Discharge electrode for electrostatic trap and electrostatic trap

Abstract

The utility model belongs to the field of ionization electrodes for separating dispersed particles from gas by using an electrostatic effect, and particularly relates to a discharge electrode for an electrostatic trap and the electrostatic trap. The discharge electrode for the electrostatic trap comprises an electrode body, one end of the electrode body is provided with a fixing structure used for being fixed to an electrode fixing pipe of the electrostatic trap, the electrode body comprises a cylindrical discharge section used for discharging, the periphery of the cylindrical discharge section is provided with external threads, and threads of the external threads form a continuous discharge tip. The cylindrical structure can increase the wall thickness of the discharge electrode, so that the discharge electrode is not easy to wear or deform, the service life is prolonged, and meanwhile, the thread of the external thread can form a discharge tip, so that discharge occurs at the spiral end, the charge density is improved, and the electric field distribution is more uniform.

Description

Technical Field

[0001] The utility model relates to a discharge electrode for an electrostatic collector and the electrostatic collector, belonging to the field of ionization electrodes for separating dispersed particles from gas by utilizing electrostatic effect. Background Art

[0002] Electrostatic collectors are widely used in flue gas analysis, industrial exhaust purification, dust control and other fields. They use electrostatic force to separate suspended particles and droplets from airflow. Corona discharge is generated by the metal discharge electrode under the action of high DC voltage, so that the dust particles in the dust-laden gas are charged and migrate to the dust collecting electrode under the action of the electric field force, thereby achieving gas purification.

[0003] An electrostatic collector primarily consists of a discharge electrode and a dust collecting electrode. The dust collecting electrode is typically tubular, located within the electrode and coaxial with it. One end of the discharge electrode is fixed to the electrode fixing tube of the electrostatic collector, while the other end is cantilevered within the dust collecting electrode. Typically, the discharge electrode comprises an electrode body, which includes a discharge segment for discharge. The discharge segment is cantilevered within the dust collecting electrode to form an electric field. A fixing structure is provided at the end of the electrode body away from the discharge segment, securing the electrode body to the electrode fixing tube via the fixing structure, thereby securing the discharge electrode within the electrostatic collector.

[0004] In existing electrostatic collectors, some discharge poles are needle-shaped, such as an air purification device disclosed in the Chinese utility model patent with authorization announcement number CN2671687Y and authorization announcement date 2005.01.19. The discharge electrode in the device includes multiple discharge needles (i.e., discharge bodies) for discharge. The tips of the discharge needles can generate corona balls. One end of the discharge needles is fixed on the discharge electrode seat. Although the discharge intensity of the needle tip is high, the wall thickness of the needle tip is small and the structural strength is poor. It is easy to deform and wear when colliding with other components during transportation and disassembly; some discharge poles are cylindrical, such as the electrostatic dust removal device disclosed in the Chinese utility model patent with authorization announcement number CN211756004U and authorization announcement date 2020.10.23. The discharge pole in the device is a smooth cylindrical shape. The structural strength of this discharge electrode is good and it is not easy to deform and wear, but it has fewer tips, weaker discharge intensity, and low capture efficiency.

[0005] Therefore, a new discharge electrode for an electrostatic collector is proposed, which is not easily deformed and worn and can increase the charge density. Utility Model Content

[0006] The purpose of the present invention is to provide a discharge electrode for an electrostatic collector to solve the problem of easy deformation or low charge intensity of the discharge electrode in the existing electrostatic collector. The present invention also provides an electrostatic collector to solve the same problem as above.

[0007] To achieve the above-mentioned purpose, the discharge electrode for the electrostatic collector in the present invention adopts the following technical solutions:

[0008] A discharge electrode for an electrostatic collector comprises an electrode body, one end of the electrode body being provided with a fixing structure for fixing to an electrode fixing tube of the electrostatic collector, the electrode body comprising a cylindrical discharge segment for discharging, the outer circumference of the cylindrical discharge segment being provided with an external thread, the threads of the external thread forming a continuous discharge tip.

[0009] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, in which the discharge electrode includes an electrode body, which is fixed to the electrode fixing tube of the electrostatic collector via a fixing structure. The electrode body also includes a cylindrical discharge segment for discharge. The cylindrical structure increases the wall thickness of the discharge electrode, enhancing its strength, making the cylindrical discharge segment less susceptible to wear and deformation, and extending the service life of the discharge electrode. The arc-shaped discharge segment is provided with an external thread, and the threads of the external thread form a discharge tip, which causes discharge to occur at the end of the spiral, increasing charge density, making the electric field distribution more uniform, and improving collection efficiency.

