Cathode structure of ion generator

Abstract

According to the cathode structure of the ionizer, a large arc structure formed by winding one metal hot wire in the prior art is changed into a small arc structure formed by winding two metal hot wires, the pins are arranged at the two ends of each metal hot wire, and the metal hot wires are fixed to the sheet electrodes through the pins, so that the cathode structure of the ionizer is formed. According to the metal hot wire, the first end of the sheet-shaped electrode is provided with a pin positioning groove or an arc-shaped surface and a limiting step, so that the original multi-point welding between the linear pin and the sheet-shaped electrode is changed into straight welding, the angular tensile stress during welding is reduced, the metal hot wire is not prone to deformation in the assembling process, and the concentricity of the metal hot wire and other electrodes is kept; the stability of a small arc structure formed after welding is improved, a welding area of the metal hot wire and the sheet electrode is far away from a high-temperature area of the metal hot wire by arranging the linear pins, an effective electron emission area is enlarged, and heat loss generated by heat conduction is reduced. The efficiency of the metal heating wire is remarkably improved, the metal heating wire is not prone to fusing failure, and the service life is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of ion generator technology, and in particular relates to a cathode structure for an ion generator. Background Technology

[0002] Ion generators, as important electronic devices, are widely used in residual gas analysis, static electricity elimination, air purification, surface treatment, and other fields. The cathode structure, as one of the core components of an ion generator, plays a crucial role in its performance. Specifically, the cathode structure enables electrons on the surface of the cathode material to gain sufficient energy through heating or other methods, thereby overcoming the surface potential barrier and escaping to form an electron flow. These electrons collide with gas molecules under the influence of an electric field, ionizing the gas molecules and producing positive and negative ions.

[0003] Traditional ion generators typically use a metal wire as the emitter in their cathode structure. This wire emits electrons through heating or an electric field, thus generating ions. For example... Figure 1 As shown, the metal wire 01 is fixed to the bent electrode 02 by spot welding (resistance welding). However, in actual use, the following problems were found in the above structure: 1. The arc surface of the metal wire 01 is in contact with the plane of the electrode 02. If the metal wire 01 is welded to the plane of the electrode 02 at multiple points, the tensile stress in the welding angle will cause the arc-shaped metal wire 01 to deform and deviate from the center, causing the cathode structure to lose its roundness and making it impossible to maintain concentricity with other electrodes; 2. The electrode material is generally a good conductor of heat, which causes a cold end effect in the area near the welding of the metal wire and the electrode. That is, the temperature of the metal wire drops rapidly near the welding area, resulting in a reduction in the effective electron emission area. In this case, in order to obtain a larger emission current, it is necessary to increase the voltage and current of the metal wire, which will lead to a local temperature increase and make the metal wire prone to melting failure.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a cathode structure for an ion generator, which solves the problems of easy deformation of the cathode structure of the ion generator in the prior art, resulting in loss of roundness and inability to maintain concentricity with other electrodes, as well as easy melting failure due to the cold end effect.

[0006] To achieve the above object and other related objects, the present application provides a cathode structure of an ion generator, comprising:

[0007] a base, which is a cylindrical structure with a central through hole inside, and a plurality of assembly through holes are arranged on the end face of the base along the circumferential direction of the center of the base;

[0008] an inner gate, which is a circular ring, the diameter of the inner gate is equal to the diameter of the central through hole, and the inner gate is fixedly connected with the base;

[0009] a metal hot wire, which comprises a first metal hot wire and a second metal hot wire, and the first metal hot wire and the second metal hot wire are symmetrically distributed and each has a semicircular shape, the first metal hot wire and the second metal hot wire are arranged on the outer side of the inner gate to form a circular ring, the first end of the first metal hot wire is provided with a first pin, the second end of the first metal hot wire is provided with a second pin, the first end of the second metal hot wire is provided with a third pin, and the second end of the second metal hot wire is provided with a fourth pin;

[0010] a sheet electrode, which is arranged on the outer side of the metal hot wire in an L shape, the first end of the sheet electrode is fixedly connected with the metal hot wire, the second end of the sheet electrode is fixed in the assembly through hole by a bolt, and the second end of the sheet electrode and the base are further provided with the insulating gasket;

[0011] an outer gate, which is arranged on the sheet electrode in a circular ring shape, the outer gate is fixedly connected with the base through an outer gate electrode, and the outer gate electrode and the base are further provided with an insulating gasket.

