Assembly shaft sleeve of vacuum arc-extinguishing chamber

Abstract

The utility model relates to the technical field of vacuum arc-extinguishing chambers, in particular to an assembly shaft sleeve of a vacuum arc-extinguishing chamber. Comprising an annular main body, an inner hole of the annular main body is provided with a positioning hole section used for being matched with a square column section of a moving contact rod so as to guarantee that the annular main body can be coaxially assembled on the moving contact rod, and the annular main body is further provided with a flange positioning face matched with the inner wall of a fixed flange in a positioning mode so as to be coaxially assembled with the fixed flange; the fixed flange and the assembly shaft sleeve which are coaxially assembled are sleeved on the moving contact rod, and due to the matching between the positioning hole section of the assembly shaft sleeve and the square column section of the moving contact rod, the coaxial assembly between the assembly shaft sleeve and the moving contact rod can be ensured, so that the coaxial assembly among the fixed flange, the assembly shaft sleeve and the moving contact rod is realized; the guide sleeve is ensured to be installed smoothly and has good coaxiality with the moving contact rod, and the moving contact rod is ensured to move stably in the guide sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum interrupters, and particularly relates to an assembly bushing for a vacuum interrupter. Background Art

[0002] A vacuum interrupter, also called a vacuum switch tube or a vacuum bulb, is a core device of a vacuum switch, and generally includes a moving contact rod, a guide sleeve, a moving cover plate, a fixed flange, a bellows, an end shield and a porcelain shell. The guide sleeve needs to be tightly sleeved on the moving contact rod to provide support and guidance for the moving contact rod.

[0003] In the prior art during the assembly process, first the bellows and the moving cover plate are sleeved on the moving contact rod, then the guide sleeve is also assembled on the moving contact rod through the fixed flange, and then the operator welds the moving cover plate, the fixed flange and the bellows, and then welds the bellows and the moving contact rod to complete the assembly.

[0004] As shown in Figures 1-3 , the guide sleeve includes a guide sleeve body 15, and the fixed flange for fixing the guide sleeve includes a flange cylinder 11. One end of the flange cylinder 11 is for the guide sleeve body 15 to extend into, and the other end of the flange cylinder has an inward flange 10. Four fin teeth 3 are arranged on the inward flange 10 and are used to match with four anti-twist grooves 8 of the guide sleeve. A guide sleeve convex key 9 is also arranged on the guide sleeve and is adapted to a square column section with a key groove on the moving contact, so as to realize anti-twist between the moving contact rod and the guide sleeve. However, during the specific installation, there is no relative positioning structure between the moving contact rod and the fixed flange, and generally the alignment is realized depending on the experience of the assembler. After the vacuum interrupter assembly welding is completed, if the relative position between the moving contact rod and the fixed flange deviates, it will cause the guide sleeve to be unable to be installed smoothly and the vacuum interrupter with the fixed flange already welded cannot be repaired, which will seriously affect the use of the vacuum interrupter. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an assembly bushing for a vacuum interrupter to solve the problem that in the prior art, during the assembly of the vacuum interrupter, the relative position between the moving contact rod and the fixed flange is prone to deviation, and it is difficult to ensure the coaxial assembly of the two, resulting in the guide sleeve being unable to be installed smoothly.

[0006] To achieve the above purpose, the technical solution of the assembly bushing for the vacuum interrupter provided by the utility model is: it includes an annular main body. The inner hole of the annular main body has a positioning hole section adapted to the square column section of the moving contact rod to ensure that the annular main body can be coaxially assembled on the moving contact rod. The annular main body also has a flange positioning surface for positioning and cooperating with the inner wall of the fixed flange to be coaxially assembled with the fixed flange.

[0007] As a further improvement, the annular body has an insertion end for inserting into the fixed flange, and the outer peripheral surface of the insertion end constitutes the flange positioning surface.

[0008] As a further improvement, the end face of the insertion end is in contact with the inward flange of the fixed flange, and an avoidance groove is provided thereon for avoiding the upward teeth on the inward flange of the fixed flange.

[0009] As a further improvement, a plug-in member is also provided on the end face of the insertion end for inserting into the opening of the moving cover plate and radially abutting against the opening edge of the moving cover plate.

[0010] As a further improvement, the plug-in members are a plurality of convex columns arranged on the end face of the insertion end, and the convex columns and the avoidance grooves are arranged at intervals.

[0011] As a further improvement, a positioning key is provided on the pore wall of the positioning hole section for positioning and cooperating with the key groove on the moving contact rod.

[0012] As a further improvement, an outer convex ring is provided on the outer edge of one end of the annular body away from the flange positioning surface.

