JP2015089535A - Electric dust collection filter unit with cottony filter body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector which is safe, which has a simple structure, where the removal performance of air dust is enhanced and which does not clog for a long term.SOLUTION: An electric dust collection filter unit is provided with an ionization means 7 to ionize air at an upstream side and a filter part 8 at a downstream side. A cottony filter body 16 laminated to be cottony with charged fibers 17 and conductive fibers 18 being uniformly mixed in a ventilation direction is housed in a filter case 14 having a lattice-like conductor 15 at a bottom or a top part. The filter part 8 is composed by coming into contact with the conductive fibers 18 and the lattice-like conductor 15 and being conductive with each other. The conductive fibers 18 is connected to the ground via the lattice-like conductor 15.

Description

  The present invention relates to an air cleaning filter that removes atmospheric dust in the air.

(Prior art 1)
A two-stage electrostatic precipitator as shown in FIG. 10 is generally known as an air cleaning device that removes atmospheric dust and cleans the air. Hereinafter, the two-stage electrostatic precipitator will be described.

  As shown in FIG. 10, the conventional two-stage electrostatic precipitator includes a charging unit 101 and a dust collecting unit 104 in order from the upstream side.

  The charging unit 101 includes a linear discharge electrode 102 and a charging unit ground electrode plate 103 provided so as to sandwich it. A high voltage is applied to the discharge electrode 102 by the high-voltage power source 107, and the charging portion ground electrode plate 103 is connected to the ground and becomes 0 V. Corona discharge occurs between the two.

  The dust collection unit 104 includes a high voltage electrode plate 105 and a dust collection unit ground electrode plate 106. The high-voltage electrode plate 105 and the dust collecting portion ground electrode plate 106 are alternately stacked while providing a space at a predetermined interval. A high voltage is applied to the high-voltage electrode plate 105 by a high-voltage power source 107, the ground is connected to the dust collecting portion ground electrode plate, and is 0 V, and an electric field is provided in the space created between the two. Yes.

  Air is taken into the two-stage electrostatic precipitator along the ventilation direction 108, and atmospheric dust contained in the air collides with air ions generated by corona discharge in the charging unit 101 and is charged. The charged atmospheric dust is sent to the dust collecting unit 104 on the downstream side, and passes through a space formed between the high voltage electrode plate 105 and the dust collecting unit ground electrode plate 106. And it moves by receiving Coulomb force by the electric field provided in the space. As shown in FIG. 10, when a positive high voltage is applied to each of the discharge electrode 102 and the high voltage electrode plate 106, atmospheric dust is positively charged, and the positively charged atmospheric dust is grounded from the high voltage electrode plate 105 to the dust collector ground. It moves to the electrode plate 106, adheres to the dust collecting portion ground electrode plate 106, and is removed from the air.

(Prior art 2)
Moreover, there exists an air purifying apparatus of patent document 1 as another dust collector. Hereinafter, this air purifier will be described with reference to FIG. The air purifying apparatus shown in FIG. 11 includes a charging unit 101 and a dielectric filter medium 109 in order from the upstream side. The charging unit 101 is the same as that described in (Prior Art 1), and charges the atmospheric dust that has passed through corona discharge. The dielectric filter medium 109 is a sheet formed by mixing dielectric fibers 109a and conductive fibers 109b, and is connected to the ground. An electric field is provided between the discharge electrode 102 to which a high voltage is applied and the conductive fiber 109b, and the dielectric fiber 109a existing in the electric field is dielectrically polarized to induce charges.

  The atmospheric dust in the air that has passed through the charging unit 101 along the ventilation direction 108 is charged, and the charged atmospheric dust is adsorbed and collected by the dielectric fiber 109a in which the charge is induced by the electric field.

(Prior art 3)
Moreover, there exists a filter of patent document 2 as another dust collector. Hereinafter, this filter will be described with reference to FIG. A charged fiber assembly 112 in which countless charged fibers 110 are fixed to the support plate 111 is formed. An electric field is provided between the adjacent charged fibers 110 by the charge of the charged fibers. Then, a structure in which corrugated hollow spacers 113 having air permeability and four charged fiber aggregates 112 are alternately stacked and stored in a filter case 115 while being partitioned by a partition plate 114 is provided.

