Vacuum switch tube applied to high-frequency switch

Abstract

The utility model relates to the technical field of high-frequency switches, in particular to a vacuum switch tube applied to a high-frequency switch, which comprises a movable conducting rod and a static conducting rod, a movable contact blade is mounted at the end of the movable conducting rod, a static contact blade is mounted at the end of the static conducting rod, and the movable contact blade is in contact with the static contact blade. The outer sides of the movable conducting rod and the static conducting rod are sleeved with a porcelain shell, and a shielding cylinder is installed in the porcelain shell close to the contact face of the movable contact piece and the static contact piece. According to the vacuum switch tube applied to the high-frequency switch, a certain number of axial vertical grooves are innovatively formed in the cylindrical surfaces of the movable conducting rod and the static conducting rod, so that the conducting sectional area of the conducting rods is effectively increased, and the influence of the skin effect of current in a high-frequency circuit on the conducting sectional area of the movable conducting rod and the static conducting rod is remarkably reduced. By means of the design, current flows through the conductive rod and gathers in the conductive rod, and therefore the use efficiency and the high-frequency current bearing capacity of the conductive rod are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-frequency switching, and more specifically, to a vacuum switch tube applied to high-frequency switching. Background Technique

[0002] In the fields of power electronics and high-frequency switching technology, a vacuum switch tube, also known as a vacuum interrupter, as a key electro-vacuum device, is widely used in various high-frequency switching circuits to be responsible for the on and off operations of the circuit. Its core lies in using a pair of alloy material electrodes (contacts) sealed in a vacuum to achieve circuit control under the drive of an operating mechanism. However, with the development of modern power electronic systems towards high frequency and high efficiency, traditional vacuum switch tubes face significant challenges when carrying high-frequency currents.

[0003] In DC or low-frequency circuits, the current is evenly distributed between the moving and static conducting rods and electrodes of the vacuum switch tube, and the cross-sectional area of the conducting rod directly determines its current-carrying capacity. However, when applied to high-frequency circuits, the skin effect becomes particularly significant, and the current tends to concentrate in a thin layer on the outer surface of the conducting rod, resulting in an increase in the equivalent resistance of the conducting rod and a corresponding increase in the power loss. To overcome this problem, traditional methods often require increasing the diameters of the moving and static conducting rods, which not only increases the volume of the switch tube but also significantly raises the manufacturing cost, causing a waste of resources. Content of the Utility Model

[0004] The purpose of the present utility model is to provide a vacuum switch tube applied to high-frequency switching to solve the problem proposed in the above background technique that when applied to high-frequency circuits, the skin effect becomes particularly significant, the current tends to concentrate in a thin layer on the outer surface of the conducting rod, resulting in an increase in the equivalent resistance of the conducting rod and a corresponding increase in the power loss.

[0005] To achieve the above purpose, the present utility model provides a vacuum switch tube applied to high-frequency switching, including a moving conducting rod and a static conducting rod. A moving contact piece is installed at the end of the moving conducting rod, and a static contact piece is installed at the end of the static conducting rod. The moving contact piece and the static contact piece are in contact with each other. A porcelain shell is sleeved outside the moving conducting rod and the static conducting rod, and a shielding cylinder is installed inside the porcelain shell near the contact surface of the moving contact piece and the static contact piece.

[0006] Preferably, a moving end cap is installed at one end of the porcelain shell close to the moving conducting rod, and a static end cap is installed at one end of the porcelain shell close to the static conducting rod.

[0007] Preferably, a bellows is sleeved outside the moving conducting rod. One end of the bellows is fixed on the moving conducting rod, and the other end abuts against the inner side of the moving end cap.

[0008] Preferably, a fixing ring is installed outside the moving end cover near the moving conductive rod, and a guiding sleeve is installed inside the fixing ring near the moving conductive rod.

[0009] Preferably, a number of axial vertical grooves are provided on the cylindrical surfaces of the moving conductive rod and the static conductive rod to increase the conductive cross-sectional area of the conductive rod and reduce the influence of the skin effect of the current in the high-frequency circuit on the conductive cross-sectional areas of the moving and static conductive rods.

[0010] Preferably, both the moving contact piece and the static contact piece are circular structures and have the same diameter, and the diameter of the moving contact piece is larger than the cross-sectional diameters of the moving conductive rod and the static conductive rod.

[0011] Preferably, a number of annular grooves are provided on the outer wall of the porcelain shell.

