JP6233590B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner and the like.

  For example, as disclosed in Patent Document 1, a prefilter is generally incorporated in an air conditioner. The prefilter removes dust from the airflow.

Japanese Patent No. 4270234

  Dust that is larger than the mesh of the prefilter is caught by the mesh sheet of the prefilter. On the other hand, fine particles such as dust smaller than the mesh pass through the mesh sheet. If the mesh of the mesh sheet is miniaturized, the cleanliness of the airflow passing through the mesh sheet increases, but the airflow resistance of the airflow increases and the cooling and heating capacity of the air conditioner decreases.

  According to some aspects of the present invention, an air conditioner that can increase the cleanliness of airflow without increasing ventilation resistance can be provided.

One form of the present invention, a casing that forms a passage for airflow, a charging electrode that is disposed in the passage and discharges into the airflow to charge a substance in the airflow, is connected in a ring and is continuous, Formed by an insulating mesh sheet having a first part and a second part that cross the passage before and after the flow direction of the airflow, and at least on the opposite side of the first surface that receives the airflow at the first part upstream. have a conductive material formed on the second surface, with the second portion of the downstream side, the charging electrode of the same polarity electrical of a conductive material which is opposed to the conductive material of the first portion of the upstream The present invention relates to an air conditioner including a filter that forms a barrier and a ground terminal that is formed in the filter and connects a ground to the conductive material.

  When discharge is performed from the charging electrode, substances such as dust in the airflow are charged with a specific polarity. Dust larger than the mesh of the mesh sheet is caught by the mesh sheet. Fine particles such as dust that are charged and smaller than the mesh adhere to the conductive material of the filter whose polarity is ground. Thus, not only dust larger than the mesh but also fine particles smaller than the mesh are captured by the filter. The mesh sheet is a combination of resin fibers in a lattice shape, and the pressure loss of the filter mesh sheet is remarkably suppressed. The filter can capture fine particles effectively while avoiding pressure loss. The cleanliness of the airflow can be increased without increasing the airflow resistance of the airflow.

  At this time, when the fine particles adhere to the conductive material of the filter, electric charges are exchanged between the fine particles and the ground. The charged state of the conductive material is eliminated. Thus, it is possible to prevent the filter from having the same polarity as that of the charging electrode. Even if the adhesion amount of fine particles increases, new fine particles can reliably adhere to the filter. If a path for exchanging electric charges with the ground is not provided in the filter, a potential having the same polarity as that of the charged electrode is generated on the filter as the amount of adhering charges increases, and fine particles are generated according to the repulsive force having the same polarity. Adhesion is hindered.

Filter is formed of a mesh sheet having a first portion and a second portion crossing the passage before and after the flowing direction of the airflow. The airflow successively passes through a plurality of mesh sheets arranged in the flow direction. Compared with a single mesh sheet, the probability that the charged fine particles adhere to the conductive material increases. On the other hand, the ventilation resistance of the mesh sheet is small. The cleanliness of the airflow can be increased without increasing the airflow resistance of the airflow.

The mesh sheets are connected in an annular shape and are continuous. Therefore, the mesh sheet can move around the track.

By applying a voltage to the conductive material facing the conductive material of the upstream first part at the downstream second part, an electrical barrier having the same polarity as the charging electrode is formed upstream of the second part. It is formed. When discharging is performed from the charging electrode, fine particles such as dust in the air current are charged with a specific polarity. The airflow then passes through a pair of mesh sheets one after the other. The charged fine particles collide with the electrical barrier even if they pass on the airflow and pass through the mesh of the mesh sheet of the first portion on the upstream side. Since the charged fine particles and the electric barrier have the same polarity, the charged fine particles are rebounded by the electric barrier. As a result, the traveling speed of the fine particles is reduced and the traveling direction is reversed, and the charged fine particles easily adhere to the conductive material of the mesh sheet at the second portion. In this way, the air conditioner can capture fine particles effectively while avoiding pressure loss.

Message Shushito the Ru is formed of an insulating material. At this time, the first surface of the mesh sheet of the first portion of the upper stream side is arranged an insulating material, opposite to the surface that is opposed to the first site upstream side in the second portion of the mesh sheet of the lower stream side insulation material surface is Ru is located. When the mesh sheets are sequentially arranged along the flow direction of the airflow, the conductive material on the downstream mesh sheet is opposed to the conductive material on the upstream mesh sheet. Thus, the conductive materials of the mesh sheet are disposed between the insulating materials. The user can be prevented from coming into direct contact with the conductive material supplied with the high voltage from the outside.

