Magnetic purification device utilizing combined action of neodymium-iron-boron magnet and charging device

Abstract

The invention discloses a magnetic purification device utilizing combined action of a neodymium-iron-boron magnet and a charged device. The device is provided with a magnetic matrix, a charged electric field and a neodymium-iron-boron film dust collection plate according to a flow. The magnetic matrix is used for trapping particles through magnetic force, the charged electric field can charge small-particle-size particles carried by airflow flowing out of the magnetic matrix, then the small-particle-size particles flow through the neodymium-iron-boron film dust collection plate, and the particles are trapped through the strong magnetism of the neodymium-iron-boron film, deflect under the action of the magnetic field and Lorentz force and are collected by the dust collection plate. The neodymium-iron-boron material adopted by the invention is a permanent magnet with magnetism only second to that of an absolute zero-degree holmium magnet at present, has high anisotropy and needs to be magnetized by an external magnetic field, and the maximum removal rate of the device on small-particle-size particles such as PM1 can be increased by using the neodymium-iron-boron material.

Description

Technical Field

[0001] The invention relates to the field of magnetic purification related equipment, in particular to a magnetic purification device in which a neodymium iron boron magnet and a charging device act together. Background Art

[0002] As one of the main means of public transportation in today's society, the subway brings great convenience to people's travel. At the same time, the problem of air purification in the subway has become increasingly important. Studies have found that 75%-85% of the particulate matter in subway tunnels and platforms are iron-containing compounds, the main components of which are Fe, Fe3O4, α-Fe2O3 and γ-Fe2O3. The harm of iron-containing compounds to the human body cannot be underestimated. As an oxidant, excessive intake of iron by the human body may affect the insulin production process, cause damage to the liver and lungs, and even cause cancer. Therefore, magnetic purification equipment has begun to be used in subway air purification.

[0003] Magnetic purification equipment is a kind of purification equipment that uses electromagnetic effect and magnetic force as the main principle for dust removal. The magnetic field causes charged particles to move in a circle. The dust particles make a spiral motion toward the dust collecting plate under the combined action of the electric field force and the magnetic field force, which greatly prolongs the time of the particles in the purifier and changes the collision direction of the dust and the plate, which is beneficial to dust removal. This is the effect of the electromagnetic effect. The magnetic force can make the dust whose main component contains iron compounds directly captured by the magnet. In the purification of subway magnetic dust, there is a set of devices composed of a combination of magnets and metal mesh. The high gradient magnetic field is formed by the external magnetic field generated by the permanent magnet bar, and the grid lines are magnetized at the same time. The carrier gas is loaded with evenly distributed magnetic particles flowing through the mesh filter and is captured. In addition, there is also a magnetic matrix equipped with acrylic fiber filtration (MM+MC).

[0004] The existing related filtering equipment such as magnet plus metal mesh, magnetic matrix plus acrylic fiber mentioned above can achieve a removal rate of 40% to 60% for larger dust particles such as PM10, but the removal rate for small dust particles such as PM1.0 and PM2.5 is low, and there is still room for improvement. In addition, in the prior art, due to the small magnetic flux provided, the Lorentz force on the charged dust in the magnetic field is weak, which also reduces the possibility of dust being captured by the dust collecting plate. Summary of the invention

[0005] The object of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a magnetic purification device which combines a NdFeB magnet with a charging device.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A magnetic purification device with a NdFeB magnet and a charging device acting in combination, comprising a dusty air inlet pipe connected to the outside air, wherein the air inlet pipe is sequentially connected to: a magnetic matrix unit for collecting dust by magnetic force, a charging electric field unit for charging small-size dust carried by an outflowing airflow of the magnetic matrix, a NdFeB film dust collecting plate unit for collecting magnetic dust particles by strong magnetism, and a clean air outlet pipe for sending out clean air.

[0008] The magnetic matrix unit includes a magnetic cage with left and right ends respectively connected to the pipeline, and two groups of magnetic matrices are arranged in the magnetic cage, each group of magnetic matrices is composed of two rows of cross-arranged magnets, and the magnets are arranged perpendicular to the airflow direction;

[0009] The charged electric field unit comprises a shell whose left and right ends are respectively connected to the pipeline, and 3-4 corona electrodes are arranged in the shell, and the corona electrodes are connected to the negative electrode of the high-voltage power supply;

[0010] The NdFeB thin film dust collecting plate unit comprises a shell whose left and right ends are respectively connected to the pipeline, and a total of 6-8 NdFeB thin film dust collecting plates are arranged in the shell. The NdFeB thin film dust collecting plates are designed as positive plates and negative plates. The positive plates and the negative plates are staggered and arranged side by side, and the spacing between the plates is equal. The surface of the NdFeB thin film dust collecting plate (4-2) is covered with a layer of NdFeB film (4-3).

