JPWO2019003379A1 - Dust collection device and air conditioner - Google Patents

Abstract

The dust collection device (1) includes a plurality of friction charged dust collectors (2) arranged at intervals to form air passages (20) through which air passes, and dust collectors. At least one of the dust collecting bodies that includes at least one friction body (3) that is frictionally charged and that is opposed across the air path, at least one protrusion (21) that protrudes toward the air path Have. According to the dust collection device of the present invention, in the frictional charge type dust collection device, an uneven electric field can be formed around the charging member to induce a gradient force, and the particle collection rate can be improved.

Description

  The present invention relates to a dust collection device that generates static electricity by friction to collect dust, and an air conditioner equipped with the same.

  There is an electric precipitator as one of the dust collection devices for collecting dust in the air. An electrostatic precipitator corona discharges by applying a high voltage to a wire electrode with a high voltage power supply, and the generated ions charge the dust in the air by the generated ions, and the high voltage power supply is high between the flat electrode An electrostatic field is formed by applying a voltage, and the dust collecting unit electrostatically collects the charged dust on the flat plate, and the dust is collected with a low pressure loss by the electrostatic collection mechanism. To achieve However, since an electrostatic precipitator generally uses discharge and high voltage, it may be difficult to handle.

  On the other hand, as a dust collection device for collecting dust in the air without application of a high voltage, friction collection type dust collection devices are known (for example, Patent Documents 1 and 2). By charging the insulator by friction, it becomes a charged body, causing a Coulomb force with dust in the air, and collecting the dust on the charged body by the force. The friction-charged dust collection devices of Patent Documents 1 and 2 do not use discharge or high voltage, and thus have an advantage of being easier to handle than an electrostatic precipitator.

JP 2002-336733 A JP, 2002-186879, A

  However, in the friction-charged dust collection device, there is room for improvement in the collection rate of the collection target particles in the air.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a friction charging type dust collection device having an improved particle collection rate.

The dust collection device according to the present invention is
A plurality of frictionally charged dust collectors spaced from one another so as to form an air passage through which air passes;
And at least one friction body for charging the dust collection body by friction.
At least one of the dust collecting bodies facing each other across the air passage has one or more protrusions projecting toward the air passage.

  According to the dust collection device of the present invention, since the uneven electric field is formed around the dust collection body by providing the protrusion on the dust collection body, the gradient force is induced. The particle collection rate in the device can be improved.

It is the schematic which shows the dust collection device of Embodiment 1 of this invention. It is a side view which shows the principal part of the dust collection device of Embodiment 1 of this invention. It is a perspective view which shows the example of a shape of the dust collection body in Embodiment 1 of this invention. It is a perspective view which shows the example of a shape of the dust collection body in Embodiment 1 of this invention. It is a perspective view which shows the example of a shape of the dust collection body in Embodiment 1 of this invention. It is a side view which shows a motion of the friction body and projection part in Embodiment 1 of this invention. It is a side view which shows the principal part of the dust collection device of Embodiment 2 of this invention. It is a side view which shows the principal part of the dust collection device of Embodiment 3 of this invention. It is a perspective view which shows the principal part of the dust collection device of Embodiment 4 of this invention. It is a side view which shows the principal part of the dust collection device of Embodiment 4 of this invention. It is a side view which shows the principal part of the dust collection device of Embodiment 4 of this invention.

  Hereinafter, preferred embodiments of the dust collection device according to the present invention will be described with reference to the drawings. The same or corresponding parts in the respective drawings will be described with the same reference numerals.

Embodiment 1
The schematic of the dust collection device of Embodiment 1 of this invention is shown in FIG. The main part is shown in FIG.

  The dust collection device 1 holds a plurality of dust collecting bodies 2, a friction body 3 that rubs the dust collecting bodies 2 to charge static electricity, a casing that includes an outer shell 5 covering them, and the friction body 3 And a drive unit 4 configured to frictionally move along the outer surface of the dust collection body 2.

  The plurality of dust collecting bodies 2 are arranged at intervals so as to form an air passage 20 between adjacent dust collecting bodies 2. That is, the dust collectors 2 are disposed to face each other with the air passage 20 interposed therebetween. The shell 5 also includes an inlet 51 through which air flows in and an outlet 52 through which the air that has passed through the air passage 20 flows out. The air containing the particles to be collected flows in from the inflow port 51, passes through the air passage 20 formed between the opposing dust collecting bodies 2, and becomes an air in which the particles are collected and purified. It flows out of the outlet 52.

