A fixing structure of a vacuum interrupter shielding tube and a sealing method thereof

Abstract

The present invention discloses a fixing structure for a shielding tube of a vacuum arc chamber and a method for sealing the same, belonging to the technical field of vacuum arc chambers. The structure includes a porcelain shell, a shielding tube is provided in the porcelain shell, the inner wall of the shielding tube is coated with a reinforcing pad, the upper portion of the outer wall of the shielding tube is fixedly connected to the inner wall of a pressure plate, and the pressure plate is inserted into a limiting groove. The fixing structure for the shielding tube of a vacuum arc chamber and the method for sealing the same, in the process of the upper sealing ring moving downward, squeezes the lower sealing ring, and the sealing rings that fit tightly to each other further improve the sealing effect, and the top cover and the end cover are cast-welded to achieve overall sealing of the shielding tube. Through the mutual cooperation between the sealing gasket, rubber interlayer, sealing ring and sealing block, the various components of the vacuum arc chamber are fixedly sealed and then sealed by cast-welding, further improving the sealing effect of the overall vacuum arc chamber, and the invention is very applicable.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum interrupter chambers, and in particular relates to a fixing structure of a shielding tube of a vacuum interrupter chamber and a sealing method thereof. Background Art

[0002] The vacuum interrupter, also known as the vacuum switch tube, is the core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from the power supply through the excellent insulation of the vacuum inside the tube, thereby avoiding accidents and unexpected events. The shielding tube used in the vacuum interrupter is an indispensable supporting component of the vacuum interrupter. The function of the shielding tube is to surround the interference source of the system with a shielding body to prevent the interference electromagnetic field from spreading outward. At the same time, the shielding body surrounds the entire equipment or system to prevent them from being affected by the external electromagnetic field.

[0003] The shielding tube fixing method uses existing brazing materials to directly weld the shielding tube and the porcelain shell, resulting in excessive coaxiality deviation between the shielding tube and the porcelain shell, affecting the uniform distribution of the electric field inside the vacuum interrupter and reducing the sealing effect of the vacuum interrupter. In addition, the liquid brazing material evaporated during brazing will affect the insulation performance of the vacuum interrupter. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a fixing structure of a shielding tube of a vacuum arc chamber and a method for sealing the same, which solves the problem that the shielding tube fixing method uses existing brazing materials to directly weld the shielding tube and the porcelain shell, resulting in excessive coaxiality deviation between the shielding tube and the porcelain shell, affecting the uniform distribution of the electric field inside the vacuum arc chamber, reducing the sealing effect of the vacuum arc chamber, and the liquid solder evaporated during brazing will affect the insulation performance of the vacuum arc chamber.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a fixing structure for a shielding tube of a vacuum arc chamber, comprising a porcelain shell, a shielding tube arranged in the porcelain shell, the inner wall of the shielding tube being coated with a reinforcing pad, the upper portion of the outer wall of the shielding tube being fixedly connected to the inner wall of the pressure plate, the pressure plate being inserted into a limiting groove, the limiting groove being provided on the upper surface of a limiting ring, the limiting ring being fixedly connected to the inner wall of the porcelain shell, the inner wall of the porcelain shell being fixedly connected with a threaded tube, the inner thread of the threaded tube being connected with an external thread, the external thread being provided on the outer wall of the shielding tube, the upper surface of the porcelain shell being threadedly connected with an end cover, the upper surface of the end cover being provided with a threaded groove, the inner surface of the threaded groove being threaded with a top cover.

[0008] As a further solution of the present invention: the lower surface of the end cover is fixedly connected to the upper surface of the sealing block, the sealing block is clamped in the inclined groove opened on the upper surface of the porcelain shell, and the sealing block is arranged in a ring shape.

[0009] As a further solution of the present invention, the lower portion of the inner wall of the ceramic shell is fixedly connected to the outer wall of the rubber barrier layer, and the inner wall of the rubber barrier layer is clamped in a sealing groove provided on the outer wall of the shielding tube.

[0010] As a further solution of the present invention: the sealing gasket provided on the lower surface of the pressing plate overlaps with the upper surface of the limiting ring.

[0011] As a further solution of the present invention: a groove is provided on the upper surface of the end cover, and sealing rings are provided on the inner wall of the groove and the upper surface of the inner wall of the top cover, and the opposing surfaces of the two sealing rings are tightly fitted.

