Dust collector and holding body cover member

Abstract

To provide a technique capable of preventing filter cloth from causing ignition of dust explosion at a lower cost.SOLUTION: The dust collector includes a first air chamber having an intake port through which outside air is introduced, a filter disposed in the first air chamber and configured to separate dust from the air in the first air chamber and allow the air to pass therethrough, and a second air chamber having an introduction port through which the air having passed through the filter is introduced and an exhaust port communicating with the outside of the dust collector.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a dust collector and a holder cover member. [Background technology]

[0002] Patent Document 1 discloses a bag filter type dust collector. This dust collector passes exhaust gas through a filter cloth that constitutes a bag filter and discharges the air from which dust has been removed. The filter cloth is formed by felting a blend of short fluororesin fibers and short carbon fibers. The filter cloth is conductive because it contains carbon fibers, making it possible to prevent static electricity from building up. This prevents the filter cloth from becoming a cause of ignition in a dust explosion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-123051 Summary of the Invention [Problem to be solved by the invention]

[0004] Filter cloths are generally made of polyester fibers or polyester nonwoven fabrics, and are non-conductive, taking into account their dust-removal function. The filter cloth described in Patent Document 1 is expensive compared to typical non-conductive filter cloths because it needs to contain carbon fibers to impart conductivity. Because filter cloths are consumables, it is desirable to employ non-conductive filter cloths from the perspective of cost reduction. The present disclosure provides a technology that can prevent filter cloths from causing ignition of dust explosions at a lower cost. [Means for solving the problem]

[0005] A dust collector according to one aspect of the present disclosure comprises a first air chamber having an intake port through which outside air is introduced, a filter disposed in the first air chamber and separating dust from the air in the first air chamber and allowing the air to pass through, a second air chamber having an inlet through which air that has passed through the filter is introduced and an exhaust port that communicates with the outside of the device, and the filter has a filter cloth that filters the dust, a holder that maintains the shape of the filter cloth, and a holder cover member that is disposed between the filter cloth and the holder, is conductive, and is electrically connected to the outside of the device.

[0006] A holder cover member according to another aspect of the present disclosure is a holder cover member used in a filter having a filter cloth that filters dust and a holder that maintains the shape of the filter cloth, and is disposed between the filter cloth and the holder, is conductive, and has a connection portion for grounding. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to prevent filter cloth from becoming a cause of ignition of a dust explosion at a lower cost. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of a dust collection system having a dust collector according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the filter shown in FIG. [Figure 3] FIG. 3 is a diagram showing an example of how the cage and the cover member are attached. [Figure 4] FIG. 4 is a diagram showing an example of how the fixing member and the filter cloth are attached. [Figure 5] FIG. 5(A) is an example of a cross section of the filter when the fan is not operating, and FIG. 5(B) is an example of a cross section of the filter when the fan is operating. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicate descriptions will be omitted. The dimensional ratios of the drawings do not necessarily match those in the description. The terms "upper," "lower," "left," and "right" are based on the illustrated state and are for convenience only.

[0010] [Dust collector configuration] A dust collector according to one embodiment is installed in, for example, a factory to collect dust in the air. Dust is a powder that is fine enough to float in the air, and includes fumes generated during laser processing, plasma processing, welding, and the like.

[0011] FIG. 1 is a schematic diagram showing an example of a dust collection system having a dust collector according to an embodiment. In the figure, the X and Y directions are horizontal, and the Z direction is vertical. Hereinafter, the Z direction will also be referred to as the up-down direction. As shown in FIG. 1, the dust collection system 2 includes a dust collector 1. The dust collector 1 includes a housing 10. The housing 10 is supported on the ground by a support member and is also grounded. The housing 10 introduces outside air into the interior through an air intake port 10a. An air intake duct 11 is provided at the air intake port 10a. A dust collection hood 11a is provided at the tip of the air intake duct 11, which efficiently draws in outside air (dust-containing air) from the target space. The housing 10 exhausts the air from which dust has been removed to the outside of the device through an exhaust port 10b. An exhaust duct 12 is provided at the exhaust port 10b.

