes.

  According to the explosion-proof dust collector described in the above (5) and (6), the air pressure during the backwashing operation is efficiently applied to the cylindrical filter, and the dust on the filter is wiped off by the flushing (backwashing) operation. Ability can be improved.

  According to the explosion-proof dust collector described in (7) above, after collecting and collecting a large amount of dust in the cyclone-type primary dust collector, only fine dust flows into a plurality of explosion-proof filters provided on the secondary side. As a result, the dust collection efficiency is improved and the filter clogging can be reduced.

  As described above, according to the explosion-proof filter for dust collector and the explosion-proof dust collector according to the present invention, highly ignitable dust and chips generated when machining a material such as titanium, magnesium, or aluminum are used. When collecting dust, the risk of dust explosion caused by these dusts and chips can be surely eliminated, and the filter pressure loss is reduced by the removal operation (back washing operation) during continuous dust collection operation. The advantage that an explosion-proof filter and an explosion-proof dust collector capable of realizing the above can be realized can be exhibited.

  The embodiment of the above-described explosion-proof dust collection filter and dust collector according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the appearance of the explosion-proof dust collection filter according to the present invention and the exploded view of the filter unit. 2 is a sectional view of the explosion-proof dust collection filter according to the present invention, FIG. 3 is an enlarged view of a porous metal body used in the explosion-proof dust collection filter according to the present invention, and FIG. 4 is used in the explosion-proof dust collection filter according to the present invention. FIG. 5 is a structural diagram of an explosion-proof dust collector according to the present invention, FIG. 6 is an exploded view of a dust collection unit portion of the explosion-proof dust collector according to the present invention, and FIG. 7 is an explosion-proof type according to the present invention. FIG. 8 is a detailed view of the main part of the dust collector, FIG. 8 is a detailed view of the main part at the time of the removal (back washing) operation, and FIG. 9 is an explanatory view of the operation of the explosion-proof dust collection filter according to the present invention. These embodiments are preferred specific examples of the present invention, and may have various technically preferable limitations, but the technical scope of the present invention does not particularly limit the present invention. However, the present invention is not limited to these embodiments.

  In FIG. 1, reference numeral 1 generally indicates an explosion-proof filter for a dust collector according to the present invention. The explosion-proof filter 1 includes a filter medium 2 formed in a cylindrical shape, and an opening of the filter medium 2. The upper and lower flanges 3A and 3B that are attached to the upper and lower ends are formed in an open state, the metal flange-like reinforcing body 4 that suppresses the buckling and swelling of the filter medium 2, and the filter medium 2 The round holes of the upper and lower flange bodies 3A and 3B, which are constituted by a plurality of cylindrical metal porous bodies 5 accommodated in a plurality of stages and are widely opened, serve as the upper surface opening 2X and the bottom surface opening 2Y of the explosion-proof filter 1. It is composed.

  Specifically, the filter medium 2 is obtained by cutting a filter medium formed of a metal or ceramic having high heat resistance into a woven cloth shape into a rectangular shape and winding it into a cylindrical shape and joining them up and down. The attached flange bodies 3A and 3B are configured to maintain this cylindrical shape.

  FIG. 2 shows a cross-sectional view of the explosion-proof filter 1, and the porous metal body 5 is tightly accommodated inside the filter medium 2 as shown in the figure, with the inner surface of the filter medium 2 in contact with the peripheral surface. The upper and lower flange bodies 3A and 3B are configured so as to suppress the metal porous bodies 5 and the metal porous bodies 5 and the filter medium 2 in close contact with each other.

  FIG. 3 is an enlarged view showing a part of the porous metal body 5 used in the explosion-proof filter 1 according to the present invention. As shown in the figure, the porous metal body 5 has an infinite number of pores 5A of about 3 mm. In other words, it has a high porosity, ie, a specific surface area (ratio of surface area to volume). It is used, and can be easily obtained even by custom manufacturing with a desired pore shape, porosity, external shape, material, and the like.

  FIG. 4 is an explanatory view showing an example of the porous metal body 5 used in the explosion-proof filter 1 according to the present invention, which explains the relation between a part of the manufacturing method and the structure, and in the embodiment of the present invention. In the manufacturing process, the metal porous body 5 to be used is filled with resin beads having a corresponding diameter in order to obtain desired pores, molded into a metal, and after forming a composite of metal and resin beads, only the resin beads are formed. It assumes a manufacturing method such as melting and removing. Ideally, the spherical shapes of the resin beads before removal are aligned as shown in FIG. 4 and the space is filled with metal only, and innumerable three-dimensional spaces are formed inside. In practice, however, the porous metal body has a moderately complicated three-dimensional space as shown in FIG. 3 due to variations in the diameter of the resin beads filled in the inside and deformation during close contact. In recent years, such a member can be easily manufactured from various materials.