[0012] As a further solution of the present invention: a method for sealing a shielding tube of a vacuum interrupter comprises the following steps:

[0013] S1. First, when installing and fixing the shielding tube, the operator can insert the shielding tube from the top of the porcelain shell so that the shielding tube is located inside the porcelain shell, and press the shielding tube downward.

[0014] S2. When the external thread on the outer wall of the shielding cylinder contacts the threaded cylinder, the operator can rotate the shielding cylinder forward so that the shielding cylinder can move downward during the rotation, and the shielding cylinder will drive the sealing gasket on the pressure plate to move downward and fit tightly with the limiting ring. At the same time, the annular pressure plate will be stuck in the limiting groove opened above the limiting ring.

[0015] S3. When the shielding tube moves downward, the rubber interlayer will slide on the outer wall of the shielding tube. When the pressure plate cannot move downward, the inner wall of the rubber interlayer will be clamped in the sealing groove opened on the outer wall of the shielding tube. Then, the outer wall of the shielding tube and the porcelain shell are cast and welded to achieve fixed sealing of the shielding tube.

[0016] S4. When sealing the shielding tube inside the porcelain shell as a whole, first screw the end cover so that the end cover is threadedly connected to the inside of the porcelain shell and the sealing block is tightly attached to the inclined groove opened above the porcelain shell. Then, cast welding is performed between the end cover and the porcelain shell to achieve sealing of the end cover.

[0017] S5. When performing the last step of sealing, tighten the top cover so that it goes deep into the threaded groove during the rotation, so that the upper sealing ring squeezes the lower sealing ring during the downward movement. The sealing rings that fit tightly together further improve the sealing effect. Then, the top cover and the end cover are cast-welded to achieve the overall sealing of the shielding tube.

[0018] (3) Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The fixing structure of the shielding tube of the vacuum arc chamber and the sealing method thereof, by arranging a pressure plate, a rubber interlayer, a limiting ring, a sealing gasket and a sealing ring, when the shielding tube is installed and fixed, the shielding tube can be tightened, and the shielding tube will drive the sealing gasket on the pressure plate to move downward and fit tightly with the limiting ring. When the pressure plate cannot move downward, the inner wall of the rubber interlayer is clamped in the sealing groove opened on the outer wall of the shielding tube, and the outer wall of the shielding tube and the porcelain shell are cast-welded. Secondly, the sealing block is tightly attached to the inclined groove opened above the porcelain shell, and the end cover and the porcelain shell are cast-welded to achieve sealing of the end cover. During the downward movement of the upper sealing ring, the lower sealing ring is squeezed, and the sealing rings that fit tightly to each other further improve the sealing effect, and the top cover and the end cover are cast-welded to achieve the overall sealing of the shielding tube. Through the mutual cooperation between the sealing gasket, rubber interlayer, sealing ring and sealing block, the various components of the vacuum arc chamber are fixed and sealed and then sealed by cast welding, which further improves the sealing effect of the overall vacuum arc chamber and is very suitable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic cross-sectional structural diagram of the present invention;

[0022] Figure 2 This is an enlarged structural diagram of point A of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the limit ring of the present invention from a top view;

[0024] Figure 4 This is a schematic diagram of the structure of the rubber barrier layer of the present invention from a top view;

[0025] Figure 5 This is a schematic diagram of the structure of the sealing ring of the present invention from a top view;

[0026] In the figure: 1 porcelain shell, 2 shielding tube, 3 reinforcement pad, 4 pressure plate, 5 limit groove, 6 limit ring, 7 threaded tube, 8 external thread, 9 rubber spacer, 10 end cover, 11 sealing block, 12 top cover, 13 groove, 14 sealing ring, 15 threaded groove. DETAILED DESCRIPTION

[0027] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0028] like Figure 1-5As shown, the present invention provides a technical solution: a fixing structure of a vacuum arc chamber shielding tube, comprising a porcelain shell 1, a shielding tube 2 is arranged in the porcelain shell 1, the inner wall of the shielding tube 2 is plated with a reinforcing pad 3, the upper part of the outer wall of the shielding tube 2 is fixedly connected to the inner wall of the pressure plate 4, the pressure plate 4 is inserted into the limiting groove 5, the limiting groove 5 is opened on the upper surface of the limiting ring 6, the limiting ring 6 is fixedly connected to the inner wall of the porcelain shell 1, the inner wall of the porcelain shell 1 is fixedly connected with a threaded tube 7, the inner thread of the threaded tube 7 is connected with an external thread 8, the external thread 8 is arranged on the outer wall of the shielding tube 2, the upper surface of the porcelain shell 1 is threadedly connected with an end cover 10, the upper surface of the end cover 10 is opened with a threaded groove 15, and the inner thread of the threaded groove 15 is threadedly connected with a top cover 12.

