High-power waveguide sealing connection structure for electron accelerator

Abstract

The utility model discloses a high-power waveguide sealing connection structure for an electron accelerator, which comprises a front straight waveguide, a rear straight waveguide, a flat flange, a double-groove type flange and a metal gasket, and the corresponding end faces of the front straight waveguide and the rear straight waveguide are respectively connected with the flat flange and the double-groove type flange. The flat flange and the double-groove type flange are connected with each other through respective sealing end surfaces; an annular stepped groove is formed in the sealing end face of the double-groove type flange, surrounding edges are arranged inside and outside the stepped groove, the stepped groove comprises a positioning groove and an auxiliary groove, the metal gasket is provided with a protruding annular positioning frame, the metal gasket is arranged between the flat flange and the double-groove type flange in a cushioned mode, and the positioning frame is connected with the positioning groove in a matched mode. According to the utility model, the sealing problem of high-power waveguide installation is solved, good electric contact of the butt joint plane of the two waveguide metal flanges during high-power microwave transmission operation is realized, high-power microwaves are prevented from escaping, vacuum in the waveguide is ensured, and stable transmission of the high-power microwaves is ensured.

Description

Technical Field

[0001] This utility model relates to the field of sealing window equipment for high-energy irradiated linear electron accelerators, and specifically to a high-power waveguide sealing connection structure for electron accelerators. Background Technology

[0002] In microwave transmission in high-energy electron accelerators, two waveguide flanges need to be connected. During megawatt-level continuous high-power microwave transmission, the entire waveguide cavity needs to be in a high vacuum and purged with nitrogen to a pressure of more than 2 atmospheres to improve the breakdown of the electric field inside the waveguide, thereby increasing the power capacity. This requires good electrical contact at the connection between the two waveguide sections and the ability to achieve a high vacuum sealing effect.

[0003] Currently, there are two main types of commonly used connection methods:

[0004] One method involves connecting two flat flanges, with a metal gasket of the same length and width as the flanges placed between the sealing surfaces of the two flanges. In this type of connection, the two flanges have large contact surfaces and high rigidity. Due to tolerances in flange machining and welding, the contact surfaces cannot be perfectly flat when the two flanges are mated, making a seal difficult. In this method, the gasket is positioned based on the length and width dimensions of the two flange edges. Since there are certain machining errors in the flange edges, it is difficult to ensure that the inner window of the gasket is on the same plane as the inner window of the waveguide metal flange. This can easily lead to misalignment or protrusion from the flange edges, causing arcing.

[0005] Another type is the channel flange, with a rubber sealing ring in the middle for sealing. In high-power microwave transmission with average power in the hundreds of millions or even trillions, the heat generated by waveguide loss can cause the waveguide and rubber temperatures to rise, making the rubber prone to aging and deformation, leading to air leakage. Furthermore, in practical applications, when the rubber ring is present, it can easily cause the connection between the sealing surfaces of the two waveguide flanges to not be completely aligned, resulting in tiny gaps. This affects the electrical contact between the waveguide metal flange surfaces, and during high-power microwave transmission, microwaves can easily accumulate and escape from these gaps, causing arcing, damaging the waveguide, and affecting the transmission of high-power microwaves. Utility Model Content

[0006] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a high-power waveguide sealed connection structure for electron accelerators, which can achieve good electrical contact between the mating metals of the two waveguides during high-power microwave operation, while ensuring a vacuum-sealed environment inside the waveguide to prevent microwave escape from causing arcing and equipment damage.

[0007] The objective of this utility model is achieved through the following technical solution: a high-power waveguide sealing connection structure for electron accelerators, comprising a front straight waveguide, a rear straight waveguide, a flat flange, a double-groove flange, and a metal gasket. The corresponding end faces of the front and rear straight waveguides are respectively connected to the flat flange and the double-groove flange, and the flat flange and the double-groove flange are connected to each other through their respective sealing end faces. The sealing end face of the double-groove flange is provided with an annular stepped groove, and the stepped groove is provided with rims on both the inner and outer sides. The stepped groove includes a positioning groove and an auxiliary groove. The metal gasket is provided with a raised annular positioning frame. The metal gasket is placed between the flat flange and the double-groove flange, and the positioning frame is matched and connected to the positioning groove.