  Air is taken into the filter along the ventilation direction 108, and atmospheric dust in the air is adsorbed and collected by an electric field created by the charged fibers 110.

JP 62-87262 A (Fig. 1) JP-T-2002-501433 (FIG. 1)

  The two-stage electrostatic precipitator described in Prior Art 1 has a structure in which a large number of high-voltage electrode plates and dust collector ground electrode plates must be alternately stacked with a certain interval in order to form a dust collector. Is complicated and very difficult to make. In addition, since high voltage is applied to the high-voltage electrode plate, it is necessary to prevent people from touching it for safety, and to prevent short circuits from occurring between the dust collector ground electrode plate and the case frame. It cannot be made easily.

  In addition, the air cleaning device described in the prior art 2 can be made relatively easily without applying a high voltage to the dielectric filter medium. However, because of the sheet shape, the ventilation direction is perpendicular to the filter medium, and the collected atmospheric dust Accumulates on the filter media and fills the gaps necessary for ventilation. Therefore, clogging occurs early, and the air flow rate decreases in a short period.

  In addition, since it has a structure in which only one planar electric field perpendicular to the ventilation direction is created, there is no electric field having a depth in the ventilation direction, and high dust collection performance cannot be obtained.

  In order to blend, it is realistic to mix a short dielectric fiber and a short conductive fiber in a solution so as to spread the paper. However, if a short conductive fiber is used for blending, the conductive fibers can be brought into contact with each other to conduct electricity. Difficult, it is not easy to connect the dielectric filter media to ground and make it 0V.

  Further, in the filter described in Prior Art 3, the potential difference between the charged fibers is not clear, and the electric field created by the charged fibers is not strong. Therefore, high dust collection performance cannot be obtained. In addition, as the atmospheric dust is collected, the charged fibers are uncharged, and the dust collection performance is gradually lowered.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an electric dust collection filter unit that can be produced easily and in large quantities, is not clogged for a long period of time, and can maintain high dust collection performance. And

  In order to solve the above-mentioned problems, the electric dust collection filter unit of the present invention comprises ionization means for ionizing air on the upstream side and a filter unit on the downstream side, and uniformly mixed charged fibers and conductive fibers. By placing a cotton-like filter body that is laminated in a cotton-like manner in the ventilation direction in a filter case having a lattice-like conductor at the bottom or top, and conducting the conductive fibers and the lattice-like conductor in contact with each other The filter portion is configured and achieves the initial purpose by connecting the conductive fiber to the ground through the grid-like conductor.

  The electric dust collection filter unit of the present invention charges atmospheric dust and charged fibers in the air by attaching air ions generated by ionization means. Therefore, an electric field is always created between the conductive fiber connected to the ground and the charged charged fiber. A long and strong electric field having a depth in the ventilation direction is created in the cotton-like filter body formed by laminating uniformly mixed charged fibers and conductive fibers in the ventilation direction. The charged atmospheric dust adheres to the fiber and is collected by the Coulomb force given by this long and strong electric field. Therefore, high dust collection performance can be obtained, and high dust collection performance can always be maintained.

  Further, because of the principle of charging the charged fiber by the adhesion of air ions, it is not necessary to apply a high voltage directly to the charged fiber, and a safe and simple structure can be achieved.

  In addition, the cotton-like filter body formed by laminating uniformly mixed charged fibers and conductive fibers in a cotton shape in the ventilation direction has an infinite number of collecting surfaces in the ventilation direction. Atmospheric dust is dispersed and collected on the collection surface, so it will not clog for a long time.

The figure which shows the room which installed the electric dust collection filter unit in the natural inlet of Embodiment 1 of this invention The figure which shows the room which installed the electric dust collection filter unit which connected the air blower to the same downstream side Configuration diagram showing the same electric dust filter unit Configuration diagram of the ionization means Configuration diagram of ionizing means of another form Configuration diagram of the filter unit Configuration diagram showing the skewer conductor The figure which shows the manufacturing method which creates the same cotton-like filter body with a melt spinning nozzle Diagram showing the electric field created by the charged and conductive fibers The block diagram which shows the electric dust collector of prior art 1 The block diagram which shows the air purifying apparatus of the prior art 2 Configuration diagram showing filter according to prior art 3

  The electrostatic precipitating filter unit according to claim 1 of the present invention includes an ionizing means for ionizing air on the upstream side and a filter unit on the downstream side, and uniformly charging and conductive fibers are mixed in the ventilation direction. On the other hand, the filter unit is configured by placing a cotton-like filter body formed by laminating in a cotton shape in a filter case having a lattice-like conductor at the bottom or top, and bringing the conductive fiber and the lattice-like conductor into contact conduction. It is comprised and connects a conductive fiber to earth | ground through a grid | lattice-like conductor.