[0012] The internal space of the housing 10 is divided by a partition plate 15 into a dust chamber S1 (an example of a first air chamber) which is the space below the partition plate 15, and a clean air chamber S2 (an example of a second air chamber) which is the space above the partition plate 15. The periphery of the partition plate 15 is connected to the inner wall surface of the housing 10 in an airtight manner.

[0013] The dust chamber S1 is a chamber into which air to be collected is supplied. The dust chamber S1 is in communication with the outside of the device via an air intake 10a. A filter 20 is housed in the dust chamber S1. The filter 20 separates dust from the air in the dust chamber S1 and allows the air to pass through. The filter 20 has a cylindrical body made of a material such as paper or cloth. Details of the filter 20 will be described later. The upper end of the filter 20 is airtightly connected to an inlet 15a formed in the partition plate 15. As a result, the filter 20 is arranged in the dust chamber S1 so as to hang down from the partition plate 15. The outer peripheral surface of the body of the filter 20 faces the dust chamber S1, and the internal space of the body is in communication with the clean air chamber S2.

[0014] The clean air chamber S2 is a chamber to which dust-free air is supplied. A fan 30 is connected to the exhaust duct 12. The fan 30 is, for example, a blower. The fan 30 generates an airflow toward the outlet of the exhaust duct 12. This generates an airflow toward the exhaust port 10b in the clean air chamber S2, creating a negative pressure in the dust chamber S1, and outside air is sent into the dust chamber S1 through the intake port 10a of the dust chamber S1.

[0015] That is, when the blower 30 is operated, outside air containing dust is introduced into the dust chamber S1 via the intake duct 11 and the intake port 10a. The dust-containing air passes from the outer peripheral surface of the filter 20 to the inner peripheral surface of the filter 20, where it is separated into air and dust. The air from which the dust has been removed (clean air) is sent into the clean air chamber S2, and is discharged outside the dust collector 1 via the exhaust port 10b and the exhaust duct 12. In this way, the dust collector 1 separates the dust in the air into the filter 20 by passing the air through the dust chamber S1, the filter 20, and the clean air chamber S2 in that order.

[0016] A dust removal device 31 is disposed in the clean air chamber S2. The dust removal device 31 removes dust particles adhering mainly to the outer peripheral surface of the filter 20 by blowing compressed air into the filter 20 in pulses. This restores the filtering function of the filter 20.

[0017] The lower part of the housing 10 forms a hopper section 10c, which tapers in diameter as it goes downward. The hopper section 10c collects the dust that has been brushed off. A discharge mechanism 21 is provided at the bottom end of the hopper section 10c. A disposal container (not shown) is disposed below the discharge mechanism 21, and the dust is discharged from the hopper section 10c into the container.

[0018] [Filter Configuration] Fig. 2 is a diagram showing an example of the filter shown in Fig. 1. As shown in Fig. 2, the filter 20 includes a filter cloth 201, a cage (an example of a holder) 202, and a cover member (an example of a holder cover member) 203.

[0019] As shown in FIG. 2, the filter cloth 201 is a member that constitutes the outside of the filter 20. The filter cloth 201 is a cloth that filters dust, allowing air to pass through while capturing dust contained in the air. The filter cloth 201 is formed of, for example, polyester fiber or polyester nonwoven fabric. For example, the filter cloth 201 is nonconductive. The term "nonconductive" means that the surface resistivity is 1×10 11 Ω / m 2 The above refers to the filter cloth 201. The filter cloth 201 has a cylindrical shape with a bottom. The shape of the filter cloth 201 is not limited as long as it is a cylindrical shape with a bottom, and the cross section may be circular, rectangular, or star-shaped. The opening at the upper end of the filter cloth 201 is airtightly connected to the inlet 15a. As a result, the outer peripheral surface of the filter cloth 201 faces the dust chamber S1, and the inside of the filter cloth 201 communicates with the clean air chamber S2.

