CN105665142A - Flat plate type air filter with columnar dielectrophoresis electrodes - Google Patents

Abstract

The invention relates to a flat plate type air filter with columnar dielectrophoresis electrodes. The flat plate type air filter comprises a frame shell and a columnar electrode assembly. The frame shell is a rectangular frame. The columnar electrode assembly is embedded in the rectangular frame. Columnar protrusions and holes are evenly distributed on a first electrode plate and a second electrode plate of the columnar electrode assembly. The columnar protrusions and the holes of the first electrode plate and the holes and the columnar protrusions of the second electrode plate are complementary in position. After the two electrode plates are buckled oppositely together, the columnar protrusions of one electrode plate are embedded into the holes of the other electrode plate. The first electrode plate and the second electrode plate are connected with different output ends of a high-frequency alternating current power supply. Acting surfaces for emitting inhomogeneous electric fields outwards are formed on the surfaces, without protrusions, of the first electrode plate and the second electrode plate. The flat plate type air filter with the columnar dielectrophoresis electrodes can be used for separating micron-grade particles. In regions close to the electrodes, the dielectrophoretic force of the columnar dielectrophoresis electrodes is increased by about 10 times compared with cylindrical electrodes.

Description

A flat-plate air filter using columnar dielectrophoresis electrodes

technical field

The invention belongs to the technical field of air filtration, in particular to a flat-plate air filter using columnar dielectrophoresis electrodes.

Background technique

At present, people generally feel that the air quality is not optimistic, and air pollution is the main reason, which is also the root cause of poor air quality. Among the 74 cities in China that monitor air quality, 70 cities have substandard air quality, and in many cases it even reaches serious pollution. For example, the frequent smog incidents in Beijing last year aroused the attention of the entire Chinese people. The serious problem of air pollution cannot be eliminated every two years, and air purifiers are undoubtedly a good solution.

Commonly used air purification technologies include: adsorption technology, negative (positive) ion technology, catalytic technology, photocatalyst technology, superstructure photomineralization technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology, etc. The structure is complex, the production is cumbersome, and the cost is high; the service life of the main components is short, and frequent replacement of components increases the cost; some filter types filter dust, and very small particles may slip through the net, and the dust removal effect is not ideal.

In particular, the electrostatic dust removal method uses a high-voltage direct current electric field to ionize gas molecules in the air, generating a large number of electrons and ions, which move to the poles under the action of the electric field force, and encounter dust particles in the airflow during the movement. Electricity, the charged particles move towards the plate under the action of the electric field force to realize the separation of solid particles or liquid particles from the airflow. Tube-type electrostatic precipitators and plate-type electrostatic precipitators are widely used in industry. The difference between electrostatic dust removal and dielectrophoresis (Dielectrophoresis, DEP) is:

(1) Dielectrophoresis manipulates neutral particles to cause translational motion due to dielectric polarization; electrophoresis manipulates electrons and ions to cause directional movement of the load on dust particles.

(2) The direction of particle movement in dielectrophoresis has nothing to do with the direction of the electric field, only its own dielectric constant and the dielectric constant of the medium; the direction of particle movement in electrophoresis depends on the sign of the charge on the particle and the direction of the electric field, the electric field Reversing the direction reverses the direction of motion.

(3) Dielectrophoresis requires a non-uniform electric field; electrophoresis can occur in a uniform or non-uniform field.

(4) The dielectrophoretic force is proportional to the cube of the particle diameter; the electrophoretic force is proportional to the charge on the particle.

Chinese Patent: A Dielectrophoretic Electrode Structure (Application No.: 201410407467.8, Application Date: 2014.08.19) discloses an electrode with a crossed structure, defined by claim 1 and paragraph [0005] of the specification "the first Some of the wires in the wire group are connected to the positive pole of the power supply, and the other part is connected to the negative pole of the power supply." It can be seen that in the application, the electrode is connected to a DC power supply (only the DC power supply is divided into positive and negative poles). Although the applicant states in paragraph [0006] of the specification that the electrode structure can generate an uneven electric field, the uneven electric field cannot exist continuously in principle.

When the electrodes in the medium are connected to direct current, the charged particles that cannot be offset will gather on the surface of the electrode with opposite polarity due to the electrophoretic effect mentioned above, resulting in an effect similar to electrostatic shielding, and the external electric field strength is reduced to zero. In this way, the effect of generating an inhomogeneous electric field in the middle of the electrodes cannot be achieved, so the above arrangement fails to achieve the purpose of the invention.