[0013] The beneficial effects are as follows: The utility model provides a brand-new vacuum interrupter assembly bushing. During the assembly of the vacuum interrupter, first, the fixed flange of the fixed guide sleeve is sleeved outside the vacuum interrupter assembly bushing. Since the flange positioning surface of the annular body can be positioned and cooperated with the inner wall of the fixed flange, the coaxial assembly between the fixed flange and the assembly bushing can be ensured. Secondly, the assembled fixed flange and the assembly bushing are sleeved on the moving contact rod. The positioning hole section of the annular body of the assembly bushing is sleeved on the moving contact rod. Since the positioning hole section is adapted to the square column section of the moving contact rod, the coaxial assembly between the assembly bushing and the moving contact rod can be ensured, so that the fixed flange coaxial with the assembly bushing can be coaxially assembled on the moving contact rod. Then the operator performs welding, and the fixed flange can be coaxially fixed on the moving contact rod. Then the assembly bushing is taken out from the fixed flange, and the installation of the guide sleeve can be carried out to ensure the coaxial assembly between the guide sleeve and the moving contact rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the fixed flange used in the vacuum interrupter assembly process;

[0015] Figure 2 Top view of the guide sleeve used in the vacuum interrupter assembly process;

[0016] Figure 3 Side view of the guide sleeve used in the vacuum interrupter assembly process;

[0017] Figure 4 Front view of an embodiment of the vacuum interrupter assembly bushing provided by the utility model;

[0018] Figure 5 The bottom view of an embodiment of the vacuum interrupter assembly bushing provided by the present utility model;

[0019] Figure 6 The top view of an embodiment of the vacuum interrupter assembly bushing provided by the present utility model;

[0020] Figure 7 The assembly drawing of an embodiment of the vacuum interrupter assembly bushing provided by the present utility model;

[0021] In the figure: 1, square column section; 2, cylindrical section; 3, wing teeth; 4, avoidance groove; 5, convex key; 6, convex column; 7, outer convex ring; 8, anti-twist groove; 9, guide sleeve convex key; 10, inward flanging; 11, flange cylinder; 12, moving cover plate; 13, bellows; 14, round hole; 15, guide sleeve body. Specific embodiments

[0022] The features and performance of the present utility model will be further described in detail below in conjunction with embodiments.

[0023] A vacuum interrupter generally includes a moving contact rod, a guide sleeve, a moving cover plate, a fixed flange, a bellows, an end shield and a porcelain shell. Coaxiality is an important technical index for evaluating the form and position tolerance of a vacuum interrupter, and its coaxiality directly affects the fitting accuracy and service condition of the vacuum interrupter in the mechanism. Among them, the guide sleeve needs to be fixed on the fixed flange. Therefore, it is first necessary to ensure that the fixed flange is coaxially assembled on the moving contact rod. During the assembly process, the alignment is generally achieved by relying on the experience of the assembly personnel, and the assembly accuracy is poor. If there is a deviation in the relative position between the moving contact rod and the fixed flange, the guide sleeve cannot be installed smoothly and the fixed flange has been welded and fixed and cannot be repaired, which will seriously affect the use of the vacuum interrupter. Based on this, the present utility model provides a vacuum interrupter assembly bushing to solve the problems existing in the above-mentioned prior art.

[0024] The overall design concept of the vacuum interrupter assembly bushing provided by the present utility model is:

[0025] A vacuum interrupter assembly bushing includes an annular main body, and the annular main body has both a positioning hole section adapted to the square column section of the moving contact rod and a flange positioning surface for positioning and cooperating with the inner wall of the fixed flange.

[0026] Due to the cooperation between the fixed flange and the assembly bushing, coaxial assembly between the fixed flange and the assembly bushing can be achieved through the fit between the flange positioning surface and the fixed flange. Then, the coaxially assembled fixed flange and assembly bushing are sleeved together on the moving contact rod. Due to the fit between the positioning hole section of the assembly bushing and the square column section of the moving contact rod, coaxial assembly between the assembly bushing and the moving contact rod can be ensured. At this time, the fixed flange coaxial with the assembly bushing is naturally also coaxially assembled relative to the moving contact rod. After the operator welds and fixes the fixed flange to other components of the vacuum interrupter, the assembly bushing is simply removed from the fixed flange, and then the guide sleeve is installed into the fixed flange coaxial with the moving contact rod. Naturally, the guide sleeve can be smoothly installed and has good coaxiality with the moving contact rod, ensuring the smooth movement of the moving contact rod within the guide sleeve, helping to improve the operation accuracy, reduce friction and resistance, and effectively avoid situations such as friction or jamming between the moving contact rod and the guide sleeve during movement. Thereby, mechanical wear and the risk of failure can be reduced, and the operation reliability and service life can be improved.

[0027] Based on the above overall introduction of the vacuum interrupter assembly bushing of the present utility model, a more specific embodiment is provided on the basis of the overall introduction as follows:

[0028] This embodiment focuses on a detailed description of how to ensure the coaxial assembly accuracy between the fixed flange and the assembly bushing.