  Since the porous metal body 5 has such a structure, it can be deformed or compressed with a relatively small force from the outside, and the inside of the filter medium 2 as shown in FIGS. And it is easy to make metal porous body 5 ... adhere closely. In addition, the metal porous body 5 obtained by a manufacturing method other than the above, the one obtained by condensing a metallic non-woven fabric, the one wrapped with a wire net-like one, or the one like a metal scourer called steel wool is also included in the present invention. The filter medium 2 can be manufactured in one piece, not in multiple stages, and can be manufactured as a single unit. The porous body having a three-dimensional pore formed by using a solid substance higher than air and having a three-dimensional continuous skeleton is not limited to the above-described manufacturing method and size.

  FIG. 5 shows a configuration diagram of an explosion-proof dust collector according to the present invention generally indicated by reference numeral 10, and the explosion-proof dust collector 10 includes a dust collection unit indicated by reference numeral 11, a blower 20 including a blower motor 20M, They are composed of ducts 22 that communicate with each other and the outside, and an exhaust duct 21 for the blower 20.

  As seen in the exploded perspective views of FIG. 5 and FIG. 6, the dust collection unit 11 has a cylindrical outer cylinder 12 in which the intake passage 12A communicates from the external tangential direction, and an internal dust collection chamber. 12K, and the inner cylinder 13 having a bottom plate 13R which is concentrically fitted to the outer cylinder 12 and partially communicates with the exhaust passage 13A to the blower 20. On the upper surface portion, an upper cover 14 having a plurality of openings 14A and a disk 15 as a movable lid, which will be described later, are arranged in a state of overlapping vertically.

  In addition, in the inside 13K of the inner cylindrical body 13, the plurality of explosion-proof filters 1 in a state where the upper surface openings 2X are in communication with the plurality of openings 14A in the upper cover 14, respectively. A filter cover 16 is formed on the outer periphery of each of the explosion-proof filters 1... With a height slightly lower than that of the filter 1 and provided with a taper 16T for air intake at the upper end opening. They are arranged at intervals.

  Further, a dust bucket 17 for dust collection is detachably mounted on the lower side of the outer cylinder 12 and the inner cylinder 13 as shown in FIG. 5, and the plurality of explosion-proof filters 1. The bottom opening 2Y at each lower end communicates with the dust bucket 17 through a plurality of vent holes 13H opened in the bottom plate 13R of the inner cylinder 13 respectively.

  The upper surface of the outer cylinder 12 is covered with an upper lid 18, and a disk motor 15 M is attached to the upper side of the upper cylinder 18, and the lower end portion of the drive shaft 15 S through which the disk 15 penetrates the upper lid 18. In addition, a compressed air purge header 19 is also arranged, and the compressor 19 communicating with the header 19 is omitted in the drawing. The air hose is connected to the air compressor.

  Although the details will be described later, the explosion-proof dust collector according to the present invention basically sucks dust-containing air from the intake passage 12A on the outer periphery provided in the outer cylinder 12 by the suction action of the blower 20 described above. Since the dust-containing air enters the interval SP (see FIGS. 7 and 8) between the outer cylindrical body 12 and the inner cylindrical body 13 and rotates and rises along the inner wall of the outer cylindrical body 12, this interval SP is a cyclone type. A primary dust collection chamber 12W is formed, and in this primary dust collection chamber 12W, relatively coarse dust BD is collected by falling into the dust bucket 17 by its own weight while rotating along the inner wall of the outer cylindrical body 12 by centrifugal force. Is done. On the other hand, the relatively fine dust SD passes from the opening 14A of the upper cover 14 provided on the upper surface of the outer cylinder 12 to the secondary dust collection chamber inside the inner cylinder 13, that is, the interior of each explosion-proof filter 1. And is collected on the inner wall of the filter medium 2, and clean air that does not contain fine dust is sucked into the blower 20 from the exhaust passage 13 </ b> A of the inner cylinder 13 and passes through the exhaust duct 21 to the outside of the dust collector 10. The system is exhausted.

  FIG. 6 is an exploded view showing a part that performs the primary dust collection and secondary dust collection operations described above as the dust collection unit 11 in particular, and is not shown in FIG. As shown in FIGS. 7 and 8, in each of the openings 14 </ b> A, fitting recesses 14 </ b> S surrounding the opening 14 </ b> A are formed upward, and these fitting recesses 14 </ b> S are circular. The blow tube 30 ... which injects the compressed air for dust removal formed in the shape is inserted.

