Needle seat structure for reducing particle pollution of electrode needle of static eliminator

Abstract

A needle seat structure for reducing particle pollution of an electrode needle of a static eliminator belongs to the field of static elimination. Comprising an electrode needle, a cylindrical electrode needle mounting piece fixedly connected with the electrode needle is arranged on the electrode needle, and a cylindrical boss is arranged on the top of the cylindrical electrode needle mounting piece; an electric connection fixing piece with an inverted barrel-shaped structure is arranged; the electrode needle is located at the center of the shaft and penetrates through the whole electrode needle mounting piece, and the tail of the electrode needle is higher than a cylindrical boss at the top of the electrode needle mounting piece; the electrode needle mounting piece and the electric connection fixing piece are fixed together to form a cylindrical structure as a whole; an air channel component which is matched with the electrode needle mounting piece and is used for forming a circular-tube-shaped air channel is arranged; the air channel component is of an axial symmetry structure and is coaxially installed on the rod core of the ion rod with the electrode needle installation piece. By arranging a circular-tube-shaped air channel structure, the protection space of the electrode needle and the needle cone part of the electrode needle is enlarged, and the adsorption probability of pollution particles is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of active static eliminator, and particularly relates to an electrode needle holder for composing an ionization static eliminator. Background Technology

[0002] Gas-source ionization static eliminators, especially ion bars, have been widely used in the electronics industry, playing an important role in electrostatic protection during electronic manufacturing processes.

[0003] However, with the widespread use of electronic components that are more sensitive to static electricity, the requirements for electrostatic protection in electronic manufacturing processes are becoming increasingly stringent, which places higher demands on the static elimination performance of ion air bars.

[0004] One of the important external environmental factors affecting the electrostatic discharge performance of ion air bars is the adsorption of dust (particles) on the electrode, which has a significant negative impact on both the electrostatic discharge rate and ion balance. How to reduce the adsorption of dust (particles) on the electrode in the environment is one of the important research contents for maintaining the electrostatic discharge performance of ion air bars.

[0005] In the existing technology, ion air bars all adopt an electrode needle holder (assembly) structure to fix the electrode needles and compress the airflow output.

[0006] For example, a utility model patent with an authorization announcement date of October 30, 2020, and authorization announcement number CN 211831302 U, discloses "a discharge electrode assembly for an ion rod." The discharge electrode assembly includes a discharge electrode, an electrode sleeve, and an electrode base. The discharge electrode and electrode sleeve are fitted together, with the first end of the electrode sleeve connected to the electrode base and the last end connected to a circuit board in the ion rod. An air passage is provided in the electrode base. The longitudinal axis of the discharge electrode coincides with the longitudinal axis of the air passage. The air passage includes an inlet section, a mixing section, a contraction section, a throat, and an expansion section connected in sequence. The end of the expansion section constitutes the air passage outlet of the electrode base. The air passage outlet is a funnel-shaped opening structure. By optimizing the inlet structure, air passage structure, and outlet structure, it improves the output state of the ionized gas flow, making the output gas volume of each discharge electrode assembly of the ion rod uniform along its length. At the same vertical test distance, the airflow movement state in the horizontal direction on both sides of the ion rod is consistent, achieving a more balanced and faster electrostatic elimination effect and obtaining a larger electrostatic elimination range.

[0007] Specifically, the most important feature of the existing technology is that the electrode needle is set in the air passage located at the center of the electrode needle seat shaft, so as to realize the airflow to wrap (encapsulate) the electrode needle and reduce the effect of dust adsorption.

[0008] However, in practical applications, the existing technical solutions have been found to have the following technical defects:

[0009] 1) The existing "cylindrical" airway structure (hereinafter referred to as "cylindrical" airway) is located at the center of the electrode needle seat axis. Since the exhaust airflow is a jet, it will tightly adsorb the surrounding airflow onto the surface of the electrode needle (needle cone). The electric field intensity at the electrode needle (needle cone) is very high, which makes it very easy for charged dust (particles) in the surrounding air environment to be adsorbed onto the electrode needle (especially the needle cone part of the electrode needle). Over time, this will affect the stability and intensity of the discharge, thereby affecting the amount of ion generation and reducing the discharge performance.

