Electrostatic dust removal device and air purification equipment

Abstract

The present invention relates to the field of air purification technology, and discloses an electrostatic dust removal device and air purification equipment. The electrostatic dust removal device includes a dust removal chamber, a corona discharge module, an AC charging module, and an accelerating electric field module. The dust removal chamber is sequentially provided with a corona zone, a collision zone, and an accelerating zone. The corona discharge module is suitable for generating plasma, the AC charging module is suitable for forming a high-voltage alternating electric field, so that charged ions and charged particles move in a spiral trajectory in the collision zone, and the accelerating electric field module is suitable for accelerating the fully charged particles toward the direction of the dust collection port for discharge. The present invention fully mixes the charged ions, charged particles, and particulate matter in the collision zone through the transformation of the high-voltage AC electric field, so that the particles are fully charged. The fully charged particles are accelerated by the accelerating electric field module, thereby increasing the approach speed of the tiny particles, thereby increasing the collection efficiency of the tiny particles, and further increasing the dust removal efficiency of the electrostatic dust removal device under high wind speed.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to an electrostatic dust removal device and air purification equipment. Background Art

[0002] Existing electrostatic precipitators cannot achieve high dust removal efficiency at high wind speeds because dust particles and charged particles in the air are insufficiently and unevenly charged in the corona zone. Specifically, at high wind speeds, particles spend too little time in the corona zone, resulting in a very limited charging time. Uncharged or lightly charged particles, due to insufficient charge, experience insufficient Coulomb force, resulting in a reduced approach velocity and low dust collection efficiency. This is particularly true for fine particles, which can be collected even less efficiently or even impossible to collect. Summary of the Invention

[0003] In view of this, the present invention provides an electrostatic precipitator and an air purification device to solve the problems of uneven particle charging and low dust collection efficiency in electrostatic precipitators at high wind speeds in the prior art.

[0004] In the first aspect, the present invention provides an electrostatic dust removal device, comprising a dust removal chamber, a corona discharge module, an AC charging module, and an accelerating electric field module. The dust removal chamber is provided with an air inlet and a dust collecting port, and a corona zone, a collision zone, and an acceleration zone are sequentially provided in the dust removal chamber from the air inlet to the dust collecting port. The corona discharge module is provided in the corona zone, and is suitable for generating plasma by corona discharge in the corona zone, and the electrons and charged ions in the plasma are suitable for adhering to particulate matter in the air to form charged particles. The AC charging module is provided in the collision zone, and is suitable for forming a high-voltage alternating electric field in the collision zone, so that the charged ions and charged particles move in a spiral trajectory in the collision zone, thereby causing the charged ions, charged particles, and particulate matter to collide with each other and be fully charged. The accelerating electric field module is provided in the acceleration zone, and is suitable for causing the fully charged particles to accelerate and be discharged in the acceleration zone toward the dust collecting port.

[0005] Beneficial effect: Through the transformation of the high-voltage AC electric field of the AC charging module, the charged ions and charged particles are caused to perform spiral motion in the collision zone, so that the charged particles, the charged particles already charged in the corona zone, and the particulate matter in the air can collide with each other in the collision zone, fully mix, and make the particles fully charged. At the same time, the uniformity of the particle charge is improved, thereby improving the dust collection efficiency, and effectively solving the problem that under high wind speed conditions, the particles in the existing electrostatic precipitator stay in the corona zone for too short a time, the charging time is limited, and the particles that are not charged or have less charge are not subjected to sufficient Coulomb force due to insufficient charge, and the approach speed is reduced, resulting in low dust collection efficiency. In addition, through the setting of the acceleration electric field module, the particles that are fully charged in the collision zone are accelerated by the acceleration electric field module, which increases the approach speed of the tiny particles, thereby improving the collection efficiency of the tiny particles, and thereby improving the dust removal efficiency of the electrostatic precipitator under high wind speed.

[0006] In an optional embodiment, the AC charging module includes a first electrode plate and a second electrode plate, the first electrode plate is suitable for connecting to the high voltage end of a high voltage AC power supply; the second electrode plate is arranged parallel to and spaced apart from the first electrode plate, and the second electrode plate is suitable for connecting to the low voltage end of the high voltage AC power supply; an AC electric field is formed between the first electrode plate and the second electrode plate, and under the action of the AC electric field, the charged ions and charged particles move in a directed spiral trajectory in the collision zone.

