A small vacuum arc-extinguishing chamber for low voltage circuit breakers

Abstract

The utility model discloses a small -size vacuum arc extinguish chamber of low voltage circuit breaker relates to vacuum circuit breaker technical field, including: vacuum arc extinguish chamber subassembly, two sets of assembly connecting mechanism, two sets of assembly connecting mechanism are used for the assembly fixed of vacuum arc extinguish chamber subassembly to two sets of glue injection reinforcing mechanism, any one set of glue injection reinforcing mechanism all includes the annular inner glue injection groove of setting up in the adjacent annular department outside and the annular outer glue injection groove of setting up in the inside end of insulating porcelain pipe, the annular inner glue injection groove and adjacent annular outer glue injection groove are in line and set up, the utility model discloses simple structure, and the assembly difficulty is low, and the production cost is reduced, and the friction provided by press -fitting plug -in and annular piece after forming can guarantee enough connecting strength, be applicable to the production of small -size vacuum arc extinguish chamber, help to promote the miniaturization and modularization of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of vacuum circuit breaker technology, and in particular to a small vacuum interrupter for a low-voltage circuit breaker. Background Technology

[0002] A vacuum circuit breaker is a type of vacuum power switch, and the vacuum interrupter is the core component of a vacuum circuit breaker. The main function of the vacuum interrupter is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off by the excellent insulation of the vacuum inside the tube, thus preventing accidents and incidents.

[0003] A search revealed that the utility model patent with authorization announcement number CN221651393U discloses a vacuum circuit breaker arc-extinguishing chamber, which forms a three-layer sealing structure inside the arc-extinguishing chamber, thereby ensuring the airtightness of the arc-extinguishing chamber and avoiding air leakage that could cause safety hazards.

[0004] However, when the above-mentioned vacuum circuit breaker interrupter chamber is actually assembled, multiple components need to be combined first, and then multiple nuts are tightened on the outside of multiple screws to achieve assembly. The structure is too complicated, and the assembly process is cumbersome and time-consuming. Especially when applied to small vacuum interrupters, the thin screws cannot guarantee sufficient connection strength due to volume limitations.

[0005] Therefore, it is necessary to invent a small vacuum interrupter for low-voltage circuit breakers to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a small vacuum interrupter for low-voltage circuit breakers. It has a simple structure, is easy to assemble, and reduces production costs. The friction provided by the press-fit connection and the formed ring part can ensure sufficient connection strength. It is suitable for the production of small vacuum interrupters and helps to promote the miniaturization and modularization of circuit breakers. This solves the problem mentioned in the background art that the existing vacuum interrupter structure is too complex and the assembly process is cumbersome and time-consuming. Especially when applied to small vacuum interrupters, the excessively thin screw cannot guarantee sufficient connection strength due to volume limitations.

[0007] According to one aspect of this disclosure, the following technical solution is provided: a miniature vacuum interrupter for a low-voltage circuit breaker, comprising: Vacuum interrupter assembly; Two sets of assembly and connection mechanisms are used for assembling and fixing the vacuum interrupter assembly; and The two sets of glue injection reinforcement mechanisms each include an inner annular glue injection groove located outside the adjacent annular portion and an outer annular glue injection groove located at the inner end of the insulating ceramic tube. The inner annular glue injection groove and the adjacent outer annular glue injection groove are arranged colinearly. The glue injection reinforcement mechanism also includes a glue inlet channel and a glue outlet channel located on both sides of the insulating ceramic tube and connected to the adjacent outer annular glue injection groove.

[0008] According to at least one embodiment of the present disclosure, a small vacuum interrupter for a low-voltage circuit breaker includes an insulating porcelain tube with a plurality of annular heat dissipation grooves evenly distributed on the outer side of the insulating porcelain tube and a shielding cover disposed on the inner side of the insulating porcelain tube.

[0009] According to at least one embodiment of the present disclosure, a small vacuum interrupter for a low-voltage circuit breaker has an upper end cover fixedly connected to one end of the insulating porcelain tube by friction, and a lower end cover fixedly connected to the other end of the insulating porcelain tube by friction. The two sets of assembly and connection mechanisms are respectively fixedly disposed inside the upper end cover and the lower end cover.

[0010] According to at least one embodiment of the present disclosure, a small vacuum interrupter for a low-voltage circuit breaker has a movable conductive rod slidably disposed on the inner side of the upper end cover, and a stationary conductive rod fixedly disposed in the middle of the inner side of the lower end cover.

[0011] According to at least one embodiment of the low-voltage circuit breaker miniature vacuum interrupter, any one set of the assembly connection mechanism includes an annular portion, one annular portion is fixedly connected to the upper end cover, and the other annular portion is fixedly connected to the lower end cover. The inner end of the annular portion is provided with a slot adapted to the end of the shield.

[0012] According to at least one embodiment of the present disclosure, a small vacuum interrupter for a low-voltage circuit breaker has a first receiving groove and a second receiving groove sequentially opened from the outside to the inside of the annular portion, and a sealing ring is nested inside both the first receiving groove and the second receiving groove.