[0008] Specifically, the depth of the positioning groove is greater than that of the auxiliary groove, and the auxiliary groove is located on the periphery of the positioning groove.

[0009] Furthermore, it also includes a bolt assembly, wherein the flat flange has multiple bolt holes through it, and the double-groove flange has multiple bolt holes through it at the position of the auxiliary groove, and the flat flange and the double-groove flange are connected as one unit by the bolt assembly.

[0010] Furthermore, the two end faces of the metal gasket are each provided with at least one sealing boss, and the sealing boss protrudes vertically outward with its respective end face as the base to form an annular edge, and the sealing boss has a corresponding compression amount.

[0011] Specifically, the sealing bosses are all located between the positioning frame and the window of the metal gasket. The sealing bosses contact the sealing end face of the double-groove flange or the sealing end face of the flat flange. The sealing bosses can deform when squeezed.

[0012] Preferably, the two end faces of the metal gasket are provided with two sealing bosses, which correspond to each other.

[0013] Specifically, the metal gasket is a high-conductivity metal sealing gasket, which is annular with a window in the middle.

[0014] Specifically, the double-groove flange and the flat flange are metal flanges.

[0015] Furthermore, the positioning groove and the positioning frame are matched with tolerances.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. This utility model uses a double-groove flange to replace the existing flat flange. The stepped groove formed by the double-groove flange and the structure of the inner and outer edges effectively enhance the sealing performance, solve the pain point of sealing during high-power waveguide installation, and achieve good electrical contact between the two waveguide metal flanges during high-power microwave transmission. There is no high-power microwave escape, while ensuring the vacuum inside the waveguide, increasing the power capacity inside the waveguide, and ensuring stable transmission of high-power microwaves.

[0018] 2. The positioning groove and positioning frame of this utility model are connected with tolerance matching, which not only ensures the positioning accuracy of the metal gasket and the double groove flange, but also ensures the uniformity of the window positions of the metal gasket, the flat flange and the double groove flange during installation.

[0019] 3. The metal gasket of this utility model has two sets of sealing bosses with compression margin on both sides, which is a double-safety structure that can ensure both good electrical contact and high vacuum sealing performance.

[0020] 4. This invention has been verified in high-power microwaves in a high-energy irradiated linear electron accelerator. It operated at high power continuously for a week with good sealing effect and no microwave escape or arcing occurred, thus verifying the feasibility of this sealing connection structure.

[0021] 5. This utility model can be widely applied to waveguide transmission in various high-power microwave systems, such as accelerators and high-power klystron output port connections. As a reliable sealed connection structure, it ensures good electrical contact between the mating metals of the waveguides at both ends during high-power microwave operation, while maintaining a vacuum-sealed environment within the waveguide. This enhances the power capacity within the waveguide, prevents microwave escape and arcing that could damage the equipment, and guarantees stable and reliable transmission of high-power microwaves. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is an exploded view of the present invention.

[0024] Figure 3 This is a top view of the present invention.

[0025] Figure 4 for Figure 3 AA sectional view.

[0026] Figure 5 for Figure 4 A magnified view of part B.

[0027] Figure 6 This is a partial sectional view of a double-groove flange.

[0028] Figure 7This is a partial cross-sectional view of the metal gasket.

[0029] Figure 8 This is a structural schematic diagram of a double-groove flange.

[0030] Figure 9 This is a schematic diagram of a flat flange.

[0031] Figure 10 This is a schematic diagram of the structure of a metal gasket.

[0032] Figure 11 for Figure 10 A magnified view of part C.