[0029] Specifically, such as Figure 1 As shown, the lower surface of the end cover 10 is fixedly connected to the upper surface of the sealing block 11, and the sealing block 11 is clamped in the inclined groove opened on the upper surface of the porcelain shell 1. Because the inclined groove is adapted to the shape of the sealing block 11, the sealing block 11 fits more tightly in the inclined groove during the downward movement of the end cover 10, thereby further improving the sealing effect. The sealing block 11 is set to be annular.

[0030] Specifically, such as Figure 1 、 4 As shown, the lower part of the inner wall of the porcelain shell 1 is fixedly connected to the outer wall of the rubber interlayer 9. By setting the rubber interlayer 9, the inner wall of the rubber interlayer 9 is clamped in the sealing groove opened on the outer wall of the shielding tube 2. Secondly, the sealing block 11 is tightly attached to the inclined groove opened above the porcelain shell 1 to achieve sealing of the end cover 10. The inner wall of the rubber interlayer 9 is clamped in the sealing groove opened on the outer wall of the shielding tube 2. The sealing gasket set on the lower surface of the pressure plate 4 overlaps the upper surface of the limiting ring 6. By setting the sealing gasket, the shielding tube 2 will drive the sealing gasket on the pressure plate 4 to move downward and fit tightly with the limiting ring 6, thereby achieving a certain sealing effect.

[0031] Specifically, such as Figure 1 、 2 As shown in Figure 5, a groove 13 is provided on the upper surface of the end cover 10, and a sealing ring 14 is provided on the inner wall of the groove 13 and the upper surface of the inner wall of the top cover 12. Due to the provision of the sealing ring 14, the upper sealing ring 14 squeezes the lower sealing ring 14 during the downward movement, and the sealing rings 14 that fit tightly together further improve the sealing effect, thereby achieving the overall sealing of the shielding tube 2. Through the mutual cooperation between the sealing gasket, the rubber interlayer 9, the sealing ring 14 and the sealing block 11, the various components of the vacuum arc chamber are fixed and sealed and then sealed by cast welding, thereby further improving the sealing effect of the overall vacuum arc chamber, and the opposing surfaces of the two sealing rings 14 fit tightly together.

[0032] A method for sealing a shielding tube of a vacuum interrupter comprises the following steps:

[0033] S1. First, when installing and fixing the shielding cylinder 2, the operator can insert the shielding cylinder 2 from the top of the porcelain shell 1 so that the shielding cylinder 2 is located inside the porcelain shell 1, and press the shielding cylinder 2 downward.

[0034] S2. When the external thread 8 on the outer wall of the shielding tube 2 contacts the threaded tube 7, the operator can rotate the shielding tube 2 forward so that the shielding tube 2 can move downward during the rotation, and the shielding tube 2 will drive the sealing gasket on the pressure plate 4 to move downward and fit tightly with the limiting ring 6. At the same time, the annular pressure plate 4 will be stuck in the limiting groove 5 opened above the limiting ring 6.

[0035] S3. When the shielding tube 2 moves downward, the rubber interlayer 9 will slide on the outer wall of the shielding tube 2. When the pressure plate 4 cannot move downward, the inner wall of the rubber interlayer 9 will be clamped in the sealing groove opened on the outer wall of the shielding tube 2. Then, the outer wall of the shielding tube 2 and the porcelain shell 1 will be cast-welded to achieve fixed sealing of the shielding tube 2.

[0036] S4. When sealing the shielding tube 2 inside the porcelain shell 1 as a whole, first screw the end cover 10 so that the end cover 10 is threadedly connected to the inside of the porcelain shell 1, and the sealing block 11 is tightly attached to the inclined groove opened above the porcelain shell 1. Then, the end cover 10 and the porcelain shell 1 are cast-welded to achieve sealing of the end cover 10.