  The dust collection body 2 is formed of a material that generates static electricity and is charged by friction with the friction body 3. A plurality of protrusions 21 protruding toward the air passage 20 are provided on the surface of the dust collection body 2. The number of protrusions 21 is not limited, and may be one or more. In addition, the protrusion 21 may be provided on only one of the dust collecting bodies 2 facing each other with the air passage 20 interposed therebetween, or may be provided on both.

  When the plurality of dust collectors 2 are charged by friction, an electric field is generated between the facing dust collectors 2. In an electric field, a coulomb force acts on charged particles in the air, and the particles are collected by being attracted and attached to the surface of the dust collection body 2 by the action.

  At this time, since the protrusions 21 are present on the surface of the charged dust body 2, the distance between the facing dust bodies 2 is short at the tip end of the protrusions 21 and long at the root portion of the protrusions 21; The distance becomes uneven. Therefore, the electric lines of force converge toward the tip of the protrusion 21. On the other hand, in the vicinity of the root of the protrusion 21, the electric line of force from the opposing dust collection body 2 is not converged. In the vicinity of the protrusion 21, an uneven electric field having a gradient of the electric field in the direction along the electric force line is formed, and a gradient force is induced. The gradient force is a force that causes the particles to be unbalancedly polarized and attracted in the strong direction of the electric field by the electric field gradient in the unequal electric field, and works even if the particles are not charged. Therefore, it also acts on non-charged particles in the air, and the particles are attracted to and collected by the dust collection body, so that a higher collection rate can be obtained as compared with the case without the protrusions 21.

  The friction body 3 is made of a material that generates static electricity by friction with the dust collection body 2, and is disposed in contact with the surface of the dust collection body 2. In the first embodiment, the friction body 3 is provided in the air passage 20 formed between the opposing dust collection bodies 2 so as to simultaneously rub the surface of each dust collection body 2 facing the air passage 20. It is arranged. In addition, one dust collecting body 2 is disposed so as to be rubbed by being sandwiched between two friction bodies 3. The arrangement of the friction members 3 is not limited to this, and the surfaces of the dust collection members 2 facing the air passage 20 may be arranged to be rubbed by different friction members 3 respectively. In addition, the dust collecting body 2 may be rubbed on each side without being sandwiched by the friction body 3.

  The friction body 3 extends in the direction of the flow of air in the air passage 20, and is installed to move in the direction transverse to the flow of air. Thereby, it can suppress that passage of air is inhibited by the friction body 3.

  As a combination of the material of the dust collection body 2 and the friction body 3, for example, acrylic and nylon, polyester and nylon, PTFE and nylon, polypropylene and nylon, etc. are used. It is preferable that the positional relationship between the charge trains is far because the power consumption is increased. Moreover, the material of the dust collection body 2 and the friction body 3 may be reverse.

  The drive unit 4 includes drive means 41 such as a motor, a drive shaft 42 having a spiral groove on the outer surface, and a holder 43 for holding the friction member 3. The holder 43 is in threaded engagement with the drive shaft 42, and the drive shaft 42 is connected to the drive means 41. The drive shaft 42 is rotated by the rotation of the drive means 41, and the holding body 43 screwed to this is moved, whereby the plurality of friction bodies 3 held by the holding body 43 are moved. Rub the surface. The drive shaft 42 is orthogonal to the direction of the air flow flowing through the air passage 20 and the direction in which the protrusions 21 are disposed.

  The drive means 41 and the drive shaft 42 which comprise the drive part 4 are located in the outer side of the air path 20 formed between the dust collection bodies 2 which oppose. As a result, the flow of air flowing through the air passage 20 is not impeded, and an increase in pressure loss can be suppressed.

  When the dust collecting body 2 is frictionally charged, the dust collecting body 2 is charged by operating the drive unit 4 to move the friction body 3 and rubbing each dust collecting body 2. When friction is not performed, the friction body 3 is positioned at the end of the air passage 20 in order to reduce the hindrance to fluid passage. When the dust collecting body 2 is to be recharged, the friction member 3 is moved again by the driving unit 4 to rub each dust collecting body 2 to charge the static electricity. Furthermore, by rubbing the dust collection body 2 with the friction body 3, it is possible to separate and remove from the dust collection body 2 dust which has been attached to the dust collection body 2 and has lost the charge.