[0012] Optionally, the base, the inner gate, the circular ring formed by the first metal hot wire and the second metal hot wire, and the outer gate have the same center.

[0013] Optionally, the lengths of the first pin, the second pin, the third pin and the fourth pin are equal, and each is 2-4 mm.

[0014] Optionally, the distance between the centers of the first pin and the third pin is 2-5 mm, and the distance between the centers of the second pin and the fourth pin is 0.5-4 mm.

[0015] Optionally, the cross-sectional diameter of the metal hot wire is 0.1-0.4 mm.

[0016] Optionally, the diameter of the circular ring formed by the first metal hot wire and the second metal hot wire is 9-10 mm.

[0017] Optionally, the first end of the sheet-shaped electrode is provided with an arc-shaped surface and a limiting step, the curvature radius of the arc-shaped surface is equal to the diameter of the circular ring formed by the first metal hot wire and the second metal hot wire, so as to realize the flat welding between the arc-shaped surface and the metal hot wire.

[0018] Optionally, the ratio of the height of the arc-shaped surface to the length of the first pin is 1 / 5-4 / 5.

[0019] Optionally, the first end of the sheet-shaped electrode is provided with a vertical pin positioning groove, and the diameter of the pin positioning groove is equal to the cross-sectional diameter of the metal hot wire.

[0020] Optionally, the distance between two adjacent pin positioning grooves is equal to the distance between the centers of the second pin and the fourth pin, and the distance between the pin positioning grooves on the two sides of the first end of the sheet-shaped electrode is equal to the distance between the centers of the first pin and the third pin.

[0021] As described above, the cathode structure of the ion generator of the present application has the following beneficial effects:

[0022] (1) The pin of the metal hot wire is arranged as a straight pin, so that the straight pin and the sheet-shaped electrode are changed from the original multi-point welding to flat welding, thereby reducing the angular tensile stress during welding, so that the metal hot wire is not easy to deform during assembly and maintains the concentricity with other electrodes;

[0023] (2) By arranging the straight pin, the welding area (cold end) of the metal hot wire and the sheet-shaped electrode is away from the high-temperature area of the metal hot wire, the effective electron emission area is increased, the heat loss due to heat conduction is reduced, the efficiency of the metal hot wire is significantly improved and the service life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A welding schematic diagram of a sheet-shaped electrode and a metal wire in the prior art is shown.

[0025] Figure 2 A three-dimensional schematic diagram of the cathode structure of the ion generator in the embodiment of the present application is shown.

[0026] Figure 3 A structural schematic diagram of the metal hot wire in the embodiment of the present application is shown.

[0027] Figure 4 A structural schematic diagram of a sheet-shaped electrode in the embodiment of the present application is shown.

[0028] Figure 5 A structural schematic diagram of another sheet-shaped electrode in the embodiment of the present application is shown.

[0029] Figure 6 Fig. 1 shows a schematic diagram of an assembly structure of a sheet electrode and a metal filament in an embodiment of the present application.

[0030] Element No. Explanation

[0031] 10, base; 11, inner gate; 12, first metal filament; 121, first pin; 122, second pin; 13, second metal filament; 131, third pin; 132, fourth pin; 14, sheet electrode; 141, arc surface; 142, limiting step; 143, pin positioning slot; 15, outer gate; 16, outer gate electrode; 17, insulating spacer. DETAILED DESCRIPTION

[0032] The present application is described in detail by specific working examples below, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of this specification. The present application can also be implemented or applied by other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0033] Please refer to Figures 2 to 5 It is noted that the diagrams provided in the present embodiment only schematically illustrate the basic concept of the present application, and thus the diagrams only show the components related to the present application rather than the components number, shape and size when actually implemented. The actual implementation of each component type, number and proportion can be arbitrarily changed, and the component layout type can also be more complex.