[0007] Beneficial Effects: A high-voltage AC electric field is formed between the first and second electrode plates. Under the action of the AC electric field, a large number of charged ions and particles move in a spiral trajectory, and then the dust-laden air is charged by diffusion charging, so that incompletely charged particles collide and mix with charged ions multiple times, fully charged, and improve the uniformity of particle charging, thereby greatly improving dust removal efficiency. The electrostatic dust removal module provided by this application controls the electric field transformation of high-voltage AC to fully mix charged ions and particulate matter, making the particles fully charged. This effectively solves the problem of uneven particle charging and low dust removal efficiency in existing electrostatic dust removal devices at high wind speeds.

[0008] In an optional embodiment, the accelerating electric field module includes a third electrode plate and a fourth electrode plate, the fourth electrode plate is arranged parallel to and spaced apart from the third electrode plate, the electrical polarity and the output voltage of the fourth electrode plate are the same as the electrical polarity and the output voltage of the third electrode plate, and an accelerating electric field is formed between the third electrode plate and the fourth electrode plate, and the charged particles are accelerated into the dust collection port under the push of the electric field force.

[0009] Beneficial effect: The third electrode plate and the fourth electrode plate are arranged on opposite sides of the dust removal chamber, the polarity and voltage of the two electrode plates are the same, the electric field forces generated by the two electrode plates each tend to the middle position, and the resultant force is toward the dust collecting port. Under the same polarity electric field, all fine particles and charged particles can perform linear acceleration motion between the two parallel electrode plates, and thus accelerate into the dust collecting port under the push of the electric field force, thereby increasing the approach speed of the particles and thus improving the dust collection efficiency.

[0010] In this embodiment, fully charged particles are accelerated by two parallel high-voltage, same-polarity electrodes, increasing the speed at which ultra-fine particles approach, thereby improving collection efficiency. This effectively addresses the problem of existing air purification equipment having low or even no collection efficiency for particles as small as 0.3-0.5 microns.

[0011] In an optional embodiment, the accelerating electric field module is connected to a high-voltage DC power supply; and the third electrode plate and the fourth electrode plate are respectively connected to the high-voltage end of the same high-voltage DC power supply.

[0012] Beneficial effect: By using the same high-voltage DC power supply to connect the third electrode plate and the fourth electrode plate respectively, the purpose of simplifying the structure, saving costs and reducing installation space is achieved.

[0013] In an optional embodiment, the accelerating electric field module is connected to a high-voltage DC power supply; the high-voltage DC power supply includes a first high-voltage DC power supply and a second high-voltage DC power supply with the same output voltage; the third electrode plate is connected to the high-voltage end of the first high-voltage DC power supply, and the fourth electrode plate is connected to the high-voltage end of the second high-voltage DC power supply.

[0014] Beneficial effect: The voltages of the first high-voltage DC power supply and the second high-voltage DC power supply are of the same polarity and the same voltage. The third electrode plate and the fourth electrode plate are powered by two independent power supplies with the same output voltage, which makes the installation of the third electrode plate and the fourth electrode plate more convenient and avoids the inconvenience of the two electrode plates sharing the same power supply wiring.

[0015] In an optional embodiment, the first electrode plate and the third electrode plate are arranged in sequence on one side of the dust removal chamber along the airflow direction, and the second electrode plate and the fourth electrode plate are arranged in sequence on the other side of the dust removal chamber along the airflow direction; wherein, the first electrode plate and the third electrode plate are separated by a first insulating structure, and the third electrode plate and the fourth electrode plate are separated by a second insulating structure.

[0016] Beneficial effect: The charged first electrode plate and the third electrode plate are isolated by the first insulating structure, and the charged second electrode plate and the fourth electrode plate are isolated by the second insulating structure, thereby preventing two adjacent electrode plates from being conductive.

[0017] In an optional embodiment, the first electrode plate, the second electrode plate, the third electrode plate, and the fourth electrode plate are all metal plates.

[0018] In an optional embodiment, the accelerating electric field module further includes a grounded air outlet ring, which is arranged at the dust collecting port and is connected to the low voltage end of the high voltage DC power supply and is grounded.

[0019] Beneficial effect: By setting a grounding air outlet ring, the low-voltage end of the same high-voltage DC power supply shared by the third electrode plate and the fourth electrode plate is grounded, or the low-voltage ends of the first high-voltage DC power supply and the second high-voltage DC power supply to which the third electrode plate and the fourth electrode plate are respectively connected are grounded together, thereby preventing electric shock and improving the safety of equipment use.

