A high-frequency high-power switch

Abstract

The present invention relates to the field of switches, and provides a high-frequency high-power switch, which includes a static contact, a moving contact, a support seat and a lifting device. The static contact and the lifting device are both fixed on the support seat; the number of the static contacts is more than two, and these static contacts are arranged up and down; for each of the static contacts, it respectively includes a wiring board and two reed assemblies, and the two reed assemblies clamp the wiring board and are fixedly connected together; for each of the reed assemblies, it respectively includes a reed and two pressure rings, and the reed includes a support ring and a plurality of contact fingers circumferentially arranged on the support ring; the two pressure rings clamp the support ring and are fixedly connected together; the lifting device is connected to the moving contact to drive the up and down movement of the moving contact, so that the moving contact contacts and separates from all the contact fingers. This high-frequency high-power switch has a simple structure and low cost, and is applicable to different high-voltage occasions.

Description

Technical Field

[0001] The present invention belongs to the field of switches, and more specifically, relates to a high-frequency high-power switch. Background Art

[0002] High-frequency high-power switches are applied in high-voltage and high-frequency occasions such as transmitters. Their main functions in a transmitter include switching frequency bands, short-circuiting coils, and changing working states, etc. High-frequency high-power switches mainly consist of moving contacts and static contacts. The moving contacts and static contacts determine parameters such as withstand voltage, current density, and contact resistance, and are key components of high-frequency high-power switches.

[0003] The reed fingers in the static contacts contact the moving contacts, and each contact point acts as a "bridge" to evenly conduct current. Existing finger structures include plum blossom fingers, Z-shaped fingers, watchband fingers, and spring fingers. Among them, plum blossom fingers are extrusion or stamping parts with many assembled components and complex assembly; Z-shaped fingers are extrusion-molded parts with a large bending angle and difficult manufacturing; watchband fingers have advantages such as no need for a pressing spring, simple structure, many contact points, and strong conductivity compared to plum blossom fingers, but they have strict requirements for the material heat treatment process, high processing accuracy requirements, and relatively high costs; spring fingers are a new type of finger structure. Spring fingers allow for relatively large tolerances and errors in the contact surface design, and have a constant contact stress, small wear, and a long service life. They are widely used in sliding point contacts and static-dynamic contact devices in high-voltage and extra-high-voltage circuit breakers. China started late in the research on spring fingers. Currently, the main problem in research is that under the condition of the same external dimension, the long-term current-carrying capacity still needs to be improved. The Joule heat generated by the contact resistance of the fingers is too large, causing the contact point material to soften or even weld. Moreover, the excessive temperature rise will cause the elasticity of the fingers to decrease, resulting in poor contact and affecting the reliability of electrical contact. At the same time, high temperature reduces the insulation performance of the material, and may even cause electrical breakdown or short circuit. Summary of the Invention

[0004] In view of the above problems, the present invention provides a high-frequency high-power switch. This high-frequency high-power switch has good electrical performance, and the fingers have good elasticity and electrical properties, avoiding heating problems caused by large resistance or poor contact, etc., so as to meet the electrical requirements in actual use.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a high-frequency high-power switch, which includes a static contact, a moving contact, a support seat, and a lifting device, and is characterized in that:

[0006] The static contact and the lifting device are both fixed on the support seat; the number of static contacts is two or more, and these static contacts are arranged vertically.

[0007] For each of the stationary contacts, each of them includes a wiring board and two reed components. The two reed components clamp the wiring board and they are fixedly connected together;

[0008] For each of the reed components, each of them includes a reed and two pressure rings. The reed includes a support ring and a plurality of contact fingers circumferentially arranged on the support ring; the two pressure rings clamp the support ring and they are fixedly connected together;

[0009] The lifting device is connected to the moving contact to drive the up-and-down movement of the moving contact, so that the moving contact contacts and separates from all the contact fingers.

