End insulator for electrostatic filter and electrostatic filter

Abstract

The application discloses an end insulation of an electrostatic filter and the electrostatic filter. The end insulation comprises a connecting cylinder part and a seat part. The cylinder part is sleeved outside the conductive rod and extends along the axial direction of the conductive rod. The seat part is connected to the outer side of the side plate and extends along the outer surface of the side plate. The cylinder part and the seat part of the end insulation are made of an electric arc resistant and insulating material. The creepage distance between the conductive rod and the corresponding side plate is at least the sum of the axial extension length of the cylinder part from the connection with the seat part and the radial extension length of the seat part from the connection with the cylinder part. The application can reduce the possibility of arc drawing by arranging the largest possible creepage distance between the conductive rod and the side plate, thereby improving the reliability of the end insulation.

Description

Technical Field

[0001] This application relates to an electrostatic filtration device for removing oil fumes from the air, and more specifically to an end insulator of an electrostatic filter and an electrostatic filter. Background Technology

[0002] Electrostatic filters utilize a high-voltage electrostatic field to charge particles (such as cooking fumes), which are then adsorbed by a collection plate to purify the gas. Specifically, an electrostatic filter includes several charged plates and several grounding plates, with an electric field formed between adjacent charged plates and grounding plates. This electric field charges the particles, which are then adsorbed and collected. Generally, the charged plates are electrically connected to a power source via conductive rods, thus charging the plates and creating an electric field with the grounded grounding plates. End insulation components are used to connect the charged conductive rods to the side plates of the electrostatic filter to support and position the conductive rods and the individual charged plates.

[0003] In existing electrostatic filters, there is a possibility of arcing at the end insulation parts, which can lead to breakage and failure of the end insulation parts, affecting their performance stability. Summary of the Invention

[0004] This application provides an end insulating member capable of significantly reducing the possibility of arcing. In a first aspect, this application provides an end insulating member for an electrostatic filter, the end insulating member being used to connect the end of a conductive rod of the electrostatic filter to a side plate of the electrostatic filter. The conductive rod is used for electrical connection to a power source. The end insulating member includes a connected cylindrical portion and a seat portion. The cylindrical portion is sleeved outside the conductive rod and extends axially along the conductive rod. The seat portion is connected to the outside of the side plate and extends along the outer surface of the side plate. Furthermore, the cylindrical portion and the seat portion of the end insulating member are made of an arc-resistant and insulating material, such that the creepage distance between the conductive rod and the corresponding side plate is at least the sum of the axial extension length of the cylindrical portion from its connection with the seat portion and the radial extension length of the seat portion from its connection with the cylindrical portion.

[0005] According to the first aspect above, the end insulator includes a chassis and a sleeve. The chassis includes the seat portion, and a seat portion channel is defined within the chassis. The sleeve includes the cylindrical portion and a flange, the flange being formed by radially projecting from the end of the cylindrical portion, and a cylindrical portion channel is defined within the sleeve. The conductive rod includes a connected end portion and a fastening nut. The seat portion channel and the cylindrical portion channel extend along the axial direction, the cylindrical portion is inserted into the seat portion channel, the end portion of the conductive rod is inserted into the cylindrical portion channel, and the fastening nut is connected to the outside of the flange, such that the chassis and the conductive rod are separated by the cylindrical portion and the flange.

[0006] According to the first aspect described above, the chassis further includes at least one claw portion. The seat portion has opposing inner and outer surfaces. The at least one claw portion is disposed on the inner surface of the seat portion. The at least one claw portion is configured to protrude axially toward the side plate to abut against the side plate. The surface of the at least one claw portion is configured to have a planar shape that conforms to the side plate. Each claw portion has a boss that protrudes axially from the surface of the claw portion to insert into a snap-fit ​​hole in the side plate, such that the end insulator is engaged with the side plate.

[0007] According to the first aspect above, the chassis further includes a seat sleeve, which extends axially from the outer surface of the seat and the extension length of the seat sleeve is set to accommodate the fastening nut of the conductive rod within the seat sleeve; the outer surface of the seat is provided with a plurality of reinforcing ribs, each of the reinforcing ribs protruding axially from the outer surface and extending radially or circumferentially.