  In the dust collection device according to the first embodiment configured as described above, since the protrusion 21 is provided on the surface of the dust collection body 2, a gradient force is induced in addition to the Coulomb force, and collection of particles in the air The rate can be increased.

  Next, the dust collection body 2 and the friction body 3 will be described in more detail.

  As shown in FIG. 1, the protrusions 21 provided on the dust collection body 2 are plate-like, and are disposed along the passing direction of air passing through the air passage 20 from the inflow port 51 toward the outflow port 52. . As a result, it is possible to suppress the blocking of the passage of the air flowing through the air passage 20 by the protrusions 21 and to suppress the rise of the pressure loss, thereby flowing the air more efficiently.

  The shape of the projection 21 is not limited to a plate, and may be a bowl, a fiber (for example, a pile of piles), a wave, or any other shape, through which the air passing through the air passage 20 passes. Can be arranged along the The example of a shape of the projection part 21 is shown to FIGS. In particular, in the case of the bowl-like or fibrous form as shown in FIG. 4, the number of the projections serving as the source of the uneven electric field increases, so the induction of the gradient force is promoted and the particle collection rate is further enhanced. ,preferable.

  Also, the protrusion 21 has flexibility. Thereby, when moving the friction body 3 and rubbing the surface of the dust collection body 2, as shown in FIG. 3, the projection 21 is pushed by the friction body 3 and falls down, and the friction body 3 moves over it Therefore, the movement of the friction body 3 is not hindered. In FIG. 3, after passing over the protruding portion 21 where the friction body 3 falls down, the protruding portion 21 returns to the air channel 20 as it was originally. As a result, interference between the protrusion 21 and the friction member 3 can be suppressed, and the surface of the dust collection member 2 can be efficiently rubbed and charged.

  In particular, in order not to obstruct the flow of air passing through the air passage 20, the protrusions 21 are disposed along the air flow direction, and the friction body 3 disposed to extend along the air flow direction is In the case of moving in the direction crossing the flow of the above, the protrusion 21 and the friction body 3 easily interfere with each other. Therefore, since the protrusion 21 has flexibility, interference between the protrusion 21 and the friction member 3 is suppressed without obstructing the flow of air, and the dust collection member 2 is efficiently rubbed. Can be charged.

  The friction body 3 comprises a core 31 and a friction material 32 disposed with the core 31 as a base. The friction material 32 is formed of a material that generates static electricity and charges the dust collection body 2 by rubbing the dust collection body 2. As the friction material 32, for example, a brush, a sponge, a plate, a column, a film, a non-woven or the like can be used. Further, the external shape of the friction material 32 may be a shape along the surface shape of the dust collection body 2. For example, in the case where the dust collection body 2 is curved, the outer shape of the friction material 32 may be adjusted along the curve. By matching the external shape of the friction material 32 to the surface shape of the dust collection body 2, the surface of the dust collection body 2 can be reliably rubbed. Furthermore, the core material 31 is not limited to a flat plate shape, and may have a substantially wave shape along the surface shape of the dust collection body 2 or a structure having a protrusion on a flat plate.

  Moreover, it is preferable that the core material 31 is made of a material having high rigidity, so that it is possible to prevent an increase in movement resistance of the friction body 3 without bending when the friction body 3 moves. On the other hand, it is preferable that the friction material 32 be made of a material having flexibility, so that it can be deformed following the surface shape of the dust collection body 2 and the dust collection body 2 can be efficiently rubbed. .

  Also, the friction body 3 is grounded. Specifically, the core material 31 constituting the friction body 3 is formed of a highly conductive material such as metal, and is electrically connected to the ground electrode outside the apparatus via a copper wire or the like. The friction material 32 preferably has high conductivity, and may be provided with conductivity by using a material provided with carbon or metal.

  Since the friction body 3 is grounded, the charge transferred from the dust collection body 2 to the friction body 3 when the dust collection body 2 is rubbed can be released to the ground electrode. Therefore, the friction member 3 can be prevented from being charged and saturated, and the dust collection member 2 can be efficiently charged.