[0034] The present embodiment provides a cathode structure of an ion generator, please refer to Figure 2The cathode structure of the ion generator comprises a base 10 which is a cylindrical structure with a central through hole inside, a plurality of assembly through holes are arranged on the end face of the base 10 along the circumferential direction of the center of the base 10; an inner gate 11 which is a circular ring, the diameter of the inner gate 11 is equal to the diameter of the central through hole, and the inner gate 11 is fixedly connected with the base 10; a metal hot wire which comprises a first metal hot wire 12 and a second metal hot wire 13, and the first metal hot wire 12 and the second metal hot wire 13 are symmetrically distributed and each is in a semicircular shape, the first metal hot wire 12 and the second metal hot wire 13 are arranged on the outer side of the inner gate 11 in the form of a circular ring, a first pin 121 is arranged on the first end of the first metal hot wire 12, a second pin 122 is arranged on the second end of the first metal hot wire 12, a third pin 131 is arranged on the first end of the second metal hot wire 13, and a fourth pin 132 is arranged on the second end of the second metal hot wire 13; a sheet electrode 14 which is arranged on the outer side of the metal hot wire in the form of L, the first end of the sheet electrode 14 is fixedly connected with the metal hot wire, the second end of the sheet electrode 14 is fixed in the assembly through hole by a bolt, and the second end of the sheet electrode 14 and the base 10 are further provided with the insulating gasket 17; and an outer gate 15 which is arranged on the sheet electrode 14 in the form of a circular ring, the outer gate 15 is fixedly connected with the base 10 through an outer gate electrode 16, and the outer gate electrode 16 and the insulating base 10 are further provided with the insulating gasket 17.

[0035] As an example, the insulating gasket 17 is made of high-temperature-resistant insulating material, preferably ceramic, so as to improve the insulation effect between the sheet electrode 14 and the base 10 and between the outer gate 15 and the base 10. Specifically, in the embodiment, the material of the insulating gasket 17 is preferably A95 ceramic.

[0036] As an example, the base 10, the inner gate 11, the first metal hot wire 12 and the second metal hot wire 13, and the outer gate 15 have the same center.

[0037] Specifically, as shown in FIG. 1, the base 10 is a cylindrical structure with a central through hole inside, and a plurality of assembly through holes are arranged on the end face of the base 10 along the circumferential direction of the center of the base 10. Figure 2As shown, in this embodiment, a central through hole is provided in the central region of the base 10. From the central through hole, an inner gate 11, a ring formed by the first hot metal wire 12 and the second hot metal wire 13, and an outer gate 15 are sequentially distributed along the radial direction of the base 10. The base 10, the inner gate 11, the ring formed by the first hot metal wire 12 and the second hot metal wire 13, and the outer gate 15 have the same center, thereby making the ring formed by the first hot metal wire 12 and the second hot metal wire 13 have good roundness and coaxiality with other electrodes. This makes it less likely for the components of the cathode structure of the ion generator to deform during assembly, effectively improving the stability of the cathode structure of the ion generator.

[0038] As an example, the first pin 121, the second pin 122, the third pin 131 and the fourth pin 132 have the same length, and each is 2~4 mm.

[0039] Specifically, such as Figure 3 As shown, in this embodiment, the first metal heating wire 12 and the second metal heating wire 13 are symmetrically distributed and both are semi-circular in shape. The first metal heating wire 12 and the second metal heating wire 13 are arranged in a ring. The first end of the first metal heating wire 12 is provided with a first pin 121, the second end of the first metal heating wire 12 is provided with a second pin 122, the first end of the second metal heating wire 13 is provided with a third pin 131, and the second end of the second metal heating wire 13 is provided with a fourth pin 132. The lengths of the first pin 121, the second pin 122, the third pin 131, and the fourth pin 132 are all equal, so that the ring formed by the first metal heating wire 12 and the second metal heating wire 13 is on the same plane. The lengths of the first pin 121, the second pin 122, the third pin 131, and the fourth pin 132 are all 2~4 mm, for example, 2 mm, 3 mm, and 4 mm. As long as the lengths of the four pins are consistent, they are acceptable. Further details are omitted here.

[0040] As an example, the distance between the center of the first pin 121 and the center of the third pin 131 is 2~5 mm, and the distance between the center of the second pin 122 and the center of the fourth pin 132 is 0.5~4 mm.