[0020] When the blower 30 is operating, the bottomed cylindrical filter cloth 201 will collapse due to the suction pressure, so a cage 202 is placed inside the filter cloth 201. The cage 202 is also called a retainer and maintains the shape of the filter cloth 201. The cage 202 has a framework structure using, for example, wire rods. The cage 202 is made of a lightweight and durable material such as steel, stainless steel, resin, or aluminum. As an example, the cage 202 is obtained by fixedly connecting multiple ring members arranged coaxially at a pitch of about 250 mm with wire members. The wire members are arranged at a pitch of about 30 mm in the circumferential direction of the ring members.

[0021] As described above, the filter cloth 201 is non-conductive and therefore becomes charged when charged dust adheres to it or when friction occurs when dust comes into contact with the filter cloth 201. When the filter cloth 201 is charged, dust tends to adhere to it, reducing the effectiveness of the dust removal device 31. Furthermore, static electricity can cause ignition of a dust explosion.

[0022] In order to reduce the charge on the filter cloth 201, a conductive cover member 203 is provided between the filter cloth 201 and the cage 202. The conductive cover member 203 has a surface resistivity of 1×10 11 Ω / m 2 The cover member 203 has a connection part 203a for grounding. The connection part 203a is electrically connected to the dust collector 1 by a copper wire 204 or the like. This allows static electricity on the filter cloth 201 to escape to the outside of the device (for example, the ground) via the cover member 203, the copper wire 204, and the dust collector 1.

[0023] The cover member 203 has a shape that does not obstruct airflow, such as a net or lattice shape. The cover member 203 has a mesh structure of 1 to 5 meshes, for example. A mesh is the number of holes arranged in a length of 25.4 mm (1 inch). A mesh structure smaller than 1 mesh reduces the contact area with the filter cloth 201, thereby reducing the antistatic effect of the filter cloth 201. A mesh structure larger than 5 meshes increases the complexity of the structure, increasing manufacturing costs and reducing the effectiveness of removing dust adhering to the filter cloth 201 when using high-pressure air or the like to remove it. By making the cover member have a mesh structure of 1 to 5 meshes, the dust collector 1 can appropriately exhibit the antistatic effect of the filter 20 and the dust removal effect.

[0024] The cover member 203 may be stretchable. The stretchability is sufficient as long as the cover member 203 can be attached by placing it over the cage 202. For example, the cover member 203 may be made of a soft material. In this case, the cover member 203 can be attached to cages 202 of various sizes, and can therefore be retrofitted to existing cages 202. There is no need to prepare a separate cage specifically for attaching the cover member 203. As an example, the cover member 203 is made of metal-deposited fibers. Alternatively, the cover member 203 may be made of threads woven with fine metallic fibers and non-metallic fibers. The metal may be aluminum, stainless steel, or the like, and the non-metallic fiber may be nylon, or the like.

[0025] Fig. 3 is a diagram showing an example of attachment of a cage and a cover member. As shown in Fig. 3, a mesh-structured cover member 203 is attached to the outside of a framework-structured cage 202. If the cover member 203 is stretchable, it is fixed to the cage 202 by its stretching force. Note that the cover member 203 does not need to be fixed to the cage 202. The cover member 203 attached to the cage 202 is called a fixed member.

[0026] Fig. 4 is a diagram showing an example of the attachment of a fixing member and a filter cloth. As shown in Fig. 4, a fixing member 205 is housed inside the filter cloth 201. This allows the filter cloth 201 to maintain its cylindrical shape even during suction. The filter cloth 201 and the fixing member 205 may or may not be fixed to each other. The filter 20 is formed by assembling the fixing member 205 and the filter cloth 201 shown in Fig. 4.