[0008] According to the first aspect above, the chassis is made of an arc-resistant and insulating plastic material, and the sleeve is made of an arc-resistant, insulating, and flame-retardant plastic material.

[0009] According to the first aspect above, the arc-resistant, insulating, and flame-retardant plastic material used to make the sleeve is a Teflon plastic material.

[0010] According to the first aspect above, the sleeve is made of polytetrafluoroethylene-perfluoroalkoxy resin or polytetrafluoroethylene-fluorinated ethylene propylene resin by injection molding.

[0011] According to the first aspect above, the arc-resistant and insulating plastic material used to make the chassis is polyoxymethylene plastic.

[0012] According to the first aspect above, the chassis is made of copolymerized polyoxymethylene resin by injection molding.

[0013] This application provides an electrostatic filter in a second aspect, comprising a frame, a plurality of charged plates and a plurality of grounding plates, at least one conductive rod, and at least a pair of end insulators. The frame includes a first side plate and a second side plate disposed opposite to each other. The plurality of charged plates and the plurality of grounding plates are arranged alternately and spaced between the first side plate and the second side plate, wherein the plurality of charged plates are configured to be charged, and the plurality of grounding plates are configured to be grounded, such that an electric field is formed between adjacent charged plates and grounding plates. The at least one conductive rod extends axially, each conductive rod passing through and contacting a charged plate, such that the conductive rod can conduct power from a power source to each charged plate, thereby charging the plurality of charged plates. Each end insulator is as described in any of the first aspects, for connecting a pair of ends of the conductive rod to the first side plate and the second side plate, respectively. Attached Figure Description

[0014] Figure 1 This is an exploded perspective view of the electrostatic filter according to this application;

[0015] Figure 2A yes Figure 1 A three-dimensional structural diagram of the end insulator at one angle;

[0016] Figure 2B yes Figure 1 A three-dimensional structural diagram of the end insulator from another angle;

[0017] Figure 2C yes Figure 2A An exploded view of the end insulation component shown.

[0018] Figure 2D yes Figure 2A The end insulation shown is a cross-sectional view along line AA. Detailed Implementation

[0019] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although terms indicating direction, such as "front," "rear," "up," "down," "left," and "right," are used herein to describe various exemplary structural parts and elements, their use is merely for illustrative purposes and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed herein can be arranged in different orientations, these terms indicating direction are illustrative only and should not be considered limiting.

[0020] Figure 1 This is an exploded perspective view of the electrostatic filter 100 according to this application, used to illustrate the general structure of the electrostatic filter 100. For example... Figure 1As shown, the electrostatic filter 100 includes a frame 101, several charged plates, and several ground plates. The charged plates include several first electrode plates 116, and the ground plates include several second electrode plates 117. The frame 101 is generally cuboid in shape and includes first side plates 102 and second side plates 103 arranged opposite each other. The first side plates 102 and second side plates 103 are arranged generally parallel and spaced apart, and connected by four parallel support beams 113. The four support beams connect the first side plates 102 and second side plates 103 together from the front and rear sides of the top and bottom of the first side plates 102 and second side plates 103, respectively, to form a frame 101 that is open in the front-rear direction. The several first electrode plates 116 and the several second electrode plates 117 are arranged alternately and spaced apart between the first side plates 102 and second side plates 103. The first electrode plate 116 is used for electrical connection to a power source to be energized, and the second electrode plate 117 is used for grounding, so that an electrostatic field is formed between each adjacent first electrode plate 116 and second electrode plate 117. In this application, the first side plate 102, the second side plate 103, the first electrode plate 116, and the second electrode plate 117 are all made of metallic materials to ensure the structural stability of the electrostatic filter 100 and to ensure that an electric field can be formed between the first electrode plate 116 and the second electrode plate 117.

[0021] Thus, the airflow carrying oil fumes can enter the electrostatic filter 100 from the opening of the frame 101 in the front-back direction as shown by arrow 125, and flow through the electric field between the first electrode plates 116 and the second electrode plates 117, causing the oil fumes in the airflow to be ionized and separated and removed. Finally, the clean airflow flows out of the electrostatic filter 100 from the opening of the frame 101.