[0010] 2) The existing "cylindrical" air passage structure is located at the center of the electrode needle seat axis. The outgoing airflow is a high-speed jet that tightly wraps around the electrode needle. This causes the positive and negative ions ionized at the electrode needle to be quickly transported to the surface of the object by the jet, which can easily cause large fluctuations in the balance of positive and negative ions, which is not conducive to the protection of static-sensitive items.

[0011] How to minimize the adsorption of charged dust (particles) onto the electrode needle, reduce the probability of adsorption of contaminant particles on the needle's conical part, reduce the impact of external pollutants on the performance of the needle's conical part, reduce fluctuations in the positive and negative ion balance voltage, and ultimately improve the electrostatic protection capability for electrostatic sensitive items is a technical problem that urgently needs to be solved in actual design and development work. Utility Model Content

[0012] The technical problem this invention aims to solve is to provide a needle holder structure that reduces particulate contamination of electrostatic discharger electrode needles. It modifies the existing air duct structure of electrode needle holders, adopting a "cylindrical" air duct structure that is non-contact with the electrode needle and indirectly surrounds it, with the entire electrode needle holder's axis as its centerline. This forms a "cylindrical" jet around the electrode needle (especially its cone portion), expanding the protective space for the electrode needle and its cone portion, reducing the probability of contaminant particle adsorption. Furthermore, by utilizing the eddy current generated at the electrode needle cone, it achieves the mixing of positive and negative ions, reducing fluctuations in the positive and negative ion balance voltage, ultimately improving the electrostatic protection capability for electrostatically sensitive items.

[0013] The technical solution of this utility model is: to provide a needle holder structure that reduces particulate contamination of the electrode needle in an electric shock extinguisher, including an electrode needle, characterized in that:

[0014] A cylindrical electrode needle mounting component is provided, which is fixedly connected to the electrode needle. A cylindrical boss is provided on the top of the cylindrical electrode needle mounting component.

[0015] Install an electrical connection fastener with an inverted cylindrical structure;

[0016] The electrode needle is located at the center of the shaft and penetrates the entire electrode needle mounting component, and the tail of the electrode needle protrudes above the cylindrical boss at the top of the electrode needle mounting component.

[0017] The electrode needle mounting component and the electrical connection fixing component are fixed together, forming an overall cylindrical structure;

[0018] Set up an airway component that matches the electrode needle mounting part and is used to form a "circular tube" airway;

[0019] The airway component is an axisymmetric structure and is mounted coaxially with the electrode needle mounting component on the core of the ion rod, forming a "circular tube" airway structure between the airway component and the electrode needle mounting component.

[0020] Specifically, the cylindrical boss has an external thread on its side; the inverted cylindrical electrical connection fastener has an internal thread on its inner side; the electrode pin mounting part and the electrical connection fastener are screwed together through a threaded connection part, forming a cylindrical structure.

[0021] Furthermore, an opening is provided at the top center of the electrical connection fastener.

[0022] Specifically, the electrical connection fixing component is fixedly installed with the high-voltage component inside the ion rod core through a spring pin; at the same time, the tail of the electrode needle is electrically connected to the high-voltage component inside the ion rod core through the spring pin.

[0023] Furthermore, the high-voltage component includes a high-voltage circuit board.

[0024] Specifically, the tail of the electrode needle protrudes above the cylindrical boss at the top of the mounting component and makes electrical contact with the spring pin, or the tail of the electrode needle is electrically connected to the high-voltage component inside the ion rod core via the spring pin.