[0033] In the picture:

[0034] 10-Front straight waveguide; 20-Rear straight waveguide; 30-Flat flange; 31-First fixed end face; 32-First sealing end face; 33-First bolt hole; 40-Double groove flange; 41-Second fixed end face; 42-Second sealing end face; 421-First perimeter; 422-Second perimeter; 424-Positioning groove; 425-Auxiliary groove; 46-Second bolt hole; 50-Metal gasket; 51-Window; 53-First end face; 54-Second end face; 56-Positioning frame; 58-Sealing boss; 60-Bolt assembly. Detailed Implementation

[0035] To facilitate understanding of this utility model, the technical solutions and advantages of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Any mechanisms or methods not elaborated in this utility model can be referred to in the prior art. The specific structure and features of this utility model are illustrated below by way of example and should not constitute any limitation on this utility model. Furthermore, any technical feature mentioned below (including implicit or disclosed features), as well as any technical feature directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form more other embodiments that may not be directly or indirectly mentioned in this utility model. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0036] like Figure 1-11As shown, the high-power waveguide sealing connection structure for an electron accelerator in this embodiment includes a front straight waveguide 10, a rear straight waveguide 20, a flat flange 30, a double-groove flange 40, a metal gasket 50, and multiple bolt assemblies 60. The corresponding end faces of the front straight waveguide 10 and the rear straight waveguide 20 are respectively connected to the flat flange 30 and the double-groove flange 40. The metal gasket 50 is placed between the flat flange 30 and the double-groove flange 40. The bolt assemblies 60 fix and lock the flat flange 30 and the double-groove flange 40 together, so that the front straight waveguide 10 and the rear straight waveguide 20 are connected in a high-vacuum sealed connection.

[0037] Specifically, the flat flange 30 is a metal flange, which includes two end faces. One end face is connected to the front straight waveguide 10 or the rear straight waveguide 20 by vacuum welding, and it is the first fixed end face 31. The other end face is sealed to the double groove flange 40, and it is the first sealing end face 32. The flat flange 30 has multiple first bolt holes 33 through it to match the bolt assembly 60.

[0038] The double-groove flange 40 is a metal flange comprising two end faces. One end face is connected to the front straight waveguide 10 or the rear straight waveguide 20 via vacuum welding, serving as the second fixed end face 41. The other end face is sealed to the flat flange 30, serving as the second sealing end face 42. The double-groove flange 40 has an annular stepped groove formed by recessing its second sealing end face 42 as the base surface. The annular stepped groove has rims on both the inner and outer sides, ensuring that the stepped groove does not communicate with the outside environment or the waveguide path after the double-groove flange 40 is connected to the flat flange 30. The rim near the window of the double-groove flange 40 is the first rim 421, and the rim near the outer perimeter of the double-groove flange 40 is the second rim 422.

[0039] The stepped groove includes a positioning groove 424 and an auxiliary groove 425. The positioning groove 424 is deeper than the auxiliary groove 425, and the auxiliary groove 425 is located around the positioning groove 424. The positioning groove 424 is used for mating and positioning with the metal gasket 50. The double-groove flange 40 has multiple second bolt holes 46 extending through the auxiliary groove 425 to mate with the bolt assembly 60.

[0040] The stepped groove forms a double-groove structure through the positioning groove 424 and the auxiliary groove 425. The stepped groove and the inner and outer edges ensure that during the connection between the double-groove flange 40 and the flat flange 30, only the first and second edges 421 protrude. Compared to surface-to-surface contact, the metal edges have better ductility and compressibility, acting similarly to a double-layer sealing ring. Therefore, the stepped groove and the structure of the inner and outer edges formed by the double-groove flange 40 effectively enhance the sealing performance.

[0041] The metal gasket 50 is a high-conductivity metal sealing gasket, which is annular with a window 51 in the center. The metal gasket 50 has two end faces: one end face 53 connects to the double-groove flange 40, and the other end face 54 connects to the flat flange 30. The metal gasket 50 protrudes vertically outward from its first end face 53 to form an annular edge strip, which is located on the outermost edge of the metal gasket 50, making the longitudinal section of any side of the metal gasket 50 L-shaped. This annular edge strip serves as the positioning frame 56 of the metal gasket 50, and the positioning frame 56 is tolerance-matched to the positioning groove 424 of the double-groove flange 40. The matching connection between the positioning frame 56 and the positioning groove 424 ensures both the positioning accuracy of the metal gasket 50 and the double-groove flange 40, and also ensures the uniformity of the window 51 positions of the metal gasket 50, the flat flange 30, and the double-groove flange 40 during installation.