[0022] The charged plates also include several spaced-apart ionization plates 111, each ionization plate 111 being serrated. The grounding plates also include several spaced-apart grounding plates 112, each grounding plate 112 being flat. The ionization plates 111 and grounding plates 112 are also staggered and spaced apart between the first side plate 102 and the second side plate 103. The ionization plates 111 are also used for electrical connection to a power source to become energized, and the grounding plates 112 are also used for grounding, so that an electric field is also formed between each adjacent ionization plate 111 and grounding plate 112. In this application, the ionization plates 111 and grounding plates 112 are located upstream of the first electrode plate 116 and the second electrode plate 117, respectively, that is, the ionization plates 111 and grounding plates 112 are located at the edge of the electrostatic filter 100 near the air inlet side, so that the airflow is ionized when it enters the electrostatic filter 100, and then flows between the first electrode plate 116 and the second electrode plate 117.

[0023] In the electrostatic filter 100 shown in this embodiment, several charged plates and several grounding plates are supported and connected to a first side plate 102 and a second side plate 103 by several rods. These rods include a first connecting rod 122 and a second connecting rod 123, each of which extends axially. In this embodiment, the first side plate 102, the second side plate 103, the ionization plate 111 and the grounding plate 112, as well as the first electrode plate 116 and the second electrode plate 117 are arranged substantially parallel to each other. Each first connecting rod 122 passes vertically through the first electrode plate 116 and the ionization plate 111, and each second connecting rod 123 passes vertically through the second electrode plate 117 and the grounding plate 112. The two ends of the first connecting rod 122 and the second connecting rod 123 are connected to the first side plate 102 and the second side plate 103 by fasteners.

[0024] Specifically, the first connecting rod 122 passes through and contacts the first electrode plates 116 and ionizer plates 111 to support and connect them to the first side plate 102 and the second side plate 103. The first connecting rod 122 also passes through the second electrode plates 117 and grounding plates 112, but does not contact them to prevent electrical conduction between the charged plate and the grounding plate, thus preventing the formation of an electric field. In some embodiments, the charged plate has a contact hole 114 with the same diameter as the outer diameter of the first connecting rod 122, allowing the first connecting rod 122 to contact the wall of the contact hole 114 when it passes through it. Furthermore, the ground plane has non-contact holes 115 larger than the first connecting rod 122. For example, the diameter of the non-contact hole 115 is much larger than the outer diameter of the first connecting rod 122, so that the first connecting rod 122 can pass through the non-contact hole 115 without contacting the hole wall. Similarly, the second connecting rod 123 is used to pass through the contact holes 114 of each ground plane and contact the ground plane to support and connect the ground plane to the first side plate 102 and the second side plate 103. The second connecting rod 123 also passes through the non-contact holes 115 on each live plate, so that the second connecting rod 123 does not contact the live plate.

[0025] At least one of these first connecting rods 122 is a conductive rod 105 made of a metallic material, used to conduct power from the power source to each charged plate, so that the first electrode plate 116 and the ionizer 111 can be charged, for example, making the first electrode plate 116 an anode plate. As an alternative embodiment, a portion of these first connecting rods 122 is a conductive rod 105, while another portion is a non-conductive rod made of a non-metallic material, such as insulating plastic, so that the non-conductive rod essentially only serves to support and connect the charged plates and is not used to conduct current.

[0026] In some embodiments, a portion of these second connecting rods 123, while non-conductive, may be made of a metallic material to allow the potentials between the respective grounding plates to be interconnected, for example, all with a potential of 0. In this embodiment, the electrostatic filter 100 also includes a grounding connector 118, which extends axially and is used for grounding. Each grounding plate 112 is connected to the grounding connector 118 to ground the grounding plate 112.

