JP2020069456A - Iron powder removing air filter and method for cleaning the same - Google Patents

Abstract

To readily clean adsorbed (held) iron powder without scattering the iron powder.SOLUTION: An iron powder removal air filter (10) for removing iron powder from the atmosphere includes: a filter body (12) made of a raw material capable of being magnetized; and magnetic force adjustment means (14; 16) for adjusting the magnetic force that is induced by the filter body.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to an iron powder removing air filter, and more particularly, to an iron powder for removing iron powder flying in the atmosphere (air; gas) provided in an outside air intake of an apparatus installed in a station yard or the like. The present invention relates to a removal air filter and a cleaning method thereof.

  Devices such as a vending machine, an ATM (automatic teller machine), and a guide terminal are provided with an outside air intake for taking in outside air for exhaust heat inside the device. An air filter is provided at the outside air intake port in order to prevent dust from entering the inside of the device through the outside air intake port. However, if the equipment is installed in an environment where iron powder is present in the atmosphere (air) such as in a station yard, the iron powder flying in the air (air) will be introduced into the equipment from the outside air intake along with the intake air. Come in. This is because the iron powder is fine (for example, its particle size is less than or equal to micrometer) and passes through the air filter. Therefore, a device operating near a railway such as a station yard may be affected by iron powder in the air. Therefore, the device installed in the station yard is an air filter that removes not only dust but also iron powder. (Fine) air filter is used to prevent iron powder from entering the equipment.

  However, such an air filter having fine meshes is apt to be clogged and cannot sufficiently inhale air. Therefore, the temperature inside the device becomes high, and in the worst case, the device may fail. Further, since the air filter having a fine mesh is cleaned more frequently than the normal air filter, there is a problem that the maintenance cost thereof is increased.

  In order to solve the above-mentioned problems, various iron powder removing air filters have been proposed.

  For example, Patent Document 1 discloses a magnetic filter that adsorbs and separates magnetic impurities mixed in a gas, in particular, minute magnetic impurities of μm or less from the gas. The magnetic filter disclosed in Patent Document 1 includes a support made of a material having a magnetic force and a filtering material made of an organic fiber in which the magnetic force is induced by applying a magnetic field. As the organic fiber, an organic fiber containing particles that develop a magnetic force by applying a magnetic field is used.

  Patent Document 2 discloses a magnetic filter that controls the adsorption of magnetic powder in a gas. In the magnetic filter disclosed in Patent Document 2, magnetic particles (small pieces) and non-magnetic particles (small pieces) are mixed and fired or bonded by an adhesive to form a porous state. By this, magnetic flux is generated in the air gap. The magnetic filter disclosed in Patent Document 2 is made by mixing a foamable resin and magnet particles.

  Patent Document 3 discloses a magnetic filter adapted to efficiently adsorb and remove iron powder that enters the air passage. The magnetic filter disclosed in Patent Document 3 is formed by magnetizing a flat plate made of a magnetic material and having a plurality of ventilation holes, or a wire mesh made of a magnetic material. An air filter is provided with this magnetic filter to form a filter device.

  Although not an air filter, Patent Document 4 discloses a fine iron powder collecting device for treating dirty liquid containing sludge of fine magnetic material. The fine iron powder collecting device disclosed in Patent Document 4 is provided with a plurality of electromagnets facing each other with a collecting container containing an alloy fiber filter having a high magnetic flux density and a small holding force sandwiched therebetween. Using this electromagnet and the filter as a DC magnetic field, a dirty liquid containing sludge of fine iron powder is passed through the collection container to adsorb the sludge to the filter. When the filter is full, the electromagnet is turned off (non-energized), the cleaning liquid in which pressurized air is press-fitted is caused to flow into the collection container, and the sludge trapped is removed to regenerate the filter. A DC power supply that creates a DC magnetic field in the electromagnet is connected via a changeover switch.

Japanese Patent No. 3580389 JP-A-60-143810 Japanese Patent No. 5679796 JP, 10-052614, A

  However, the air filters disclosed in Patent Documents 1 to 3 have the following problems.

  Since the magnetic filter of Patent Document 1 uses a support made of a material having magnetic force, that is, a permanent magnet, the magnetic force cannot be adjusted. Further, the magnetic filter of Patent Document 1 only discloses that magnetic impurities are adsorbed and separated from gas, and there is no disclosure or suggestion about a method of cleaning the magnetic filter to remove the adsorbed magnetic impurities from the magnetic filter. Not not.