[0041] Specifically, such as Figure 3As shown, in this embodiment, the diameter of the ring formed by the first hot metal wire 12 and the second hot metal wire 13 is 9~10 mm. The ring formed by the first hot metal wire 12 and the second hot metal wire 13 has a notch to adapt to the shape of the sheet electrode 14. The distance between the center of the first pin 121 and the center of the third pin 131 is 2~5 mm, for example, 2 mm, 3 mm, 4 mm or 5 mm. The distance between the center of the second pin 122 and the center of the fourth pin 132 is 0.5~4 mm, for example, 0.5 mm, 2 mm, 3.5 mm or 4 mm.

[0042] As an example, the cross-sectional diameter of the metal hot wire is 0.1~0.4 mm.

[0043] Specifically, to obtain a larger emission current, the interface diameter of the hot metal wire is set to 0.1~0.4 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, or 0.4 mm. This increases the maximum voltage and current that the hot metal wire can withstand, ensuring that it does not melt and fail while reaching its maximum temperature. Simulation results show that at 3.35 W / mm... 3 Under these conditions, the maximum temperature obtained using the metal hot wire in this embodiment is 1685°C, and the temperature distribution angle in the first metal hot wire 12 is 104.4°.

[0044] As an example, the first end of the sheet electrode 14 is provided with an arc-shaped surface 141 and a limiting step 142. The radius of curvature of the arc-shaped surface 141 is equal to the diameter of the ring formed by the first hot metal wire 12 and the second hot metal wire 13, so as to achieve a straight weld between the arc-shaped surface 141 and the hot metal wire. The ratio of the height of the arc-shaped surface 141 to the length of the first pin 121 is 1 / 5 to 4 / 5.

[0045] Specifically, such as Figure 4 As shown, this is a three-dimensional schematic diagram of a sheet electrode 14 in this embodiment. The first end of the sheet electrode 14 is provided with an arc-shaped surface 141 and a limiting step 142. The limiting step 142 can control the welding height of the hot metal wire, so that the welding height of the hot metal wire remains consistent. Welding on the arc-shaped surface 141 of the sheet electrode 14 can form a straight weld between the sheet electrode 14 and the hot metal wire, minimizing the angular tensile stress generated during welding and making the hot metal wire less prone to deformation during welding. The ratio of the height of the arc-shaped surface 141 to the length of the first pin 121 is 1 / 5 to 4 / 5, so that the height of the ring formed by the first hot metal wire 12 and the second hot metal wire 13 is slightly higher than that of the sheet electrode 14, increasing the structural stability of the hot metal wire.

[0046] As an example, the first end of the sheet electrode 14 is provided with vertical pin positioning grooves 143, the diameter of the pin positioning grooves 143 is equal to the cross-sectional diameter of the metal hot wire.

[0047] As an example, the distance between two adjacent pin positioning grooves 143 is equal to the distance between the centers of the second pin 122 and the fourth pin 132, and the distance between the pin positioning grooves 143 on both sides of the first end of the sheet electrode 14 is equal to the distance between the centers of the first pin 121 and the third pin 131.

[0048] Specifically, in another embodiment, as shown in the figure, pin positioning grooves 143 are provided at the first end of the sheet electrode 14, the pin positioning grooves 143 are distributed along the vertical direction of the sheet electrode 14, and the number of the pin positioning grooves 143 is four, the distance between two adjacent pin positioning grooves 143 is equal to the distance between the centers of the second pin 122 and the fourth pin 132, and the distance between the pin positioning grooves 143 on both sides of the first end of the sheet electrode 14 is equal to the distance between the centers of the first pin 121 and the third pin 131, as shown in the figure, so that the first pin 121, the second pin 122, the third pin 131 and the fourth pin 132 can be fixed in the pin positioning grooves 143 for welding, preferably, the diameter of the pin positioning grooves 143 is equal to the cross-sectional diameter of the metal hot wire, so that the first pin 121, the second pin 122, the third pin 131 and the fourth pin 132 have better stability after welding. Figure 5 Figure 6 As an example, the distance between two adjacent pin positioning grooves 143 is equal to the distance between the centers of the second pin 122 and the fourth pin 132, and the distance between the pin positioning grooves 143 on both sides of the first end of the sheet electrode 14 is equal to the distance between the centers of the first pin 121 and the third pin 131.