[0027] Since the side plates of the electrostatic filter 100 need to be grounded, in order to mount the conductive rods 105 onto the side plates, the electrostatic filter 100 also needs to include at least one pair of end insulating members 110 for mounting the conductive rods 105. Each conductive rod 105 has a pair of end rod portions 106. At least one pair of end insulating members 110 are used to connect the pair of end rod portions 106 of the conductive rod 105 to the first side plate 102 and the second side plate 103, respectively. The end insulating members 110 are made of insulating material. By providing the end insulating members 110, the conductive rod 105 can avoid contact with the first side plate 102 and the second side plate 103, but can still be connected to the first side plate 102 and the second side plate 103 to prevent the conductive rod 105 from conducting current to the side plates. Specifically, the first side plate 102 and the second side plate 103 are provided with a plurality of snap-fit ​​holes 121, and the first side plate 102 and the second side plate 103 are also provided with non-contact holes 115 for the end rod portions 106 of the conductive rod 105 to pass through. The end insulator 110 is positioned and engaged with the corresponding side plate via the snap-fit ​​hole 121. The end portion 106 of the conductive rod 105 passes through the non-contact hole 115 to exit the corresponding side plate and passes through the end insulator 110. In this embodiment, the pair of end portions 106 of the conductive rod 105 are threaded, and the fastening nut 107 fastens the conductive rod 105 together with the end insulator 110 to the outside of the corresponding side plate from the outside of the corresponding side plate, thereby connecting the conductive rod 105 to the corresponding side plate. A more specific structure of the end insulator 110 will be described in conjunction with... Figures 2A-2D Provide a detailed description.

[0028] The electrostatic filter 100 also includes a plurality of spacer tubes 128, which are sleeved on the outside of the first connecting rod 122 and the second connecting rod 123. The outer diameter of the spacer tube 128 is larger than the diameter of the contact hole 114 and smaller than the diameter of the non-contact hole 115, so that the spacer tube 128 can be maintained between adjacent charged plates, adjacent ground plates, or adjacent charged plates or ground plates and their corresponding side plates. In this application, the distance between adjacent charged plates, ground plates, and corresponding side plates can be set to the required length according to the length of the spacer tube 128.

[0029] When the electrostatic filter 100 is in operation, a non-uniform electric field is generated between adjacent ionization plates 111 and grounding plates 112, while a uniform electric field is formed between adjacent first plates 116 and second plates 117. When gas enters the electrostatic filter 100 through the front opening of the frame 101, it first flows through the non-uniform electric field generated between the ionization plates 111 and grounding plates 112. Under the influence of this non-uniform electric field, particles in the gas acquire positive or negative charges. Then, the gas carrying positive or negative charges enters the uniform electric field between the first plates 116 and second plates 117. Under the influence of this uniform electric field, negatively and positively charged particles move towards and are adsorbed by the first plate 116, while positively charged particles move towards and are adsorbed by the second plate 117. Thus, the particles in the gas are adsorbed and removed, achieving the purpose of purifying the gas.

[0030] Figures 2A-2D The specific structure of the end insulator 110 is shown. Figure 2A This shows a three-dimensional structural view of the end insulator 110 as viewed from the outside in. Figure 2B The diagram shows a three-dimensional view of the end insulator 110 as viewed from the inside out. Figure 2C An exploded view of the end insulator 110 is shown. Figure 2D A cross-sectional view of the end insulator 110 along line AA is shown. Figures 2A-2D As shown, in this embodiment, the end insulating member 110 includes a cylindrical portion 232 and a seat portion 242. The cylindrical portion 232 extends along the axis x and is used to sleeve the outer side of the end rod portion 106 of the conductive rod 105. The seat portion 242 extends radially perpendicular to the axis x and is used to connect with a corresponding side plate. In this embodiment, the end insulating member 110 includes a separately formed base 241 and a sleeve 231. The base 241 includes the seat portion 242, and the sleeve 231 includes the cylindrical portion 232. By providing a separately formed base 241 and sleeve 231, the base 241 and sleeve 231 can be made of different materials. In other embodiments, the base 241 and sleeve 231 can also be integrally made of the same insulating material.

[0031] Specifically, the seat portion 242 has opposing inner surfaces 246 and outer surfaces 245, with the inner surface 246 facing the corresponding side plate and the outer surface 245 away from the side plate. The chassis 241 defines a seat portion channel 248, which is located at the center of the chassis 241 and extends axially through the inner surface 246 and the outer surface 245.