  Since the filter having magnetism in Patent Document 2 is also magnetized, its magnetic force cannot be adjusted. The magnetic filter of Patent Document 2 only discloses adsorbing magnetic powder in a gas, and does not disclose or suggest a method of cleaning the filter and removing the adsorbed magnetic powder from the filter. ..

  Since the magnetic filter of Patent Document 3 is also configured by magnetizing a flat plate having a ventilation hole or a wire mesh, its magnetic force cannot be adjusted. The magnetic filter of Patent Document 3 also discloses only adsorbing iron powder contained in air, and does not disclose or suggest a method of cleaning the magnetic filter to remove the adsorbed iron powder from the magnetic filter. Not not.

  More specifically, in the magnetic filters (air filters) disclosed in Patent Documents 1 to 3, since the magnetic force cannot be adjusted, it is necessary to use a stronger cleaning magnet during cleaning. In that case, there is a risk that the cleaning magnet will stick to the magnetic filter and will not separate from the magnetic filter, or that the magnetic force of the cleaning magnet will adversely affect the device. Further, in the case of a magnetic filter using a combination of a support made of a permanent magnet and a filter medium as in Patent Document 1, when the filter medium is removed from the permanent magnet (support), the magnetic force remarkably decreases, so that adsorption ( There is also a risk that the retained iron powder will be scattered.

  Note that Patent Document 4 merely discloses a fine iron powder collector that processes dirty liquid containing fine magnetic sludge, and does not disclose an air filter. Further, also in Patent Document 4, since the electromagnet is simply turned on and off by the changeover switch, the magnetic force induced in the filter is not adjusted.

  The present invention has been made in view of the above circumstances, and provides an iron powder removing filter and a cleaning method thereof, which can be easily cleaned without scattering the adsorbed (held) iron powder. The purpose is to

  In order to achieve the above object, as one aspect of the present invention, an iron powder removing filter is an iron powder removing air filter for removing iron powder in the air, and a filter body made of a magnetizable material, And a magnetic force adjusting means for adjusting the magnetic force induced in the filter body.

  As another aspect of the present invention, a cleaning method is a method of cleaning an air filter for removing iron powder, which is adjusted by weakening the magnetic force induced in the filter body by the magnetic force adjusting means, and is weakened. A cleaning magnet having a stronger magnetic force than the magnetic force is rubbed against the filter body, and the iron powder adsorbed on the filter body is transferred to the cleaning magnet.

  According to the present invention, it is possible to easily clean the adsorbed (held) iron powder without scattering it.

It is a perspective view showing a schematic structure of an iron powder removal air filter concerning a 1st embodiment of the present invention. It is a perspective view for demonstrating the method of cleaning the iron powder removal air filter shown in FIG. 1 using a cleaning magnet. It is a side view which shows schematic structure of the air filter for iron powder removal which concerns on the 2nd Embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a perspective view showing a schematic configuration of an iron powder removing air filter 10 according to a first embodiment of the present invention.

  The illustrated iron powder removing air filter 10 is provided at an outside air intake 20 of an apparatus installed at a place where iron powder is present in the atmosphere. The place where the iron powder is present in the atmosphere may be, for example, near the railroad inside the station, the factory building, or the vicinity thereof. The device may be, for example, an industrial device, an automatic vending machine, an ATM (automatic teller machine), or a guide terminal.

  The iron powder removing air filter 10 includes a filter body 12 made of a magnetizable material, an electromagnet 14, and a controller 16.

  Various types can be used as the filter body 12. More specifically, the filter body 12 may be, for example, a filter medium made of an organic fiber containing particles that develop a magnetic force by applying a magnetic field, as described in Patent Document 1. Alternatively, the filter body 12 may be, for example, a filter made by mixing a foaming resin and magnet particles as described in Patent Document 2, but unlike Patent Document 2, the Use unprocessed. Alternatively, the filter body 12 may be, for example, a flat plate made of a magnetic material and having a plurality of ventilation holes, or a magnetic filter made of a wire net made of a magnetic material, as described in Patent Document 3, but Patent Document 3 Unlike, use one that is not magnetized. However, the filter body 12 is not limited to these, and any material may be used as long as it is made of a magnetizable material.