[0011] The magnets have a size of 100 mm×25 mm×5 mm and are made of neodymium iron boron, with 9 to 12 magnets in each group.

[0012] The corona electrode is made of a circular structure and a high-strength nickel-chromium alloy with a diameter of 1.5mm-2.5mm.

[0013] The edge of one side of the NdFeB film dust collecting plate is provided with a perforation, and a metal electrode column for fixing the NdFeB film dust collecting plate is inserted into the perforation, and the two groups of metal electrode columns are respectively connected to the positive and negative electrodes of the high-voltage power supply, and the negative electrode plate is grounded. The substrate of the NdFeB film dust collecting plate is made of metal material. The thickness of the NdFeB film is 10-50μm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention arranges the magnetic matrix, charged electric field and NdFeB film dust collecting plate in independent spaces respectively, and each independent space is connected by a pipeline. The magnetic matrix magnet is a permanent magnet second only to the absolute zero holmium magnet, has high anisotropy and strong magnetism, and can provide a large magnetic flux, so that the Lorentz force on the charged dust in the magnetic field is enhanced, thereby increasing the possibility of dust capture.

[0016] 2. The dust collecting plate covered with NdFeB film used in the present invention is mainly used to capture small-size dust particles such as PM2.5 and PM1.0, thereby improving the overall removal rate of dust particles.

[0017] 3. Before the dust-laden air passes through the dust collecting plate covered with NdFeB film, it flows through the charged electric field, and the particles are charged by the corona discharge, so that the particles are subjected to the dual effects of magnetic force and Lorentz force when passing through the dust collecting plate, thereby improving the removal rate of the device for particles in the air.

[0018] Fourth, the present invention is mainly used in places such as subway stations, and can greatly reduce the harm caused by iron-containing dust particles to passengers and staff who work in subway stations for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of the magnetic matrix unit 2;

[0021] Figure 3 yes Figure 1 A schematic structural diagram of a medium-charged electric field unit 3;

[0022] Figure 4 yes Figure 1 A schematic diagram of the structure of the NdFeB dust collecting plate unit 4 and a schematic diagram of the structure of the connection of the NdFeB dust collecting plates;

[0023] Figure 5 It is a schematic diagram of the perforation setting structure of the NdFeB dust collecting plate.

[0024] Figure numerals: 1 dusty air inlet duct 2 magnetic matrix unit 2-1 magnetic cage 2-2 frame 2-3 magnet 3 charged electric field unit 3-1 shell 3-2 corona electrode 4 NdFeB film dust collecting plate unit 4-1 shell 4-2 NdFeB film dust collecting plate 4-3 NdFeB film 4-4 perforation 4-5 metal electrode column 5 clean air outlet duct DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] As attached Figure 1-4As shown, a magnetic purification device with a NdFeB magnet and a charging device acting in combination, comprises a dusty air inlet pipe 1 connected to the outside air, wherein the air inlet pipe 1 is sequentially connected through a pipe with: a magnetic matrix unit 2 for realizing dust capture by magnetic force, a charging electric field unit 3 for charging small-size dust carried by the airflow outflowing from the magnetic matrix, a NdFeB film dust collecting plate unit 4 for capturing magnetic dust particles with strong magnetism, and a clean air outlet pipe 5 for sending out clean air; the magnetic matrix unit 2 comprises a magnetic cage 2-1 whose left and right ends are respectively connected to the pipe, and two groups of magnetic matrices are arranged in the magnetic cage 2-1 through a frame 2-2, each group of magnetic matrices is composed of two rows of cross-arranged magnets 2-3, and the specification of the magnets 2-3 is 100mm ×25mm×5mm, made of neodymium iron boron, the number of each group of 9-12 sheet structures, this embodiment is set to 9, the magnets 2-3 are all arranged perpendicular to the direction of the airflow; the charged electric field unit 3 of the present invention includes a shell 3-1 connected to the pipeline at both ends, and a total of 3-4 corona electrodes 3-2 are arranged in the shell. In this embodiment, there are 3, and the corona electrode 3-2 is a circular structure made of high-strength nickel-chromium alloy with a diameter of 1.5mm-2.5mm. The corona electrode 3-2 is connected to the negative electrode of the high-voltage power supply; the neodymium iron boron thin film dust collecting plate unit 4 of the present invention includes a shell 4-1 connected to the pipeline at both ends, and a total of 6-8 neodymium iron boron thin film dust collecting plates 4-2 are arranged in the shell 4-1, such as Figure 4 As shown in the embodiment 1, the number of the NdFeB film dust collecting plates 4-2 is set to 7, which are arranged in order from top to bottom with equal spacing, such as Figure 5 As shown in the present embodiment 2, there are 7 NdFeB thin film dust collecting plates 4-2, which are arranged in staggered layers with equal spacing from top to bottom. Perforations 4-4 are respectively arranged on one side edge of the NdFeB thin film dust collecting plates 4-2, and metal electrode columns 4-5 for fixing the NdFeB thin film dust collecting plates 4-2 are inserted into the perforations 4-4. In embodiment 2 of the present invention, when the NdFeB thin film dust collecting plates are arranged in staggered layers, the metal electrode columns are arranged on the left and right, one of which is connected to the odd-numbered dust collecting plates, and the other is connected to the even-numbered dust collecting plates. The metal electrode columns 4-5 are respectively connected to the positive and negative poles of the high-voltage power supply, and the negative plate is grounded. The base material of the NdFeB thin film dust collecting plate 4-2 described in the present invention is made of metal material, and the surface of the NdFeB thin film dust collecting plate 4-2 is also covered with a layer of NdFeB film 4-3. The thickness of the NdFeB film 4-3 described in this embodiment is 10-50μm.