[0025] Specifically, the gas jet formed by the "circular tube" airway creates a small vortex near the needle tip of the electrode needle. This vortex causes the positive and negative ions ionized at the tip of the electrode needle to rotate, which mixes and stirs the ions, making the spatial distribution of positive and negative ions more uniform and reducing fluctuations in the balance of positive and negative ions.

[0026] Specifically, the needle holder structure for reducing particulate contamination of the electrode needle in the extinguisher is provided with a "circular tube" airway structure that is not in contact with the electrode needle body and indirectly surrounds the entire electrode needle, with the center line of the entire electrode needle holder axis as the center line.

[0027] Furthermore, the "circular tube" airway structure generates a "circular tube" gas jet around the electrode needle and its cone portion, reducing the probability of adsorption of pollutant particles, expanding the protection space for the electrode needle and its cone portion, and improving the electrostatic protection capability for electrostatic sensitive items.

[0028] Furthermore, the "circular tube" gas channel structure generates a "circular tube" gas jet around the electrode needle and its cone portion. The electric field strength at the "circular tube" jet is less than the electric field strength at the electrode needle cone.

[0029] Compared with the prior art, the advantages of this utility model are:

[0030] 1. This technical solution changes the air passage structure of the electrode needle holder by adopting a "circular tube" air passage structure that is non-contact and indirectly surrounds the electrode needle, with the center line of the entire electrode needle holder as the center line. A "circular tube" jet is formed around the electrode needle cone (hereinafter referred to as "needle cone"). The "circular tube" jet will block the incoming airflow from the outside, causing charged dust (or charged particles, hereinafter referred to as "particles") to flow away quickly under the drag force of the jet, making it difficult for them to be adsorbed onto the electrode needle cone.

[0031] 2. The "circular tube" airway structure of this technical solution increases the protective space for the electrode needle. The electric field strength at the "circular tube" jet is much smaller than that at the electrode needle cone. The electric field force on the charged dust particles will be greatly reduced, making it less likely for them to be adsorbed onto the electrode needle cone.

[0032] 3. The jet formed by the "circular tube" air passage structure in this technical solution will create a vortex near the electrode needle cone, which will drive the positive and negative ions ionized at the tip of the electrode needle to rotate, thus playing a mixing and stirring role. In this way, the fluctuation of the balance of positive and negative ions is reduced, which is beneficial to the protection of static-sensitive items. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the "circular tube type" airway electrode needle holder of this utility model;

[0034] Figure 2 This is a cross-sectional view of the "circular tube" airway electrode needle holder of this utility model.

[0035] Figure 3 This is a bottom view of the "circular tube" airway electrode needle holder of this utility model.

[0036] Figure 4 This is an axonometric view of the "circular tube type" airway electrode needle holder of this utility model;

[0037] Figure 5 This is a flowchart of the simulation test of the "circular tube type" airway electrode needle holder of this utility model;

[0038] Figure 6 An axisymmetric structural diagram of the existing "cylindrical" airway electrode needle holder for simulation testing;

[0039] Figure 6-1 A diagram illustrating the axisymmetric computational domain for a simulation experiment of an existing "cylindrical" airway electrode needle holder;

[0040] Figure 7 This is an axisymmetric structural diagram of the "circular tube type" airway electrode needle holder for simulation testing of this utility model;

[0041] Figure 7-1 This is a diagram illustrating the axisymmetric computational domain of the simulation test of the "circular tube" airway electrode needle holder of this utility model;

[0042] Figure 8 Simulation diagram of the flow field characteristics formed by the existing "cylindrical" airway electrode needle holder;

[0043] Figure 9 This is a simulation diagram of the flow field characteristics formed by the "circular tube type" airway electrode needle seat of this utility model;

[0044] Figure 10 Simulation diagram of the electric field characteristics formed by the existing "cylindrical" airway electrode needle holder;

[0045] Figure 11 This is a simulation diagram of the electric field characteristics formed by the "circular tube type" airway electrode needle seat of this utility model;