[0013] The technical effects and advantages of this utility model are as follows: This invention incorporates a glue-injection reinforcement mechanism. First, a press-fitting device is used to press the lower end cap, causing its inner annular portion to insert into the inner side of the insulating ceramic tube for fixation. Then, a shielding cover is inserted into the slot at the end of the inner annular portion of the lower end cap. Next, the upper end cap is pressed in a vacuum chamber, causing its inner annular portion to insert into the inner side of the insulating ceramic tube for fixation. At this point, the inner annular glue-injection groove and the adjacent outer annular glue-injection groove are collinear. Glue is then injected through the glue-inlet channel into the space formed by the inner and outer annular glue-injection grooves. Adhesive is injected into the sealing and reinforcing chamber until it is discharged from the outlet channel. Finally, the excess adhesive discharged from the outlet channel is cleaned up. After the adhesive solidifies, the inner and outer annular injection grooves form an annular component to enhance sealing and connection strength. Compared with the prior art, this utility model has a simple structure, low assembly difficulty, and reduced production costs. The friction provided by the press-fit connection and the formed annular component can ensure sufficient connection strength. It is suitable for the production of small vacuum interrupters and helps to promote the miniaturization and modularization of circuit breakers. Attached Figure Description

[0014] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0015] Figure 1 This is a schematic diagram of the overall structure of a small vacuum interrupter for a low-voltage circuit breaker according to one embodiment of the present disclosure.

[0016] Figure 2 This is a partial structural diagram of the vacuum interrupter assembly, assembly connection mechanism, and glue injection reinforcement mechanism of a miniature vacuum interrupter for a low-voltage circuit breaker according to one embodiment of the present disclosure.

[0017] Figure 3 This is a partial structural schematic diagram of the glue injection reinforcement mechanism of a small vacuum interrupter for a low-voltage circuit breaker according to one embodiment of the present disclosure.

[0018] The specific labels in the attached figures are as follows: Vacuum interrupter assembly; 11. Insulating ceramic tube; 12. Shielding cover; 13. Upper end cover; 14. Lower end cover; 15. Moving conductive rod; 16. Static conductive rod; 17. Annular heat dissipation groove; Assembly and connection mechanism; 21. Annular part; 22. First receiving groove; 23. Second receiving groove; 24. Sealing ring; Glue injection reinforcement mechanism; 31. Annular inner glue injection groove; 32. Annular outer glue injection groove; 33. Glue inlet channel; 34. Glue outlet channel. Detailed Implementation

[0019] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., as in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” other components or features would subsequently be positioned “above” said other components or features. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0020] Figure 1 This is a schematic diagram of the overall structure of a small vacuum interrupter for a low-voltage circuit breaker according to one embodiment of the present disclosure.

[0021] Figure 2 This is a partial structural diagram of the vacuum interrupter assembly 1, the assembly and connection mechanism 2, and the glue injection and reinforcement mechanism 3 of a miniature vacuum interrupter for a low-voltage circuit breaker according to one embodiment of the present disclosure.

[0022] Figure 3 This is a partial structural schematic diagram of the glue injection reinforcement mechanism 3 of a small vacuum interrupter of a low-voltage circuit breaker according to one embodiment of the present disclosure.

[0023] like Figures 1-3 As shown, the miniature vacuum interrupter of the low-voltage circuit breaker disclosed herein may include: a vacuum interrupter assembly 1, two sets of assembly and connection mechanisms 2, and two sets of glue injection reinforcement mechanisms 3, etc.

[0024] like Figure 2 As shown in this disclosure, the vacuum interrupter assembly 1 includes an insulating ceramic tube 11. Multiple annular heat dissipation grooves 17 are evenly distributed on the outer side of the insulating ceramic tube 11. A shielding cover 12 is provided on the inner side of the insulating ceramic tube 11. An upper end cover 13 is fixedly inserted to one end of the insulating ceramic tube 11 by friction, and a lower end cover 14 is fixedly inserted to the other end of the insulating ceramic tube 11 by friction. Two sets of assembly and connection mechanisms 2 are respectively fixedly disposed on the inner side of the upper end cover 13 and the lower end cover 14. A movable conductive rod 15 is slidably disposed on the inner side of the upper end cover 13, and a stationary conductive rod 16 is fixedly disposed in the middle of the inner side of the lower end cover 14.

[0025] It should be noted that the vacuum interrupter assembly 1 is a technology already disclosed in the prior art and is not a necessary technical feature of this application. Therefore, its working process will not be described in detail here.

[0026] like Figure 2 As shown, in a preferred embodiment, any set of assembly and connection mechanisms 2 includes an annular portion 21. One annular portion 21 is fixedly connected to the upper end cover 13, and the other annular portion 21 is fixedly connected to the lower end cover 14. The inner end of the annular portion 21 is provided with a slot that is adapted to the end of the shielding cover 12. The outer side of the annular portion 21 is provided with a first receiving groove 22 and a second receiving groove 23 from the outside to the inside. Both the first receiving groove 22 and the second receiving groove 23 are nested with sealing rings 24.