[0010] Furthermore, the axial length of the external thread is equal to the axial length of the cylindrical discharge segment.

[0011] Furthermore, the external thread is a triangular thread.

[0012] Furthermore, the discharge electrode also includes an electrode seat detachably connected to the electrode body through a threaded structure, and the electrode seat is used to be fixed on the electrode fixing tube of the electrostatic collector and constitute the fixing structure.

[0013] Furthermore, the axial length of the external thread is 4.5 to 6.5 cm, and the axial length of the electrode holder is 2.5 to 3.5 cm.

[0014] To achieve the above objectives, the electrostatic collector in the present invention adopts the following technical solutions:

[0015] An electrostatic collector includes an electrode fixing tube and a discharge electrode fixed on the electrode fixing tube. The discharge electrode includes an electrode body. One end of the electrode body is provided with a fixing structure for fixing to the electrode fixing tube of the electrostatic collector. The electrode body includes a cylindrical discharge segment for discharging. The outer circumference of the cylindrical discharge segment is provided with an external thread. The threads of the external thread constitute a continuous discharge tip.

[0016] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, in which the discharge electrode includes an electrode body, which is fixed to the electrode fixing tube of the electrostatic collector via a fixing structure. The electrode body also includes a cylindrical discharge segment for discharge. The cylindrical structure increases the wall thickness of the discharge electrode, enhancing its strength, making the cylindrical discharge segment less susceptible to wear and deformation, and extending the service life of the discharge electrode. The arc-shaped discharge segment is provided with an external thread, and the threads of the external thread form a discharge tip, which causes discharge to occur at the end of the spiral, increasing charge density, making the electric field distribution more uniform, and improving collection efficiency.

[0017] Furthermore, the axial length of the external thread is equal to the axial length of the cylindrical discharge segment.

[0018] Furthermore, the external thread is a triangular thread.

[0019] Furthermore, the discharge electrode also includes an electrode seat detachably connected to the electrode body through a threaded structure, and the electrode seat is used to be fixed on the electrode fixing tube of the electrostatic collector and constitute the fixing structure.

[0020] Furthermore, the axial length of the external thread is 4.5 to 6.5 cm, and the axial length of the electrode holder is 2.5 to 3.5 cm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an embodiment of a discharge electrode for an electrostatic collector in the present invention.

[0022] In the figure: 1. electrode holder; 2. sealing ring; 3. electrode body; 31. threaded connection section; 32. square rod section; 33. discharge section; 34. external thread. DETAILED DESCRIPTION

[0023] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0024] In response to the technical problems existing in the prior art, the basic technical concept of the present invention is: setting the discharge segment in the discharge electrode to a cylindrical shape so that the discharge electrode is not easily deformed, and setting an external thread on the surface of the cylindrical discharge segment so that the threads of the external thread form a continuous discharge tip, thereby increasing the charge density and enhancing the discharge intensity.

[0025] Embodiments of the discharge electrode for electrostatic collector in the present invention:

[0026] like Figure 1As shown, the discharge electrode for an electrostatic collector (hereinafter referred to as the "discharge electrode") includes an electrode body 3. One end of the electrode body 3 is provided with a fixing structure for fixing to the electrode fixing tube of the electrostatic collector. The electrode body 3 includes a cylindrical discharge segment 33 for discharge. The cylindrical structure increases the wall thickness of the discharge electrode, enhances the strength of the discharge electrode, and makes the cylindrical discharge segment less susceptible to wear or deformation, thereby extending its service life. The cylindrical discharge segment 33 is provided with an external thread 34, and the threads of the external thread 34 form a continuous discharge tip. As a result, discharge occurs at the end of the spiral, increasing the charge density, making the electric field distribution more uniform, and improving the collection efficiency. In this embodiment, the external thread 34 is a triangular thread. The axial length of the external thread 34 is equal to the axial length of the cylindrical discharge segment 33. This is the optimal arrangement, with the most discharge tips and the highest collection efficiency.