[0046] Figure 12-1 Simulation diagram of particle adsorption characteristics formed by existing "cylindrical" airway electrode needles under the condition of releasing particles in the flow region c';

[0047] Figure 12-2 Simulation diagram of particle adsorption characteristics formed by existing "cylindrical" electrode needles under the condition of releasing particles at open boundary d';

[0048] Figure 13-1 Simulation diagram of the microparticle adsorption characteristics formed by the "circular tube" gas channel electrode needle seat of this utility model (microparticles are released in the flow region c);

[0049] Figure 13-2 Simulation diagram of the microparticle adsorption characteristics formed by the "circular tube" airway electrode needle seat of this utility model (microparticles are released at the open boundary d);

[0050] Figure 14-1 This is a comparative data chart showing the adsorption probability of particulate pollutants by electrode needles and cones under the condition of releasing particulates in the flow region.

[0051] Figure 14-2 This is a comparative data chart showing the adsorption probability of particulate pollutants by electrode needles under open boundary conditions.

[0052] In the figure, 1 is the electrode needle, 2-1 is the electrode needle mounting part, 2-1-1 is the cylindrical boss, 2-2 is the electrical connection fixing part, 2-2-1 is the opening, 3 is the air passage component, 4 is the "circular tube" air passage, 5 is the threaded connection part, a is the two-dimensional axisymmetric structure of the simulation test electrode needle, b is the two-dimensional axisymmetric structure of the "circular tube" air passage simulation test electrode needle seat, b' is the two-dimensional axisymmetric structure of the existing "cylindrical" air passage simulation test electrode needle seat, c is the flow region of the "circular tube" air passage simulation test, c' is the flow region of the existing "cylindrical" air passage simulation test, d is the open flow boundary of the "circular tube" air passage simulation test, d' is the open flow boundary of the existing "cylindrical" air passage simulation test, and e is the vortex. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0054] The design concept of this utility model is:

[0055] The existing air duct structure of the electrode needle holder is changed to a "circular tube" structure that is non-contact and indirectly surrounds the electrode needle, with the center line of the entire electrode needle holder as the center line. A "circular tube" jet is formed around the electrode needle (especially its needle cone part) to expand the protection space for the electrode needle and its needle cone part. The "circular tube" jet reduces the probability of adsorption of contaminant particles, and ultimately improves the electrostatic protection capability for electrostatic sensitive items.

[0056] Specifically, the implementation path of this utility model's technical solution is as follows:

[0057] like Figures 1 to 4 As shown in the figure, in this technical solution, a cylindrical electrode needle mounting component 2-1 is provided and fixedly connected to the electrode needle 1. The side of the cylindrical boss 2-1-1 at the top of the mounting component is provided with mounting threads. The electrode needle is located at the center of the shaft and passes through the entire electrode needle mounting component, and the tail of the electrode needle is higher than the cylindrical boss 2-1-1 at the top of the mounting component.

[0058] An electrical connection fastener 2-2 is provided, which is an inverted cylindrical plastic part with an opening 2-2-1 at the center of the top. The inner side of the cylindrical wall is provided with mounting threads that match the electrode needle mounting part.

[0059] The electrode needle mounting part 2-1 and the electrical connection fixing part 2-2 are screwed together and fixed together by the threaded connection part 5, forming a cylindrical structure.

[0060] The electrical connection fastener can be installed and fixed to the high-voltage components (such as high-voltage circuit boards) inside the rod core by a custom-made spring pin; at the same time, the tail of the electrode needle can also be electrically connected to the high-voltage components inside the rod core by the aforementioned spring pin.

[0061] A separate structural component (referred to as airway component 3) is provided to form an airway in conjunction with the electrode needle mounting component. This structural component has an axisymmetric structure and is mounted on the core of the ion rod coaxially with the electrode needle mounting component.