  As a result, air ions generated by the ionization means adhere to charge the atmospheric dust and charged fibers in the air. Therefore, an electric field is always created between the conductive fiber connected to the ground and the charged charged fiber. A long and strong electric field having a depth in the ventilation direction is created in the cotton-like filter body formed by laminating uniformly mixed charged fibers and conductive fibers in the ventilation direction. The charged atmospheric dust adheres to the fiber and is collected by the Coulomb force given by this long and strong electric field. Therefore, high dust collection performance can be obtained, and high dust collection performance can always be maintained.

  Further, because of the principle of charging the charged fiber by the adhesion of air ions, it is not necessary to apply a high voltage directly to the charged fiber, and a safe and simple structure can be achieved.

  In addition, the cotton-like filter body formed by laminating uniformly mixed charged fibers and conductive fibers in a cotton shape in the ventilation direction has an infinite number of collecting surfaces in the ventilation direction. Atmospheric dust is dispersed and collected on the collection surface, so it will not clog for a long time.

  According to a second aspect of the present invention, the electric dust collecting filter unit is configured to connect the skewer-shaped conductor inserted into the cotton-like filter body to the ground, and connect the conductive fiber to the ground through the skewer-shaped conductor.

  Thereby, a conductive fiber can be reliably connected to earth | ground and high dust collection performance can be acquired reliably.

  Moreover, the electrostatic dust collection filter unit according to claim 3 uses a cotton-like filter body produced by blowing charged fibers and conductive fibers from two melt spinning nozzles adjacent to the grid-shaped conductor. .

  The two melt spinning nozzles blow out charged and conductive fibers at a very high speed, and a cotton-like filter body can be made with a simple method of blowing out from the melt spinning nozzle. Is possible.

  Hereinafter, the present embodiment will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the present embodiment will be described with reference to the drawings.

  FIG. 1 shows a diagram in which an electric dust collection filter unit 1 of the present invention is provided in a natural air inlet 3 of a room 2. A ventilation fan 4 for discharging the air in the room 2 to the outside and a natural air inlet 3 for taking in the outside air by the amount of the discharged air are installed on the ceiling of the room. The electric dust collection filter unit 1 is provided in the natural air supply port 3 and has a function of removing atmospheric dust in the air entering the room. Therefore, clean air enters the room 2 from the natural air inlet 3 along the ventilation direction 5 and the room 2 is filled with clean air.

  Next, the figure which provided the air blower 6 in the downstream of the electrostatic dust collection filter unit 1 is shown in FIG. A blower 6 is provided on the downstream side of the electric dust collection filter unit 1, and the air in the room 2 is taken into the electric dust collection filter unit 1 by the blower 6. Atmospheric dust in the air taken in along the ventilation direction 5 is removed from the air by the electric dust collection filter unit 1, and air purified by removing atmospheric dust is returned to the room 2. The air in the room 2 is purified by repeatedly taking in the air in the room 2, removing atmospheric dust, and returning it to the room 2.

  The structure of the electrostatic dust collection filter unit 1 is shown in FIG. 3, the ionization means 7 constituting the electrostatic dust collection filter unit 1 is shown in FIG. 4, and the ionization means 7 of another form is shown in FIG. As shown in FIG. 3, the electrostatic dust collection filter unit 1 includes an ionization unit 7 and a filter unit 8 in order from the upstream side. Air is fed in the order of the ionization means 7 and the filter unit 8 along the ventilation direction 5.