Another type of dielectrophoresis electrode used is an independent strip, which is connected to the corresponding output end of the AC power supply through wires. It needs to be installed in the separation chamber one by one and connected to the corresponding output ends through wires, which is not only time-consuming and laborious, but also leads to The structure of the separation chamber is relatively loose, the wiring is complicated, and it is easy to be damaged. In addition, the strip electrodes need to be manufactured one by one, and the process cost is relatively high.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a flat-plate air filter with columnar dielectrophoresis electrodes that has the characteristics of good dielectrophoresis effect, low manufacturing cost, and convenient installation, and can be used for indoor and outdoor dust removal. .

The present invention solves its technical problem and realizes through the following technical solutions:

A flat-plate air filter using columnar dielectrophoretic electrodes, characterized in that it includes a frame housing and a columnar electrode assembly, the frame housing is a rectangular frame, and the columnar electrode assembly is embedded in the rectangular frame; columnar The electrode assembly includes a first electrode plate and a second electrode plate. Columnar protrusions and holes are distributed on the first electrode plate and the second electrode plate. The positions of the holes and the columnar protrusions are complementary; after the protruding surfaces of the first electrode plate and the second electrode plate with the columnar protrusions are engaged with each other, the columnar protrusions of one electrode plate are inserted into the holes of the other electrode plate; The first electrode plate and the second electrode plate are respectively connected to different output terminals of the high-frequency AC power supply, and the non-protruding surfaces of the first electrode plate and the second electrode plate form an active surface for emitting a non-uniform electric field outward, and the columnar electrode assembly Both the first electrode plate and the second electrode plate are provided with slits through which the gas passes; the columnar electrode assembly is perpendicular to the air flow direction, or has an acute angle with the air flow direction.

A power socket is arranged on the frame shell, and the columnar electrode assembly is connected to the high-frequency AC power supply through the power socket.

The surfaces of the first electrode plate and the second electrode plate have insulating layers.

After the protruding surfaces of the first electrode plate and the second electrode plate are locked together, the top of the columnar protrusion made by one electrode plate is flush with the non-protruding surface of the other electrode plate.

The first electrode plate and the second electrode plate are stamped and formed by metal sheet or thin sheet, and the columnar protrusions and holes formed on them form an interlaced array distribution.

The interlaced array distribution method is as follows: the odd-numbered position of the n-th row and the even-numbered position of the n+1-th row of the first electrode plate are columnar protrusions, and the even-numbered position of the n-th row and the n+1-th row The odd-numbered position is the hole position; the columnar protrusion and the hole position of the second electrode plate correspond to the hole position and the columnar protrusion position of the first electrode plate.

The interlaced array distribution method is as follows: the nth row of the first electrode plate is all columnar protrusions or hole positions, and the n+1th row is all hole positions or columnar protrusions; the columnar protrusions and hole positions of the second electrode plate are all Then it corresponds to the position of the holes of the first electrode plate and the positions of the columnar protrusions.

The plate thickness of the first electrode plate and the second electrode plate is the same; the cross-sectional diameter of the columnar protrusion is ≤2.5mm; the columnar protrusion and the hole position are clearance fit, and the fit clearance is not greater than 0.2mm on one side.

The first electrode plate and the second electrode plate are corrugated plates.

Advantage of the present invention and beneficial effect are:

1. The flat-panel air filter of the present invention can be placed on the base, and stacked in dormitory, living room, conference room, car and other spaces as required, and then the power socket is connected to the power supply. Using the natural flow of air, the air enters the columnar electrode assembly from the front of the flat air filter. Since the columnar electrode assembly generates a non-uniform electric field when it is powered on, when the dust-laden airflow passes through the columnar electrode assembly, the dust passing through it is polarized by the electric field , under the action of dielectrophoretic force, it moves towards the direction of stronger electric field and gathers near the dielectrophoretic electrode, and chains and settles down. The purified airflow is discharged from the rear of the flat-plate air filter to improve indoor air quality. In the process of purifying the dust-laden airflow, the present invention only needs to regularly clean the dust accumulated and settled on the lower part of the columnar electrode assembly, and does not need to replace the columnar electrode assembly, so there is no subsequent cost.