[0042] The metal gasket 50 is also provided with a plurality of sealing bosses 58, which are respectively disposed on the first end face 53 and the second end face 54 of the metal gasket 50. The sealing bosses 58 on the first end face 53 protrude vertically outward with the first end face 53 as the base to form a ring-shaped edge, and the sealing bosses 58 on the second end face 54 protrude vertically outward with the second end face 54 as the base to form a ring-shaped edge. The protrusion height of the sealing bosses 58 is much smaller than the protrusion height of the positioning frame 56. The sealing bosses 58 on the first end face 53 and the sealing bosses 58 on the second end face 54 are both located between the positioning frame 56 and the window 51 of the metal gasket 50. In this preferred embodiment, there are two sealing bosses 58 on the first end face 53 and two sealing bosses 58 on the second end face 54, and they correspond to each other in pairs.

[0043] The sealing boss 58 on the first end face 53 contacts the second sealing end face 42 of the double-groove flange 40. Specifically, the sealing boss 58 on the first end face 53 contacts the first perimeter 421 of the double-groove flange 40, and the sealing boss 58 on the second end face 54 contacts the first sealing end face 32 of the flat flange 30. The sealing boss 58 has a corresponding compression amount. When the double-groove flange 40 and the flat flange 30 are tightened together by the bolt assembly, the sealing boss 58 will be squeezed and deformed to ensure a sealed connection between the double-groove flange 40 and the flat flange 30. The sealing boss 58 of the metal gasket 50 has a double-safety structure, which can ensure both good electrical contact and high vacuum sealing performance.

[0044] Compared with existing technologies, the high-power waveguide sealed connection structure of this embodiment can be widely used in waveguide transmission of various high-power microwave systems, such as accelerators and high-power klystron output port connections. As a reliable sealed connection structure, it can ensure good electrical contact between the mating metals of the waveguides at both ends during high-power microwave operation, while maintaining a vacuum-sealed environment within the waveguide. This improves the power capacity within the waveguide, prevents microwave escape and arcing that could damage the equipment, and ensures stable and reliable transmission of high-power microwaves.

[0045] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A high power waveguide seal connection structure for an electron accelerator, characterized by, The system includes a front straight waveguide, a rear straight waveguide, a flat flange, a double-groove flange, and a metal gasket. The corresponding end faces of the front and rear straight waveguides are connected to the flat flange and the double-groove flange, respectively. The flat flange and the double-groove flange are connected to each other through their respective sealing end faces. The sealing end face of the double-groove flange is provided with an annular stepped groove, and the stepped groove is surrounded by rims on both the inner and outer sides. The stepped groove includes a positioning groove and an auxiliary groove. The metal gasket is provided with a raised annular positioning frame. The metal gasket is placed between the flat flange and the double-groove flange, and the positioning frame is matched and connected to the positioning groove.

2. The high power waveguide sealed junction structure of claim 1, wherein, The depth of the positioning groove is greater than that of the auxiliary groove, and the auxiliary groove is located on the periphery of the positioning groove.

3. The high power waveguide sealed junction structure of claim 2, wherein, It also includes a bolt assembly, wherein the flat flange has multiple bolt holes through it, and the double-groove flange has multiple bolt holes through it at the position of the auxiliary groove. The flat flange and the double-groove flange are connected as one unit by the bolt assembly.

4. The high power waveguide sealed junction structure of claim 1, wherein, The metal gasket has at least one sealing boss on each of its two end faces. The sealing boss protrudes vertically outward with its respective end face as the base to form an annular edge. The sealing boss has a corresponding compression amount.

5. The high power waveguide sealed junction structure of claim 4, wherein, The sealing bosses are all located between the positioning frame and the window of the metal gasket. The sealing bosses contact the sealing end face of the double groove flange or the sealing end face of the flat flange. The sealing bosses can deform when squeezed.

6. The high power waveguide sealed junction structure of claim 5, wherein, The metal gasket has two sealing bosses on each of its two end faces, and they correspond to each other.

7. The high power waveguide sealed junction structure of claim 1, wherein, The metal gasket is a high-conductivity metal sealing gasket, which is annular with a window in the middle.

8. The high power waveguide sealed junction structure of claim 1, wherein, The double-groove flange and the flat flange are metal flanges.

9. The high power waveguide sealed junction structure of claim 1, wherein, The positioning groove and the positioning frame are fitted with tolerances.

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