  Each of the blow tubes 30 is branched from the compressed air purge header 19 shown in FIGS. 5, 7, and 8 and communicates via individual valve devices. Further, a disk 15 as the movable lid is disposed between the blow tubes 30 and the explosion-proof filters 1. The circular plate 15 is provided with round holes 15A having the same diameter as the upper surface ports 2X of the filters 1 in a total of three positions, and only one position is a blocking portion 15S having the same diameter as the upper surface port 2X. It is possible to blow the dust-decompressed compressed air sprayed from the blow tube 30 around the closed portion 15S between the explosion-proof filter 1 and the tapered portion 16T at the upper end of the filter cover 16. Opening portions 15X are provided.

  The plurality of explosion-proof filters 1 are accommodated coaxially with the vent holes 13H provided in the bottom plate 13R of the inner cylinder 13, and the above-described filter covers 16 are disposed on the outer periphery thereof.

  FIG. 7 is a detailed view of the main part of the explosion-proof dust collector according to the present invention. The operation during normal dust collection operation will be described. Dust-containing air passes through the dust collection unit 11 through the path shown by the thick line in the figure. As described with reference to FIG. 5, first, dust-containing air is sucked from the intake passage 12 </ b> A on the outer periphery of the outer cylinder 12, and the dust-containing air rotates and rises along the inner wall of the outer cylinder 12. In this primary dust collecting chamber 12W, relatively coarse dust BD (large dust particles) falls along with the inner wall of the outer cylindrical body 12 by centrifugal force and falls into the dust bucket 17 by its own weight. It is collected. Relatively fine dust SD (small dust particles) is collected in the secondary dust collection chamber inside the inner cylinder 13, that is, the explosion-proof filter 1 from each opening 14 </ b> A provided in the upper cover 14 at the upper part of the outer cylinder 12. , And is sucked through the inside of the porous metal body 5 inside each explosion-proof filter 1, so that it is collected on the inner wall of the filter medium 2, and clean air not containing fine dust is contained inside. The air is drawn into the blower 20 through the exhaust passage 13A of the cylinder 13 and exhausted to the outside of the dust collector 10.

  At this time, the disc 15 is stopped in a state where the opening 15A is coaxially connected to the upper opening 2X of the explosion-proof filter 1 and the opening 14A of the upper cover 14, and the disc motor 15M is also stopped. However, a position sensor or switch for accurately determining this position is separately provided, and the disk motor 15M is accurately stopped from driving by the input, or a pulsed air jet from the blow tube 30 is detected. A control unit that determines the timing is mounted inside the dust collector 10 (not shown).

  While normal dust collection operation is continued in this state, when the dust particles SD collected on the inner wall side of the filter medium 2 gradually accumulate and clog the explosion-proof filter 1, suction of the blower 20 is performed. The efficiency of the action deteriorates. For this reason, this type of filter type dust collector applies a mechanical vibration to the filter, or pulse air is applied to the filter to remove the accumulated small dust particles. It is a common practice to do this occasionally.

  If the small dust particles that are wiped off during the removal (backwashing) operation fill the primary dust collection chamber 12W or the interior 13K of the inner cylinder 13 as a “dust cloud”, the fire type is caused by the dust cloud. By igniting, the dust particles in the dust cloud are heated and ignited one after another, and there is a risk of causing a dust explosion.

  Therefore, the improvement effect of the present invention will be described with reference to a detailed view of the main part shown in FIG. 8. First, before the operation of back-off (backwashing), the upper surface 2X of the explosion-proof filter 1 that performs the back-off is closed. When the disk 15 as a movable lid is rotated by the plate motor 15M and stopped at the position where the closing portion 15S accurately closes the filter upper surface port 2X, the outlet of the blow tube 30 is exactly the explosion-proof filter 1. In an open state so that pulsed air can be ejected toward the inner periphery of the filter cover 16. In this state, as shown in FIG. 8, pulsed air is ejected and a sudden pressure is applied in a pulsed manner from the outside to the inside of the explosion-proof filter 1, thereby collecting small dust collected and accumulated on the inner wall of the filter medium 2. The particles SD are washed off from the inner wall of the filter medium 2 and float in the pores 5A inside the porous metal body 5 in a dust cloud state.

  If ignition and explosion do not occur in the small dust particles SD suspended in the pores 5A inside the metal porous body 5, the dust particles gradually settle by their own weight or accumulate in the pores 5A inside the metal porous body 5. However, since the pressure and vibration caused by wiping off (back washing) also acts on the dust accumulated in the pores 5A inside the porous metal body 5, the density of the floating dust gradually becomes dense. Then, it settles below the metal porous body 5 and finally falls to the dust bucket 17 below it.

