• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Electrostatic collector comprising a collection chamber defined by a tubular wall oriented along a first axis; an elongate discharge electrode extending along said first axis; a collection electrode intended to be disposed inside the collection chamber against the wall, characterized in that the discharge electrode (10) has a tip-shaped end (10-1), said end being disposed opposite the collection electrode; a first portion, thin, (10a) of a first diameter, opening on said tip-shaped end, a second portion (10b) of a second diameter, the second diameter being greater than or equal to twice the first diameter the second diameter preferably being between 2 and 6 times the first diameter; and an abrupt enlargement (11) extending between the first portion (10a) and the second portion (10b).
    公开号:FR3022806A1
    申请号:FR1455908
    申请日:2014-06-25
    公开日:2016-01-01
    发明作者:Jean-Maxime Roux；Esteve Roland Sarda
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention relates to a device for electrostatically collecting particles suspended in a gaseous medium, commonly called electrostatic collector or electrofilter. STATE OF THE PRIOR ART The detection and analysis of particles present in the ambient air is a major current concern, whether for air quality monitoring, to protect populations of airborne pathogens (legionellae). , influenza, etc.) or for safety issues (detection of biological attacks). Electrostatic or electrofilter collectors, commonly referred to by the acronym ESP (Electrostatic Precipitator), are used to collect particles suspended in a gaseous medium, for example ambient air. They thus make it possible to purify the gaseous medium and possibly to analyze the collected particles. An electrostatic collector comprises two electrodes arranged close to each other. One of the two electrodes is commonly referred to as the discharge electrode and the other electrode is commonly referred to as a counter-electrode or a collection electrode. A high electric field is induced between the two electrodes under the effect of a potential difference applied between the two electrodes. The electric field ionizes the gas volume between the two electrodes, creating a sheath or ring of ionized gas around the discharge electrode. This phenomenon is called corona discharge. The gas containing the particles to be separated which is passed between the discharge electrode and the collection electrode then passes through an ion stream and the particles to be separated are ionized in turn. Under the effect of electrostatic forces, the charged particles thus created are attracted to the collection electrode on which they are collected. There is the problem of optimizing the electrical discharge generated between the discharge electrode and the collection electrode in order to maximize the collection efficiency. DISCLOSURE OF THE INVENTION The present invention aims in particular to solve these problems. The present invention relates to an electrostatic collector comprising a collection chamber defined by a tubular wall oriented along a first axis; an elongate discharge electrode extending along said first axis; and a collection electrode to be disposed within the collection chamber against the wall. According to one embodiment of the present invention, the discharge electrode comprises: - a tip-shaped end, said end being disposed facing the collection electrode; - A first portion, said thin portion, having a first diameter and opening on said tip-shaped end; a second portion having a second diameter, the second diameter being greater than or equal to twice the first diameter, the second diameter preferably being between 2 and 6 times the first diameter; and - a sudden enlargement, extending between the first and second parts. According to an embodiment of the present invention, said abrupt enlargement extends over a distance less than the second diameter. The first part may have a length less than about 10 mm, preferably less than about 5 mm, for example between about 1 and 5 mm.
    [0002] According to one embodiment of the present invention, the electrostatic collector further comprises a first polarization means, capable of carrying the discharge electrode to a first potential, and a second polarization means, suitable for carrying the collection electrode. at a second potential, the first potential being lower than the second potential. Preferably, the first potential is a ground potential. The first diameter may be between 0.5 mm and 2 mm. The second diameter may be between 1 mm and 5 to 6 mm. An advantage of a discharge electrode having such a sudden broadening is related to the fact that it makes it possible to obtain a more axisymmetric deposit of the particles on the collection electrode, with respect to a discharge electrode of constant diameter over its entire length. Such a discharge electrode makes it possible to avoid inhomogeneous accumulations of particles collected at the level of the collection electrode. This results in increased collection efficiency of the electrostatic collector. According to one embodiment of the present invention, the enlargement of the discharge electrode is formed by a conductive ring surrounding the first thin portion of the discharge electrode over a portion of its length, said tip-shaped end protruding of the ring.