2. The flat-plate air filter of the present invention adopts a columnar electrode assembly, and the columnar protrusions and hole positions of different electrode plates of the columnar electrode assembly cooperate with each other to form a working unit body that emits a non-uniform electric field. Under the action of current, the large curvature of the surface of the working unit body increases the surface charge density in the area where the working unit body is located, and the uneven field strength in the area where it is located increases; The working unit body is an open external structure, and the emitted non-uniform electric field passes through the electrode plates to reach the surface, instead of closing the electric field between the two electrode plates, which cannot effectively exert the dielectrophoretic effect of the non-uniform electric field, resulting in waste. At the same time, compared with the surface emission of traditional dielectrophoretic electrodes, the columnar protrusions can form tip emission points, and the dielectrophoretic force in the electric field formed outside the active surface is stronger.

3. The flat-plate air filter of the present invention utilizes dielectrophoresis effect to remove dust, has advanced technology, good dust removal effect, and the dust removal rate can reach 99.9%.

4. The structure design of the flat-plate air filter of the present invention is scientific and reasonable, and has the characteristics of advanced technology, simple structure, easy manufacture, low cost, easy cleaning, long service life, good dust removal effect, and high efficiency. Different groups of electrodes are connected to both ends of the AC power supply, and the dielectrophoretic force in the electric field formed outside the action surface is a highly innovative flat-type air filter with great practical value and market promotion. value.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic diagram of the relative positions of the two electrode plates of the columnar electrode assembly of the present invention before combination;

Fig. 4 is a three-dimensional schematic diagram of the relative position of the two electrode plates of the columnar electrode assembly of the present invention before combination;

Fig. 5 is a structural sectional view of a single electrode plate of a columnar electrode assembly of the present invention;

Fig. 6 is a three-dimensional structural schematic diagram of a single electrode plate of the columnar electrode assembly of the present invention;

Fig. 7 is a combined rear sectional view of two electrode plates of the columnar electrode assembly of the present invention;

Fig. 8 is a three-dimensional schematic diagram of the relative position of the two electrode plates of the columnar electrode assembly of the present invention after combination;

Fig. 9 is a schematic diagram of the particle distribution state of the columnar electrode assembly of the present invention before energization;

Fig. 10 is a schematic diagram of the particle distribution state of the columnar electrode assembly of the present invention after energization;

Fig. 11 is the contour line of the electric field intensity of the non-uniform electric field generated by the columnar electrode assembly of the present invention after electrification.

Explanation of reference signs:

1-frame shell, 2-columnar electrode assembly, 3-power socket, 4-first electrode plate, 5-second electrode plate, 6-columnar protrusion, 7-hole position, 8-action surface.

detailed description

The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

Example 1

As shown in Figures 1 and 2, a flat air filter using columnar dielectrophoretic electrodes includes a frame housing 1, a columnar electrode assembly 2, and a power socket 3. The frame housing 1 is a rectangular frame, and the columnar electrode assembly 2 is embedded installed in the rectangular frame. The columnar electrode assembly 2 includes two electrode plates respectively connected to different output ends of the AC power supply. The columnar electrode assembly 2 is perpendicular to the airflow direction, or has an acute angle with the airflow direction. A power socket 3 is arranged on the frame housing 1 , and the columnar electrode assembly 2 is connected to a high-frequency AC power supply through the power socket 3 .

The air flow enters the columnar electrode assembly 2 from the front of the frame housing 1, passes through the non-uniform electric field generated by the columnar electrode assembly 1 to remove dust, and then discharges from the reverse side. The direction of the airflow in the frame housing 1 is perpendicular to the columnar electrode assembly 2 or has an included angle. The dielectrophoretic electrodes in the columnar electrode assembly 2 are divided into two groups, which are respectively connected to an external AC power supply through the power socket 3 installed on the frame shell 1 .

The columnar electrode assembly 2 that the present invention adopts, its specific structure is:

As shown in Fig. 3 and Fig. 4, the columnar electrode assembly 1 of the present invention includes a first electrode plate 4 and a second electrode plate 5, both of which are sheet-like structures, on which The columnar protrusion 6 and the hole 7, the shape and size of the columnar protrusion 6 on one electrode plate matches the shape and size of the hole 7 on the other electrode plate, and the height of the columnar protrusion 6 is consistent with the thickness of the electrode plate. The outer surfaces of the first electrode plate 4 and the second electrode plate 5 have insulating layers, and the positions of the columnar protrusions 6 of the first electrode plate 4 and the holes 7 of the second electrode plate 5 are complementary, and vice versa.