[0010] Preferably, the support base includes a support frame, multiple layers of support rod groups and multiple layers of support plates. The multiple layers of support rod groups are arranged in layers up and down. Each layer of support rod group has multiple vertically arranged support rods. These support plates are also arranged up and down and are connected by the support rods. Each support plate is horizontally arranged. The lowermost support plate is installed on the support frame through the support rod group. The lifting device is installed on the support frame. Each stationary contact is respectively installed on one of the support plates.

[0011] Preferably, the contact finger is a stamping-formed S-shaped elastic sheet.

[0012] Preferably, the moving contact is connected to the lifting device through a support column to support the moving contact.

[0013] Preferably, the stationary contact further includes a guide ring for guiding the moving contact during the up-and-down movement.

[0014] Preferably, the contact finger is subjected to hot processing to make the elasticity of the contact finger reach the set requirements.

[0015] Preferably, the material of the contact finger is beryllium bronze with a silver plating on its surface.

[0016] Preferably, the contact finger includes an arc section, a straight section, a contact section and a tail section and they are connected in sequence. The contact section is the part where the stationary contact contacts the moving contact. The arc section of the contact finger is connected to the support ring.

[0017] Preferably, the angle formed by the straight section and the support ring is θ, and its range is 45° ≤ θ < 90°.

[0018] Preferably, the moving contact includes an upper end cover, a metal tube and a lower end cover and they are fixedly connected in sequence from top to bottom. The material of the metal tube is red copper.

[0019] Generally speaking, compared with the prior art by the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0020] (1) For the high-frequency high-power switch of the present invention, the static contact and the lifting device are fixed on the support base. The static contacts are connected by support rods, and the lifting device is connected to the moving contact through a support pillar. The up and down movement of the lifting device drives the moving contact to move, thereby realizing the on-off of the switch. The structures of the support columns and the support pillars make the structure of the entire high-frequency high-power switch simple. The static contact includes S-shaped contact fingers, which have a simple structure, small volume, and low cost, and are conducive to mass production.

[0021] (2) For the high-frequency high-power switch of the present invention, the contact fingers are heat-treated to make the elasticity of the contact fingers meet the set requirements, ensuring good contact between the static contact and the moving contact.

[0022] (3) For the high-frequency high-power switch of the present invention, the contact fingers are made of beryllium bronze with good elastic properties, and the surfaces of the contact fingers are silver-plated. The good elastic properties of the contact fingers can ensure good contact between the static contact and the moving contact, avoiding the problem of heat generation. The silver-plating treatment on the surface enhances the conductivity of the contact fingers, further avoiding the problem of the decline in elastic properties caused by the heat generation problem.

[0023] (4) For the high-frequency high-power switch of the present invention, the contact finger includes an arc section, a straight section, a contact section, and a tail section, and they are connected in sequence. The arc section of the contact finger is fixed on the support ring. Through the connection between the arc section and the support ring, it is ensured that the bottom of the contact finger has a certain bending angle, avoiding breakage due to excessive external force and improving the service life of the contact finger.

[0024] (5) For the high-frequency high-power switch of the present invention, the moving contact includes an upper end cover, a metal tube, and a lower end cover, and the metal tube is made of metal copper, which has a simple structure, is easy to manufacture, and has good conductivity.

[0025] (6) The present invention relates to a reed with an S-shaped contact finger, which has a simple structure, small volume, and low cost, and is suitable for mass production. Based on the reed with an S-shaped contact finger, a high-frequency high-power switch is designed. Through continuous research, design, testing, and improvement, the high-frequency high-power switch meets the electrical requirements. The S-shaped contact finger has a significant improvement in the structure of the product and is an innovative structural form, producing good and practical effects. Description of the Drawings

[0026] Figure 1 is the axonometric view of the high-frequency high-power switch of the present invention;

[0027] Figure 2 is the front view of the high-frequency high-power switch of the present invention;

[0028] Figure 3 is the partial cross-sectional view of the high-frequency high-power switch of the present invention;