    [0003] Advantageously, the end of the ring closest to the tip-shaped end of the discharge electrode is rounded. Said tip-shaped end may be located at a distance of between 2 mm and 10 mm from the ring. The ring may have an outer diameter of between 1 mm and 5 mm and an internal diameter that allows the passage and the maintenance of the first thin portion of the discharge electrode. According to one embodiment of the present invention, the discharge electrode is a hollow electrical conductive element, for example a metal capillary.
    [0004] The present invention also relates to an electrostatic collector comprising a collection chamber defined by a tubular wall oriented along a first axis; a discharge electrode, at least one end of which is in the form of a tip, intended to be disposed inside the collection chamber; a collection electrode, of tubular shape, intended to be disposed in an opening formed in the wall, the collection electrode having a first end and a second end, the first end being intended to be closest to said shaped end; peak of the discharge electrode; and biasing means for being disposed in said opening between the collection electrode and the wall.
    [0005] An advantage of such an electrostatic collector is related to the fact that it facilitates the removal of the collection electrode from the electrostatic collector, for example for the purpose of analyzing the collected particles and / or cleaning the electrode collection. The return means may be a spring.
    [0006] According to one embodiment of the present invention, the electrostatic collector further comprises a blocking member for pressing the second end of the collection electrode and compressing the biasing means. Preferably, the second end of the collection electrode comprises a flange. Advantageously, the first end of the collection electrode has a rounded internal rim. This reduces the risk of generating arcing between the discharge electrode and the collection electrode. According to one embodiment of the present invention, the inner wall of the collection electrode is a cone portion. According to one embodiment of the present invention, the collection chamber has a larger internal diameter upstream of the collection electrode than at the location of the collection electrode. The present invention also relates to a method of using an electrostatic collector according to the invention, as described above. The present invention further relates to a method of using an electrostatic collector comprising: - a collection chamber defined by a tubular wall oriented along a first axis; an elongated discharge electrode extending along said first axis; and a collection electrode disposed within the collection chamber, the discharge electrode having a tip-shaped end disposed facing the collection electrode; and - a first polarization means, capable of carrying the discharge electrode to a first potential, and a second polarization means, adapted to bring the collection electrode to a second potential; the method being such that the first potential is lower than the second potential. Preferably, the first potential is a ground potential. The present invention further relates to an electrostatic collector comprising: - a collection chamber defined by a tubular wall oriented along a first axis; an elongated discharge electrode extending along said first axis; and a collection electrode disposed within the collection chamber, the discharge electrode having a tip-shaped end disposed facing the collection electrode; and a first polarization means, capable of carrying the discharge electrode at a first potential, and a second polarization means, suitable for bringing the collection electrode to a second potential, the electrostatic collector being characterized by the fact that the first potential is lower than the second potential. Preferably, the first potential is a ground potential.
    [0007] BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the invention will emerge more clearly on reading the following description and with reference to the appended drawings, given solely by way of illustration and in no way limiting.
    [0008] Figure 1 is a sectional view schematically showing an embodiment of an electrostatic collector. Fig. 2 is a sectional view schematically showing an exemplary discharge electrode. Fig. 3A is a sectional view schematically showing an example of a collection electrode. Figure 3B is a photograph corresponding to Figure 3A. Fig. 4 is a sectional view schematically showing a variant of the collection electrode of Fig. 3A. Figure 5 is a sectional view schematically showing another embodiment of an electrostatic collector. FIG. 6 is a sectional view schematically showing an alternative embodiment of the electrostatic collector of FIG. 5. FIG. 7 represents results of measurement of the collection efficiency as a function of the diameter of the particles, for different polarizations of the electrode. discharge and the collection electrode. FIGS. 8A and 8B show results of measuring the collection efficiency as a function of the particle diameter in the case of a negative discharge, respectively when the discharge electrode is connected to ground and when the collection electrode is connected to the mass.
    [0009] Identical, similar or equivalent parts of the different figures bear the same numerical references so as to facilitate the passage from one figure to another. The different parts shown in the figures are not necessarily in a uniform scale, to make the figures more readable.