The conductive material of the first part only needs to face the conductive material of the second part at equal intervals. In this way, the electrical barrier can suppress the bias of the potential distribution as much as possible. As a result, the fine particles can uniformly adhere to the dust collecting electrode. Since the fine particles are not unevenly distributed on the filter, the fine particles can be efficiently captured in the entire portion facing the downstream mesh sheet of the upstream mesh sheet.

  As described above, according to the disclosed air conditioner, the cleanliness of the airflow can be increased without increasing the airflow resistance of the airflow.

It is a conceptual diagram which shows roughly the structure of the air conditioner which concerns on one Embodiment of this invention. It is a perspective view which shows roughly the external appearance of the indoor unit which concerns on 1st Embodiment. It is a perspective view which shows the structure of the main body of an indoor unit schematically. It is a disassembled perspective view which shows the structure of an indoor unit schematically. It is an expansion perspective view showing the structure of an air filter roughly. It is an expansion vertical sectional view of the main part of an indoor unit. It is an expanded sectional view showing roughly the principle of electric dust collection about the indoor unit concerning a 2nd embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

(1) Configuration of Air Conditioner FIG. 1 schematically shows a configuration of an air conditioner 11 according to an embodiment of the present invention. The air conditioner 11 includes an indoor unit 12 and an outdoor unit 13. The indoor unit 12 is installed in an indoor space in a building, for example. In addition, the indoor unit 12 may be installed in a space corresponding to the indoor space. An indoor heat exchanger 14 is incorporated in the indoor unit 12. The outdoor unit 13 includes a compressor 15, an outdoor heat exchanger 16, an expansion valve 17, and a four-way valve 18. The indoor heat exchanger 14, the compressor 15, the outdoor heat exchanger 16, the expansion valve 17 and the four-way valve 18 form a refrigeration circuit 19.

  The refrigeration circuit 19 includes a first circulation path 21. The first circulation path 21 connects the first port 18a and the second port 18b of the four-way valve 18 to each other. A compressor 15 is provided in the first circulation path 21. The suction pipe 15a of the compressor 15 is connected to the first port 18a of the four-way valve 18 via a refrigerant pipe. The gas refrigerant is supplied to the suction pipe 15a of the compressor 15 from the first port 18a. The compressor 15 compresses the low-pressure gas refrigerant to a predetermined pressure. The discharge pipe 15b of the compressor 15 is connected to the second port 18b of the four-way valve 18 via a refrigerant pipe. Gas refrigerant is supplied from the discharge pipe 15 b of the compressor 15 to the second port 18 b of the four-way valve 18. The refrigerant pipe may be a copper pipe, for example.

  The refrigeration circuit 19 further includes a second circulation path 22. The second circulation path 22 connects the third port 18c and the fourth port 18d of the four-way valve 18 to each other. The outdoor heat exchanger 16, the expansion valve 17, and the indoor heat exchanger 14 are incorporated into the second circulation path 22 in order from the third port 18c side. The outdoor heat exchanger 16 exchanges heat energy between the refrigerant passing therethrough and ambient air. The indoor heat exchanger 14 exchanges thermal energy between the refrigerant passing therethrough and ambient air. The second circulation path 22 may be formed by a refrigerant pipe such as a copper pipe.

  A blower fan 23 is incorporated in the outdoor unit 13. The blower fan 23 ventilates the outdoor heat exchanger 16. The blower fan 23 generates an air flow according to the rotation of the impeller, for example. The airflow passes through the outdoor heat exchanger 16. The flow rate of the airflow passing through is adjusted according to the rotational speed of the impeller.

  A blower fan 24 is incorporated in the indoor unit 12. The blower fan 24 ventilates the indoor heat exchanger 14. The blower fan 24 generates an air flow according to the rotation of the impeller. Indoor air is sucked into the indoor unit 12 by the action of the blower fan 24. The indoor air passes through the indoor heat exchanger 14 and exchanges heat with the refrigerant. The heat-exchanged cold air or warm air flow is blown out from the indoor unit 12. The flow rate of the airflow passing through is adjusted according to the rotational speed of the impeller.