[0062] Thus, a "circular tube" airway 4 (also known as a "circular tube" airway structure) is formed between the aforementioned airway components and the electrode needle mounting components.

[0063] See Figure 5 As shown, to verify the rationality and superiority of the "circular tube" airway electrode needle holder structure of this utility model, a comparative simulation experiment was conducted between the existing "cylindrical" electrode needle holder structure and the "circular tube" airway electrode needle holder structure of this utility model:

[0064] 1) Construct simulation test structural models of the existing "cylindrical" electrode needle holder and the "circular tube" airway electrode needle holder of this utility model respectively, and apply the Realizable k-ε turbulence mathematical model to the airway formed by the electrode needle holder and the set flow space, and apply the electrostatic field mathematical model to the electrode needle holder and the set flow space (i.e. the entire simulation domain).

[0065] 2) Mesh the entire simulation domain and perform simulation calculations to obtain the flow field and electric field distribution of the air passage and the set flow space.

[0066] 3) Apply mathematical models of the motion of charged particles in the electric field and flow field to the air passage and the set flow space. The velocity field and electric field distribution used for the domain conditions and boundary conditions of the motion of charged particles are based on the data obtained from the simulation of the flow field and electric field of the air passage and the set flow space. Perform simulation calculations to obtain the simulation results of the motion characteristics of charged particles.

[0067] 4) Analyze and compare the flow field characteristics, particle motion characteristics, and particle adsorption probability of the electrode needle (needle cone) presented by different electrode needle holder structures. By analyzing the flow field characteristics near the electrode needle and the particle adsorption probability of the electrode needle (needle cone), the superiority of the "circular tube" airway electrode needle holder structure of this utility model can be determined.

[0068] The technical solution of this utility model will be further described below:

[0069] 1. See Figures 1 to 4 As shown, a cylindrical plastic mounting part 2-1 is provided, which is fixed together with the electrode needle 1 to form a whole; the cylindrical boss 2-1-1 at the top of the mounting part 2-1 has a mounting thread on its side; wherein, the electrode needle 1 passes through the entire mounting part 2-1 at the center of the shaft, and the tail of the electrode needle protrudes above the cylindrical boss at the top of the mounting part, so as to achieve electrical contact (elastic contact) with the customized spring pin.

[0070] 2. An electrical connection fastener 2-2 is provided, which is an inverted cylindrical plastic part with an opening 2-2-1 at the center of the top. The inner side of the cylindrical wall has mounting threads that match the electrode needle mounting part 2-1, allowing for assembly and connection / fixation of the two. The outer diameter of the electrical connection fastener 2-2 is the same as the maximum outer diameter of the cylindrical plastic mounting part 2-1. After assembly, the whole assembly forms a cylindrical structure.

[0071] 3. The electrical connection fixing component 2-2 can be installed and fixed to the high-voltage components (such as high-voltage circuit boards) inside the rod core through a customized spring pin (not shown in the figure). At the same time, the spring pin can also be used to make an electrical connection between the tail of the electrode needle and the high-voltage components inside the rod core.

[0072] 4. A gas passage component 3 is provided. This component is axially symmetrical and is mounted on the core of the ion rod coaxially with the electrode needle mounting component 2-1. Thus, a "circular tube" gas passage structure 4 is formed between the gas passage component 3 and the electrode needle mounting component 2-1.

[0073] Example:

[0074] To verify the rationality of the "circular tube" airway electrode needle holder structure of this utility model, a simulation comparison experiment was conducted between the existing "cylindrical" electrode needle holder structure and the "circular tube" airway electrode needle holder structure of this utility model. Figure 5 As shown, the methodology and results analysis of the comparative experiment are as follows:

[0075] 1) See Figure 6 , Figure 7 The figures shown are two-dimensional axisymmetric structural diagrams of the existing "cylindrical" electrode needle holder structure and the "circular tube" airway electrode needle holder of this utility model, respectively, for simulation experiments. The electrode needle holder structure has been reasonably simplified for the convenience of simulation.