    [0010] DETAILED DESCRIPTION OF PARTICULAR EMBODIMENTS FIG. 1 is a sectional view schematically showing an embodiment of an electrostatic collector. A tubular wall 1, for example a cylinder of revolution, delimits a collection chamber 3. The longitudinal axis of the wall 1 is oriented along the z axis. The wall 1 is preferably made of an electrical insulating material. In operation, the electrostatic collector is intended to be oriented so that the z axis corresponds to the vertical direction or a direction inclined relative to the vertical. The wall 1 comprises an upstream end and a downstream end delimiting respectively an inlet 5 and an outlet 7 of the collection chamber. The terms "upstream", "downstream" and "inlet", "outlet" are considered in relation to the direction of flow of the gas to be treated in the electrostatic collector, symbolized by arrows 9. The gas to be treated flows from upstream to downstream, from the inlet 5 to the outlet 7 of the electrostatic collector.
    [0011] The device comprises an inlet chamber (not shown) for the admission of the gas to be treated, arranged upstream of the collection chamber 3. The intake chamber and the collection chamber are preferably coaxial. A discharge electrode 10, of elongate shape, comprising at least one electrically conductive material, is held in the collection chamber 3 by a support 13. In general, the discharge electrode 10 is advantageously formed of an element hollow electrical conductor, for example a metal capillary. The discharge electrode 10 is preferably arranged along the z-axis of the collection chamber. The support 13, for example a ring, whose two ends 14, 16 are fixed to the wall 1, transversely crosses the collection chamber. The longitudinal axis of the support 13 is oriented perpendicularly to the longitudinal axis along which extends the tubular wall 1 (z axis). The support 13 is preferably made of an insulating material. The support 13 comprises a through opening, for example cylindrical, the longitudinal axis of which is parallel to the axis z, configured to receive the discharge electrode 10. The longitudinal axis of the discharge electrode 10 is oriented according to the z axis. The discharge electrode 10 is in contact with a biasing means 17, comprising at least one electrically conductive part, which makes it possible to connect it electrically to a voltage generator 19. A collection electrode 20, of tubular shape, for example cylindrical shape, comprising at least one electrically conductive material, is disposed inside the collection chamber 3, in contact with the inner surface of the wall 1. The collection electrode 20 is disposed in an opening formed in the wall 1 of the collection chamber. The collection electrode 20 and the wall 1 are coaxial. The collection electrode 20 is intended to form the collection surface of the particles. Advantageously, the internal diameter of the collection electrode 20 is substantially equal to the internal diameter of the wall 1 to reduce the diameter discontinuities of the collection chamber in the path of the gas flow.
    [0012] The collection electrode 20 is in contact with a biasing means 21, comprising at least one electrically conductive part, which makes it possible to connect it electrically to the voltage generator 19. The support 13 is for example arranged in the collection chamber so that that the discharge electrode 10 is located upstream of the collection electrode 20, as shown in Figure 1. In this case, the end 10-1 of the discharge electrode 10 closest to the collecting electrode 20 corresponds to its downstream end. The end 20-1 of the collection electrode 20 closest to the discharge electrode 10 corresponds to its upstream end and the end 20-2 of the collection electrode 20 furthest from the electrode discharge 10 corresponds to its downstream end. The downstream end 10-1 of the discharge electrode 10, the closest to the collection electrode 20, is in the shape of a tip, which allows the formation of corona discharges between the discharge electrode (which has the lowest radius of curvature) and the collection electrode (which has the highest radius of curvature).
    [0013] The downstream end 10-1 of the discharge electrode 10 has for example a radius of curvature less than about 1 mm, hence the term "peak shape". Preferably, the distance between the downstream end 10-1 of the discharge electrode 10 and the upstream end 20-1 of the collection electrode 20 is greater than or equal to the internal radius of the collection chamber. This reduces the risk of arcing between the discharge electrode and the collection electrode. Advantageously, the distance between the downstream end 10-1 of the discharge electrode and the upstream end 20-1 of the collection electrode is less than three to four times the internal radius of the collection chamber. This optimizes the collection yield. For a collection chamber with an internal diameter of the order of 10 mm, the distance between the downstream end 10-1 of the discharge electrode 10 and the upstream end 20-1 of the collection electrode 20 is example between about 5 mm and about 20 mm, for example of the order of 7 mm.