When the cooling operation is performed in the refrigeration circuit 19, the four-way valve 18 connects the second port 18b and the third port 18c to each other and connects the first port 18a and the fourth port 18d to each other. Therefore, high-temperature and high-pressure refrigerant is supplied to the outdoor heat exchanger 16 from the discharge pipe 15 b of the compressor 15. The refrigerant flows through the outdoor heat exchanger 16, the expansion valve 17, and the indoor heat exchanger 14 in order. The outdoor heat exchanger 16 radiates heat from the refrigerant to the outside air. The refrigerant is decompressed to a low pressure by the expansion valve 17. The decompressed refrigerant absorbs heat from the surrounding air in the indoor heat exchanger 14. Cold air is generated. The cold air is blown out into the indoor space by the function of the blower fan 24.

When the heating operation is performed in the refrigeration circuit 19, the four-way valve 18 connects the second port 18b and the fourth port 18d to each other and connects the first port 18a and the third port 18c to each other. A high-temperature and high-pressure refrigerant is supplied from the compressor 15 to the indoor heat exchanger 14. The refrigerant flows through the indoor heat exchanger 14, the expansion valve 17, and the outdoor heat exchanger 16 in order. The indoor heat exchanger 14 radiates heat from the refrigerant to the surrounding air. Warm air is generated. Warm air is blown into the indoor space by the function of the blower fan 24. The refrigerant is decompressed to a low pressure by the expansion valve 17. The decompressed refrigerant absorbs heat from the surrounding air in the outdoor heat exchanger 16. Thereafter, the refrigerant returns to the compressor 15.

(2) Configuration of Indoor Unit According to First Embodiment FIG. 2 schematically shows the appearance of the indoor unit 12 according to the first embodiment. An outer panel 27 covers the main body (housing) 26 of the indoor unit 12. An air outlet 28 is formed on the lower surface of the main body 26. The blower outlet 28 is opened toward the room. The main body 26 can be fixed to an indoor wall surface, for example. The blower outlet 28 blows out the cool air or the warm air generated by the indoor heat exchanger 14.

A pair of front and rear wind direction plates 31a and 31b are arranged at the outlet 28. The up-and-down wind direction plates 31a and 31b can rotate around the horizontal axes 32a and 32b, respectively. The vertical airflow direction plates 31a and 31b can open and close the air outlet 28 according to the rotation. The direction of the airflow to be blown out is changed according to the angle of the up / down airflow direction plates 31a, 31b.

  As shown in FIG. 3, a suction port 33 is formed in the main body 26. The suction port 33 opens at the front and top surfaces of the main body 26. The outer panel 27 can be covered with the suction port 33 in front of the main body 26. Air flowing into the indoor heat exchanger 14 is taken in from the suction port 33.

  A plurality of air filter assemblies 34 having the same shape are arranged in the suction port 33 over the longitudinal direction of the suction port 33. The air filter assembly 34 includes an air filter (filter) 35 and a holding portion 36. The air filter 35 is held by the holding unit 36. The holding part 36 has a frame body 37. The holding part 36 is fixed to the main body 26 by a frame body 37. When the holding portion 36 is set on the main body 26, the air filter 35 is disposed over the entire surface of the suction port 33.

  As shown in FIG. 4, the blower fan 24 is rotatably supported by the main body 26. For example, a cross flow fan is used as the blower fan 24. The blower fan 24 can rotate around a rotation shaft 38 parallel to the horizontal axes 32a and 32b. The rotating shaft 38 of the blower fan 24 extends in the horizontal direction when the main body 26 is installed. The blower fan 24 is disposed in parallel with the air outlet 28. A driving force around the rotary shaft 38 is transmitted to the blower fan 24 from a driving source (not shown). The drive source is supported by the main body 26. The airflow passes through the indoor heat exchanger 14 according to the rotation of the blower fan 24. As a result, a cold or warm air stream is generated. Cold air or warm air is blown out from the air outlet 28.