  The electromagnet 14 is arranged near the filter body 12. The electromagnet 14 is for magnetizing the filter body 12. The electromagnet 14 includes an iron core 142 and a coil 144 wound around the iron core 142.

  In the illustrated example, the electromagnet 14 is arranged near the side surface of the filter body 12, but the present invention is not limited to this. Further, in the illustrated example, only one electromagnet 14 is provided, but the number of electromagnets 14 is not limited.

  The controller 16 controls the current flowing through the coil 144 of the electromagnet 14. By controlling the current flowing through the coil 144, the magnetic force induced in the filter body 12 can be adjusted.

  Therefore, the combination of the electromagnet 14 and the controller 16 works as magnetic force adjusting means (14; 16) for adjusting the magnetic force induced in the filter body 12. The magnetic force adjusting means is not limited to this, and any structure may be adopted as long as the magnetic force induced in the filter body 12 can be adjusted.

  For example, the magnetic force adjusting means may include a permanent magnet and an actuator that moves the permanent magnet. In that case, the actuator adjusts the magnetic force induced in the filter body 12 by moving the permanent magnet toward or away from the filter body 12. Further, the magnetic force adjusting means may be composed of, for example, a permanent magnet, a magnetic shield, and an actuator that moves the magnetic shield. In that case, the actuator adjusts the magnetic force induced in the filter body 12 by moving the magnetic shield while the magnetic shield is inserted between the permanent magnet and the filter body 12.

  Thus, the illustrated iron powder removing air filter 10 is an iron powder removing filter that is attached to a device installed in an environment where iron powder is present in the atmosphere (air) such as in a station premises, and uses the electromagnet 14. Then, iron powder in the atmosphere is adsorbed to the filter body 12 while adjusting the strength of the magnetic force.

  By using the magnetizable filter body 12 as in the configuration shown in FIG. 1, since iron powder in the atmosphere (air) is very small, it is attracted by magnetism when passing through the filter body 12, and Stick to the fiber. Therefore, it is not necessary to make the eyes of the filter body 12 very fine as in the related art air filter.

  Further, as shown in FIG. 2, when cleaning the iron powder removing air filter 10, it is easy to transfer the iron powder to the cleaning magnet 18 by weakening the magnetic force of the filter body 12 (magnetic force of the electromagnet 14). .. In this case, the cleaning magnet 18 has a stronger magnetic force than the weakened magnetic force.

  In the first embodiment, the filter body 12 made of a material that can be magnetized under such an environment is magnetized by the electromagnet 14 whose strength of magnetic force can be controlled by the controller 16, and attracts iron powder in the atmosphere to the filter body. Secure (adsorption; hold) at 12. As a result, iron powder can be prevented from entering the inside of the apparatus even if the filter body 12 does not have fine meshes.

  Further, as shown in FIG. 2, when cleaning the iron powder removing air filter 10, the iron powder of the filter body 12 is transferred to the cleaning magnet 18 by rubbing the cleaning magnet 18 against the filter body 12. At this time, by weakening the magnetic force of the electromagnet 14, the magnetic force of the filter body 12 is also weakened, and the iron powder held therein is easily separated from the filter body 12. As a result, the iron powder can be easily transferred from the filter body 12 without making the magnetic force of the cleaning magnet 18 particularly strong. In addition, since the cleaning can be performed while maintaining the magnetic force of the filter body 12, the held iron powder is not scattered.

  In other words, the iron powder removing air filter 10 includes, as shown in FIG. 1, a filter body 12 formed by finely magnetizing a magnetizable material (such as iron) and molding them together, and an electromagnet 14 capable of controlling the magnetic force. It has a filter fixing frame 22 which has.

  The controller 16 magnetizes the electromagnet 14, and simultaneously magnetizes the filter body 12 in contact with the electromagnet 14.

  When the outside air of the apparatus passes through the filter body 12 by the intake air such as an intake fan (see FIG. 3), iron powder in the atmosphere is very small and is attracted magnetically and sticks to the fibers of the filter body 12.

  When cleaning the filter body 12, as shown in FIG. 2, the iron powder is transferred to the cleaning magnet 18 side by rubbing the filter body 12 with the cleaning magnet 18. In that case, the controller 16 reduces the magnetic force of the electromagnet 14 to facilitate the transfer of the iron powder to the cleaning magnet 18.