  Furthermore, in the first embodiment, the dust collection body 2 is sandwiched and rubbed by the plurality of friction bodies 3 grounded. When the dust collection body 2 is sandwiched and rubbed by a plurality of friction bodies 3, when viewed microscopically, a gap is instantaneously generated between the friction body 3 and the dust collection body 2 along with the movement of the friction body 3. Sometimes. Here, with respect to the two friction bodies 3 sandwiching the dust collection body 2, there is a case where a gap is generated between one friction body 3 and the dust collection body 2 and the other friction body 3 and the dust collection body 2 contact. Think. At this time, since one of the friction members 3 is electrically connected to the ground electrode as described above, it can be regarded as a ground conductor, and a capacitor is inserted in the gap between the ground conductor and the dust collector 2. As a result, the capacitance of the dust collector 2 instantaneously and partially increases.

  Here, in an air path sandwiched between the ground conductor and the dust collecting body 2, assuming an ideal capacitor, the surface potential V [V] of the dust collecting body, the charge amount Q of the dust collecting body Q [C], The relationship between the capacitance C [F] of the dust collecting body can be expressed by the following equation.

  As represented by the equation (1), when the capacitance C increases, the charge amount Q that can be stored by the dust collection body increases. The dust collecting body 2 obtains a larger charge amount by rubbing the dust collecting body 2 with the other friction body 3 in a state where the partial capacitor as described above is formed and the capacitance C is increased. Can.

  The formation of a partial capacitor as described above is instantaneous, and disappears with the movement of the friction body 3, but even if one capacitor disappears, it will occur at another place with the movement of the friction body 3 New capacitors are formed, and formation of similar capacitors is repeated many times. Then, even if the partial capacitor disappears, the electrostatic charge on the surface of the dust collection body 2 applied in the state of increased capacitance is not immediately lost, so the dust collection body 2 holds a large charge amount. Can. Thereby, an electrostatic field is formed in the vicinity of the surface of the dust collection body 2 with high electric field strength. The coulomb force and the gradient force work more strongly as the electric field strength is higher, and therefore, as the charge amount is increased as described above, more particles in the air can be collected.

  In the present embodiment, an example is shown in which both of the two friction members 3 sandwiching the dust collecting body 2 are grounded, but the present invention is not limited thereto, and at least one may be grounded. If at least one is grounded, it is possible to obtain the effect of increasing the charge amount as described above. Further, it is also possible to replace the one friction body 3 with a ground conductor made of a metal block or the like (for example, a stainless steel block), and sandwich the dust collection body 2 by the ground conductor and the friction body 3 for friction.

  Further, the dust collection device 1 of the present embodiment may be used alone, but may be incorporated into an air conditioner or the like provided with a blower that generates an air flow passing through the air passage 20, for example. is there.

Second Embodiment
The dust collection device of the second embodiment is the same as the first embodiment except for the structure of the dust collection body 2 which is different from that of the first embodiment. The following description will focus on different parts.

  The principal part of the dust collection device by Embodiment 2 is shown in FIG. The dust collection device of the second embodiment includes, as the dust collection body 2, a first dust collection body 22 that is positively charged by friction with the friction body 3, and a second dust collection body 23 that is negatively charged. ing. Of the dust collecting bodies 2 disposed to face each other, one is a first dust collecting body 22 and the other is a second dust collecting body 23. An example of the first dust collection body 22 that is positively charged is polyamide (PA 6) that has a strong tendency to frictionally charge to the positive side, and an example of the second dust collection body 23 that is negatively charged to have a frictional charge that is negative Strong polypropylene (PP) is mentioned. In addition, when there are three or more dust collectors in total, the method of arrangement of the first dust collector 22 and the second dust collector 23 is not particularly limited, and the first dust collector 22 and the second dust collector 22 are not particularly limited. The dust collecting bodies 23 may be alternately arranged, or may be replaced with each other, or the number of any one may be increased.

  When the friction body 3 is moved by the drive unit 4 and the first dust collecting bodies 22 and 23 are rubbed, the first dust collecting body 22 is positively charged, and the second dust collecting body 23 is negatively charged.