[0032] The chassis 241 includes at least one claw portion 243 disposed on the inner surface 246 of the seat portion 242 and protruding axially from the inner surface 246 toward a corresponding side plate. Each claw portion 243 has a boss 244 that further protrudes toward the corresponding side plate. The surface of each claw portion 243 is configured to have a planar shape that conforms to the corresponding side plate, and the surface of each claw portion 243 is substantially flush, so that the surfaces of each claw portion 243 can abut together with the side plate. When the claw portion 243 abuts the side plate, the boss 244 is used to insert into a snap-fit ​​hole 121 on the side plate, so that the end insulator 110 can engage with the side plate. In this embodiment, at least one claw portion 243 includes three claw portions 243 disposed around the edge of the seat portion 242 around the seat portion channel 248.

[0033] The chassis 241 also includes a seat sleeve 247, which is disposed on the outer surface 245 of the seat portion 242 and extends axially away from the side plate from the outer surface 245. The seat sleeve 247 extends outward by a certain length so that the fastening nut 107 can be accommodated within the seat sleeve 247. Several reinforcing ribs 249 are also provided on the outer surface 245 of the seat portion 242, which protrude axially from the outer surface 245 and extend radially or circumferentially. In this embodiment, the seat sleeve 247 and the seat channel 248 are coaxially arranged, and the seat sleeve 247 surrounds the seat channel 248. The reinforcing ribs 249 are arranged in several turns around the seat sleeve 247 and the seat channel 248, and are arranged alternately in radial and circumferential directions.

[0034] Sleeve 231 includes a cylindrical portion 232 and a flange 233. The cylindrical portion 232 extends axially and is sized to match the dimensions of the seat channel 248 of the chassis 241, allowing the cylindrical portion 232 to be inserted into the seat channel 248. Sleeve 231 defines a cylindrical channel 238 extending therethrough. The cylindrical channel 238 also extends axially and is sized to match the dimensions of the end portion 106 of the conductive rod 105, allowing the end portion 106 to be inserted into the cylindrical channel 238. The flange 233 is formed by a radially projecting end edge of the cylindrical portion 232. Because the flange 233 is larger than the seat channel 248, when the cylindrical portion 232 is inserted into the seat channel 248, the flange 233 cannot be inserted into the seat channel 248 but instead abuts against the outer surface 245 of the seat portion 242. The flange 233 is sized to be smaller than the seat sleeve 247 but larger than the fastening nut 107. Therefore, when the fastening nut 107 is connected to the end portion 106 of the conductive rod 105, the fastening nut 107 is connected to the outside of the flange 233, thereby allowing the chassis 241 and the conductive rod 105 to be separated axially by the sleeve 232 and radially by the flange 233.

[0035] In this embodiment, both the base 241 and the sleeve 231 of the end insulating member 110 are made of insulating material. In some embodiments, the base 241 is made of an arc-resistant and insulating plastic material, while the sleeve 231 is made of an arc-resistant, insulating, and flame-retardant plastic material. The base 241 and sleeve 231 made of plastic material are easy to process; for example, the end insulating member 110 can be manufactured to meet dimensional requirements using conventional plastic processing techniques such as injection molding.

[0036] In this embodiment, the chassis 241 and the conductive rod 105 are completely separated by the sleeve 231. Therefore, only the sleeve 231 needs to have sufficient flame retardancy to meet safety requirements, while the chassis 241 does not need to meet sufficiently high flame retardancy. In some specific embodiments, the sleeve 231 is made of Teflon plastic material, such as polytetrafluoroethylene-perfluoroalkoxy resin or polytetrafluoroethylene-fluorinated ethylene propylene resin, manufactured through molding and sintering processes, machining processes, or injection molding processes. These Teflon plastic materials have a V0 flame retardancy rating, can withstand high temperatures up to 200°C, and have an arc resistance of PLC3 (ASTM D495). The chassis 241 is made of polyoxymethylene plastic, such as copolymerized polyoxymethylene resin, manufactured through injection molding. The polyoxymethylene resin material has a flame retardancy rating of HB, a temperature resistance of 90°C, and an arc resistance of PLC4 (ASTM D495). In some other embodiments, the chassis 241 and the sleeve 231 may both be made of Teflon plastic, or the chassis 241 and the sleeve 231 may be made of Teflon plastic as a single piece.