[0020] In an optional embodiment, the corona discharge module includes a high-voltage discharge electrode and a third high-voltage DC power supply, the high-voltage discharge electrode includes a ring electrode and a needle-shaped electrode, the ring electrode is suitable for connecting to the low-voltage end of the third high-voltage DC power supply; the needle-shaped electrode is located at the center of the ring electrode, and the needle-shaped electrode is suitable for connecting to the high-voltage end of the third high-voltage DC power supply; there is a set discharge distance between the needle-shaped electrode and the inner ring surface of the ring electrode, there is a potential difference between the needle-shaped electrode and the ring electrode, and the needle-shaped electrode generates corona discharge under the action of the potential difference.

[0021] Beneficial effect: By setting up needle-shaped electrodes and ring electrodes and utilizing the tip discharge principle, when the electrostatic precipitator is started, the air will be broken down at the needle tip to generate a large amount of plasma, thus preparing for subsequent particle charging.

[0022] In an optional embodiment, the electrostatic precipitator further includes a dust collecting hood, which is arranged between the accelerating electric field module and the dust collecting port, and the dust collecting hood has a guide channel suitable for collecting and guiding the charged particles accelerated by the accelerating electric field module to the dust collecting port.

[0023] Beneficial effect: The dust collecting hood can collect, gather and guide the particulate matter in the air, preventing the particulate pollutants from spreading around.

[0024] In an optional embodiment, the dust collecting hood is an insulating air duct, and the dust collecting hood includes a diameter-reducing section, and the inner diameter of the diameter-reducing section gradually decreases along the gas flow direction.

[0025] Beneficial effect: By setting a gradually narrowing variable diameter section, the air outlet area gradually decreases. According to V=Q / S, when the air volume Q remains unchanged, the air outlet area S becomes smaller and the speed V will become larger, thereby increasing the air outlet speed of the particles and thus improving the collection effect of fine particles.

[0026] In a second aspect, the present invention further provides an air purification device comprising the electrostatic dust removal device described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of an electrostatic precipitator according to an embodiment of the present invention;

[0029] Figure 2 Schematic top view of an electrostatic precipitator according to an embodiment of the present invention;

[0030] Figure 3 A schematic structural diagram of an implementation scheme of a dust collecting hood in an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the structure of another embodiment of the dust collecting hood in the embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 100. Dust removal chamber; 101. Air inlet; 102. Dust collection port;

[0034] 10. Corona discharge module; 11. High-voltage discharge electrode; 111. Needle electrode; 112. Ring electrode; 12. Third high-voltage DC power supply;

[0035] 20. AC charging module; 21. First electrode plate; 22. Second electrode plate; 23. High-voltage AC power supply;

[0036] 30. Accelerating electric field module; 31. Third electrode plate; 32. Fourth electrode plate; 33. First high-voltage DC power supply; 34. Second high-voltage DC power supply; 35. Grounded air outlet ring; 36. First insulation structure; 37. Second insulation structure;

[0037] 40. Dust collecting hood; 41. Variable diameter section; 42. Output section. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "inner," "upper," "outer," "lower," and "under" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal connection between two components; wireless connection or wired connection. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0041] The electrostatic dust removal device in the related art cannot achieve high dust removal efficiency at high wind speeds because the dust particles and charged particles in the air are not fully and uniformly charged in the corona zone.

[0042] Specifically, at high wind speeds, particles spend too little time in the corona zone, resulting in a very limited charging time. Uncharged or lightly charged particles, due to insufficient charge, experience insufficient Coulomb force, slowing their approach speed and leading to low dust collection efficiency. In particular, collection efficiency is even lower for fine particles between 0.3 and 0.5 microns, or even impossible to collect.

[0043] The following combination Figures 1 to 4 , describing embodiments of the present invention.

[0044] According to an embodiment of the present invention, on one hand, the present invention provides an electrostatic precipitator, including a dust removal chamber 100 , a corona discharge module 10 , an AC charging module 20 , and an accelerating electric field module 30 .

[0045] Specifically, the dust removal chamber 100 is provided with an air inlet 101 and a dust collecting port 102 , and a corona zone, a collision zone, and an acceleration zone are sequentially provided in the dust removal chamber 100 in a direction from the air inlet 101 to the dust collecting port 102 .