  The indoor heat exchanger 14 includes a front side body 14a and a rear side body 14b. The front body 14 a covers the blower fan 24 from the front side of the blower fan 24. The rear body 14 b covers the blower fan 24 from the rear side of the blower fan 24. The front body 14a and the rear body 14b are connected to each other at the upper end. The front side body 14 a and the rear side body 14 b have a refrigerant pipe 39. The refrigerant pipe 39 reciprocates in the horizontal direction. That is, the refrigerant pipe 39 extends parallel to the horizontal axes 32a and 32b, is folded at the left and right ends of the main body 26 when viewed from the front, extends again parallel to the horizontal axes 32a and 32b, and is folded again at the left and right ends of the main body 26 when viewed from the front. These are repeated. The refrigerant pipe 39 constitutes a part of the second circulation path 22. A plurality of heat radiation fins 41 are coupled to the refrigerant pipe 39. The radiating fins 41 extend in parallel to each other while being orthogonal to the horizontal axes 32a and 32b. The refrigerant pipe 39 and the radiation fins 41 can be formed from a metal material such as copper or aluminum. Heat exchange is realized between the refrigerant and the air through the refrigerant pipe 39 and the radiation fins 41.

  As shown in FIG. 4, a filter cleaning unit 43 and an electrostatic dust collection unit 44 are associated with the air filter assembly 34. The filter cleaning unit 43 includes a dust box 45. The dust box 45 is supported by the main body 26, for example. When the dust box 45 and the air filter assembly 34 are set in the main body 26, the air filter 35 is opposed to the dust box 45 at the lower end of the air filter assembly 34. The dust box 45 is disposed in the horizontal direction with respect to the air filter 35. When the air filter 35 is cleaned, dust in the air filter 35 is collected in the dust box 45.

  The filter cleaning unit 43 includes a first driven gear 46 and a second driven gear 47. The first driven gear 46 is attached to the holding portion 36 of the air filter assembly 34. The first driven gear 46 rotates around the horizontal axis 48. The first driven gear 46 is disposed outside the holding portion 36. When the air filter assembly 34 is set on the main body 26, the first driven gear 46 meshes with a first drive gear (not shown) mounted on the main body 26. A drive source (not shown) such as an electric motor is connected to the first drive gear. The first driven gear 46 rotates according to the driving force supplied from the driving source.

  The second driven gear 47 is attached to the dust box 45. The second driven gear 47 rotates around the horizontal axis 49. The teeth of the second driven gear 47 are at least partially exposed from the outer surface of the dust box 45. The second driven gear 47 meshes with a second drive gear (not shown) mounted on the main body 26. A drive source (not shown) such as an electric motor is connected to the second drive gear. The second driven gear 47 rotates according to the driving force supplied from the driving source.

  The electric dust collection unit 44 includes an ionizer 51. The ionizer 51 is fixed to, for example, the frame 37 of the holding unit 36 on the front surface of the air filter assembly 34. The casing 52 of the ionizer 51 may be integrated with the frame body 37. Openings 53 are formed in the casing 52 of the ionizer 51 in the vertical direction. Ions and ozone are emitted from the opening 53. The released ions and ozone diffuse into the space between the outer panel 27 and the air filter 35. The ionizer 51 is electrically connected to a control unit (not shown) in the main body 26 by wiring (not shown). The wiring of the ionizer 51 has a detachable electrical contact. When the air filter assembly 34 is attached and detached, the wiring is coupled and divided. Operating power is supplied to the ionizer 51 through the wiring.

  As shown in FIG. 5, the air filter 35 includes a band 55 and a mesh sheet 56. The mesh sheet 56 is configured by combining polyethylene terephthalate fibers (resin fibers) in a lattice pattern, for example. The mesh sheet 56 is supported by the belt body 55. The band 55 holds the left and right sides of the mesh sheet 56. The band body 55 and the mesh sheet 56 constitute an insulator 57. The mesh of the mesh sheet 56 is provided so as to intersect with the air current, and defines a ventilation path.

  The belt body 55 and the mesh sheet 56 have flexibility. The belt body 55 and the mesh sheet 56 are formed in an annular shape. The belt 55 and the mesh sheet 56 are wound around a roller shaft 58 and a plurality of thin shafts 59a and 59b. The roller shaft 58 and the thin shafts 59 a and 59 b are supported by the frame body 37 of the holding unit 36. The shape of the mesh sheet 56 is maintained by the action of the roller shaft 58 and the thin shafts 59a and 59b. The mesh sheets 56 are doubled between the roller shaft 58 and the thinnest shaft 59a at the uppermost end. In this way, a pair of front and rear mesh sheets 61a and 61b is established. The band 55 is connected to the cylindrical surface of the roller shaft 58 with a large frictional force, for example. As a result, when the roller shaft 58 rotates, the mesh sheet 56 can move along a single track. Thus, the relative movement of the mesh sheet 56 with respect to the dust box 45 is realized. The track of the mesh sheet 56 is defined by a roller shaft 58 and thin shafts 59a and 59b. The first driven gear 46 described above is fixed to the roller shaft 58.