[0037] By using insulating materials for the base 241 and sleeve 231 of the end insulator 110, the creepage distance between the end rod 106 of the conductive rod 105 and the side plate is at least the sum of the axial inward extension length of the connection between the cylinder 232 and the seat 242 and the shortest radial extension length of the seat 242 from its connection with the cylinder 232. Here, creepage distance refers to the shortest distance along the surface of the insulating material between two conductive components. That is, the shortest distance along the surface of the end insulator 110 between the end rod 106 of the conductive rod 105 and the corresponding side plate.

[0038] Further integration Figure 2DAs shown, since the conductive rod 105 is inserted into the cylindrical channel 238, the shortest distance along the insulating material surface between the conductive rod 105 and the corresponding side plate, viewed from the inner surface 246 of the seat 242, includes not only the shortest radial extension of the seat 242 but also a portion of the axial extension of the cylindrical portion 232. Viewed from the outer surface 245 of the seat 242, the shortest distance along the insulating material surface between the conductive rod 105 and the corresponding side plate includes the axial extension of the cylindrical portion 232, the length of the seat sleeve 247, and the radial length of the outer surface 245 of the seat 242. Furthermore, since several reinforcing ribs 249 are provided on the outer surface 245, the creepage distance in the direction of the outer surface 245 of the seat 242 is longer. Therefore, the creepage distance between the conductive rod 105 and the corresponding side plate is at least the sum of the shortest radial extension of the seat 242 from its connection with the cylindrical portion 232 and the axial extension of the cylindrical portion 232 from its connection with the seat 242.

[0039] During the operation of an electrostatic filter, the conductive rod often carries a high-voltage current. If it encounters a humid working environment or damp flue gas, strong arcing can easily occur at the end insulation, leading to its failure and affecting its performance stability. On the other hand, the end insulation also requires high dimensional accuracy to prevent leakage from causing the side plate to become electrified.

[0040] This application improves the reliability of the end insulation component by setting the largest possible creepage distance between the conductive rod and the side plate, thereby reducing the possibility of arcing. Furthermore, when the chassis of the end insulation component is made of polyoxymethylene resin and the sleeve is made of Teflon plastic, the low surface energy of these plastic materials makes condensation less likely, further reducing the possibility of arcing. In addition, plastic end insulation components are lightweight, simple to manufacture, and easy to control in terms of quality, meeting dimensional accuracy requirements. Moreover, plastic end insulation components also have good oil and acid / alkali resistance, making them particularly suitable for electrostatic filters used to filter oil fumes.

[0041] Furthermore, by providing a flange on the sleeve to completely separate the conductive rod and the chassis, this application ensures the performance stability of the end insulation component by only requiring the sleeve to meet high requirements for insulation, flame retardancy, high temperature resistance, and arc resistance. Therefore, this application sets the chassis and sleeve of the end insulation component as two separate parts, with the sleeve made of more expensive Teflon plastic and the chassis made of less expensive polyoxymethylene resin. This approach, while meeting the performance requirements of the end insulation component, also reduces costs compared to end insulation components made entirely of Teflon plastic or other materials (such as ceramic materials).

[0042] Furthermore, during the installation of electrostatic filters, multiple spacer tubes are typically used to ensure a defined distance between each first and second electrode plate. However, in actual installation, the spacer tubes between the side plates and adjacent electrodes often require cutting compensation due to the accumulated tolerances of multiple spacer tubes. Using sleeves made of plastic material can both increase the creepage distance and facilitate cutting to compensate for the accumulated tolerances of the spacer tubes, thereby improving the efficiency of the installation work.

[0043] A chassis is made of polyoxymethylene resin by injection molding, and a sleeve is made of Teflon plastic by injection molding. The sleeve is then inserted into the chassis to obtain the end insulation component of this application (hereinafter referred to as the plastic end insulation component).

[0044] Ceramic materials, including cordierite, are sintered to form end insulation components (hereinafter referred to as ceramic end insulation components) with the same shape as the chassis.

[0045] The performance of the plastic end insulator and the ceramic end insulator of this application was compared, and the results are shown below:

[0046] Hot oil corrosion resistance

[0047] After immersing the plastic and ceramic end in a mixture of 50% soybean oil and 50% pork fat at 90℃ for 168 hours, neither the plastic nor ceramic end insulators cracked or deformed, indicating that both are suitable for use in electrostatic filters in hot oil fume environments.