[0046] Further, if Figure 1 and Figure 2 As shown, the corona discharge module 10 is arranged in the corona zone and is suitable for generating plasma by corona discharge in the corona zone. The electrons and charged ions in the plasma are suitable for adhering to particulate matter in the air to form charged particles. The AC charging module 20 is arranged in the collision zone and is suitable for forming a high-voltage alternating electric field in the collision zone to cause the charged ions and charged particles to move in a spiral trajectory in the collision zone, thereby causing the charged ions, charged particles and particulate matter to collide with each other and be fully charged.

[0047] Furthermore, the accelerating electric field module 30 is disposed in the acceleration zone, and is adapted to accelerate the fully charged particles in the acceleration zone toward the dust collecting port 102 for discharge.

[0048] In the above embodiment, the high-voltage AC electric field of the AC charging module 20 is transformed to make the charged ions and charged particles perform spiral motion in the collision zone, so that the charged particles, the charged particles already charged in the corona zone, and the particulate matter in the air can collide with each other in the collision zone and be fully mixed, so that the particles are fully charged, and at the same time the uniformity of the particle charge is improved, thereby improving the dust collection efficiency, and effectively solving the problem that under high wind speed conditions, the particles in the existing electrostatic dust removal device stay too short in the corona zone, the charging time is limited, and the particles that are not charged or have less charge are insufficiently charged and are subjected to insufficient Coulomb force, resulting in a reduced approach speed, resulting in low dust collection efficiency.

[0049] In addition, in this embodiment, by setting up the accelerating electric field module 30, the fully charged particles in the collision zone are accelerated by the accelerating electric field module 30, thereby increasing the approach speed of the tiny particles, thereby improving the collection efficiency of the tiny particles, and further improving the dust removal efficiency of the electrostatic precipitator at high wind speeds.

[0050] In some embodiments, the AC charging module 20 includes a first electrode plate 21 and a second electrode plate 22, wherein the first electrode plate 21 is suitable for connecting to the high voltage end of a high voltage AC power supply 23; the second electrode plate 22 is arranged parallel to and spaced apart from the first electrode plate 21, and the second electrode plate 22 is suitable for connecting to the low voltage end of the high voltage AC power supply 23; an AC electric field is formed between the first electrode plate 21 and the second electrode plate 22, and under the action of the AC electric field, charged ions and charged particles move in a directed spiral trajectory in the collision zone.

[0051] In the above embodiment, the first electrode plate 21 and the second electrode plate 22 are arranged on opposite sides of the dust removal chamber 100. A high-voltage AC electric field is formed between the first electrode plate 21 and the second electrode plate 22. Under the action of the AC electric field, a large number of charged ions and particles move in a spiral trajectory, and then the dust-laden air is charged by diffusion charge, so that the incompletely charged particles collide and mix with the charged ions multiple times, fully charged, and improve the uniformity of the particle charge, thereby greatly improving the dust removal efficiency. This embodiment uses high-voltage AC electric field transformation to fully mix the charged ions and particulate matter, so that the particles are fully charged, effectively solving the problem of uneven particle charging and low dust removal efficiency at high wind speeds in existing electrostatic precipitators.

[0052] It should be explained that the directional spiral trajectory motion in this embodiment refers to the spiral trajectory motion of the charged particles from the air inlet 101 toward the dust collecting port 102, that is, the spiral trajectory motion from the corona zone toward the acceleration zone.

[0053] In some embodiments, the accelerating electric field module 30 includes a third electrode plate 31 and a fourth electrode plate 32. The fourth electrode plate 32 is arranged parallel to the third electrode plate 31 and spaced apart. The electrical polarity and output voltage of the fourth electrode plate 32 are the same as the electrical polarity and output voltage of the third electrode plate 31. An accelerating electric field is formed between the third electrode plate 31 and the fourth electrode plate 32. The charged particles are accelerated into the dust collection port 102 under the push of the electric field force.

[0054] In the above embodiment, the third electrode plate 31 and the fourth electrode plate 32 are disposed on opposite sides of the dust removal chamber 100. The polarity and voltage of the two electrode plates are the same. The electric field forces generated by the two electrode plates each converge toward the center, and the combined force is directed toward the dust collection port 102. Under the same polarity electric field, all fine particles and charged particles are able to undergo linear acceleration motion between the two parallel electrode plates. These particles are then accelerated into the dust collection port 102 by the electric force, increasing the particle approach speed and thereby improving dust collection efficiency.