  Some ionization means 7 generate air ions by irradiating X-rays or ultraviolet rays to ionize air molecules. Here, the ionization means 7 using corona discharge, which is the simplest method, will be described. The ionization means 7 shown in FIG. 4 includes a linear discharge electrode 9 and a ground electrode plate 10 provided so as to sandwich it. A high voltage is applied to the discharge electrode 9 by the high-voltage power supply 11, and the ground electrode plate 10 is connected to the ground and becomes 0V, and corona discharge occurs between them. The atmospheric dust 12 that has passed through the ionization means 7 collides with and adheres to the air ions 13 generated by corona discharge, and is charged. Here, the dimensions of the ionization means 7 and the polarity of the applied high voltage are not limited as long as corona discharge is generated, but as an example, the two ground electrode plates 10 provided at an interval of 25 mm. A discharge electrode 9 made of a tungsten wire having a diameter of 0.1 mm is provided at an intermediate position of the electrode, a ground electrode plate 10 is connected to the ground, and a voltage of +6 kV is applied to the discharge electrode 9 to generate a positive corona discharge. it can.

  Further, another form of ionization means shown in FIG. 5 will be described below. The ionization means 7 shown in FIG. 5 has a structure in which a ground electrode plate 10 is provided at a certain interval next to the needle-like discharge electrode 9. Then, a high voltage is applied to the discharge electrode 9, and the ground electrode plate 10 is connected to the ground to make 0V, thereby generating a corona discharge. Air ions 13 are generated by the generated corona discharge, and the air ions 13 are combined with the atmospheric dust 12 to charge the atmospheric dust 12. As an example, a needle-like electrode having a barrel radius of 1 mm and a tip radius of 20 to 100 μm is used as the discharge electrode 9, a ground electrode plate 10 is provided beside 10 mm, the ground electrode plate 10 is connected to the ground, and the discharge electrode 9 A negative corona discharge can be generated by applying a voltage of -6 kV to the voltage.

  As described above, the air ion 13 is generated in the air by the ionization means 7, and the atmospheric dust 12 in the air is charged. Then, air containing air ions 13 and charged atmospheric dust 12 is sent to the filter unit 8 on the downstream side.

  Here, FIG. 6 shows the configuration of the filter unit 8, FIG. 7 shows the skewer-shaped conductor 19, and FIG. 8 shows an example of a manufacturing method of the cotton-like filter body 16 using a melt spinning nozzle. As shown in FIG. 6, the cotton-like filter body 16 is configured by laminating the charged fibers 17 and the conductive fibers 18 that are uniformly mixed in the ventilation direction 5, and the filter portion 8 is formed at the bottom or top. The structure is such that the cotton-like filter body 16 is housed in the filter case 14 having the grid-like conductor 15 and at the same time the conductive fibers 18 and the grid-like conductor 15 are brought into contact with each other. The conductive fibers are connected to the ground by connecting the grid-like conductor 15 to the ground.

  Further, as shown in FIG. 7, the skewer-shaped conductor 19 is formed by integrating a plurality of rod-shaped conductors 20, which are pointed at the tip and easily pierced into the cotton-like filter body 16, by a base 21. Since the base 21 has conductivity, the rod-shaped conductors 20 are electrically connected. The filter unit 8 shown in FIG. 6 has a skewer-like conductor 19 inserted into the cotton-like filter body 16 and brought into contact with the conductive fiber 18, and then the skewer-like conductor 19 is connected to the ground in the same manner as the lattice-like conductor 15. Yes. By doing so, the connection between the conductive fiber 18 and the ground is ensured, and a high dust collection performance is surely obtained.

  A cotton-like filter body 16 formed by laminating the charging fiber 17 and the conductive fiber 18 in a cotton shape with respect to the ventilation direction 5 includes, as shown in FIG. 8, the charging fiber 17 and the conductive fiber from two melt spinning nozzles, respectively. It can be made by blowing 18 out. Specifically, the charged fiber 17 is blown out from the melt spinning nozzle A22 and the conductive fiber 18 is blown out from the melt spinning nozzle B23 toward the grid-like conductor 15 into the filter case 14. The melt spinning nozzle A22 and the melt spinning nozzle B23 extrude the heat-melted resin from the central resin extrusion hole 24 and at the same time blow out high-temperature compressed air from the high-temperature compressed air holes 25 provided on the left and right. The molten resin extruded from the resin extrusion hole 24 is subdivided into high-temperature compressed air blown out from the left and right at high speed, and becomes fibrous. In this way, the charged fiber 17 and the conductive fiber 18 are made.