[0048] Hot alkali corrosion resistance

[0049] After immersing the plastic and ceramic end insulators in a 1% sodium hydroxide solution (pH 14) at 60°C for 168 hours, neither the plastic nor ceramic end insulators cracked or deformed, and their insulation performance remained unchanged. This indicates that cleaning the electrostatic filter in a hot alkaline solution does not affect the plastic or ceramic end insulators.

[0050] High voltage electric shock performance

[0051] The plastic end insulator can withstand a 20kV high-voltage shock without breaking down or cracking. The ceramic end insulator can withstand a 13kV high-voltage shock without breaking down or cracking, indicating that both plastic and ceramic end insulators have good resistance to high-voltage breakdown.

[0052] Extreme temperature performance

[0053] The plastic end insulation was placed in an environment that cycled from -40°C for 3 hours to 90°C for 3 hours for 100 cycles, and then immediately dropped from a height of 1m three times. The plastic end insulation did not crack.

[0054] The ceramic end insulator was placed in an environment that cycled from -40°C for 3 hours to 90°C for 3 hours for 100 cycles, and then immediately dropped from a height of 1m three times. The ceramic end insulator cracked.

[0055] This indicates that plastic end insulators have better resistance to extreme temperatures than ceramic end insulators, and their performance is not affected under extreme temperature conditions.

[0056] Does arcing occur?

[0057] The plastic and ceramic end insulators were tested in a simulated operating environment to determine whether arcing occurred. The plastic end insulator was placed in a -20°C environment for 48 hours to cool completely, and then placed in a normal temperature environment with a humidity of 70%-90% and powered on. The results showed that the plastic end insulator had slight condensation, but no arcing occurred.

[0058] The ceramic end insulator was placed in a -20℃ low temperature environment for 48 hours to cool completely, and then placed in a normal temperature environment with a humidity of 70%-90% and energized. As a result, the ceramic end insulator was severely condensed and produced a strong and continuous arcing phenomenon.

[0059] tensile arc resistance

[0060] Repeatedly spray a 0.1% ammonium chloride solution onto the surfaces of the plastic and ceramic end insulators, and then repeatedly draw arcs at the edges and center of the chassis of the plastic and ceramic end insulators.

[0061] Both plastic and ceramic end insulators can withstand more than 200 arc pulls without any surface damage.

[0062] The comparison results above show that both plastic and ceramic end insulators meet the requirements for hot oil corrosion resistance, hot alkali corrosion resistance, high-voltage electric shock resistance, and arc resistance. Plastic end insulators also meet the requirements for extreme temperature performance and arc resistance. Ceramic end insulators, however, cannot meet all these performance requirements.

[0063] Furthermore, the 28 end insulating components of this application were installed on seven electrostatic filters and continuously used for 8760 hours under outdoor conditions in Guangzhou and Wuxi. The results showed that no arcing or cracking occurred in any of the end insulating components, indicating that the end insulating components have stable performance and good reliability.

[0064] Although this disclosure has been described in conjunction with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or now or soon to be foreseen, will likely be apparent to those skilled in the art. Therefore, the examples of embodiments of this disclosure set forth above are intended to be illustrative rather than restrictive. Various changes can be made without departing from the spirit or scope of this disclosure. Therefore, this disclosure is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents. The technical effects and problems described in this specification are exemplary rather than restrictive. It should be noted that the embodiments described in this specification may have other technical effects and may solve other technical problems.