[0027] FIG. 5A shows an example of a cross-section of the filter when the blower 30 is not operating. When the blower 30 is not operating, no suction force is generated, and the filter cloth 201 is not in sufficient contact with the cover member 203. In this case, even if the filter cloth 201 becomes charged, the static electricity cannot be released to the cover member 203. However, dust is not attracted to the cover member 203, so there is no need to avoid ignition of a dust explosion. FIG. 5B shows an example of a cross-section of the filter when the blower 30 is operating. When the blower 30 is operating, suction force is generated, and the filter cloth 201 is drawn toward the center of the circle, and its shape is maintained by the cage 202. At this time, the filter cloth 201 is in sufficient contact with the cover member 203. Therefore, even if the filter cloth 201 becomes charged, static electricity can be released through the cover member 203.

[0028] [Summary of the embodiment] In the dust collector 1, outside air is introduced into the dust chamber S1 through the air inlet 10a. The air in the dust chamber S1 passes through the filter 20. As the air passes through the filter 20, dust contained in the air is separated. The air from which the dust has been removed is introduced into the clean air chamber S2 through the inlet 15a and discharged to the outside of the device through the exhaust port 10b of the clean air chamber S2. The filter cloth 201 of the filter 20 maintains its shape by the cage 202 when air passes through it. A cover member 203 is provided between the filter cloth 201 and the cage 202. Therefore, the filter cloth 201 comes into contact with the cover member 203 when air passes through it, and is electrically connected to the cover member 203. The electric charge (static electricity) charged on the filter cloth flows to the outside of the device via the conductive cover member 203. In this way, this dust collector 1 can prevent the filter cloth from becoming electrically charged even when a general non-conductive filter cloth is used, and therefore, compared to when a filter cloth containing carbon fiber is used, it can prevent the filter cloth from becoming a cause of ignition in a dust explosion at low cost.

[0029] In the dust collector 1, there is no need to impart an antistatic function to the filter cloth 201 itself, so not only can a general filter cloth be used, but also a filter cloth imparted with a function other than the antistatic function. For example, a filter cloth imparted with a flame-retardant function or a filter cloth imparted with a high filtration function can be used. In other words, since other functions can be imparted to the filter cloth on the premise of the antistatic function, a wider range of design options for the filter cloth can be provided.

[0030] In the dust collector 1, the cover member 203 is provided inside the filter cloth 201, which prevents damage to the cover member 203 caused by flying dust. Since the cover member 203 is covered by the filter cloth 201, the dust collector 1 can be operated without periodic replacement of the cover member 203.

[0031] [Variations] Although various exemplary embodiments have been described above, various omissions, substitutions, and modifications may be made without being limited to the above-described exemplary embodiments. For example, in the embodiment, an example in which the cage 202, the cover member 203, and the filter cloth 201 are attached in this order has been described, but the order of attachment is not limited thereto. The connection portion 203a of the cover member 203 may be any portion to which the copper wire 204 or the like can be electrically connected, and any portion of the cover member 203 may serve as the connection portion 203a.

[0032] [Summary of the embodiments of the present disclosure] The present disclosure includes the following aspects.

[0033] (Clause 1) A dust collector comprising: a first air chamber having an intake port through which outside air is introduced; a filter disposed in the first air chamber and separating dust from the air in the first air chamber and allowing the air to pass; a second air chamber having an intake port through which air that has passed through the filter is introduced; and an exhaust port communicating with the outside of the device, wherein the filter has a filter cloth that filters out dust, a holder that maintains the shape of the filter cloth, and a holder cover member that is disposed between the filter cloth and the holder, is conductive, and is electrically connected to the outside of the device.