[0012] Preferably, a sealing ring is installed at the top end of the bellows.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] Applied to the vacuum switch tube for high-frequency switches, by innovatively providing a certain number of axial vertical grooves on the cylindrical surfaces of the moving and static conductive rods, the conductive cross-sectional area of the conductive rods is effectively increased, and the influence of the skin effect of the current in the high-frequency circuit on the conductive cross-sectional areas of the moving and static conductive rods is significantly reduced. This design enables the current flow path to gather towards the inside of the conductive rod, thereby improving the use efficiency of the conductive rod and its ability to carry high-frequency current.

[0015] In addition, both the moving contact piece and the static contact piece adopt circular structures with the same diameter and are larger than the cross-sectional diameters of the moving and static conductive rods, further ensuring the stable transmission of current. The detailed designs such as the annular grooves provided on the outer wall of the porcelain shell and the sealing ring at the top end of the bellows also greatly enhance the sealing performance and stability of the switch tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the present utility model;

[0017] Figure 2 is the structural schematic diagram of the moving conductive rod in the present utility model;

[0018] Figure 3 is the structural schematic diagram of the static conductive rod in the present utility model.

[0019] The meanings of the various reference numerals in the figures are as follows:

[0020] 1. Moving conductive rod; 2. Guiding sleeve; 3. Fixing ring; 4. Moving end cover; 5. Bellows; 6. Porcelain shell; 7. Shielding cylinder; 8. Moving contact piece; 9. Static contact piece; 10. Static conductive rod; 11. Static end cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] The present invention provides a vacuum switch tube applied to a high-frequency switch, as Figures 1-3 shown, which includes a moving conductive rod 1 and a static conductive rod 10. A moving contact piece 8 is installed at the end of the moving conductive rod 1, and a static contact piece 9 is installed at the end of the static conductive rod 10. The moving contact piece 8 and the static contact piece 9 are in contact with each other. A porcelain shell 6 is sleeved outside the moving conductive rod 1 and the static conductive rod 10. A shielding cylinder 7 is installed inside the porcelain shell 6 near the contact surface of the moving contact piece 8 and the static contact piece 9. Through a clever structural design, an effective electrical connection between the moving conductive rod 1 and the static conductive rod 10 is achieved. The mutual contact design of the moving contact piece 8 and the static contact piece 9 ensures the smooth transmission of current. At the same time, the sleeving of the porcelain shell 6 not only provides necessary mechanical protection for the switch tube, but also effectively reduces the influence of the outside on the internal electric field and magnetic field of the switch tube through the shielding cylinder 7 inside it, improving the electrical performance and stability of the switch tube. This design enables the vacuum switch tube to perform excellently in high-frequency switch applications and can meet the high requirements of high-frequency circuits for the performance and stability of the switch tube.

[0023] In this embodiment, a moving end cover 4 is installed at one end of the porcelain shell 6 close to the moving conductive rod 1, and a static end cover 11 is installed at one end of the porcelain shell 6 close to the static conductive rod 10 to ensure the sealing at both ends of the porcelain shell 6.

[0024] Specifically, a bellows 5 is sleeved outside the moving conductive rod 1. One end of the bellows 5 is fixed on the moving conductive rod 1, and the other end abuts against the inner side of the moving end cover 4 to ensure the sealing between the moving conductive rod 1 and the moving end cover 4.

[0025] Furthermore, a fixing ring 3 is installed outside the moving end cover 4 near the moving conductive rod 1, and a guide sleeve 2 is installed inside the fixing ring 3 near the moving conductive rod 1 for the sliding guidance of the moving conductive rod 1.

[0026] Furthermore, a number of axial vertical grooves are provided on the cylindrical surfaces of the moving conductive rod 1 and the static conductive rod 10 to increase the conductive cross-sectional area of the conductive rods and reduce the influence of the skin effect of the current in the high-frequency circuit on the conductive cross-sectional areas of the moving and static conductive rods.

[0027] Furthermore, both the moving contact piece 8 and the static contact piece 9 are circular structures with the same diameter. The diameter of the moving contact piece 8 is larger than the cross-sectional diameters of the moving conductive rod 1 and the static conductive rod 10, increasing the contact area between the moving contact piece 8 and the static contact piece 9.

[0028] Furthermore, several annular grooves are provided on the outer wall of the porcelain shell 6. This design not only enhances the mechanical strength of the porcelain shell and improves its ability to resist external force impacts, but also effectively increases the surface area of the porcelain shell, which is beneficial for the switch tube to dissipate heat better during operation and maintain a lower operating temperature.