  A conductive material film is formed on the surface of the mesh sheet 56. For example, a metal material such as aluminum can be used as the conductive material. The coating is laminated on the surface of the insulator 57. For example, sputtering may be used to form the coating. The air passage that penetrates in the air flow direction is secured as it is.

  A ground terminal 62 is formed on the band 55. The ground terminal 62 is continuous from the coating. When the air filter assembly 34 is set on the main body 26, the ground terminal 62 is connected to the ground of the main body 26. For such connection, the main body 26 may be provided with an electrical contact (not shown) that contacts the ground terminal 62. The potential of the film from the contact point may be dropped to the ground. An electrical contact that contacts the ground terminal 62 may be formed on the frame 37 of the holding portion 36, and in that case, a wiring extending from the contact of the frame 37 may be connected to the contact on the main body 26. .

  As shown in FIG. 6, the filter cleaning unit 43 includes a cleaning brush 64. The cleaning brush 64 is stored in the dust box 45. The cleaning brush 64 includes a brush pedestal 65. The brush pedestal 65 can rotate around a horizontal axis 66. The brush bristles 67 are arranged on a cylindrical surface of the brush pedestal 65 over a predetermined center angle range. The flocking range of the brush bristles 67 extends across the air filter 35 in the axial direction of the brush pedestal 65. The cleaning brush 64 contacts the brush hair 67 with the air filter 35 at a predetermined rotational position, and separates the brush hair 67 from the air filter 35 at other than the rotational position. When the air filter 35 moves in a direction along a vertical plane orthogonal to the horizontal axes 32 a and 32 b in a state where the brush bristles 67 are in contact with the air filter 35, dust adhering to the front surface of the air filter 35 is entangled with the bristles 67. Can be done. The entangled dust is collected in the dust box 45.

  The ionizer 51 of the electric dust collection unit 44 has a charging electrode 68. The charging electrode 68 is supplied with a high voltage from the charging electrode high-voltage power source 69 of the main body 26 and is discharged into the air. Ions and ozone are generated by the discharge. The ions and ozone thus generated are emitted from the opening 53 of the ionizer 51.

  Inside the main body 26, an airflow passage 71 is formed from the suction port 33 toward the blowout port 28. The indoor heat exchanger 14 is disposed in the passage 71. An air filter 35 is disposed upstream of the indoor heat exchanger 14 along a cross section 72 (crossing from the rear end side of the upper surface of the suction port 33 to the lower side of the entire surface) across the passage 71. An ionizer 51 is disposed on the upstream side of the air filter 35.

(3) Operation of the indoor unit When the blower fan 24 is operated during normal cooling operation or heating operation, an air flow is generated along the passage 71 from the inlet 33 toward the outlet 28 in the main body 26. The air sucked from the suction port 33 passes through the air filter 35 and passes through the indoor heat exchanger 14. The indoor heat exchanger 14 performs heat exchange between the airflow and the refrigerant. During the cooling operation, the air is cooled by the indoor heat exchanger 14 and blown out from the outlet 28. During the heating operation, the air is warmed by the indoor heat exchanger 14 and blown out from the outlet 28. In this way, cold air and warm air are generated.

  When the airflow passes through the air filter 35, dust larger than the mesh size of the mesh sheet 56 cannot pass through the mesh. Large dust is captured on the front surface of the air filter 35. On the other hand, when discharge is performed from the charging electrode 68, fine particles such as dust in the air current are charged with a specific polarity. The charged fine particles adhere to the conductive material on the mesh sheet 56 by Coulomb force. Thus, not only dust larger than the mesh but also fine particles smaller than the mesh are captured by the air filter 35. In the mesh of the so-called mesh sheet 56, the opening spread can be set larger than the length of the flow path of the air flow. As a result, the pressure loss of the mesh sheet 56 of the air filter 35 is significantly suppressed. The air filter 35 can capture fine particles effectively while avoiding pressure loss. The cleanliness of the airflow can be increased without increasing the airflow resistance of the airflow. Here, the airflow passes through the front mesh sheet 61a and the rear mesh sheet 61b one after another. Therefore, the probability that the charged fine particles adhere to the film of the conductive material is increased as compared with one mesh sheet. On the other hand, the ventilation resistance of the mesh sheet 56 is small. The cleanliness of the airflow can be increased without increasing the airflow resistance of the airflow. Instead of the pair of front and rear mesh sheets 61a and 61b, a mesh sheet 56 arranged in series in the air flow direction may be used.