    [0014] Advantageously, the internal diameter of the collection chamber is less than about 30 mm. Discharge electrode Advantageously, the discharge electrode 10 has an enlargement upstream of its downstream end 10-1.
    [0015] The discharge electrode 10 widens from a first diameter to a second diameter corresponding for example to about 2 to 6 times the first diameter. This enlargement is abrupt, that is to say that it extends over a distance less than the second diameter. Thus, the discharge electrode 10 comprises: - a tip-shaped downstream end 10-1 arranged facing the collection electrode 20; - A first portion having a first diameter, said thin portion, opening on said downstream end 10-1; a second portion having a second diameter, adjacent to the first portion, the second diameter being greater than or equal to twice the first diameter, the second diameter preferably being between 2 and 6 times the first diameter; and - an enlargement 11 extending between the first portion and the second portion, a distance less than the second diameter. An advantage of such a discharge electrode is related to the fact that it makes it possible to obtain a more axisymmetrical deposition of the particles on the collection electrode, with respect to a discharge electrode of constant diameter over its entire length. Such a discharge electrode makes it possible to avoid inhomogeneous accumulations of particles collected at the level of the collection electrode, such accumulations being able to degrade the operation of the device, in particular by reducing the collection efficiency. Moreover, it has been observed that the use of such a discharge electrode makes it possible to reduce the amplitude variations of the corona discharges. This results in a reduction of the variations in the collection efficiency of the electrostatic collector as and when it is used. As an example of dimensions, the first diameter may be between 0.5 and 2 mm, preferably between 0.5 and 1 mm. The discharge electrode 10 widens for example at a distance greater than or equal to 1 mm from its downstream end 10-1, for example at a distance of about 5 mm from its downstream end 10-1. The broadening of the discharge electrode 10 may be formed by a conductive ring surrounding the thin portion of the discharge electrode over part of its length. The downstream end of at least the thin portion of the discharge electrode protrudes from the ring. Thus, the discharge electrode 10 comprises a cylindrical ring disposed at a distance of the order of 1 to 10 mm from the downstream end 10-1, this ring extending along the same axis as the discharge electrode. Preferably, the inner diameter of the ring corresponds to the first diameter, and its outer diameter corresponds to the second diameter. Thus, the ring is inserted in contact with the thin portion of the discharge electrode. The distance over which this ring extends varies between a few mm and a few cm.
    [0016] As an example of dimensions, the ring may have an outer diameter of between 1 mm and 5 mm and an internal diameter that allows the passage and the maintenance of the thin portion of the discharge electrode 10. The thin portion of the discharge electrode 10 may protrude from the ring by a distance of between 1 mm and 10 mm downstream of the ring. The portion of the discharge electrode between the enlargement 11 and the downstream end 10-1 corresponds to the thin portion of the electrode. Its diameter is less than about 2 mm, preferably less than about 1 mm. The thin portion of the discharge electrode 10 is for example formed of a hollow electrical conductive element, for example a metal capillary. The metal capillary has for example an outer diameter of the order of 0.5 mm and an internal diameter of about 0.25 mm. Alternatively, the thin portion of the discharge electrode 10 is formed of a solid electrical conductor element. FIG. 2 is a sectional view schematically showing an example of such a discharge electrode that can be used in an electrostatic collector of the type illustrated in FIG. 1. This discharge electrode is formed of a metal capillary 10a surrounded by over part of its length by a metal ring 10b. The capillary 10a and the ring 10b are for example interconnected by a weld. The end 10c of the ring 10b, through which protrudes and passes the downstream end 10-1 of the discharge electrode 10, intended to be the closest to the collection electrode, is rounded. This avoids any peak effect. This rounding can be formed by a weld. For example, the discharge electrode 10 is formed of a metal capillary 10a of external diameter of the order of 0.5 mm and internal diameter of the order of 0.25 mm, surrounded on a part its length by a metal ring 10b of outer diameter of the order of 2 mm and internal diameter of the order of 0.5 mm. The capillary 10a opens out of the ring 10b for example at about 5 mm from the downstream end 10-1 of the discharge electrode 10. According to an alternative, the discharge electrode 10 may be formed in one piece, machined so as to have a thin end, that is to say less than about 2 mm in diameter, preferably less than about 1 mm, and an enlargement as previously described. As an example of materials, the thin portion 10a of the discharge electrode is preferably made of a metallic material, for example steel or stainless steel or copper or silver. The conductive ring 10b is preferably made of a metallic material, for example steel or stainless steel or copper or silver. Collection electrode The collection electrode 20 preferably has no protuberance or no asperity or no sharp angle facing the discharge electrode. The collection electrode 20 has a smooth-touch surface, i.e. the surface of the collection electrode has a roughness parameter Ra of less than about 0.7 μm, preferably less than about 0, 4 um. Preferably, the collection electrode 20 has a perfectly polished surface, i.e., the surface of the collection electrode has a roughness parameter Ra of less than about 0.2 μm. Preferably, the collection electrode 20 is made of a metallic material, for example aluminum. Alternatively, the collection electrode 20 is made of a conductive material other than a metallic material, for example stainless steel or at least one conductive polymer.