[0027] like Figure 1 As shown, the discharge electrode also includes an electrode holder 1 that is detachably connected to the electrode body 3 through a threaded structure, and the electrode holder 1 is cylindrical. Specifically, the discharge electrode includes a threaded connection section 31, and the electrode holder 1 includes a threaded matching section that matches the threaded connection section 31, wherein the threaded connection section 31 has an external thread and the threaded matching section is an internal threaded hole. The electrode holder 1 constitutes a fixed structure for fixing the discharge electrode on the electrode fixing tube of the electrostatic collector. When in use, the discharge electrode is fixed in the electrode fixing tube in the electrostatic collector through the electrode holder 1. Since the electrode holder 1 and the electrode body 3 are threadedly connected, when the discharge electrode needs to be cleaned and maintained, it is only necessary to unscrew the electrode body 3 from the electrode holder 1 without disassembling the electrode holder 1. In addition, the friction force of the unscrewing is small, making the disassembly of the discharge body effortless, simple and convenient.

[0028] The electrode holder 1 is fitted with a sealing ring 2 near the threaded engagement section. An annular groove is provided corresponding to the sealing ring 2. The sealing ring 2 fits within the groove. During installation, the sealing ring 2 creates an interference fit with the inner wall of the electrode mounting tube, securing the discharge electrode. The electrode body 3 also includes a square rod section 32 located between the cylindrical discharge section 33 and the threaded connection section 31. This provides a location for the operating tool to apply force when tightening the electrode body 3.

[0029] The axial length of the external thread is 4.5 to 6.5 cm, and the axial length of the electrode holder is 2.5 to 3.5 cm. In this embodiment, the axial length of the electrode holder 1 is 3 cm and the diameter is 0.8 cm, and the axial length of the cylindrical discharge segment is 5 cm and the diameter is 5 mm, that is, the axial length of the external thread is 5 cm and the diameter is 5 mm. Such dimensions can ensure sufficient electric field strength and mechanical strength, while also taking into account manufacturing costs and process feasibility. The electrode body 3 is made of the same material as the electrode holder 1, and pure copper or other corrosion-resistant conductive materials can be selected. The electrode holder 1 can be in contact with and connected to the power line, and transfer current to the electrode body 3, so that the electrode body 3 generates corona current.

[0030] During use: The discharge electrode can be fixed to the electrode fixing tube in the electrostatic collector via the electrode holder 1. The electrode body 3 is screwed onto the electrode holder 1. The electrode holder 1 is connected to the power supply and transmits current to the electrode body, energizing the cylindrical discharge segment 33. The threads of the external thread 34 form the discharge tip, forming an electric field within the dust collecting electrode. After the flue gas enters the dust collecting electrode, harmful particles and other substances in it will be charged by the electric field and move toward the dust collecting electrode, thereby purifying the flue gas. When the discharge electrode needs to be cleaned and maintained, only the electrode body 3 needs to be unscrewed without removing the electrode holder, which is simple and convenient.

[0031] A smoking experiment was conducted using the discharge electrode for an electrostatic collector according to the present invention. First, the electrode body 3 was screwed onto the electrode holder 1, and then connected to the electrostatic collector tube and an absorption bottle containing methanol placed in a dry ice / isopropyl alcohol cold trap. The voltage was adjusted to -17.5 kV.

[0032] Using the ISO standard puffing mode, with one puff every 60 seconds, a puff volume of 35 mL per puff, and a puff duration of 2 seconds, 5 reference cigarettes were smoked, and the smoke aerosol particulate nicotine and gaseous nicotine were captured by an electrostatic capture device and an absorption bottle, respectively.

[0033] After smoking five cigarettes, wash the electrostatic trap tube with 20 mL of methanol to obtain a particulate nicotine methanol solution. Transfer a certain amount to a chromatographic vial, add the quinoline-methanol internal standard solution, and seal the vial for testing. Simultaneously, remove a certain amount of vapor-phase nicotine methanol from the absorption vial and transfer it to a chromatographic vial. Add the quinoline-methanol internal standard solution and seal the vial for testing.

[0034] Determination Method: The obtained gas-phase and particulate nicotine samples were analyzed by GC-MS, using an FID detector, a DB-5MS column (30m x 0.25μm x 0.25), helium as the carrier gas, a flow rate of 6mL / min, and a 10μL injection volume. The column temperature was 50°C. The temperature program was: 70°C for 1 minute, then 10°C / min to 250°C, and then hold for 1 minute. The mass spectrometer used an electrospray ionization (ESI) source, positive ionization, and selected ion scanning (SIM) as the scanning mode. The molecular ion peaks were: nicotine (m / z 84, m / z 133, m / z 162) and quinoline (m / z 102, m / z 129). The ion source temperature was 230°C, the MS quadrupole temperature was 180°C, and the carrier gas was high-purity helium.