[0027] Therefore, when the annular portion 21 is pressed into the inner side of the insulating ceramic tube 11, the annular portion 21 is fixed inside the insulating ceramic tube 11 due to friction. At the same time, the annular portion 21 drives the two second receiving grooves 23 to enter the insulating ceramic tube 11 simultaneously through the first receiving groove 22 and the second receiving groove 23. Thus, while sealing the opening of the insulating ceramic tube 11, a seal is formed on both sides of the glue injection groove 31 inside the annulus, so as to prevent the adhesive from entering the interior of the insulating ceramic tube 11 during subsequent glue injection.

[0028] like Figure 2 and Figure 3 As shown in this disclosure, any set of glue injection reinforcement mechanisms 3 includes an inner annular glue injection groove 31 opened outside the adjacent annular portion 21 and an outer annular glue injection groove 32 opened at the inner end of the insulating ceramic tube 11. The inner annular glue injection groove 31 and the adjacent outer annular glue injection groove 32 are arranged colinearly. The glue injection reinforcement mechanism 3 also includes a glue inlet channel 33 and a glue outlet channel 34 respectively opened on both sides of the insulating ceramic tube 11 and both connected to the adjacent outer annular glue injection groove 32.

[0029] Therefore, the lower end cap 14 is first pressed using a press-fitting device, so that the lower end cap 14 drives its inner annular portion 21 to be inserted into the inner side of the insulating ceramic tube 11 for fixation. Then, the shielding cover 12 is inserted into the slot at the end of the inner annular portion 21 of the lower end cap 14. Then, the upper end cap 13 is pressed in the vacuum chamber, so that the upper end cap 13 drives its inner annular portion 21 to be inserted into the inner side of the insulating ceramic tube 11 for fixation. At this time, the inner annular injection groove 31 and the adjacent outer annular injection groove 32 are collinear. At this time, the glue is injected into the inner annular injection groove 31 and the outer annular injection groove 32 through the glue inlet channel 33. Adhesive is injected into the sealed and reinforced cavity formed by the glue tank 32 until it is discharged from the glue outlet channel 34. Finally, the excess adhesive discharged from the glue outlet channel 34 is cleaned up. After the adhesive solidifies, the inner annular glue injection tank 31 and the outer annular glue injection tank 32 form an annular part to enhance the sealing performance and connection strength. Compared with the prior art, the structure is simple, the assembly difficulty is low, and the production cost is reduced. The friction provided by the press-fit and the formed annular part can ensure sufficient connection strength. It is suitable for the production of small vacuum interrupters and helps to promote the miniaturization and modularization of circuit breakers.

[0030] It should also be noted that any content not described in detail in this specification is prior art known to those skilled in the art.

[0031] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A miniature vacuum interrupter for a low-voltage circuit breaker, characterized in that, include: Vacuum interrupter assembly; Two sets of assembly and connection mechanisms are used for assembling and fixing the vacuum interrupter assembly; and The two sets of glue injection reinforcement mechanisms each include an inner annular glue injection groove located outside the adjacent annular portion and an outer annular glue injection groove located at the inner end of the insulating ceramic tube. The inner annular glue injection groove and the adjacent outer annular glue injection groove are arranged colinearly. The glue injection reinforcement mechanism also includes a glue inlet channel and a glue outlet channel located on both sides of the insulating ceramic tube and connected to the adjacent outer annular glue injection groove.

2. The miniature vacuum interrupter for low-voltage circuit breakers according to claim 1, characterized in that: The vacuum interrupter assembly includes an insulating ceramic tube, on the outside of which multiple annular heat dissipation grooves are evenly distributed, and on the inside of which a shielding cover is provided.

3. The miniature vacuum interrupter for low-voltage circuit breakers according to claim 2, characterized in that: One end of the insulating ceramic tube is fixed to the upper end cap by frictional insertion, and the other end of the insulating ceramic tube is fixed to the lower end cap by frictional insertion. The two sets of assembly and connection mechanisms are respectively fixed inside the upper end cap and the lower end cap.

4. The miniature vacuum interrupter for low-voltage circuit breakers according to claim 3, characterized in that: A movable conductive rod is slidably disposed on the inner side of the upper end cover, and a stationary conductive rod is fixedly disposed in the middle of the inner side of the lower end cover.

5. The miniature vacuum interrupter for low-voltage circuit breakers according to claim 4, characterized in that: Each of the assembly and connection mechanisms includes an annular portion, one annular portion is fixedly connected to the upper end cover, and the other annular portion is fixedly connected to the lower end cover. The inner end of the annular portion is provided with a slot that is adapted to the end of the shielding cover.

6. The miniature vacuum interrupter for low-voltage circuit breakers according to claim 5, characterized in that: The outer side of the annular portion is provided with a first receiving groove and a second receiving groove from the outside to the inside, and a sealing ring is nested inside the first receiving groove and the second receiving groove.

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