  Generally, when the dust collection body is positively charged, negatively charged particles are collected among particles to be collected in the air, and the dust collection body is negatively charged. The positively charged particles are collected. When a plurality of dust collectors 2 are configured with only one type of dust collector, either positive or negative, the collected particles are also biased either positive or negative, and the other particles are sufficiently captured. I can not collect.

  On the other hand, the dust collection device according to the second embodiment includes both the positively charged dust collector and the negatively charged dust collector, so the first negatively charged particles are positively charged. It is possible to collect on the dust collection body 22 and to collect the positively charged particles on the negatively charged second dust collection body 23, and the particles to be collected are charged in either Also, since it is easy to collect, a high collection rate can be obtained as compared with the case where only one type of dust collector is used.

  Further, the average electric field intensity E [V / m] in the air passage 20 sandwiched between the first dust collection body 22 charged positively and the second dust collection body 23 negatively charged is expressed by the following formula (2) Is represented.

Here, the charging density of the first dust collecting member 22 [rho ₊ is to positively charged ^{[C / m 2], ρ} - the charge density of the second dust collecting body 23 that is negatively charged [C / m ^2] , Ε ₀ is the dielectric constant 8.85 × 10 ⁻¹² [F / m] of vacuum.

As shown in the above equation (2), as the charge density _{+ + of} the first dust collector 22 charged positively and the charge density _{− − of} the second dust collector 23 charged negatively are larger, the air passage The average electric field strength E at 20 is increased to obtain a high electrostatic collection rate. Incidentally, according to the equation (2), when the dust collecting bodies 2 made of the same material are arranged opposite to each other, the average electric field strength is theoretically zero, but in fact the charge amount on the surface of the dust collecting body depends on the place Because of the variability that results in the field strength, there is actually a constant average field strength.

  As described above, in the dust collection device according to the second embodiment, since the first dust collection body 22 charged positively and the second dust collection body 23 negatively charged are disposed to face each other, one type of dust collection device can be used. Compared to the case where only the dust collecting body is used, the particles to be collected are more easily collected regardless of whichever the particles are charged, so a higher collection rate can be obtained. In addition, the average electric field strength in the air passage 20 can be increased, and a higher collection rate can be obtained.

Third Embodiment
The dust collection device of the third embodiment is the same as the first embodiment except for the configuration of the friction body 3 which is different from that of the first embodiment. The following description will focus on different parts.

  The principal part of the dust collection device of Embodiment 3 is shown in FIG. In the dust collection device of the third embodiment, the friction body 3 includes a first friction material 33 which is negatively charged by friction with the dust collection body 2 and a second friction material 34 which is positively charged. The first friction material 33 and the second friction material 34 rub one of the dust collecting bodies 2 facing each other across the air passage 20 by the first friction material 33, and the other is caused by the second friction material 34. It is arranged to rub. Further, when one dust collecting body 2 is sandwiched and rubbed by a plurality of friction bodies, the same kind of friction material is used to rub the one dust collecting body 2. In addition, although what equipped both the 1st friction material 33 and the 2nd friction material 34 in one friction body 3 was shown in FIG. 8, not only this but only the 1st friction material 33 is shown. The friction body 3 provided with only the second friction material 34 and the friction body 3 provided only with the second friction material 34 may be appropriately combined and disposed.

  The dust collector 2 rubbed by the first friction member 33 is charged positively, and the dust collector 2 rubbed by the second friction member 34 is negatively charged. As a result, one of the dust collecting bodies 2 disposed opposite to each other is positively charged, and the other is negatively charged, so in the same manner as in the second embodiment, regardless of whether the particles to be collected are charged. It becomes easy to collect, and the average electric field strength in the air passage 20 can be increased, and a higher collection rate can be obtained.

  Furthermore, as in the second embodiment, the first dust collection body 22 and the second dust collection body 23 may be used as the dust collection bodies 2. At this time, the first friction member 33 negatively charged is the first dust collector 22 positively charged, and the second friction member 34 positively charged is the second dust collector 23 negatively charged. Let it rub. Thereby, each dust collection body can be charged more efficiently.

  Further, as shown in FIG. 8, it is preferable to configure one friction body 3 by combining the first friction material 33 that is negatively charged and the second friction material 34 that is positively charged. Specifically, the first friction material 33 is provided on one side of the core material 31 and the second friction material 34 is provided on the opposite side. When the friction body 3 having both the first friction material 33 and the second friction material 34 is moved, the dust collection body rubbed by the first friction material 33 becomes positively charged, and the second friction material The dust collected at 34 is negatively charged. As a result, only by using one friction body 3, one of the dust collection bodies 2 disposed opposite to each other can be positively charged and the other can be negatively charged.