[0037] S5. When performing the last step of sealing, tighten the top cover 12 so that the top cover 12 penetrates into the thread groove 15 during the rotation, so that the upper sealing ring 14 squeezes the lower sealing ring 14 during the downward movement. The sealing rings 14 that fit tightly against each other further improve the sealing effect. Next, the top cover 12 and the end cover 10 are cast-welded to achieve the overall sealing of the shielding tube 2.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] The above describes in detail the preferred embodiments of this patent, but this patent is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A fixing structure for a vacuum interrupter shielding tube, comprising a porcelain shell (1), characterized in that: A shielding tube (2) is provided in the porcelain shell (1), the inner wall of the shielding tube (2) is plated with a reinforcing pad (3), the upper portion of the outer wall of the shielding tube (2) is fixedly connected to the inner wall of the pressure plate (4), the pressure plate (4) is inserted into the limiting groove (5), the limiting groove (5) is provided on the upper surface of the limiting ring (6), the limiting ring (6) is fixedly connected to the inner wall of the porcelain shell (1), the inner wall of the porcelain shell (1) is fixedly connected to a threaded tube (7), the inner thread of the threaded tube (7) is connected to an outer thread (8), the outer thread (8) is provided on the outer wall of the shielding tube (2), the upper surface of the porcelain shell (1) is threadedly connected to an end cover (10), the upper surface of the end cover (10) is provided with a threaded groove (15), the inner thread of the threaded groove (15) is connected to a top cover (12); The lower part of the inner wall of the ceramic shell (1) is fixedly connected to the outer wall of the rubber interlayer (9), the inner wall of the rubber interlayer (9) is clamped in the sealing groove provided on the outer wall of the shielding tube (2), the sealing gasket provided on the lower surface of the pressure plate (4) overlaps the upper surface of the limiting ring (6), the upper surface of the end cover (10) is provided with a groove (13), the inner wall of the groove (13) and the upper surface of the inner wall of the top cover (12) are both provided with sealing rings (14), and the opposing surfaces of the two sealing rings (14) are tightly fitted.

2. The fixing structure of the shield tube of a vacuum interrupter according to claim 1, characterized in that: The lower surface of the end cover (10) is fixedly connected to the upper surface of the sealing block (11), and the sealing block (11) is clamped in an inclined groove opened on the upper surface of the porcelain shell (1). The sealing block (11) is arranged in a ring shape.

3. A method for sealing a shield tube of a vacuum interrupter, characterized in that: A fixing structure for a vacuum interrupter shielding tube according to any one of claims 1 to 2 is used.

4. The method for sealing a shield tube of a vacuum interrupter according to claim 3, characterized in that: The following steps are involved: S1. First, when installing and fixing the shielding tube (2), the operator can insert the shielding tube (2) from the top of the porcelain shell (1) so that the shielding tube (2) is located inside the porcelain shell (1), and press the shielding tube (2) downward; S2. When the external thread (8) on the outer wall of the shielding cylinder (2) contacts the threaded cylinder (7), the operator can rotate the shielding cylinder (2) in the forward direction, so that the shielding cylinder (2) can move downward during the rotation, and the shielding cylinder (2) will drive the sealing gasket on the pressure plate (4) to move downward and fit tightly with the limiting ring (6), and at the same time, the annular pressure plate (4) will be stuck in the limiting groove (5) opened above the limiting ring (6); S3. When the shielding tube (2) moves downward, the rubber interlayer (9) slides on the outer wall of the shielding tube (2). When the pressure plate (4) cannot move downward, the inner wall of the rubber interlayer (9) is clamped in the sealing groove provided on the outer wall of the shielding tube (2). Then, the outer wall of the shielding tube (2) and the porcelain shell (1) are cast-welded to achieve fixed sealing of the shielding tube (2). S4. When sealing the shielding tube (2) in the porcelain shell (1) as a whole, first screw the end cover (10) so that the end cover (10) is threadedly connected to the inside of the porcelain shell (1) and the sealing block (11) is closely attached to the inclined groove opened above the porcelain shell (1). Then, the end cover (10) and the porcelain shell (1) are cast-welded to achieve sealing of the end cover (10); S5. When performing the last step of sealing, tighten the top cover (12) so that the top cover (12) penetrates into the thread groove (15) during the rotation process, so that the upper sealing ring (14) squeezes the lower sealing ring (14) during the downward movement. The sealing rings (14) that fit tightly together further improve the sealing effect. Then, the top cover (12) and the end cover (10) are cast-welded to achieve the overall sealing of the shielding tube (2).

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