[0076] 2) See Figure 6-1 , Figure 7-1 As shown, for both the existing "cylindrical" electrode needle holder structure and the "circular tube" airway electrode needle holder of this utility model, the Realizable k-ε turbulence mathematical model is applied to the airway formed by the electrode needle holder and the set flow spaces c' and c:

[0077] The jet field formed by the electrode needle holder after compressed air is input is described using a Realizable k-ε turbulence model:

[0078] —Momentum continuity equation

[0079] —Mass continuity equation

[0080] ——Viscous force tensor

[0081] — Turbulent kinetic energy equation

[0082] — Turbulent kinetic energy generation term

[0083] ——Turbulent viscosity

[0084]

[0085] — Turbulent dissipation equation

[0086]

[0087] Among them, S ij Ω is the average strain tensor. ij C is the rotational rate tensor; ε2 =1.9, A0=4, σ k =1,σ ε =1.2 are all model coefficients; ρ is the fluid density (kg / m³). 3 ), where is the air density under standard conditions; u is the fluid velocity (m / s).

[0088] 3. Apply an electrostatic field mathematical model to the electrode needle holder, electrode needle, and the defined flow space (i.e., the entire simulation domain):

[0089]

[0090] D=ε0ε r E

[0091]

[0092] Where E is the electric field strength (V / m), V is the voltage applied by the electrode needle (V), and D is the electric displacement (C / m). 2 ), ε0=8.854187817×10 -12 F / m is the vacuum permittivity, ε r is the relative permittivity of the material.

[0093] 4) Mesh the entire simulation domain and perform simulation calculations to obtain the flow field and electric field distribution of the air duct and the defined flow space, see [link to simulation]. Figures 8 to 11 As shown.

[0094] 5) Apply mathematical models of electric field and flow field motion of charged particles to the air passage and the defined flow space:

[0095] When particulate pollutants in the environment are carried into the working area of ​​the ionizer by the jet of the ionizer, they are charged by positive and negative ions, acquiring a static charge and becoming charged particles. They are mainly affected by two forces, one of which is the electric field force:

[0096] F e =eZE

[0097] Where: e = 1.602176634 × 10 -19 C is the elementary charge; Z is the charge number; E is the electric field strength, V / m.

[0098] One is the flow field drag. In this technical solution, a standard drag correlation model is used to simulate the drag force experienced by particles in the flow field.

[0099]

[0100] C D =f(Re r )

[0101]

[0102] Where: τ p ρ is the particle velocity response time, in seconds; d The density of the particles is kg / m³. 3 ;d p ρ is the particle diameter, m; μ is the hydrodynamic viscosity, Pa·s; C D The drag coefficient is a function of the relative Reynolds number of particles in the flow field. Its expression is determined in real-time, dynamically, and piecewise based on the gas density, viscosity, and velocity in the gas-solid two-phase fluid field, as well as the particle diameter and velocity. r ρ is the relative Reynolds number of the particles in the flow field; ρ is the fluid mass density, kg / m³. 3 u is the fluid velocity at the particle's location, m / s; v is the particle velocity, m / s; S is the drag correction factor; Kn is the Knudsen number; C1, C2, and C3 are empirical coefficients; λ is the mean free path of molecules in the surrounding fluid, m; p is the gas pressure, Pa.

[0103] To more clearly and quickly demonstrate the effects of different technical solutions, and to simplify simulation calculations, a saturated charge model was directly adopted for all particle charges.

[0104]

[0105] Among them: Z s ε is the saturated charge number of the particle. rp The dielectric constant of the particles is ε0 = 8.854187817 × 10⁻⁶. -12 F / m is the vacuum permittivity.

[0106] In summary, the force equations for charged particles in the fluid field of the ion wind bar are as follows:

[0107]

[0108] Where: m p Let be the particle mass, kg; q be the particle's spatial position vector.