    [0017] Fig. 3A is a sectional view schematically showing an example of a collection electrode for use in an electrostatic collector of the type shown in Fig. 1. Fig. 3B is a photograph corresponding to Fig. 3A. The collection electrode 20 comprises a main portion 20b of cylindrical shape. 20-3 denotes the inner wall of the collection electrode 20, intended to form the collection surface of the particles, and 204 the outer wall of the collection electrode 20. In this example, the outer wall 20-4 and the inner wall 20-3 of the collection electrode 20 are cylindrical. The upstream end 20-1 of the collection electrode 20, intended to be the closest to the discharge electrode 10, has a rounded internal edge 20a. Thus, when it is positioned in the wall 1 of the collection chamber, the collection electrode 20 does not present a sharp angle opposite the discharge electrode 10. This reduces the risk of generating arcs. between the discharge electrode 10 and the collection electrode 20.
    [0018] The downstream end 20-2 of the collection electrode 20, intended to be the furthest away from the discharge electrode 10, comprises an outer flange 20c in the form of a flange. Fig. 4 is a sectional view schematically showing a variant of the collection electrode of Fig. 3A. The elements common with those of Figure 3A are designated by the same references. According to this variant, the internal diameter of the collection electrode is not constant. The inner wall 20-3 of the collection electrode 20 widens from the upstream end 20-1 to the downstream end 20-2, and the outer wall 20-4 is cylindrical. The inner wall 20-3 of the collection electrode 20 corresponds for example to a cone portion.
    [0019] The inclination angle θ of the inner wall 20-3 with respect to the axis of revolution of the collection electrode 20 is, for example, between approximately 1 ° and approximately 10 °. Fig. 5 is a sectional view schematically showing another embodiment of an electrostatic collector. The elements common with those of Figure 1 are designated by the same references and are not described again below. In this embodiment, the collection electrode 20 is removable, able to be inserted into the electrostatic collector and to be removed manually. It can then be inserted in an analysis device and / or in a cleaning device outside the electrostatic collector.
    [0020] An opening 42, formed in the wall 1 of the collection chamber, is configured to receive the collection electrode 20 and a return means 40, for example a spring, positioned in the opening 42 between the collection electrode 20 and the wall 1. The internal diameter of the collection electrode 20 substantially corresponds to the internal diameter of the wall 1. The opening 42 is formed so that no part of the return means 40 is closer to the electrode The downstream end 20-2 of the removable collection electrode 20 has a flange 20c forming a bearing surface for the biasing means 40. A locking piece 44 is to be positioned against the flange 20c to lock it against the return means 40. The return means 40 is preferably made of an electrically conductive material, for example stainless steel. In this case, the return means 40 is intended to be electrically connected to the polarization means 21 in order to bias the collection electrode 20. To insert and hold the collection electrode 20 in the electrostatic collector, the blocking piece 44 is positioned against the flange 20c of the collection electrode 20. The locking piece 44 blocks the flange 20c bearing against the return means 40, which compresses the latter. The return means 40 is supported both on the wall 1 of the collection chamber and on the collection electrode 20. To extract the collection electrode 20 from the electrostatic collector, the blocking piece 44 is removed. The biasing means 40 then pushes the collection electrode 20 out of the opening 42, which facilitates removal of the collection electrode from the electrostatic collector.