[0029] Figure 4 is Figure 1Top view of the static contact shown;

[0030] Figure 5 is Figure 1 Cross-sectional view of the static contact shown;

[0031] Figure 6 is Figure 5 Axonometric view of the reed shown;

[0032] Figure 7 is Figure 5 Top view of the reed shown;

[0033] Figure 8 is Figure 5 Side view of the reed shown;

[0034] Figure 9 is Figure 5 Cross-sectional view of the reed shown;

[0035] Figure 10 is Figure 9 Partially enlarged view of the S-shaped contact finger of the reed shown;

[0036] Figure 11 Cross-sectional view of the moving contact of the invention;

[0037] Figure 12 Front view of the lifting device of the invention. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Refer to Figures 1 to 12 , a high-frequency high-power switch, which includes a static contact 11, a moving contact 12, a support seat and a lifting device 15. The static contact 11 and the lifting device 15 are both fixed on the support seat; the support seat includes a support frame 16, multiple groups of support rods 14 and multiple layers of support plates 45. The multiple groups of support rods 14 are arranged in layers up and down. Each group of support rods 14 has multiple vertically arranged support rods 14. These support plates 45 are also arranged up and down and are connected by the support rods 14. Each support plate 45 is horizontally arranged. The lowermost support plate 45 is installed on the support frame 16 through a group of support rods 14. The lifting device 15 is installed on the support frame 16. Each static contact 11 is respectively installed on one of the support plates 45.

[0040] Both the support frame 16 and the support rod 14 are made of high-strength high-frequency insulating materials such as polyethylene and epoxy resin. Both ends of the support frame 16 and the support rod 14 are flange structures for fixed connection. The structure of the support plate 45 is square outside and round inside, and through holes are designed in the inner circumference for the installation of the static contact 11. At the same time, flange mounting holes are designed at the four top corners of the support plate 45 for the fixation of the support rod 14. Such a hierarchical structure and the use of materials make the connection between components more stable and facilitate maintenance and disassembly.

[0041] The number of the static contacts 11 is more than two, and these static contacts 11 are arranged vertically. For each of the static contacts 11, each includes a wiring board 44 and two reed components 49. The two reed components 49 clamp the wiring board 44 and they are fixedly connected together. For each of the reed components 49, each includes a reed 43 and two pressure rings. The reed 43 includes a support ring 52 and a plurality of contact fingers 51 circumferentially arranged on the support ring 52. The two pressure rings clamp the support ring 52. Each static contact 11 further includes a guide ring 48. The guide ring 48 is on the outside of the pressure ring and they are fixedly connected together. To prevent tip discharge, it is fixed with copper hexagon socket head cap screws and hexagon socket head cap nuts.

[0042] Among them, the wiring board 44 has a square outside and round inside structure for conducting electricity, but it can also be connected unilaterally. The form of the wiring board 44 is relatively diverse, and the material is purple copper with a silver plating treatment on the surface. Threaded through holes are processed on the wiring board 44 for fixing the wiring terminals. The material of the reed 43 is beryllium bronze with good elasticity and a silver plating on the surface to enhance the conductivity. The contact finger 51 is a stamping-formed S-shaped elastic piece. To ensure that the contact finger 51 has elasticity, heat treatment is carried out after stamping. When installed, the contact fingers 51 of the reed 43 face upward. The guide ring 48 is used for guiding during the up and down movement of the moving contact 12 and is made of high-strength high-frequency insulating materials such as polyethylene and epoxy resin, with through holes designed circumferentially. The first pressure ring 41 is a ring-shaped structure for conducting electricity, made of purple copper with a tin plating treatment on the surface, and screw blind holes are designed circumferentially on the ring. The second pressure ring 42 is a ring-shaped structure for conducting electricity, made of purple copper with a tin plating treatment on the surface, and counterbores are designed circumferentially on the ring for fitting and fixing with the first pressure ring 41.