  Accordingly, in the pore portion 5A inside the metal porous body 5 inside the filter, the dust that floats and accumulates becomes larger and denser as it goes down, and if it falls to the dust bucket 17, it becomes already a dust cloud. In this state, relatively small dust particles harden and their own weight increases and falls, and at this time, there is little risk of dust explosion even if ignited.

  In a dust cloud-shaped dust collection chamber, dust explosions ignite and burn when individual dust particles ignite when there is a space between individual dust particles and the surroundings of each dust are filled with oxygen ( (Oxidation) Even if there is enough oxygen to burn the dust particles around the surrounding dust particles, the ignition / heating / ignition chain propagates. In terms of concentration, one dust particle ignites and burns, so the surrounding oxygen is consumed and not propagated. Conversely, if the dust concentration does not reach a certain level, the distance between the dust particles is too large and the heating action It is also known that it does not propagate because it does not reach the surrounding particles.

  Therefore, the applicant of the present invention pays attention to the fact that dust explosion does not result in dust explosion if measures are taken to prevent heating even under dust concentration conditions where dust clouds are generated and there is a risk of dust explosion. Has been invented in a heat sink, and a means for realizing this has been found. That is, as illustrated in the explanatory diagram of the dust explosion suppressing effect of the explosion-proof dust collecting filter according to the present invention shown in FIG. 9, the dust particles ignited by some cracks in FIG. As it occurs in the part 5A, the heating action decreases as the distance from the ignited dust particles increases, but if there is not a certain amount of space as described above, the oxygen to burn is insufficient. The possibility of ignition propagation due to heating by ignition is limited to particles in the vicinity of a two-dot chain line circle in FIG. 9A (which is actually a space but will be described in two dimensions as a model).

  In FIG. 9 (1), the two particles are heated and ignited, and the two particles are ignited. Next, as shown in FIG. Since the porous metal body 5 that acts as a heat sink absorbs heat, the propagation from subsequent heating to ignition is interrupted. As a result, even if dust is ignited for some reason, the outside of the pore portion 5A (metal porous body space) of the porous metal body 5 indicated by the one-dot chain line in FIG. The applicant of the present invention has confirmed through experiments that a phenomenon occurs in which no propagation occurs and no dust explosion occurs.

  In FIG. 9, the black rhombus portions indicate the skeleton of the porous metal body 5, and the skeletons are actually three-dimensionally connected and have a very large surface area and a large heat capacity. In addition, although the material is metal, in order to exert the effect in such a shape, an inorganic compound such as ceramic may be used besides the metal, and the thermal conductivity of the material has never exceeded, Theoretically, if the substance has a higher thermal conductivity than air, the heat by ignition flows toward the skeleton of the porous body and absorbs heat, resulting in a heat sink effect.

  Further, in the embodiment in which the size of the pore portion 5A shown in FIG. 2 is about 3 mm, the endothermic effect is obtained in the case of a metal powder such as titanium, magnesium or aluminum which has a particle diameter of about 3 to 35 μm and is easily ignited. It has been confirmed that dust explosion can be prevented by dust and dust accumulation can be removed by backwashing with compressed air. The nature of the dust collected, the surrounding environment, and the dust collection capacity in the primary dust collection chamber The pore size and the thermal conductivity of the material composing the metal porous body may be selected and configured while appropriately conducting experiments and the like, and a safe explosion-proof dust collecting filter 1 to which the embodiment of the present invention is applied. In addition, the dust collector 10 can be realized at low cost.

  In addition, the cylindrical filter shown in the embodiment of the present invention can be applied to a flat plate filter and the metal porous body 5 to have a multilayer structure on a plane, and the backwash timing is collected in a plurality of cylindrical filters. Even during dust operation, it is possible to seal off only one place with a disc lid and perform operation (backwashing), which enables continuous dust collection work for a long time. There is no need to collect and discard the secondary filter on which fine dust is accumulated as in the case of the other invention examples, and it is useful for reducing running costs.

  Furthermore, it is possible to combine the technology such as the heat absorption function of Patent Document 1 for preventing re-ignition of the dust collected in the dust bucket 17 or to immediately press and solidify the dust falling from the filter 1 to enhance safety. Yes, it is possible to further improve safety by combining the primary dust collection bucket and the secondary dust collection bucket to prevent the inflow of fire from the primary side to the secondary side. It is.