[0027] The present invention can be widely used in various subway stations for purifying dusty air. The neodymium iron boron material can be used at room temperature for a long time without demagnetization due to its strong coercive force and other characteristics, and can even be longer than the service life of the equipment. It can be regarded as a "permanent magnet". Therefore, the use of neodymium iron boron can bring many advantages to the present invention.

[0028] The above are preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. Any equivalent replacement, modification, improvement, etc. made within the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A magnetic purification device with a NdFeB magnet and a charging device acting in combination, comprising a dusty air inlet pipe (1) connected to the outside air, wherein the air inlet pipe (1) is sequentially connected to: a magnetic matrix unit (2) for collecting dust by magnetic force, a charging electric field unit (3) for charging small-size dust carried by an outflowing airflow of the magnetic matrix, a NdFeB film dust collecting plate unit (4) for collecting magnetic dust particles by strong magnetism, and a clean air outlet pipe (5) for sending out clean air, The magnetic matrix unit (2) comprises a magnetic cage (2-1) whose left and right ends are respectively connected to the pipeline, and two groups of magnetic matrices are arranged in the magnetic cage (2-1) through a frame (2-2), each group of magnetic matrices is composed of two rows of cross-arranged magnets (2-3), and the magnets (2-3) are all arranged perpendicular to the direction of the airflow; The charged electric field unit (3) comprises a shell (3-1) whose left and right ends are respectively connected to the pipeline, and 3-4 corona electrodes (3-2) are arranged in the shell, and the corona electrodes (3-2) are connected to the negative electrode of the high-voltage power supply; The NdFeB thin film dust collecting plate unit (4) comprises a shell (4-1) whose left and right ends are respectively connected to the pipeline, and a total of 6-8 NdFeB thin film dust collecting plates (4-2) are arranged in the shell (4-1). The NdFeB thin film dust collecting plates (4-2) are designed as positive plates and negative plates. The positive plates and the negative plates are staggered and arranged side by side, and the spacing between the plates is equal. The surface of the NdFeB thin film dust collecting plate (4-2) is covered with a layer of NdFeB film (4-3).

2. The magnetic purification device in which the NdFeB magnet and the charging device act in combination according to claim 1 is characterized in that: The magnets 2-3 have a size of 100mm×25mm×5mm and are made of neodymium iron boron, with a sheet structure of 9-12 in each group.

3. The magnetic purification device in which the NdFeB magnet and the charging device act in combination according to claim 1 is characterized in that: The corona electrode (3-2) is a circular structure and is made of a high-strength nickel-chromium alloy with a diameter of 1.5mm-2.5mm.

4. The magnetic purification device in which the NdFeB magnet and the charging device act in combination according to claim 1 is characterized in that: A perforation (4-4) is provided on the edge of one side of the NdFeB thin film dust collecting plate (4-2), and a metal electrode column (4-5) for fixing the NdFeB thin film dust collecting plate (4-2) is inserted into the perforation (4-4). The two groups of metal electrode columns (4-5) are respectively connected to the positive and negative poles of the high-voltage power supply, and the negative pole plate is grounded. The base material of the NdFeB thin film dust collecting plate (4-2) is made of metal material.

5. The magnetic purification device in which the NdFeB magnet and the charging device act in combination according to claim 1 is characterized in that: The thickness of the NdFeB film (4-3) is 10-50 μm.

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