As shown in Fig. 7 and Fig. 8, during installation, the protruding surfaces of the first electrode plate 4 and the second electrode plate 5 are buckled relative to each other, so that the columnar protrusion 6 of the first electrode plate 4 is inserted into the hole 7 of the second electrode plate 5 Inside, the columnar protrusions 6 of the second electrode plate 5 are inserted into the holes 7 of the first electrode plate 4 , and the columnar protrusions 6 of the two plates cooperate with the holes 7 to form a concentric fit. The top of the columnar protrusion 6 of the first electrode plate 4 is flush with the non-protruding outer surface of the second electrode 2 , and the top of the columnar protrusion 6 of the second electrode plate 5 is flush with the non-protruding outer surface of the first electrode 1 .

Both the first electrode plate and the second electrode plate of the columnar electrode assembly are provided with slits for the passage of gas to ensure the passage of gas flow. The slits can be slotted on the holes on the first electrode plate and the second electrode plate and other positions of the columnar protrusions, so as to form slits for airflow to pass through.

The first electrode plate 4 and the second electrode plate 5 are respectively connected to different output ends of the high-frequency AC power supply, and when energized, a working unit body emitting a non-uniform electric field is formed around the columnar protrusion 6 . Then, the dielectrophoretic electrode structure has two active surfaces 8 on which working unit bodies are distributed. According to the characteristics of the particles in the liquid to be processed, the cross-sectional diameter of the working unit composed of the columnar protrusion 6 and the hole 7 can be changed, and the distance between the working units can be changed on the two active surfaces of the dielectrophoretic electrode structure. 8. The uneven electric field is distributed on the surface to realize the efficient working treatment of the target particles on the entire purification, separation and concentration working surface.

The plate thickness of the first electrode plate and the second electrode plate are the same; the cross-sectional diameter of the columnar protrusion is ≤2.5mm; the columnar protrusion and the hole position are clearance fit, and the fit clearance is not greater than 0.2mm on one side.

As shown in Fig. 5 and Fig. 6, taking the first electrode plate 4 as an example, the first electrode plate 4 is stamped and formed by a thin metal plate or sheet, and the columnar protrusions 6 and holes 7 on it are arranged in a staggered array. Its distribution methods include:

1) The odd-numbered position in row n and the even-numbered position in row n+1 are columnar protrusions 6, and the even-numbered position in row n and the odd-numbered position in row n+1 are hole positions 7. The four positions adjacent to the columnar protrusion 6 are all different hole positions 7 , otherwise the four positions adjacent to the hole position 7 are all different columnar protrusions 6 . When energized, a non-directional and uniformly distributed non-uniform electric field is formed on the surface of the dielectrophoretic electrode structure, that is, the overall uniform distribution, but a non-uniform electric field around the columnar protrusion 6 .

2) The nth row is all columnar protrusions 6/holes 7, and the n+1th row is all holes 7/columnar protrusions 6. When energized, a non-uniform electric field distributed along the working unit body formed by the cooperation of the columnar protrusion 6 and the hole 7 is formed on the surface of the dielectrophoretic electrode structure.

The first electrode plate and the second electrode plate are continuous corrugated plates and are buckled together.

As shown in Figures 9-11, the electrode structure of DEP, the first electrode plate 4 and the second electrode plate 5 are respectively connected to different output terminals of the high-frequency AC power supply, and the phase difference of the AC power is 180°. When the AC power is turned on, the working unit body composed of the columnar protrusions 6 and the holes 7 respectively located on the first electrode plate 4 and the second electrode plate 5 emits an inhomogeneous electric field outward. When the frequency of the AC power input is different , produce a positive dielectrophoretic effect or a negative dielectrophoretic effect on the active surface 8. As shown in Figure 10, the first electrode plate 4 and the second electrode plate 5 are respectively connected to different output terminals of the high-frequency AC power supply. A strong electric field is formed around the outer plane.