The filter unit exploded view which showed the external appearance of the explosion-proof filter which concerns on this invention. Sectional drawing of the explosion-proof filter which concerns on this invention. The enlarged view of the metal porous body used for the explosion-proof filter which concerns on this invention. Model explanatory drawing of the metal porous body used for the explosion-proof filter which concerns on this invention. The block diagram of the explosion-proof dust collector which concerns on this invention. The exploded view of the dust collection unit part used with the explosion-proof dust collector which concerns on this invention. The principal part detail drawing of the explosion-proof dust collector which concerns on this invention. The principal part detail figure at the time of the wiping-off (back washing) operation | movement of the explosion-proof dust collector which concerns on this invention. Action | operation explanatory drawing of the explosion-proof filter which concerns on this invention.

Explanation of symbols

1 Explosion-proof filter
2 Filter media
2X Top surface top surface
5 Metal porous body
5A pore part
10 Explosion-proof dust collector
11 Dust collection unit
12 outer cylinder
12A Air intake path
12W dust collection chamber
13 Inner cylinder
13A Exhaust passage
14 Top cover
14A opening
15 Disc as a movable lid
15A round hole
15M disc motor
16 Filter cover
17 Dust bucket
18 Top cover
19 Header
20 Blower
30 Blow tube
SD small dust particles
BD large dust particles

Claims (7)

A dust collecting filter used in a dust collector that collects dust such as highly ignitable dust and chips,
The entire body is made of a solid substance having a higher thermal conductivity than air, and a porous body having three-dimensional pores whose skeleton is continuous in three dimensions is brought into contact with the suction side of the filter medium. An explosion-proof filter for a dust collector, characterized by being arranged as described above.   The explosion-proof filter for a dust collector according to claim 1, wherein the entire porous body is made of metal or ceramics.   The entire filter medium is formed into a cylindrical body having an upper and lower opening type having a circular cross section or a polygonal shape, the inside is filled with the porous body, and dust-containing air is moved from the inside to the outside of the filter medium. The explosion-proof filter for a dust collector according to claim 1 or 2, wherein the dust is collected inside the filter medium by being circulated toward the inside. An explosion-proof dust collector that collects dust, such as highly ignitable dust and chips, using a filter with an explosion-proof function,
The above filter is made of a solid material having a higher thermal conductivity than air, and a porous body having three-dimensional pores in which the skeleton is continuous in three dimensions is formed into a cylindrical shape with an upper and lower opening type. An explosion-proof type arranged so as to be in contact with the inside of the filter medium, and by allowing dust-containing air to flow from the inside to the outside of the filter medium by the suction force of the blower, the dust is passed through the filter medium. Explosion-proof type dust collector, which is configured to collect inside.   A plurality of explosion-proof filters formed by arranging the porous body inside the filter medium are arranged side by side in an upright state in a dust collection chamber, and each explosion-proof filter is disposed on the upper surface side of the plurality of explosion-proof filters. A movable lid that can be selectively closed while rotating the upper surface opening of the mold filter is provided, and when the dust is blown out by blowing backwash air from the outside to the inside of the explosion-proof filter, the driving means is movable. 5. The upper surface opening of the explosion-proof filter is selectively blocked so that the dust collected inside the filter medium by the backwash air is not re-scattered to the intake side by rotating the lid. Explosion-proof dust collector described in 1.   A cylindrical cover body formed concentrically with respect to each of the plurality of explosion-proof filters is provided so as to surround the outer periphery of the explosion-proof filter with a space therebetween, and the dust washing backwashing is performed. The air is configured to be able to be ejected toward the space between each of the explosion-proof filters and the cover body, and the movable lid body is provided with a cover plate portion that closes the upper surface opening of the explosion-proof filter when the dust is removed. The explosion-proof dust collector according to claim 4 or 5, wherein a vent hole that allows the backwash air to be blown in is provided in a peripheral portion of the lid plate portion. An exhaust passage that is internally arranged as a dust collection chamber, and in which the plurality of explosion-proof filters are arranged side by side with a plurality of cover bodies that individually surround these filters and communicates with an external blower An inner cylinder having
An outer cylinder that is disposed concentrically on the outer side of the inner cylinder and has an intake passage in the outer circumferential tangential direction;
These are constituted by a dust bucket provided on the lower side of the inner cylinder and the outer cylinder,
After raising the dust-containing air sucked into the outer cylindrical body through the intake passage by the suction action by the blower, the interval passage between the inner cylindrical body and the outer cylindrical body is formed as a swirl flow, The dust collection chamber is made to flow into the filter through the top opening of the explosion-proof filter and filtered, and the filtered air is sucked into the exhaust passage from the inner cylinder through the gap between the explosion-proof filter and the cover body. The explosion-proof dust collector according to claim 4, wherein the explosion-proof dust collector is exhausted outside.

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