[0055] In this embodiment, fully charged particles are accelerated by two parallel high-voltage, same-polarity electrodes, increasing the speed at which ultra-fine particles approach, thereby improving collection efficiency. This effectively addresses the problem of existing air purification equipment having low or even no collection efficiency for particles as small as 0.3-0.5 microns.

[0056] In some embodiments, the accelerating electric field module 30 is connected to a high-voltage DC power supply; the third electrode plate 31 and the fourth electrode plate 32 are respectively connected to the high-voltage end of the same high-voltage DC power supply.

[0057] In the above embodiment, by using the same high-voltage DC power supply to connect the third electrode plate 31 and the fourth electrode plate 32 respectively, the purpose of simplifying the structure, saving costs and reducing the installation space is achieved.

[0058] In other alternative implementations of the above embodiment, the high-voltage DC power supply includes a first high-voltage DC power supply 33 and a second high-voltage DC power supply 34 with the same output voltage, the third electrode plate 31 is connected to the high-voltage end of the first high-voltage DC power supply 33, and the fourth electrode plate 32 is connected to the high-voltage end of the second high-voltage DC power supply 34.

[0059] In the above embodiment, the voltages of the first high-voltage DC power supply 33 and the second high-voltage DC power supply 34 are of the same polarity and the same voltage magnitude. The third electrode plate 31 and the fourth electrode plate 32 are powered by two independent power supplies with the same output voltage, which makes the installation of the third electrode plate 31 and the fourth electrode plate 32 more convenient and avoids the inconvenience of the two electrode plates sharing the same power supply wiring.

[0060] Preferably, if Figure 1 As shown, in this embodiment, the third electrode plate 31 and the fourth electrode plate 32 are connected to the first high-voltage DC power supply 33 and the second high-voltage DC power supply 34 respectively.

[0061] In some embodiments, the first electrode plate 21 and the third electrode plate 31 are arranged in sequence on one side of the dust removal chamber 100 along the airflow direction, and the second electrode plate 22 and the fourth electrode plate 32 are arranged in sequence on the other side of the dust removal chamber 100 along the airflow direction; wherein, the first electrode plate 21 and the third electrode plate 31 are separated by a first insulating structure 36, and the third electrode plate 31 and the fourth electrode plate 32 are separated by a second insulating structure 37.

[0062] In the above embodiment, the first insulating structure 36 is provided to isolate the charged first electrode plate 21 and the third electrode plate 31 , and the second insulating structure 37 is provided to isolate the charged second electrode plate 22 and the fourth electrode plate 32 , thereby preventing conduction between two adjacent electrode plates.

[0063] Optionally, the first insulating structure 36 can be fixed to an end of the third electrode plate 31 near the first electrode plate 21, and the second insulating structure 37 can be fixed to an end of the fourth electrode plate 32 near the second electrode plate 22. The first insulating structure 36 and the second insulating structure 37 are insulators. Both the first insulating structure 36 and the second insulating structure 37 are made of insulating materials such as ceramic, plastic, or glass.

[0064] In some embodiments, the first electrode plate 21 , the second electrode plate 22 , the third electrode plate 31 , and the fourth electrode plate 32 are all metal plates.

[0065] In some embodiments, the accelerating electric field module 30 further includes a grounded air outlet ring 35 , which is disposed at the dust collecting port 102 . The grounded air outlet ring 35 is connected to the low-voltage end of the high-voltage DC power supply of the accelerating electric field module 30 and is grounded.

[0066] Specifically, in a more specific embodiment, the grounded air outlet ring 35 is connected to the low voltage ends of the first high voltage DC power supply 33 and the second high voltage DC power supply 34 respectively, and the grounded air outlet ring 35 is grounded.

[0067] By setting a grounding air outlet ring 35, the low-voltage end of the same high-voltage DC power supply shared by the third electrode plate 31 and the fourth electrode plate 32 is grounded, or the low-voltage ends of the first high-voltage DC power supply 33 and the second high-voltage DC power supply 34 to which the third electrode plate 31 and the fourth electrode plate 32 are respectively connected are grounded together, thereby preventing electric shock and improving the safety of equipment use.