[0109] 6) The velocity field and electric field distribution used in the domain and boundary condition settings for the charged particle motion simulation are based on the data obtained from the flow field and electric field simulations of the aforementioned air duct and the defined flow space. Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown.

[0110] 7) Set boundary conditions such as particle mass density, diameter, relative permittivity, particle release location, quantity, and distribution:

[0111] For example, setting the particle mass density ρ d =2329[kg / m 3 The particle diameter can be set to 3 μm, a common and easily charged particle in the atmospheric environment (for simplicity, the particle is assumed to be spherical); the relative permittivity ε of the particle. rp =11.7;

[0112] Two particle release characteristics were set and simulated respectively:

[0113] A) Particles are randomly released from flow regions c' and c, and the number of charged particles is set to 10,000.

[0114] B) Particles are randomly released from open boundaries d' and d', with the number of charged particles set to 10,000.

[0115] 8) Perform simulation calculations to obtain simulation results of the charged particle motion characteristics / adsorption states, see [link to simulation]. Figure 12-1 , 12-2 As shown in 13-1 and 13-2.

[0116] 9) Comparison Figure 8 and Figure 9 and combined Figure 10 , Figure 11 and Figure 14-1 , 14-2 Analysis reveals that:

[0117] a. In existing cylindrical electrode needle holders, the airflow emitted from the center of the shaft causes the surrounding airflow to adhere tightly to the electrode needle (needle cone); and the electric field strength at the electrode needle (needle cone) is extremely high (see...). Figure 10, 11 This makes it extremely easy for charged dust particles (particulate matter) in the surrounding air to adhere to the electrode needles (from...). Figure 14-1 , 14-2 As can be seen, the adsorption probability of particulate contaminants on the electrode needle cone of the existing "cylindrical" electrode needle holder structure is much higher than that of the "circular tube" gas channel electrode needle holder structure of this technical solution. Over time, this affects the stability and intensity of the discharge, thereby affecting the amount of ions generated and reducing the static electricity dissipation performance. Furthermore, the high-speed jet tightly wrapping the electrode needle also causes the positive and negative ions ionized at the electrode needle to be rapidly transported to the surface of the object, which can easily cause large fluctuations in the balance of positive and negative ions, which is not conducive to the protection of static-sensitive items.

[0118] b. Comparison Figure 8 and Figure 9 The airflow motion pattern formed by the "circular tube" airway electrode needle holder of this utility model increases the protective space for the electrode needle and blocks the incoming airflow from the outside of the jet, causing charged dust (particles) to flow away quickly under the drag force of the jet, making it less likely to adhere to the electrode needle (needle cone). Furthermore, the electric field strength at the outlet airflow is much lower than that at the electrode needle (needle cone), significantly reducing the electric force on the charged dust (particles) and making it less likely to adhere to the electrode needle (needle cone).

[0119] c. See Figure 9 As shown, the jet generated by the "circular tube" airway electrode needle holder of this utility model will form a small vortex near the electrode needle cone (represented by the letter e in the figure). This vortex will drive the positive and negative ions ionized at the tip of the electrode needle to rotate, which objectively plays a mixing and stirring role, making the spatial distribution of positive and negative ions more uniform, and then transporting them to the surface of the object. This can reduce the fluctuation of the balance of positive and negative ions, which is beneficial to the protection of static-sensitive items.

[0120] In summary, the technical essence of this solution is to improve the protection performance of the electrode needle (needle cone) against external contaminants by changing the air passage structure of the electrode needle holder. The existing cylindrical air passage structure, located at the center line of the electrode needle holder axis and in direct contact with the electrode needle, is transformed into a tubular air passage structure that is non-contact with the electrode needle and indirectly surrounds it, with the entire center line of the electrode needle holder axis as its center line. This not only expands the protective space for the electrode needle (needle cone) and reduces the probability of contaminant particle adsorption, but also utilizes the eddy current generated at the electrode needle cone to achieve the mixing of positive and negative ions, reducing fluctuations in the positive and negative ion balance voltage, ultimately improving the electrostatic protection capability for electrostatically sensitive items.