Claims

1. An end insulating member for an electrostatic filter, said end insulating member (110) for connecting the end of a conductive rod (105) of an electrostatic filter (100) to a side plate (102, 103) of the electrostatic filter (100), said conductive rod (105) for electrical connection to a power source, characterized in that: The end insulating member (110) includes a cylindrical portion (232) and a seat portion (242) connected to each other. The cylindrical portion (232) is sleeved on the outside of the conductive rod (105) and extends along the axial direction of the conductive rod (105). The seat portion (242) is connected to the outside of the side plates (102, 103) and extends along the outer surface of the side plates (102, 103). The cylindrical portion (232) and the seat portion (242) of the end insulating member (110) are made of an arc-resistant and insulating material; The creepage distance between the conductive rod (105) and the corresponding side plate (102, 103) is at least the sum of the axial extension length of the cylindrical portion (232) from the connection with the seat portion (242) inward and the radial extension length of the seat portion (242) from the connection with the cylindrical portion (232) outward; The end insulator (110) includes a chassis (241) and at least one claw (243). The chassis (241) includes a seat (242) having opposing inner surfaces (246) and outer surfaces (245). The at least one claw (243) is disposed on the inner surface (246) of the seat (242) and protrudes toward the side plates (102, 103), and is configured to abut against the side plates (102, 103). Each of the claw portions (243) has a boss (244) that protrudes from the surface of the claw portion (243) and is configured to be inserted into a snap-fit ​​hole (121) of the side plate (102, 103) so that the end insulator (110) engages with the side plate (102, 103).

2. The end insulating member according to claim 1, characterized in that: The end insulating member (110) further includes a sleeve (231), the sleeve (231) including the cylindrical portion (232) and a flange (233), the flange (233) being formed by radially protruding from the end of the cylindrical portion (232), the sleeve (231) defining a cylindrical portion channel (238), and the chassis (241) defining a seat portion channel (248). The conductive rod (105) includes an end rod portion (106) and a fastening nut (107) connected to each other. The seat channel (248) and the cylindrical channel (238) extend along the axial direction. The cylindrical part (232) is inserted into the seat channel (248). The end part (106) of the conductive rod (105) is inserted into the cylindrical channel (238). The fastening nut (107) is connected to the outside of the flange (233) so that the chassis (241) and the conductive rod (105) are separated by the cylindrical part (232) and the flange (233).

3. The end insulating member according to claim 2, characterized in that: The surface of at least one claw (243) is configured to have a planar shape that fits against the side plates (102, 103).

4. The end insulating member according to claim 1, characterized in that: The chassis (241) also includes a seat sleeve (247), which extends axially from the outer surface (245) of the seat (242). The extension length of the seat sleeve (247) is set to accommodate the fastening nut (107) of the conductive rod (105) within the seat sleeve (247). The outer surface (245) of the seat (242) is provided with a plurality of reinforcing ribs (249), each of the reinforcing ribs (249) protruding axially from the outer surface (245) and extending radially or circumferentially.

5. The end insulating member according to claim 2, characterized in that: The chassis (241) is made of an arc-resistant and insulating plastic material, and the sleeve (231) is made of an arc-resistant, insulating and flame-retardant plastic material.

6. The end insulator according to claim 5, characterized in that: The arc-resistant, insulating, and flame-retardant plastic material used to make the sleeve (231) is Teflon plastic material.

7. The end insulating member according to claim 6, characterized in that: The sleeve (231) is made of polytetrafluoroethylene-perfluoroalkoxy resin or polytetrafluoroethylene-fluorinated ethylene propylene resin by injection molding.

8. The end insulator according to claim 5, characterized in that: The arc-resistant and insulating plastic material used to make the chassis (241) is polyoxymethylene plastic.

9. The end insulator according to claim 8, characterized in that: The chassis (241) is made of copolymerized polyoxymethylene resin by injection molding.

10. An electrostatic filter, characterized in that... include: The frame (101) includes a first side plate (102) and a second side plate (103) disposed opposite to each other. A plurality of charged plates (111, 116) and a plurality of ground plates (112, 117) are arranged alternately between the first side plate (102) and the second side plate (103), wherein the plurality of charged plates (111, 116) are configured to be charged and the plurality of ground plates (112, 117) are configured to be grounded, such that an electric field is formed between adjacent charged plates (111, 116) and ground plates (112, 117); At least one conductive rod (105) extends axially, each of the conductive rods (105) passing through and contacting the respective charged plates (111, 116) such that the conductive rod (105) can conduct power from a power source to each of the charged plates (111, 116), thereby energizing the plurality of charged plates (111, 116); and At least one pair of end insulators (110), each of the end insulators (110) being as described in any one of claims 1-9, and connecting a pair of ends of the conductive rod (105) to the first side plate (102) and the second side plate (103), respectively.

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