Working principle of the present invention is:

Make a base or suspension device for the present invention, place the flat air filter of the present invention on the base, and stack it in spaces such as dormitories, living rooms, conference rooms and cars as required, and then connect the power socket to the power supply. Using the natural flow of air, the air enters the columnar electrode assembly 2 from the front of the flat air filter. Since the columnar electrode assembly 2 generates a non-uniform electric field when the power is turned on, when the dust-laden airflow passes through the columnar electrode assembly 2, the dust passing through it is Electric field polarization, under the action of dielectrophoretic force, it moves to the direction of stronger electric field and gathers near the dielectrophoretic electrode, and chains and settles down. The purified airflow is discharged from the rear of the flat-plate air filter to improve indoor air. quality. In the process of purifying the dust-laden airflow, the present invention only needs to regularly clean the dust accumulated and settled on the lower part of the columnar electrode assembly, and does not need to replace the columnar electrode assembly, so there is no subsequent cost.

Although the embodiments and drawings of the present invention are disclosed for the purpose of illustration, those skilled in the art can understand that various replacements, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims Therefore, the scope of the present invention is not limited to what is disclosed in the embodiments and drawings.

Claims (9)

1. A flat air filter using a columnar dielectrophoretic electrode, characterized in that: it comprises a frame housing and a columnar electrode assembly, the frame housing is a rectangular frame, and the columnar electrode assembly is embedded in the rectangular frame The columnar electrode assembly includes a first electrode plate and a second electrode plate. Columnar protrusions and holes are distributed on the first electrode plate and the second electrode plate. The columnar protrusions and holes of the first electrode plate are connected to the second electrode. The holes of the plates and the positions of the columnar protrusions are complementary; after the protruding surfaces with the columnar protrusions of the first electrode plate and the second electrode plate are buckled relative to each other, the columnar protrusions of one electrode plate are inserted into the holes of the other electrode plate The first electrode plate and the second electrode plate are respectively connected to different output terminals of the high-frequency AC power supply, and an active surface for emitting an inhomogeneous electric field outward is formed on the non-protruding surface of the first electrode plate and the second electrode plate, and the columnar Both the first electrode plate and the second electrode plate of the electrode assembly are provided with slits through which the gas passes; the columnar electrode assembly is perpendicular to the air flow direction, or has an acute angle with the air flow direction. 2. The flat air filter using columnar dielectrophoretic electrodes according to claim 1, characterized in that: a power socket is arranged on the frame housing, and the columnar electrode assembly is connected to the High frequency AC power. 3. The flat-plate air filter using columnar dielectrophoretic electrodes according to claim 1, characterized in that: the surfaces of the first electrode plate and the second electrode plate have insulating layers. 4. The flat air filter using columnar dielectrophoretic electrodes according to claim 1 or 3, characterized in that: after the protruding surfaces of the first electrode plate and the second electrode plate are relatively buckled, one of them The top of the columnar protrusion made by the electrode plate is flush with the non-protruding surface of the other electrode plate. 5. The flat air filter using columnar dielectrophoretic electrodes according to claim 1, characterized in that: the first electrode plate and the second electrode plate are stamped and formed by metal sheets or sheets, and the formed Columnar protrusions and holes form a staggered array distribution. 6. The flat-plate air filter using columnar dielectrophoretic electrodes according to claim 5, characterized in that: the interlaced array distribution mode is: the odd-numbered positions of the nth row of the first electrode plate and The even-numbered position of the n+1 row is a columnar protrusion, the even-numbered position of the n-th row and the odd-numbered position of the n+1-th row are holes; the columnar protrusions and holes of the second electrode plate are the same as the first electrode plate The hole position corresponds to the position of the columnar protrusion. 7. The flat-plate air filter using columnar dielectrophoretic electrodes according to claim 5, characterized in that: the interlaced array distribution method is: the nth row of the first electrode plate is all columnar protrusions or The holes, row n+1 are all holes or columnar protrusions; the columnar protrusions and hole positions of the second electrode plate correspond to the positions of the holes and columnar protrusions of the first electrode plate. 8. The flat-plate air filter using columnar dielectrophoretic electrodes according to claim 1 or 3 or 5 or 6 or 7, characterized in that: the thickness of the first electrode plate and the second electrode plate are the same ; The diameter of the cross-section of the columnar protrusion is ≤2.5mm; the columnar protrusion and the hole are in a gap fit, and the fit gap is not greater than 0.2mm on one side. 9. A household air purifier using columnar dielectrophoretic electrodes according to claim 1 or 3 or 5 or 6 or 7, characterized in that: the first electrode plate and the second electrode plate are corrugated plates .