    [0021] An advantage of an electrostatic collector of the type described in connection with FIG. 5 is related to the fact that it facilitates the removal of the collection electrode from the electrostatic collector, for example with a view to analyzing the particles. collected and / or cleaning the collection electrode. Figure 6 is a sectional view schematically showing an alternative embodiment of the electrostatic collector of Figure 5. The elements common with those of Figure 5 are designated by the same references and are not described again below. In this variant, the collection chamber 3 has a larger internal diameter upstream of the collection electrode 20 than at the location of the collection electrode. This results in a decrease in the pressure drop of the device.
    [0022] The reduction factor of the diameter of the collection chamber 3 from upstream to downstream is for example of the order of 30 to 50%. The diameter restriction is preferably formed near the downstream end 10-1 of the discharge electrode 10, upstream of the downstream end 10-1, for example at a distance corresponding substantially to the internal diameter of the collection electrode. Between the downstream end 10-1 of the discharge electrode 10 and the collection electrode 20, the wall 1 of the collection chamber has an internal diameter substantially equal to the internal diameter of the collection electrode 20. An electrode Of the type illustrated in FIG. 2, it will of course be possible to use an electrostatic collector of the type illustrated in FIGS. 5 and 6. In addition, a collection electrode of the type illustrated in FIG. an electrostatic collector of the type of that illustrated in FIGS. 5 and 6. In an electrostatic collector of the type described in connection with FIGS. 1, 5 and 6 in operation, the voltage generator is able to impose an electric potential difference between the the collection electrode and the discharge electrode from about 1 kV to about 15 kV, preferably from about 6 kV to about 10 kV. Advantageously, the discharge electrode and the collection electrode are polarized so that the electric potential of the discharge electrode is lower than the electrical potential of the collection electrode. It is said that the electric discharge is negative. Advantageously, the discharge electrode 10 is connected to ground and the potential of the collection electrode 20 is positive.
    [0023] The inventors have carried out collection efficiency measurements as a function of particle diameter. These measurements enabled them to observe that, regardless of the diameter of the particles considered, the collection efficiency is optimized for a negative discharge and for a discharge electrode connected to ground.
    [0024] To carry out these measurements, the inventors passed ambient air containing natural dust into the collection chamber 3. At the outlet of the collection chamber, the treated air was taken from a bypass disposed in downstream of the collection electrode 20. A Grimm Dust Monitor v1.109 type optical particle counter was then used to analyze the air taken. This made it possible to determine the concentration of the particles in the air taken according to their diameter and to deduce the collection efficiency as a function of the particle diameter. The measurements were made with a collection chamber of internal diameter of the order of 10 mm, and for a distance of about 6 mm between the discharge electrode 10 and the collection electrode 20. FIG. results of measuring the collection efficiency as a function of the particle diameter, for different polarizations of the discharge electrode and the collection electrode and for an air flow rate of 5 liters per minute.
    [0025] The curves 61 and 62 correspond to a positive discharge, the potential of the discharge electrode being respectively 9 kV and 9.9 kV, the collection electrode being connected to ground. The curves 63 and 64 correspond to a negative discharge, the potential of the collection electrode being respectively 9 kV and 9.9 kV, the discharge electrode being connected to ground.
    [0026] These results show that, for all the particle sizes considered, the collection efficiency is optimized when the discharge is negative. FIGS. 8A and 8B show results of measuring the collection efficiency as a function of the particle diameter in the case of a negative discharge, respectively when the discharge electrode is connected to ground and when the collection electrode is connected to the mass. Measurements were made for a negative discharge of 9.9 kV. The curves 71 and 81 respectively correspond to the case where the discharge electrode is connected to ground and in the case where the collection electrode is connected to ground. The curves 73 and 83 respectively correspond to the case where the discharge electrode is connected to the earth and in the case where the collection electrode is connected to the ground (in case the mass is connected to the earth). These results show that, for all the particle sizes considered, in the case of a negative discharge, the collection efficiency is optimized when the discharge electrode is connected to ground. The inventors have found that these results apply even if the discharge electrode does not have any sudden enlargement as previously described, especially when the diameter of the collection chamber is less than 50 mm, and preferably less than 30 mm. mm, since the discharge electrode extends along the longitudinal axis of the collection chamber.