  Further, in this case, the first friction material 33 is negatively charged and the second friction material 34 is positively charged due to the friction with the dust collection body 2, but the first friction material 33 and the second friction material are charged. 34 is disposed across the core 31 which is a conductor, and since the positive charge of the first friction material 33 and the negative charge of the second friction material 34 cancel each other, the friction body 3 is in the charge saturation state Can be suppressed, and the dust collection body 2 can be efficiently frictionally charged.

Fourth Embodiment
The dust collection device according to the fourth embodiment differs from the first embodiment in that the dust collecting device according to the fourth embodiment includes drying means 6 for drying the dust collection body 2 and the other points are the same as those in the first embodiment. The following description will focus on different parts.

  FIG. 9 is a perspective view showing the main part of the dust collection device of the fourth embodiment, and FIGS. 10 and 11 are side views. The dust collection device of the fourth embodiment includes drying means 6 for drying the dust collection body 2 before the dust collection body 2 is rubbed with the friction body 3. The drying means 6 is held by the holder 43 in the same manner as the friction body 3. As the drying means 6, for example, a metal plate-like hot wire heater is used.

  When the dust collection body 2 is frictionally charged, the drive shaft 42 is rotated by the operation of the drive means 41, and the friction body 3 and the drying means 6 are moved via the holding body 43 screwed thereto. At this time, before the dust collecting body 2 is rubbed by the friction body 3, the metal plate which is the drying means 6 is heated to, for example, 80.degree. C. and passed while being in contact with the dust collecting body 2. The surface moisture can be evaporated and dried. Since the surface resistance of the dust collection body 2 is increased by drying the surface of the dust collection body 2, the friction effect at the time of friction with the friction body 3 is enhanced, and the dust collection body 2 can be charged more efficiently. it can. Also, as a result, a high frictional charging effect can be obtained stably without being influenced by the humidity of the atmosphere.

  The temperature of the drying means 6 is not limited to 80 ° C., and may be a temperature lower than the melting point of the dust collecting body 2. A higher temperature is preferable because the dust collection body 2 can be efficiently dried.

  In the fourth embodiment, an example is shown in which the friction body 3 and the drying means 6 are held side by side on one holding body 43. However, a plurality of holding bodies 43 may be provided. 3. The drying means 6 may be held by another holder.

  Further, the type of the drying means 6 is not limited to the metal plate heater, and other heating means or drying means other than heating may be used. In addition, it is not essential to hold the drying means 6 on the holder 43, for example, sending hot air with a dryer toward the surface of the dust collector 2, or a compressor-type or desiccant-type dehumidifier in a space outside the air path. The dust collecting body 2 may be dried by blowing air or the like. In any case, the dust collecting body 2 is configured to be dried by the drying means 6 before the dust collecting body 2 is rubbed by the friction body 3.

  As described above, according to the fourth embodiment, the surface resistance of the dust collection body 2 can be reduced by drying the dust collection body 2 by the drying means 6 before rubbing the dust collection body 2 with the friction body 3. By increasing the friction effect, the dust collection body 2 can be charged more efficiently.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to this. Within the scope of the invention, it is possible to freely combine each embodiment and its modification, and to appropriately modify or omit each embodiment.

1 Dust collection device,
2 Dust collection body,
20 windways,
21 projections,
22 first dust collection body,
23 second dust collector,
3 friction body,
31 core material,
32 friction material,
33 1st friction material,
34 second friction material,
4 drive units,
41 driving means,
42 drive shafts,
43 holder,
5 shell,
51 inlets,
52 outlets,
6 Drying means

The dust collection device according to the present invention is
A plurality of frictionally charged dust collectors spaced from one another so as to form an air passage through which air passes;
And at least one friction body for charging the dust collection body by friction.
At least one of the dust collection body facing each other across the air passage, possess one or more projections projecting toward the air passage,
The friction body may move in a direction transverse to the flow of the air in the air passage to rub the dust collection body .