  At this time, if the fine particles adhere to the conductive material of the air filter 35, electric charges are exchanged between the fine particles and the ground. The charged state of the fine particles is eliminated. Thus, the air filter 35 can be prevented from having the same polarity as the charging electrode 68. Even if the adhesion amount of fine particles increases, new fine particles can reliably adhere to the conductive material on the air filter 35. Here, although the polarity of the air filter 35 as the dust collecting electrode is the ground, it is sufficient if it has a polarity to which the fine particles can be attached, and may have a polarity opposite to the fine particles, that is, a negative polarity. .

  When the air filter 35 is cleaned, the filter cleaning unit 43 operates. The brush bristles 67 of the cleaning brush 64 come into contact with the front surface of the air filter 35 in accordance with the rotation operation of the brush base 65. At this time, the mesh sheet 56 is received by the roller shaft 58. The mesh sheet 56 is sandwiched between the brush bristles 67 and the roller shaft 58. When the first driven gear 46 is driven, movement of the mesh sheet 56 is caused on the track. The relative movement of the mesh sheet 56 with respect to the brush bristles 67 and the roller shaft 58 is realized in a direction along a vertical plane orthogonal to the horizontal axis lines 32a and 32b. The bristles 67 trace the front surface of the mesh sheet 56 according to the relative movement. Thus, the bristles 67 entangle large dust from the front surface of the mesh sheet 56. The entangled dust is collected in the dust box 45.

(4) Configuration of Indoor Unit According to Second Embodiment FIG. 7 schematically shows the principle of electric dust collection in the indoor unit 12 according to the second embodiment. In the second embodiment, the air filter 35 has a pair of front and rear mesh sheets 61a and 61b, as in the first embodiment. The mesh sheets 61a and 61b are connected in an annular shape via an insulating material and are continuous. A film 75 of a conductive material is formed on the upstream front mesh sheet 61a on at least the second surface opposite to the first surface that receives the airflow. On the downstream side rear mesh sheet 61b, a conductive material film 76 is formed on the surface facing the coating film 75 of the upstream side front mesh sheet 61a. For example, a metal material such as aluminum can be used as the conductive material. The coatings 75 and 76 are laminated on the surfaces of the mesh sheets 61a and 61b. For example, sputtering may be used to form the films 75 and 76. The air passage that penetrates in the air flow direction is secured as it is.

  The coating 75 of the front mesh sheet 61a and the coating 76 of the rear mesh sheet 61b are electrically separated from each other. As described above, the coating 75 of the front mesh sheet 61 a is connected to the ground 77 through the ground terminal 62. The film 76 of the rear mesh sheet 61b is connected to a high voltage power supply 78 of the main body 26 by wiring (not shown). The coating 76 of the rear mesh sheet 61 b forms an electrical barrier 79 having the same polarity as that of the charging electrode 68. Here, the coating 75 of the front mesh sheet 61a functions as a dust collecting electrode, and the coating 76 of the rear mesh sheet 61b functions as a repelling electrode.

  The charging electrode 68, the front mesh sheet 61a, and the rear mesh sheet 61b are arranged in the airflow generated by the blower fan 24. A front mesh sheet 61a is disposed downstream of the charging electrode 68 and a rear mesh sheet 61b is disposed downstream of the front mesh sheet 61a along the flow direction of the airflow. The charging electrode 68 is discharged into an air current. Here, positive ions 81 are generated in the airflow by the discharge. Positive ions 81 adhere to fine particles 82 such as dust in the airflow. Thus, the fine particles 82 are charged to the positive electrode (hereinafter, the charged fine particles are referred to as “charged fine particles 83”).

  When a high voltage is supplied to the coating 76 of the rear mesh sheet 61b, the surface of the rear mesh sheet 61b is positively charged. The positively charged mesh sheet 61b forms an electrical barrier 79 in a posture that intersects with the flow direction of the airflow. Here, the electrical barrier 79 is orthogonal to the flow direction of the airflow. The electrical barrier 79 continues along the surface of the rear mesh sheet 61b. Here, the electrical barrier 79 has the same polarity as the charging electrode 68, that is, a positive electrode. Since the mesh sheets 61a and 61b are connected in an annular shape via an insulating material, the coating 75 of the front mesh sheet 61a is electrically separated even when a high voltage is supplied to the coating 76.