    权利要求:
    Claims (16)
    [0001]
    REVENDICATIONS1. An electrostatic collector comprising: a collection chamber (3) delimited by a tubular wall (1) oriented along a first axis (z); a discharge electrode (10) of elongate shape extending along said first axis (z); a collection electrode (20) intended to be disposed inside the collection chamber against the wall (1), characterized in that the discharge electrode (10) comprises: - an end (10-1), in the form of a tip, said end being disposed facing the collection electrode (20); a first thin portion (10a) of a first diameter, opening on said tip-shaped end, a second portion (1013) of a second diameter, the second diameter being greater than or equal to twice the first diameter, the second diameter preferably being between 2 and 6 times the first diameter; and - an enlargement (11), extending between the first portion (10a) and the second portion (10b).
    [0002]
    The electrostatic collector of claim 1, wherein the enlargement is abrupt (11), extending a distance less than the second diameter.
    [0003]
    The electrostatic collector of claim 1 or 2, further comprising: a first polarization means adapted to carry the discharge electrode (10) to a first potential; and a second polarization means, adapted to bring the collection electrode (20) to a second potential, the first potential being lower than the second potential, the first potential being preferably a ground potential.
    [0004]
    4. Electrostatic collector according to one of claims 1 to 3, wherein the first diameter is between 0.5 mm and 2 mm.
    [0005]
    An electrostatic collector according to one of claims 1 to 4, wherein the enlargement of the discharge electrode (10) is formed by a conductive ring (10b) surrounding the first thin portion (10a) of the electrode. discharging over a portion of its length, at least said tip-shaped end (10-1) protruding from the ring.
    [0006]
    The electrostatic collector of claim 5, wherein the end (10c) of the ring (10b) closest to said tip-shaped end (10-1) is rounded.
    [0007]
    The electrostatic collector of claim 5 or 6, wherein said tip-shaped end (10-1) is located at a distance of between 2 mm and 10 mm from the ring (10b).
    [0008]
    8. Electrostatic collector according to one of claims 5 to 7, wherein the ring (10b) has an outer diameter of between 1 mm and 5 mm and an inner diameter which allows the passage and maintenance of the first thin portion ( 10a) of the discharge electrode (10).
    [0009]
    9. Electrostatic collector according to one of claims 1 to 8, wherein the discharge electrode (10) is a hollow electrical conductive element, for example a metal capillary. 25
    [0010]
    An electrostatic collector according to one of claims 1 to 9, further comprising a biasing means (40), wherein the collection electrode (20) is tubular in shape and is intended to be disposed in an opening (42). ) formed in the wall (1), the collection electrode having a first end (20-1) and a second end (20-2), the first end (20-1) being intended to be the closest to said tip-shaped end (10-1) of the discharge electrode (10); and wherein the biasing means (40) is adapted to be disposed in said opening between the collection electrode (20) and the wall (1).
    [0011]
    The electrostatic collector of claim 10, wherein the biasing means (40) is a spring.
    [0012]
    The electrostatic collector of claim 10 or 11, further comprising a blocking member (44) for pressing the second end (20-2) of the collection electrode (20) and compressing the biasing means ( 40).
    [0013]
    13. Electrostatic collector according to one of claims 10 to 12, wherein the second end (20-2) of the collection electrode (20) comprises a flange (20c).
    [0014]
    Electrostatic collector according to one of claims 10 to 13, wherein the first end (20-1) of the collection electrode (20) has a rounded inner edge (20a).
    [0015]
    15. An electrostatic collector according to one of claims 10 to 14, wherein the inner wall (20-3) of the collection electrode (20) is a cone portion.