The dust collection body 2 is formed of a material that generates static electricity and is charged by friction with the friction body 3. On the surface of the Atsumarichiritai 2, collision raised portion 21 is provided that protrudes toward the air passage 20. The number of protrusions 21 is not limited, and may be one or more. In addition, the protrusion 21 may be provided on only one of the dust collecting bodies 2 facing each other with the air passage 20 interposed therebetween, or may be provided on both.

The drive unit 4 includes drive means 41 such as a motor, a drive shaft 42 having a spiral groove on the outer surface, and a holder 43 for holding the friction member 3. The holder 43 is in threaded engagement with the drive shaft 42, and the drive shaft 42 is connected to the drive means 41. The drive shaft 42 is rotated by the rotation of the drive means 41, and the holding body 43 screwed to this is moved, whereby the plurality of friction bodies 3 held by the holding body 43 are moved. Rub the surface. The drive shaft 42 is orthogonal to the direction of the air flow flowing through the air passage 20 and the direction in which the protrusions 21 are disposed.

The shape of the projection 21 is not limited to a plate, and may be a bowl, a fiber (for example, a pile of piles), a wave, or any other shape, through which the air passing through the air passage 20 passes. it can be disposed along the. The shape example of collision raised portion 21 shown in Figures 3-5. In particular, in the case of the bowl-like or fibrous form as shown in FIG. 4, the number of the projections serving as the source of the uneven electric field increases, so the induction of the gradient force is promoted and the particle collection rate is further enhanced. ,preferable.

Also, the protrusion 21 has flexibility. Thereby, when moving the friction body 3 to rub the surface of the dust collection body 2, as shown in FIG. 6 , the protrusion 21 is pushed by the friction body 3 and falls down, and the friction body 3 moves on that Therefore, the movement of the friction body 3 is not hindered. As shown in FIG. 6, after passing over the friction member 3 of the protrusion 21 which fell dramatically, the protrusion 21 returns to a state of extending toward the air passage 20 as the source. As a result, interference between the protrusion 21 and the friction member 3 can be suppressed, and the surface of the dust collection member 2 can be efficiently rubbed and charged.

When the friction body 3 is moved by the drive unit 4 to rub the first dust collection body 22 and the second dust collection body 23, the first dust collection body 22 is positively charged, and the second dust collection body 23 is Charge negatively.

Claims (11)

A plurality of frictionally charged dust collectors spaced from one another so as to form an air passage through which air passes;
And at least one friction body for charging the dust collection body by friction.
At least one of the dust collecting bodies facing each other across the air passage has at least one protrusion projecting toward the air passage.
Dust collection device. The protrusion is disposed along a passing direction of the air in the air passage.
The dust collection device according to claim 1. The protrusion is flexible,
The dust collection device according to claim 1 or 2. The friction body moves in a direction transverse to the flow of air in the air passage to rub the dust collection body.
The dust collection device according to any one of claims 1 to 3. The friction body is grounded.
The dust collection device according to any one of claims 1 to 4. A pair of the friction members which sandwich and rub the dust collection body, and at least one of the pair of friction members is grounded;
The dust collection device according to claim 5. Among the dust collecting bodies facing each other across the air passage, one dust collecting body is a first dust collecting body which is positively charged by friction with the friction body, and the other dust collecting body is the friction It is a second dust collector that is negatively charged by friction with the body,
The dust collection device according to any one of claims 1 to 6. At least one of the friction bodies has a first friction material that rubs one of the dust collection bodies facing each other across the air passage and negatively charges due to the friction with the dust collection body, And, at least one of the friction bodies has a second friction material that rubs against the other of the dust collecting bodies facing each other across the air passage, and is positively charged by the friction with the dust collecting bodies. ,
The dust collection device according to any one of claims 1 to 6. The friction body is a first friction material that rubs one of the dust collection bodies facing each other across the air passage, and negatively charges due to the friction with the dust collection body, and the other friction material Having both a dust collecting body and a second friction material positively charged by the friction with the dust collecting body,
The dust collection device according to any one of claims 1 to 6. A drying means is provided to dry the dust collection body before the dust collection body is rubbed by the friction body.
The dust collection device according to any one of claims 1 to 9. The dust collection device according to any one of claims 1 to 10,
An air conditioner comprising: an air blower generating an air flow passing through the air passage.

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