  Next, the effect of the first embodiment will be described. The first effect is that since the filter body 12 is less likely to be clogged, the iron powder can be removed while ensuring sufficient intake of the device. The second effect is that the frequency of cleaning the iron powder removing air filter 10 can be reduced. The third effect is that the filter body 12 can be easily cleaned.

[Second Embodiment]
FIG. 3 is a side view showing a schematic configuration of an iron powder removing air filter 10A according to a second embodiment of the present invention.

  The iron powder removing air filter 10A shown in FIG. 1 is different from the iron filter removing air filter shown in FIG. It has the same configuration as 10 and operates. Therefore, the controller is labeled with the reference numeral 16A. In order to simplify the description, only the differences will be described in detail below.

  The intake fan 24 is provided near the discharge side of the filter body 12 in the device.

  The flow rate sensor 26 is provided on the discharge side of the filter body 12 and detects the amount of discharged air flow. The flow rate sensor 26 functions as a clogging grasping means for grasping the clogging condition of the filter body 12.

  The controller 16 </ b> A controls the current flowing through the coil 144 of the electromagnet 14 and the rotation speed of the intake fan 24 according to the clogging condition of the filter body 12 which is grasped by the flow rate sensor 26. This makes it possible to optimize the power consumption of the device.

  When it is determined that the clogging condition of the filter body 12 detected by the flow rate sensor 26 is “clogging”, the controller 16A sends the iron powder removing air filter 10A to the management center via the notifying means (not shown). May be notified that is in a "clogging" situation.

  Next, the effect of the second embodiment will be described. In addition to the above first to third effects, the fourth effect is that power can be saved by optimal power adjustment according to individual situations such as the installation environment of the device and the operating time.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these. For example, the present invention includes a mode in which some or all of the embodiments described above are appropriately combined, and a mode in which the mode is appropriately modified.

  For example, in the second embodiment, the case where the clogging grasping means is the flow rate sensor 26 is described as an example, but the present invention may use other clogging grasping means other than the flow rate sensor.

  INDUSTRIAL APPLICABILITY The present invention can be used as an iron powder removing air filter for industrial equipment, vending machines, ATMs (automatic teller machines), guide terminals, etc., installed in places where iron powder is present in the air of station premises or factory buildings. is there.

10, 10A Iron powder removing air filter 12 Filter body 14 Electromagnet 142 Iron core 144 Coil 16, 16A controller 18 Cleaning magnet 20 Outside air intake 22 Filter fixing frame 24 Intake fan 26 Flow sensor (clogging grasping means)

Claims (9)

An iron powder removing air filter for removing iron powder in the atmosphere,
A filter body made of a magnetizable material,
Magnetic force adjusting means for adjusting the magnetic force induced in the filter body,
An air filter for removing iron powder. The magnetic force adjusting means,
An electromagnet that magnetizes the filter body,
A controller for controlling the current flowing through the coil of the electromagnet,
An air filter for removing iron powder according to claim 1, which comprises An intake fan provided near the discharge side of the filter body,
A clogging grasping means for grasping the clogging condition of the filter body,
Further equipped with,
According to the clogging condition of the filter body grasped by the clogging grasping means, the controller controls the current flowing through the coil of the electromagnet and the rotation speed of the intake fan.
The air filter for removing iron powder according to claim 2.   4. The iron powder removing air filter according to claim 3, wherein the clogging grasping unit is a flow rate sensor that is provided on a discharge side of the filter main body and detects an amount of an air flow discharged from the filter main body.   The iron powder removing air filter according to any one of claims 1 to 4, wherein the iron powder removing air filter is provided at an outside air intake port of an apparatus installed in a place where iron powder is present in the atmosphere.   The air filter for removing iron powder according to claim 5, wherein the place where the iron powder is present in the atmosphere is either inside a station or in a factory building.   The iron powder removing air filter according to claim 5 or 6, wherein the device comprises any one selected from an industrial device, a vending machine, an ATM (automatic teller machine), and a guide terminal.   An apparatus comprising the air filter for iron powder removal according to claim 1. A method for cleaning the iron powder removing air filter according to any one of claims 1 to 7, comprising:
Adjusting to weaken the magnetic force induced in the filter body by the magnetic force adjusting means,
A cleaning magnet having a magnetic force stronger than the weakened magnetic force is rubbed on the filter body, and iron powder adsorbed on the filter body is transferred to the cleaning magnet.
How to clean.

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