    [0016]
    An electrostatic collector according to one of claims 10 to 15, wherein the collection chamber (3) has a larger internal diameter upstream of the collection electrode (20) than at the location of the electrode. collection.
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    FR3022026A1|2015-12-11|DEVICE FOR COLLECTING AND TRANSPORTING NANO-OBJECTS CONTAINED IN AEROSOLS, WITH A CASSETTE WITH A MODULE ADAPTED TO REDUCE SUCTION NOISE DURING SAMPLING.
    同族专利:
    公开号 | 公开日
    US10384214B2|2019-08-20|
    EP3160651A1|2017-05-03|
    FR3022806B1|2019-06-21|
    WO2015197747A1|2015-12-30|
    US20170203304A1|2017-07-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR25527E|1921-05-10|1923-03-19|Purification Ind Des Gaz Soc D|Improvement in electric gas and vapor dust removal devices|
    GB413800A|1933-03-03|1934-07-26|Sturtevant Eng Co Ltd|Improvements in electrostatic precipitating plant|
    FR944547A|1947-03-20|1949-04-07|Cfcmug|Improvement in gas purification devices by electric precipitation|
    FR976521A|1947-12-16|1951-03-19|Sturtevant Eng Co Ltd|Electrostatic precipitation dust separator|
    FR1547889A|1966-12-03|1968-11-29|Metallgesellschaft Ag|Electrostatic dust collector|
    DE3234200A1|1981-09-19|1983-03-31|Franz Staad Braun|Electrostatic filter with double electrode|
    US4533368A|1982-09-30|1985-08-06|Black & Decker, Inc.|Apparatus for removing respirable aerosols from air|
    EP2266702A1|2009-06-27|2010-12-29|Karlsruher Institut für Technologie|Electrostatic separator for cleaning waste gas with an electrical restriction field|WO2019211439A1|2018-05-04|2019-11-07|Bertin Technologies|System for electrostatic collection of particles or microorganisms|
    WO2019211440A1|2018-05-04|2019-11-07|Bertin Technologies|Electrostatic particle collector|US2199390A|1937-11-23|1940-05-07|Int Precipitation Co|Electrical precipitation|
    US2244279A|1940-03-01|1941-06-03|Research Corp|Electrode for electric precipitators|
    US3400513A|1966-09-08|1968-09-10|Babcock & Wilcox Co|Electrostatic precipitator|
    US3495379A|1967-07-28|1970-02-17|Cottrell Res Inc|Discharge electrode configuration|
    US5395430A|1993-02-11|1995-03-07|Wet Electrostatic Technology, Inc.|Electrostatic precipitator assembly|
    CH702246A1|2009-11-18|2011-05-31|Beat Mueller|Electrostatic dust filter system, support for an electrode and electrode therefor.|
    FR3010642B1|2013-09-13|2015-10-09|Commissariat Energie Atomique|ELECTROSTATIC COLLECTOR|EP3093564B1|2015-05-12|2018-09-19|Blueair AB|Air cleaning device|
    KR101669391B1|2016-02-04|2016-10-25|주식회사 엔아이티코리아|Electrical Dust Filter Manufacturing Mehtod And Electrical Dust Filter Manufactured Thereby|
    法律状态:
    2015-06-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-01| PLSC| Search report ready|Effective date: 20160101 |
    2016-07-08| PLFP| Fee payment|Year of fee payment: 3 |
    2017-06-30| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-27| PLFP| Fee payment|Year of fee payment: 5 |
    2020-06-30| PLFP| Fee payment|Year of fee payment: 7 |
    2021-06-30| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1455908|2014-06-25|
    FR1455908A|FR3022806B1|2014-06-25|2014-06-25|ELECTROSTATIC COLLECTOR|FR1455908A| FR3022806B1|2014-06-25|2014-06-25|ELECTROSTATIC COLLECTOR|
    PCT/EP2015/064344| WO2015197747A1|2014-06-25|2015-06-25|Electrostatic collector|
    EP15731911.2A| EP3160651A1|2014-06-25|2015-06-25|Electrostatic collector|
    US15/321,589| US10384214B2|2014-06-25|2015-06-25|Electrostatic collector|
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