[0049] In summary, the cathode structure of the ion generator of the present application changes the large circular arc structure formed by one metal hot wire in the prior art into a small circular arc structure formed by two metal hot wires, and pins are provided at both ends of each metal hot wire, so that the fixing of the pins and the sheet electrode changes the original multi-point welding between the straight pins and the sheet electrode into flat welding, thereby reducing the angular tensile stress during welding, so that the metal hot wire is not easy to deform during assembly and maintains the concentricity with other electrodes, and the small circular arc structure after welding can be further improved in stability by providing pin positioning grooves or arc surfaces and limiting steps at the first end of the sheet electrode, and further by providing straight pins, the welding area (cold end) of the metal hot wire and the sheet electrode is away from the high temperature area of the metal hot wire, the effective electron emission area is increased, the heat loss due to heat conduction is reduced, the efficiency of the metal hot wire is significantly improved and the metal hot wire is not easy to melt and fail, and the service life is improved. Therefore, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.​

[0050] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any modification or change made by those skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A cathode structure of an ion generator, characterized by, The utility model relates to a kind of metal hot wire electrode, including: Base, the base is cylindrical structure with central through hole inside, the end surface of the base is provided with a plurality of assembly through holes along the circumferential direction of the center of the base; Inner gate, the inner gate is circular ring, the diameter of the inner gate is equal to the diameter of the central through hole, and the inner gate is fixedly connected with the base; Metal hot wire, the metal hot wire includes first metal hot wire and second metal hot wire, and the first metal hot wire and the second metal hot wire are symmetrically distributed and are semicircular, the first metal hot wire and the second metal hot wire are arranged on the outer side of the inner gate, the first end of the first metal hot wire is provided with first pin, the second end of the first metal hot wire is provided with second pin, the first end of the second metal hot wire is provided with third pin, and the second end of the second metal hot wire is provided with fourth pin; Sheet electrode, the sheet electrode is arranged on the outer side of the metal hot wire, the first end of the sheet electrode is fixedly connected with the metal hot wire, the second end of the sheet electrode is fixed in the assembly through hole by bolt, and the second end of the sheet electrode is further provided with insulating gasket between the base; Outer gate, the outer gate is circular ring and is arranged on the sheet electrode, and the outer gate is fixedly connected with the base through outer gate electrode, and the outer gate electrode is further provided with insulating gasket between the base.

2. The cathode structure of an ionizer according to claim 1, characterized in that: The base, the inner gate, the first metal hot wire and the second metal hot wire around the circular ring and the outer gate have the same center.

3. The cathode structure of an ionizer according to claim 1, characterized by: The length of the first pin, the second pin, the third pin and the fourth pin is equal, and is 2-4 mm.

4. The cathode structure of an ionizer according to claim 1, characterized by: The distance between the center of the first pin and the third pin is 2-5 mm, and the distance between the center of the second pin and the fourth pin is 0.5-4 mm.

5. The cathode structure of an ionizer of claim 1, wherein: The cross-sectional diameter of the metal hot wire is 0.1-0.4 mm.

6. The cathode structure of an ionizer of claim 1, wherein: The diameter of the circular ring around the first metal hot wire and the second metal hot wire is 9-10 mm.

7. The cathode structure of an ionizer of claim 1, wherein: The first end of the sheet electrode is provided with arc surface and limiting step, and the curvature radius of the arc surface is equal to the diameter of the circular ring around the first metal hot wire and the second metal hot wire.

8. The cathode structure of an ion generator according to claim 7, characterized in that: The ratio of the height of the arc surface to the length of the first pin is 1 / 5-4 / 5.

9. The cathode structure of an ionizer of claim 1, wherein: The first end of the sheet electrode is provided with vertical pin positioning groove, and the diameter of the pin positioning groove is equal to the cross-sectional diameter of the metal hot wire.

10. The cathode structure of an ion generator according to claim 9, characterized in that: The distance between adjacent two pin positioning grooves is equal to the distance between the center of the second pin and the fourth pin, and the distance between the pin positioning grooves on both sides of the first end of the sheet electrode is equal to the distance between the center of the first pin and the third pin.

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