[0121] This invention can be widely used in the design and manufacture of gas-source ionization electrostatic elimination devices.

Claims

1. A needle seat structure for reducing particle contamination of an electrode needle of an ionizer, comprising an electrode needle, characterized in that: a cylindrical electrode needle mounting member is provided and fixedly connected with the electrode needle, and a cylindrical boss is provided on the top of the cylindrical electrode needle mounting member; an electric connection fixing member is provided and has an inverted cylindrical structure; the electrode needle is arranged to pass through the entire electrode needle mounting member at the center of the shaft, and the tail of the electrode needle is higher than the cylindrical boss on the top of the electrode needle mounting member; the electrode needle mounting member and the electric connection fixing member are fixed together and have a cylindrical structure as a whole; an air channel member is provided and matched with the electrode needle mounting member to form a "cylindrical tube" air channel structure; and the air channel member has an axial symmetry structure and is coaxially arranged on the rod core of the ionizer, and a "cylindrical tube" air channel structure is formed between the air channel member and the electrode needle mounting member.

2. The needle seat structure for reducing particle contamination of an electrode needle of an ionizer according to claim 1, characterized in that: external threads are provided on the side surface of the cylindrical boss; internal threads are provided on the inner side of the cylindrical wall of the inverted cylindrical electric connection fixing member; the electrode needle mounting member and the electric connection fixing member are rotatably fixed together through the threaded connection part, and have a cylindrical structure as a whole; an opening is provided at the center of the top of the electric connection fixing member; the electric connection fixing member is fixedly arranged with a high-voltage component in the ionizer rod core through a spring ejector pin, and the tail of the electrode needle is electrically connected with the high-voltage component in the ionizer rod core through the spring ejector pin; the high-voltage component comprises a high-voltage circuit board; the tail of the electrode needle is electrically connected with the spring ejector pin, or the tail of the electrode needle is electrically connected with the high-voltage component in the ionizer rod core through the spring ejector pin; the "cylindrical tube" air channel forms a small area of vortex flow near the needle cone of the electrode needle, the vortex flow drives the positive and negative ions ionized at the tip of the electrode needle to rotate, and the mixing and stirring effect is achieved, so that the spatial distribution of the positive and negative ions becomes more uniform, and the fluctuation of the positive and negative ion balance is reduced; the needle seat structure for reducing particle contamination of an electrode needle of an ionizer is provided with a "cylindrical tube" air channel structure which is coaxial with the electrode needle body and indirectly surrounds the entire electrode needle; the "cylindrical tube" air channel structure generates a "cylindrical tube" gas jet around the electrode needle and the needle cone part, reduces the adsorption probability of the contaminated particles, expands the protection space of the electrode needle and the needle cone part, and improves the electrostatic protection capability of the electrostatic sensitive articles; the electric field intensity of the "cylindrical tube" gas jet is smaller than the electric field intensity of the needle cone of the electrode needle. ​ ​ ​ ​ ​ ​ ​ ​ 3. The needle hub structure of claim 1, wherein ​ 4. The needle hub structure of claim 1, wherein ​ 5. The needle hub structure of claim 4 wherein ​ 6. The needle hub structure of claim 4 wherein ​ 7. The needle hub structure of claim 1 wherein the needle hub structure is configured to reduce the amount of particulate contamination on the electrodes of the electrosurgical generator. ​ 8. The needle hub structure of claim 1 wherein the needle hub structure is configured to reduce the amount of particulate contamination on the electrodes of the electrosurgical generator. ​ 9. The needle hub structure of claim 8, wherein ​ 10. The needle hub structure of claim 8 wherein the needle hub structure is configured to reduce the amount of particulate contamination on the electrodes of the electrosurgical generator. ​

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