[0068] Specifically, the grounded air outlet ring 35 is a circular metal ring. The grounded air outlet ring 35 is positioned inside the sidewall of the dust removal chamber 100 where the dust collection port 102 is located. The inner diameter of the grounded air outlet ring 35 matches the inner diameter of the dust collection port 102 to facilitate the passage of particulate matter without obstruction. Alternatively, in another embodiment, the outer diameter of the grounded air outlet ring 35 matches the inner diameter of the dust collection port 102, and the grounded air outlet ring 35 is embedded within the dust collection port 102.

[0069] In some embodiments, the corona discharge module 10 includes a high-voltage discharge electrode 11 and a third high-voltage DC power supply 12, the high-voltage discharge electrode 11 includes a ring electrode 112 and a needle-shaped electrode 111, the ring electrode 112 is suitable for connecting to the low-voltage end of the third high-voltage DC power supply 12; the needle-shaped electrode 111 is located at the center of the ring electrode 112, and the needle-shaped electrode 111 is suitable for connecting to the high-voltage end of the third high-voltage DC power supply 12; there is a set discharge distance between the needle-shaped electrode 111 and the inner annular surface of the ring electrode 112, and there is a potential difference between the needle-shaped electrode 111 and the ring electrode 112, and the needle-shaped electrode 111 generates corona discharge under the action of the potential difference.

[0070] In the above embodiment, by providing the needle-shaped electrode 111 and the ring-shaped electrode 112 and utilizing the tip discharge principle, when the electrostatic precipitator is started, the air will be broken down at the needle tip to generate a large amount of plasma, thereby preparing for subsequent particle charging.

[0071] Furthermore, the set discharge distance is D, 0<D<20mm. The annular electrode 112 is suitable for grounding. The annular electrode 112 is used as a discharge ground ring for grounding, which can prevent electric shock and improve the safety of equipment use.

[0072] It should be noted that in this embodiment, the high-voltage discharge electrode 11 adopts a needle-ring discharge electrode structure. Of course, other electrode structures can also be used instead, for example, a wire-plate electrode structure or a sawtooth-plate electrode structure. This embodiment does not limit the specific structure of the high-voltage discharge electrode 11, as long as it can ionize and generate corona discharge.

[0073] In some embodiments, the electrostatic dust removal device also includes a dust collecting hood 40, which is arranged between the accelerating electric field module 30 and the dust collecting port 102. The dust collecting hood 40 has a guide channel suitable for collecting and guiding the charged particles accelerated by the accelerating electric field module 30 to the dust collecting port 102.

[0074] In the above embodiment, the dust collecting hood 40 is provided to collect, gather and guide the particulate matter in the air, thereby preventing the particulate pollutants from spreading to the surroundings.

[0075] In some embodiments, the dust collecting hood 40 is an insulating air duct, and the dust collecting hood 40 includes a diameter-reducing section 41 , the inner diameter of which gradually decreases along the gas flow direction.

[0076] In the above embodiment, the gradually narrowing variable diameter section 41 is provided, and the air outlet area is gradually reduced. According to V=Q / S, when the air volume Q remains unchanged, the air outlet area S becomes smaller and the speed V becomes larger, thereby increasing the air outlet speed of the particles and further improving the collection effect of fine particles.

[0077] Furthermore, the large-diameter end of the reducing section 41 is connected to the end of the third and fourth electrode plates 31, 32 that is away from the AC charging module 20. The inner diameter of the large-diameter end of the reducing section 41 is consistent with the distance between the third and fourth electrode plates 31, 32. The dust hood 40 also includes an output section 42 with a constant inner diameter. The small-diameter end of the reducing section 41 is connected to the output section 42. The other end of the output section 42 is provided with a grounded air outlet ring 35, and the other end of the output section 42 is connected to the dust collection port 102.

[0078] Alternatively, as Figure 1 and Figure 3 As shown, the diameter-reducing section 41 is a frustum-shaped structure, and the output section 42 is a cylindrical structure.

[0079] Of course, if Figure 4 As shown, in other alternative embodiments, the dust collecting cover 40 only includes the diameter reducing section 41, that is, the output section 42 in the above embodiment is omitted. The peripheral wall of the dust collecting cover 40 is a truncated cone structure as a whole.

[0080] The following combination Figures 1 to 3 The working process and principle of the electrostatic precipitator in this embodiment are introduced.