[0034] In this dust collector, outside air is introduced into the first air chamber through an air intake port. The air in the first air chamber passes through a filter. As the air passes through the filter, dust particles contained in the air are separated. The dust-removed air is introduced into the second air chamber through an inlet port and discharged to the outside of the device through an exhaust port of the second air chamber. The filter cloth of the filter is maintained in shape by a holder when air is passed through it. A holder cover member is provided between the filter cloth and the holder. Therefore, the filter cloth comes into contact with the holder cover member when air is passed through it, and is electrically connected to the holder cover member. The electric charge (static electricity) on the filter cloth flows to the outside of the device through the conductive holder cover member. In this way, this dust collector can prevent the filter cloth from becoming charged even when using a non-conductive general filter cloth. Therefore, compared to using a filter cloth containing carbon fiber, it can prevent the filter cloth from becoming a cause of ignition in a dust explosion at a low cost.

[0035] (Clause 2) In the dust collector described in Clause 1, the holder cover member may be stretchable. In this case, the holder cover member can be attached to holders of various sizes, and therefore can be retrofitted to an existing holder.

[0036] (Clause 3) In the dust collector according to clause 1 or 2, the holder cover member may have a mesh structure of 1 to 5 meshes. By having the holder cover member have a mesh structure of 1 to 5 meshes, the dust collector can appropriately exhibit the antistatic effect of the filter and the dust-removing effect.

[0037] (Clause 4) In the dust collector according to any one of clauses 1 to 3, the filter cloth may be cylindrical with a bottom, an opening of the filter cloth may be connected to the inlet, the holder may be disposed inside the filter cloth, and may have a framework structure using wires, and the holder cover member may be attached to the framework structure. In this case, the dust collector can avoid a cause of ignition while maintaining the cylindrical shape of the filter cloth.

[0038] (Clause 5) A holder cover member according to another aspect of the present disclosure is a holder cover member used in a filter having a filter cloth that filters dust and a holder that maintains the shape of the filter cloth, the holder cover member being disposed between the filter cloth and the holder, being conductive, and having a grounding connection. The filter cloth of the filter is maintained in shape by the holder when air is passed through it. The holder cover member is disposed between the filter cloth and the holder. The filter cloth comes into contact with the holder cover member when air is passed through it, and is electrically connected to the holder cover member. Electric charge (static electricity) on the filter cloth flows to the outside via the grounding connection of the conductive holder cover member. In this way, this holder cover member can prevent the filter cloth from becoming charged even when a non-conductive general filter cloth is used, and therefore, compared to when a filter cloth containing carbon fiber is used, it can prevent the filter cloth from becoming a cause of ignition in a dust explosion at low cost. [Explanation of symbols]

[0039] 1...dust collector, 10a...air intake port, 10b...exhaust port, 15a...inlet port, 20...filter, S1...dust chamber (an example of a first air chamber), S2...clean air chamber (an example of a second air chamber), 201...filter cloth, 202...cage (an example of a holder), 203...cover member (an example of a holder cover member).

Claims

1. a first air chamber having an air intake port through which outside air is introduced; a filter disposed in the first air chamber, separating dust from the air in the first air chamber and allowing the air to pass; a second air chamber having an inlet through which the air that has passed through the filter is introduced and an exhaust port that communicates with the outside of the device; Equipped with The filter is A filter cloth for filtering the dust; A holder that maintains the shape of the filter cloth; a holder cover member that is provided between the filter cloth and the holder and has conductivity and is electrically connected to the outside of the device; A dust collector having

2. The dust collector according to claim 1 , wherein the holder cover member is stretchable.

3. 3. The dust collector according to claim 1, wherein the holder cover member has a mesh structure of 1 to 5 meshes.

4. The filter cloth has a bottomed cylindrical shape, and an opening of the filter cloth is connected to the inlet, The holder is disposed inside the filter cloth and has a framework structure using wire rods, 3. The dust collector according to claim 1, wherein the holder cover member is attached to the framework structure.

5. A holder cover member used in a filter having a filter cloth that filters dust and a holder that maintains the shape of the filter cloth, a holder cover member provided between the filter cloth and the holder, the holder cover member being electrically conductive and having a ground connection portion;

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