  As an example of a material that can be used, the charged fiber 17 is obtained by heating and melting a polypropylene resin or a polyester resin and blowing it from the melt spinning nozzle A22, and the fiber diameter is approximately 1 to 100 μm. The conductive fiber 18 is obtained by heating and melting polypropylene resin or polyester resin uniformly containing conductive carbon black and blowing it out from the melt spinning nozzle B23. The fiber diameter is about 1 to 100 μm, similar to the charged fiber. is there.

  Then, by moving the filter case 14 back and forth and right and left in the direction indicated by the moving direction 26 indicated by the arrow, the charged fibers 17 and the conductive fibers 18 can be mixed uniformly in the horizontal plane in the filter case 14. . The mixed charged fibers 17 and conductive fibers 18 can be stacked in the upward direction in FIG. Since the charged fibers 17 and the conductive fibers 18 are blown out at a high speed from the two melt spinning nozzles, the cotton-like filter body 16 is formed in an extremely short time. Therefore, it can be produced in large quantities.

  Air including air ions 13 and charged atmospheric dust 12 is sent to the filter unit 8 configured as described above. The charged fiber 17 has a property of being charged when an object having a charge adheres thereto. Therefore, as shown in FIG. 7, the air ions 13 coming from one to the next adhere and the charge of the air ions 13 is given to the charged fiber 17. Since the charged fiber 17 is insulative, the electric charge does not disappear even if it is in contact with the conductive fiber 18, the grid-like conductor 15, and the skewer-like conductor 19 having conductivity. Moreover, even if the electric charge is lost, the charged state is always maintained by the air ions 13 constantly coming from the upstream side.

  Here, an electric field generated by the charged fiber 17 and the conductive fiber 18 constituting the filter unit 8 is shown in FIG. Since the charged fiber 17 is always charged and has a charge on its surface, as shown in FIG. 9, the conductive fiber 18 connected to the ground is charged with a charge having a polarity opposite to that of the charged fiber 17 from the ground. Therefore, an electric field as shown by an arrow is created between the two. A minute gap is provided between the charged fiber 17 and the conductive fiber 18 while partly contacting. Since the gap is small, the electric field created by both is strong. In addition, since the uniformly mixed charged fibers 17 and conductive fibers 18 are laminated in a cotton shape with respect to the ventilation direction 5, this strong electric field is created in all the long and deep areas in the ventilation direction 5. . The charged atmospheric dust 12 is collected and collected on the charged fiber 17 or the conductive fiber 18 by the Coulomb force given by the electric field, but the dust collection performance is greatly enhanced by creating such a strong and long electric field.

  The electric dust collecting filter unit according to the present invention can be easily produced and clean air having high cleanness can be obtained without clogging over a long period of time. It is useful as a dust collection device for an air purifier that takes in and cleans the water.

DESCRIPTION OF SYMBOLS 1 Electric dust collection filter unit 2 Room 3 Natural air inlet 4 Ventilation fan 5 Ventilation direction 6 Blower 7 Ionization means 8 Filter part 9 Discharge electrode 10 Ground electrode plate 11 High voltage power supply 12 Atmospheric dust 13 Air ion 14 Filter case 15 Grid-like conductor 16 Cotton-like filter body 17 Charged fiber 18 Conductive fiber 19 Skew-like conductor 20 Rod-shaped conductor 21 Base 22 Melt spinning nozzle A
23 Melt spinning nozzle B
24 Resin extrusion hole 25 High temperature compressed air hole 26 Movement direction

Claims (3)

A cotton-like filter body comprising an ionization means for ionizing air on the upstream side and a filter part on the downstream side, and a uniform mixture of charged and conductive fibers laminated in a cotton shape in the ventilation direction Is placed in a filter case having a grid-like conductor at the bottom or top and the conductive fiber and the grid-like conductor are brought into contact with each other to form a filter unit, and the conductive fiber is connected to the ground through the grid-like conductor. Electric dust filter unit. 2. The electrostatic dust collecting filter unit according to claim 1, wherein the skewer-shaped conductor inserted into the cotton-shaped filter body is connected to the ground, and the conductive fiber is connected to the ground through the skewer-shaped conductor. The electrostatic precipitating filter unit according to claim 1 or 2, wherein a cotton-like filter formed by blowing charged fibers and conductive fibers from two adjacent melt spinning nozzles toward the grid-shaped conductor is used.

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