[0043] Further, the contact finger 51 includes an arc segment 74, a straight segment 73, a contact segment 72, and a tail segment 71, and they are connected in sequence. The contact segment 72 is the part where the static contact 11 contacts the moving contact 12. The arc segment 74 of the contact finger 51 is connected to the support ring 52. Among them, the angle formed by the straight segment 73 and the support ring 52 is θ, and its range is 45 ° ≤θ<90 ° 。

[0044] The wiring board 44, compression ring, etc. are made of red copper. Further, by providing an arc section 74 on the contact finger 51, the contact pressure between the contact finger 51 and the moving contact 12 is ensured, and the conduction resistance is reduced. The reduction of the resistance reduces the Joule heat and improves the service life of the contact finger 51.

[0045] During the working process, the contact section 72 of the contact finger 51 contacts the moving contact 12. To ensure that the contact finger 51 has sufficient elasticity, the root fillet R of the contact finger 51 is increased as much as possible on the premise of ensuring the inner diameter D during the design process. The inner diameter D of the reed 43, the outer diameter d of the contact section 72, the number and inclination angle θ of the contact fingers 51 are determined by comprehensive consideration according to the requirements of the contact resistance. Heat treatment is carried out when processing the reed 43 to ensure the elasticity of the contact finger 51. The good elasticity of the contact finger 51 is conducive to ensuring good contact between the static contact 11 and the moving contact 12, thereby reducing the conduction resistance.

[0046] The lifting device 15 is connected to the moving contact 12 to drive the up and down movement of the moving contact 12, so that the moving contact 12 contacts and separates from all the contact fingers 51. Further, the moving contact 12 is connected to the lifting device 15 through a support column 13 to support the moving contact 12.

[0047] The length L of the moving contact 12 is determined according to the spacing between the static contacts 11, ensuring that the upper and lower ends of the copper core contact the reeds 43 in the static contact 11, and at the same time ensuring that the moving contact 12 is coaxial with the reeds 43 in the static contact 11. The moving contact 12 is welded by an upper end cover 81, a metal tube 82 and a lower end cover 83. The material of the metal tube 82 is red copper; the upper end cover 81 is connected to the upper end 31 of the moving contact, and the lower end cover 83 is connected to the lower end 32 of the moving contact. The outer diameter d of the moving contact 12 is determined according to the inner diameter D of the reed 43 in the free state, controlling the compression amount of the contact fingers 51 of the reed 43 to ensure that the contact resistance is within the required range, and at the same time ensuring the surface finish of the outer surface of the copper core. The lower end cover 83 is designed with flange mounting threaded holes.

[0048] The lifting device 15 is composed of a lead screw-nut motion mechanism 101, a reducer 102 and a motor. The flange on the lead screw-nut motion mechanism 101 fixes the moving contact 12 through a support column 13. The motor drives the moving contact 12 fixed on the lead screw-nut motion mechanism 101 to move up and down through the reducer 102. The stroke of the lifting device 15 is determined according to the type of high-frequency high-power switch (single-pole single-throw and single-pole double-throw). The motor is designed with a non-magnetic shielding cover to prevent the motor from heating up during operation in a high-frequency high-power environment. The load of the lifting device 15 is calculated according to the weight of the moving contact 12 and the friction force during the up and down movement. The material of the support column 13 is a high-strength high-frequency insulating material such as polyethylene and epoxy resin to further ensure the tightness of the connection.

[0049] The lead screw nut motion mechanism 101 mainly converts rotational motion into linear motion or vice versa. In the present invention, it converts the rotational motion of the lead screw nut into the linear motion of the moving contact 12, thereby controlling the contact between the moving contact 12 and the static contact 11. The lead screw nut motion mechanism 101 has the characteristic of smooth rotation and can well control the up and down movement of the lead screw, thus driving the up and down movement of the moving contact 12 connected by the support pillar 13, with good stability.

[0050] The controller 17 is used to control the rising and falling of the lifting device 15. The controller 17 is mounted on the side of the support frame 16. The motor 103 is fixed on the support frame to drive the lead screw nut motion mechanism 101.