[0081] First, a needle-ring high-voltage discharge electrode 11 is installed at the air inlet 101 of the electrostatic precipitator. The tip of the needle electrode 111 is located at the central axis of the ring electrode 112, and there is a certain discharge distance between the needle electrode 111 and the inner circumference of the ring electrode 112. The high-voltage end of the third high-voltage DC power supply 12 is connected to the needle electrode 111, and the low-voltage end is connected to the ring electrode 112. Utilizing the principle of tip discharge, when the device is in operation, the needle tip will break through the air, generating a large amount of plasma, preparing for subsequent particle charging.

[0082] Furthermore, two parallel first and second electrode plates 21, 22 are located below the needle-ring high-voltage discharge electrode 11. These plates are connected to the high-voltage and low-voltage terminals of a high-voltage AC power source 23, respectively. When charged ions and particles are exposed to the AC electric field, a large number of them move in a spiral trajectory, enhancing the diffuse charging effect and allowing partially charged particles to collide with ions multiple times, becoming fully charged.

[0083] Furthermore, a third electrode plate 31 and a fourth electrode plate 32 are respectively arranged below the first electrode plate 21 and the second electrode plate 22, and the third electrode plate 31 and the fourth electrode plate 32 are arranged in parallel and spaced apart. The third electrode plate 31 is connected to the high voltage end of the first high-voltage DC power supply 33, and the fourth electrode plate 32 is connected to the high voltage end of the second high-voltage DC power supply 34. The third electrode plate 31 and the fourth electrode plate 32 have the same electrical polarity and output the same voltage. Insulators are respectively provided between the first electrode plate 21 and the third electrode plate 31, and between the second electrode plate 22 and the fourth electrode plate 32. At this time, when the charged particles pass through the acceleration zone, they are accelerated and move directly between the parallel third electrode plate 31 and the fourth electrode plate 32 under the same polarity electric field. All fine particles are collected and accelerated, which increases the approach speed of the particles and thereby improves the dust accumulation effect.

[0084] Furthermore, a narrowed dust hood 40 is provided below the third electrode plate 31 and the fourth electrode plate 32, thereby reducing the air outlet area. When the air volume Q remains unchanged, the air outlet area S becomes smaller and the speed V becomes larger, thereby increasing the air outlet speed of tiny particles and thereby improving the collection effect of fine particles.

[0085] Therefore, the electrostatic precipitator provided in this embodiment has the following advantages:

[0086] 1. By setting up the AC charging module 20, the high-voltage AC electric field transformation in the collision zone causes the charged ions and particulate matter to collide repeatedly and mix fully. The alternating electric field is used to ensure the charge of the charged particles, so that the particles are fully charged, which plays a key role in the subsequent particle acceleration and collection, greatly increasing efficiency.

[0087] 2. By setting up the accelerating electric field module 30, fully charged particles are accelerated by the parallel high-voltage third electrode plate 31 and the fourth electrode plate 32 of the same polarity, thereby increasing the approach speed to the ultra-fine particles and thus improving the collection efficiency.

[0088] 3. By providing the dust collecting hood 40 with the variable diameter section 41, the air outlet area is reduced, so that the air outlet speed of the particles is increased while the pressure remains unchanged, thereby improving the collection effect of fine particles.

[0089] According to an embodiment of the present invention, on the other hand, an air purification device is provided, comprising the electrostatic dust removal device of any one of the above embodiments.

[0090] The air purification equipment provided in this embodiment achieves efficient collection of fine particulate matter by adopting the electrostatic dust removal device of the above-mentioned embodiment, while greatly improving the dust removal efficiency of the air purification equipment at high wind speeds.

[0091] Optionally, in this embodiment, the air purification device is a dust collector.

[0092] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An electrostatic dust removal device, characterized in that: include: A dust removal chamber (100), wherein the dust removal chamber (100) is provided with an air inlet (101) and a dust collection port (102), and a corona zone, a collision zone, and an acceleration zone are sequentially provided in the dust removal chamber (100) in a direction from the air inlet (101) to the dust collection port (102); A corona discharge module (10) is arranged in the corona zone and is suitable for generating plasma by corona discharge in the corona zone, wherein electrons and charged ions in the plasma are suitable for adhering to particulate matter in the air to form charged particles; An AC charging module (20) is provided in the collision zone and is adapted to form a high-voltage alternating electric field in the collision zone, so that the charged ions and charged particles move in a spiral trajectory in the collision zone, thereby causing the charged ions, charged particles and particulate matter to collide with each other and be fully charged; An accelerating electric field module (30) is provided in the acceleration zone and is adapted to accelerate the fully charged particles in the acceleration zone toward the dust collecting port (102) for discharge; The electrostatic precipitator further comprises: A dust collecting hood (40) is arranged between the accelerating electric field module (30) and the dust collecting port (102), wherein the dust collecting hood (40) has a guide channel suitable for collecting charged particles accelerated by the accelerating electric field module (30) and guiding them to the dust collecting port (102); The dust collecting hood (40) is an insulating air duct. The dust collecting hood (40) includes a diameter-reducing section (41), the inner diameter of which gradually decreases along the gas flow direction. The dust collecting hood (40) also includes an output section (42) with a constant inner diameter. The small-diameter end of the diameter-reducing section (41) is connected to the output section (42), and the other end of the output section (42) is connected to the dust collecting port (102).