  The airflow passes through the ventilation path defined by the mesh of the mesh sheet 61a. The charged fine particles 83 riding on the air current pass through the front mesh sheet 61a of the air filter 35 because they are smaller than the mesh of the mesh sheet 61a. The charged fine particles 83 collide with the electrical barrier 79. Since the charged fine particles 83 and the electric barrier 79 have the same polarity, the charged fine particles 83 are rebounded by the electric barrier 79. As a result, the traveling speed of the charged fine particles 83 is reduced and the traveling direction is reversed, and the charged fine particles 83 move toward the front mesh sheet 61 a and adhere to the coating 75.

  The coating 75 of the front mesh sheet 61 a is connected to the ground 77. When the charged fine particles 83 adhere to the coating 75 of the front mesh sheet 61 a, electric charges are exchanged between the charged fine particles 83 and the ground 77. The charged state of the charged fine particles 83 is eliminated. Thus, it is possible to prevent the front mesh sheet 61a from having the same polarity as that of the charging electrode 68. Even if the adhesion amount of the charged fine particles 83 increases, new charged fine particles 83 can reliably adhere to the coating 75 of the front mesh sheet 61a. Here, the polarity of the front mesh sheet 61a as the dust collecting electrode is the ground, but it is sufficient that the charged fine particles 83 are attached, and the polarity is opposite to the charged fine particles 83, that is, the negative polarity. You may do it.

  It is desirable that the film 76 of the rear mesh sheet 61b be opposed to the film 75 of the front mesh sheet 61a at equal intervals. Then, the electric barrier 79 suppresses the uneven distribution of potential. As a result, the charged fine particles 83 can evenly adhere to the coating 75 of the front mesh sheet 61a. Since the charged fine particles 88 are not unevenly distributed on the air filter 35, the charged fine particles 88 can be efficiently captured at the entire portion of the air filter 35 facing the electrical barrier 89. Here, when the distance between the coating film 76 and the coating film 75 is not constant, the amount of charged fine particles 88 adhering to the air filter 35 is biased, and the air filter 35 efficiently captures the charged fine particles 88. I can't. In addition, sparks may occur in close proximity. However, it is possible to prevent the occurrence of sparks between the coating 76 of the rear mesh sheet 61b and the coating 75 of the front mesh sheet 61a by setting the same intervals as described above.

  Here, in the air filter 35, the front mesh sheet 61a receives the airflow on the front surface (first surface) and supports the coating 75 on the rear surface (second surface opposite to the first surface). Similarly, the rear mesh sheet 61b supports the film 76 on the surface facing the film 75 of the front mesh sheet 61a. In this way, the coating 76 on the rear mesh sheet 61b is opposed to the coating 75 on the front mesh sheet 61a. The coating 75 of the front mesh sheet 61a and the coating 76 of the rear mesh sheet 61b are disposed between the insulators. Thereby, it can prevent that a user contacts the film 76 to which a high voltage is supplied directly from the outside.

  11 air conditioner, 26 housing (main body), 35 filter (air filter), 56 mesh sheet, 61a front mesh sheet, 61b rear mesh sheet, 62 ground terminal, 68 charging electrode, 71 passage, 72 cross section, 75 coating , 76 coating, 77 ground, 79 electric field.

Claims (2)

A housing forming an airflow passage;
A charging electrode that is disposed in the passage and discharges into the airflow to charge a substance in the airflow;
It is continuously connected in an annular shape, and is formed of an insulating mesh sheet having a first part and a second part that cross the passage before and after the flow direction of the airflow, and at least the airflow at the first part on the upstream side receiving a conductive material formed on the second side opposite the first side possess, at the second site downstream, in the above conductive material is opposed to the conductive material of the first portion of the upstream A filter that forms an electrical barrier of the same polarity as the charged electrode ;
An air conditioner, comprising: a ground terminal formed on the filter and connecting a ground to the conductive material. 2. The air conditioner according to claim 1 , wherein the conductive material of the first part is opposed to the conductive material of the second part at equal intervals.

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