[0051] It should be understood that the above are many different embodiments or examples of different features of this embodiment. The specific examples of the components and arrangements described above are used to simplify the description of the embodiments.

[0052] Of course, these are only examples and are not used to limit the specific implementation manners. For example, the element sizes are not limited to the disclosed ranges or values, but can be determined according to the process conditions or the properties required by the device. Such as the inner diameter D of the contact section 72, the radius R of the arc section of the contact finger 51, the length L and diameter d of the metal tube 82 of the moving contact 12, etc., can be determined according to the actual situation.

[0053] Furthermore, in the description, the first feature is formed above or on the second feature, which may include embodiments in which the first feature and the second feature are formed in a direct contact manner, and may also include additional features that may be formed in embodiments inserted between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact. For simplicity and clarity of description, various features can be arbitrarily drawn in different proportions. For example, the lowest support plate 45 in the support base can be connected to the support base through the support rod 14 or directly fixed on the support frame 16.

[0054] Furthermore, relative spatial terms may be used herein, such as "under", "below", "lower", "above", "higher", etc., to facilitate the description of the relationship between one element or feature and another element or feature as depicted in the drawings. These relative spatial terms cover not only the directions depicted in the drawings but also different directions in the use or operation of the device. The device may be positioned in different ways (e.g., rotated 90 degrees or in other orientations), and the relative spatial descriptions used herein can also have corresponding interpretations.

[0055] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-frequency high-power switch, comprising a static contact, a moving contact, a support base and a lifting device, characterized in that: The static contact and the lifting device are both fixed on the support base; The number of the static contacts is more than two, and these static contacts are arranged vertically; For each of the static contacts, it respectively includes a wiring board and two reed assemblies, and the two reed assemblies clamp the wiring board and are fixedly connected together; For each of the reed assemblies, it respectively includes a reed and two pressure rings. The reed includes a support ring and a plurality of finger contacts circumferentially arranged on the support ring. The finger contacts are stamping-formed S-shaped elastic pieces; the two pressure rings clamp the support ring and are fixedly connected together; The lifting device is connected to the moving contact to drive the up and down movement of the moving contact, so that the moving contact contacts and separates from all the finger contacts on the static contact. The static contact further includes a guide ring for guiding the moving contact during the up and down movement.

2. The high-frequency high-power switch according to claim 1, characterized in that, The support base includes a support frame, multiple layers of support rod groups and multiple layers of support plates. The multiple layers of support rod groups are arranged vertically in layers. Each layer of support rod group has multiple vertically arranged support rods. These support plates are also arranged vertically and are connected by the support rods. Each support plate is horizontally arranged. The lowermost support plate is installed on the support frame through the support rod group. The lifting device is installed on the support frame. Each static contact is respectively installed on one of the support plates.

3. A high-frequency high-power switch according to claim 1, characterized in that, The moving contact is connected to the lifting device through a pillar to support the moving contact.

4. A high-frequency high-power switch according to claim 1, characterized in that, The finger contacts are subjected to hot processing to make the elasticity of the finger contacts meet the set requirements.

5. A high-frequency high-power switch according to claim 1, characterized in that, The material of the finger contacts is beryllium bronze, and its surface is silver-plated.

6. A high-frequency high-power switch according to claim 1, characterized in that The finger contact includes an arc segment, a straight segment, a contact segment and a tail segment, and they are connected in sequence. The contact segment is the part where the static contact contacts the moving contact. The arc segment of the finger contact is connected to the support ring.

7. A high-frequency high-power switch according to claim 6, characterized in that, The angle formed by the straight segment and the support ring is θ, and its range is 45°≤θ<90°.

8. A high-frequency high-power switch according to claim 1, characterized in that, The moving contact includes an upper end cover, a metal tube and a lower end cover, and they are connected and fixed in sequence from top to bottom. The material of the metal tube is red copper.

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