2. The electrostatic precipitator according to claim 1, characterized in that: The AC charging module (20) comprises: A first electrode plate (21) adapted to be connected to a high-voltage terminal of a high-voltage AC power source (23); a second electrode plate (22) arranged parallel to and spaced apart from the first electrode plate (21), the second electrode plate (22) being suitable for connecting to a low-voltage end of the high-voltage AC power source (23); An alternating current electric field is formed between the first electrode plate (21) and the second electrode plate (22), and under the action of the alternating current electric field, the charged ions and charged particles move in a directional spiral trajectory within the collision zone.

3. The electrostatic precipitator according to claim 2, characterized in that: The accelerating electric field module (30) comprises: a third electrode plate (31); The fourth electrode plate (32) is arranged in parallel with and spaced apart from the third electrode plate (31); the electrical polarity and the output voltage of the fourth electrode plate (32) are the same as those of the third electrode plate (31); an accelerating electric field is formed between the third electrode plate (31) and the fourth electrode plate (32); and the charged particles are accelerated into the dust collecting port (102) under the force of the electric field.

4. The electrostatic precipitator according to claim 3, characterized in that: The accelerating electric field module (30) is connected to a high-voltage direct current power supply; The third electrode plate (31) and the fourth electrode plate (32) are respectively connected to the high-voltage end of the same high-voltage DC power supply; or, the high-voltage DC power supply comprises a first high-voltage DC power supply (33) and a second high-voltage DC power supply (34) having the same output voltage, the third electrode plate (31) is connected to the high-voltage end of the first high-voltage DC power supply (33), and the fourth electrode plate (32) is connected to the high-voltage end of the second high-voltage DC power supply (34).

5. The electrostatic precipitator according to claim 3, characterized in that: The first electrode plate (21) and the third electrode plate (31) are sequentially arranged on one side of the dust removal chamber (100) along the airflow direction, and the second electrode plate (22) and the fourth electrode plate (32) are sequentially arranged on the other side of the dust removal chamber (100) along the airflow direction; The first electrode plate (21) and the third electrode plate (31) are separated by a first insulating structure (36), and the third electrode plate (31) and the fourth electrode plate (32) are separated by a second insulating structure (37).

6. The electrostatic precipitator according to claim 4, characterized in that: The first electrode plate (21), the second electrode plate (22), the third electrode plate (31), and the fourth electrode plate (32) are all metal plates; And / or, the accelerating electric field module (30) further comprises a grounded air outlet ring (35), the grounded air outlet ring (35) being arranged at the dust collecting port (102), the grounded air outlet ring (35) being connected to the low-voltage end of the high-voltage DC power supply and being grounded.

7. The electrostatic precipitator according to any one of claims 1 to 6, characterized in that: The corona discharge module (10) comprises a high-voltage discharge electrode (11) and a third high-voltage direct current power supply (12), wherein the high-voltage discharge electrode (11) comprises: a ring-shaped electrode (112) adapted to be connected to a low-voltage terminal of a third high-voltage DC power source (12); a needle-shaped electrode (111), located at the center of the ring-shaped electrode (112), the needle-shaped electrode (111) being suitable for connecting to the high-voltage end of the third high-voltage DC power supply (12); There is a set discharge distance between the needle-shaped electrode (111) and the inner ring surface of the ring-shaped electrode (112), there is a potential difference between the needle-shaped electrode (111) and the ring-shaped electrode (112), and the needle-shaped electrode (111) generates corona discharge under the action of the potential difference.

8. An air purification device, characterized in that: An electrostatic precipitator comprising the electrostatic precipitator according to any one of claims 1 to 7.

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