[0029] Furthermore, a sealing ring is installed at the top of the bellows 5 to improve the sealing effect at the top of the bellows 5.

[0030] When the vacuum switch tube of the present utility model applied to a high-frequency switch is in use, first, when the high-frequency switch is in the closed state, the moving conductive rod 1 drives the moving contact piece 8 to approach and closely contact the static contact piece 9 under the action of an external operating mechanism, forming a conductive path. At this time, the current is smoothly transmitted through the moving conductive rod 1, the moving contact piece 8, the static contact piece 9, and the static conductive rod 10, meeting the requirements of the high-frequency circuit for current on-off. The porcelain shell 6, as a protective shell, not only provides necessary mechanical support but also effectively isolates the influence of external electric and magnetic fields on the internal working environment of the switch tube through the shielding cylinder 7 inside it, ensuring the electrical performance and stability of the switch tube.

[0031] At the same time, the design of the annular grooves on the outer wall of the porcelain shell 6 enhances the mechanical strength of the porcelain shell and improves its ability to resist external force impacts. And during the operation of the switch tube, the heat dissipation is promoted by increasing the surface area, which helps to maintain a lower operating temperature of the switch tube and extend its service life.

[0032] The setting of the bellows 5 not only ensures the sealing between the moving conductive rod 1 and the moving end cover 4 but also allows the moving conductive rod 1 to perform sliding movement within a specified range to complete the closing and opening operations of the circuit. The sealing ring at the top of the bellows 5 further improves the sealing effect and prevents the leakage of gas inside the vacuum chamber.

[0033] When the high-frequency switch needs to disconnect the circuit, the external operating mechanism makes the moving conductive rod 1 move in the reverse direction, driving the moving contact piece 8 to separate from the static contact piece 9, and the circuit is immediately disconnected. During this process, the axial vertical groove design on the moving conductive rod 1 and the static conductive rod 10 effectively alleviates the skin effect of the current in the high-frequency circuit, ensuring the good conductive performance of the conductive rod at high frequencies.

[0034] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present utility model, which are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum switch tube for high-frequency switching, comprising a moving conductive rod (1) and a stationary conductive rod (10), characterized in that: A moving contact piece (8) is installed at the end of the moving conductive rod (1), and a stationary contact piece (9) is installed at the end of the stationary conductive rod (10); the moving contact piece (8) and the stationary contact piece (9) are in contact with each other; a ceramic shell (6) is sleeved on the outer side of the moving conductive rod (1) and the stationary conductive rod (10); and a shielding cylinder (7) is installed inside the ceramic shell (6) near the contact surface between the moving contact piece (8) and the stationary contact piece (9).

2. The vacuum switch tube for high-frequency switching according to claim 1, characterized in that: A moving end cover (4) is installed at one end of the ceramic shell (6) close to the moving conductive rod (1), and a stationary end cover (11) is installed at one end of the ceramic shell (6) close to the stationary conductive rod (10).

3. The vacuum switch tube for high-frequency switching according to claim 2, characterized in that: A bellows (5) is sleeved on the outer side of the moving conductive rod (1), one end of the bellows (5) is fixed on the moving conductive rod (1), and the other end abuts against the inner side of the moving end cover (4).

4. The vacuum switch tube for high-frequency switching according to claim 2, characterized in that: A fixing ring (3) is installed on the outside of the moving end cover (4) near the moving conductive rod (1), and a guide sleeve (2) is installed on the inside of the fixing ring (3) near the moving conductive rod (1).

5. The vacuum switch tube for high-frequency switching according to claim 1, characterized in that: A plurality of axial vertical grooves are arranged on the cylindrical surfaces of the moving conductive rod (1) and the static conductive rod (10).

6. The vacuum switch tube for high frequency switching according to claim 1, characterized in that: The moving contact piece (8) and the stationary contact piece (9) are both circular structures and have the same diameter. The diameter of the moving contact piece (8) is larger than the cross-sectional diameters of the moving conductive rod (1) and the stationary conductive rod (10).

7. The vacuum switch tube for high-frequency switching according to claim 1, characterized in that: The outer wall of the ceramic shell (6) is provided with a plurality of annular grooves.

8. The vacuum switch tube for high-frequency switching according to claim 3, characterized in that: A sealing ring is installed at the top end of the bellows (5).

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