[0035] The nicotine gas-particle distribution of the reference cigarette is used for further explanation:

[0036] As shown in Table 1, which shows the nicotine distribution results of five reference cigarettes smoked under the ISO standard puffing mode using an electrostatic capture device equipped with the discharge electrode of the present invention, the average vapor-phase nicotine release was 4.35 μg / cig, and the average particle-phase nicotine release was 1027.14 μg / cig. As shown in Table 2, using an electrostatic capture device equipped with a needle-type electrode, under the same experimental conditions, the average vapor-phase nicotine release of the reference cigarettes was 5.23 μg / cig, and the average particle-phase nicotine release was 944.99 μg / cig, demonstrating that the spiral electrode has a higher capture efficiency than the needle-type electrode.

[0037] Table 1 Nicotine distribution results of spiral electrodes

[0038]

[0039] Table 2 Nicotine distribution results of needle-type electrodes

[0040]

[0041] In other embodiments, when setting the axial length of the external thread and the electrode seat, the axial length of the external thread can be set to 4.5 cm, 6.5 cm or 6 cm; in other embodiments, the axial length of the electrode seat can be set to 2.5 cm, 3.5 cm or 2.8 cm; in other embodiments, the axial length of the electrode seat can also be set to 4 cm or 7 cm; in other embodiments, the axial length of the external thread can also be set to 2 cm or 4 cm.

[0042] In other embodiments, when setting the fixing structure of the discharge electrode, the electrode holder may be provided integrally with the electrode body. In this case, when disassembling the discharge electrode, the electrode holder and the electrode body need to be removed simultaneously.

[0043] In other embodiments, when setting the shape of the external thread, the external thread may be set as a sawtooth thread.

[0044] In other embodiments, when the external thread structure is provided, the axial length of the external thread may be smaller than the axial length of the cylindrical discharge segment. In this case, the external thread may be provided as one segment or two segments spaced apart.

[0045] An embodiment of the electrostatic collector in the present invention: The electrostatic collector includes an electrode fixing tube and a discharge electrode fixed on the electrode fixing tube. The discharge electrode has the same structure as the discharge electrode for the electrostatic collector in any of the above embodiments and will not be described in detail.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A discharge electrode for an electrostatic collector, comprising an electrode body, one end of which is provided with a fixing structure for fixing to an electrode fixing tube of the electrostatic collector, the electrode body including a cylindrical discharge segment for discharging, characterized in that: The outer periphery of the cylindrical discharge segment is provided with an external thread, and the threads of the external thread form a continuous discharge tip.

2. The discharge electrode for an electrostatic collector according to claim 1, characterized in that: The axial length of the external thread is equal to the axial length of the cylindrical discharge segment.

3. The discharge electrode for an electrostatic collector according to claim 1 or 2, characterized in that: The external thread is a triangular thread.

4. The discharge electrode for an electrostatic collector according to claim 1 or 2, characterized in that: The discharge electrode for the electrostatic collector also includes an electrode seat detachably connected to the electrode body through a threaded structure. The electrode seat is used to be fixed on the electrode fixing tube of the electrostatic collector and constitute the fixing structure.

5. The discharge electrode for an electrostatic collector according to claim 4, characterized in that: The axial length of the external thread is 4.5~6.5cm, and the axial length of the electrode holder is 2.5~3.5cm.

6. An electrostatic collector comprising an electrode fixing tube and a discharge electrode fixed to the electrode fixing tube, the discharge electrode comprising an electrode body, one end of the electrode body being provided with a fixing structure for fixing to the electrode fixing tube, the electrode body comprising a cylindrical discharge segment for discharging, characterized in that: The outer periphery of the cylindrical discharge segment is provided with an external thread, and the threads of the external thread form a continuous discharge tip.

7. The electrostatic collector according to claim 6, characterized in that: The axial length of the external thread is equal to the axial length of the cylindrical discharge segment.

8. The electrostatic collector according to claim 6 or 7, characterized in that: The external thread is a triangular thread.

9. The electrostatic collector according to claim 6 or 7, characterized in that: The discharge electrode also includes an electrode seat detachably connected to the electrode body through a threaded structure. The electrode seat is used to be fixed on the electrode fixing tube of the electrostatic collector and constitute the fixing structure.

10. The electrostatic collector according to claim 9, characterized in that: The axial length of the external thread is 4.5~6.5cm, and the axial length of the electrode holder is 2.5~3.5cm.

Images