[0029] As Figures 1-7 shown, to further improve the assembly accuracy between the fixed flange and the assembly bushing, the annular main body has an insertion end for inserting into the fixed flange. The outer diameter of the insertion end is adapted to the inner diameter of the fixed flange. Thus, only by sleeving the fixed flange outside the insertion end, that is, sleeving the flange cylinder 11 outside the assembly bushing, coaxial assembly between the two can be achieved. The four fin teeth 3 on the fixed flange extend into the anti-twist groove 8 of the guide sleeve during assembly to achieve anti-twist. In this embodiment, an avoidance groove 4 is provided on the end face of the insertion end of the annular main body in the assembly bushing. After the annular main body inserts into the fixed flange, the fin teeth 3 of the fixed flange are exactly in the avoidance groove 4, so that the fixed flange can be more stably located on the assembly bushing, ensuring the coaxiality when the fixed flange and the assembly bushing are assembled. Then, the coaxially assembled fixed flange and assembly bushing can be sleeved on the moving contact rod to facilitate the overall assembly of the vacuum interrupter.

[0030] To facilitate the assembly bushing to be sleeved on the moving contact rod, improve the assembly speed, and at the same time prevent the coaxial assembly accuracy from being affected due to a slightly larger gap between the assembly bushing and the moving contact rod, a positioning key is provided on the hole wall of the positioning hole section for positioning and cooperating with the key groove on the moving contact rod so that the annular main body can be coaxially installed on the moving contact rod. In this embodiment, as Figures 4-7As shown, the positioning key includes at least a pair of convex keys 5 arranged oppositely. The ends of the convex keys 5 are flush with the ends of the positioning hole section. The opposite sides between the paired convex keys 5 are for the two ends of the driven contact rod to be inserted into the key grooves, so that the assembly bushing and the moving contact rod can be coaxially assembled. In other embodiments, two pairs of positioning keys can be arranged on the hole wall of the positioning hole section, specifically, a pair of convex keys can be arranged on the corresponding long side and the corresponding short side of the positioning hole section respectively.

[0031] As Figures 5-6 shown, the inner hole of the end face of the ring-shaped main body extending end is a round hole 14, and the plug-in part is arranged at the edge of the round hole 14. The avoidance groove 4 is arranged through the annular end face at one end of the ring-shaped main body, which is beneficial to the processing of the avoidance groove 4 and improves the manufacturing efficiency.

[0032] More specifically, as Figure 5 shown, an outer convex ring 7 is arranged on the outer edge of one end of the ring-shaped main body away from the flange positioning surface. As Figure 7 shown, when the assembly bushing and the fixed flange are assembled, the outer convex ring 7 can abut against the end of the middle flange cylinder 11 of the fixed flange, which is beneficial to the assembled fixed flange and the assembly bushing being sleeved on the moving contact rod. After the fixed flange is welded, the assembly bushing can be taken out from the fixed flange, and then the guide sleeve can be installed into the fixed flange.

[0033] Based on the above overall introduction of the vacuum interrupter assembly bushing of the present invention, a more specific embodiment is provided on the basis of the overall introduction:

[0034] This embodiment focuses on a detailed description of how to ensure the coaxial assembly accuracy among the moving cover plate, the fixed flange and the moving contact rod through the assembly bushing.

[0035] As Figures 1-7 shown, when the vacuum interrupter is assembled, first, the bellows 13 and the moving cover plate 12 are sleeved on the moving contact rod, and then the above-mentioned fixed flange and the assembly bushing that have achieved coaxial assembly are sleeved on the moving contact rod. Since a plug-in part is also arranged on the end face of the extending end of the ring-shaped main body extending into the fixed flange, when the fixed flange and the assembly bushing that have been coaxially assembled are sleeved on the moving contact rod, the plug-in part on the assembly bushing extends into the opening of the moving cover plate 12 and abuts against the opening edge of the moving cover plate 12, thereby realizing the coaxial assembly between the moving cover plate 12 and the assembly bushing, and naturally ensuring the coaxial assembly among the fixed flange coaxial with the assembly bushing, the moving contact rod and the moving cover plate. Therefore, through the assembly bushing provided by the present invention, on the basis of enabling the fixed flange and the moving contact rod to achieve coaxial assembly, it can ensure that the moving cover plate, the fixed flange and the moving contact rod achieve coaxial assembly.

[0036] In this embodiment, the plug-in part is a convex column 6 fixed on the end face of the insertion end. There are multiple convex columns 6, which are arranged to abut against the edge of the moving cover plate opening along the circumferential direction of the moving cover plate opening. As Figure 4 , 5 , 7 shows that a more preferred embodiment is to provide four convex columns 6 that are arranged in pairs opposite to each other, and the four convex columns 6 are arranged at intervals from the above-mentioned four avoidance grooves 4. Or, since the wing teeth 3 on the fixed flange are arranged near the circumferential edge, correspondingly, the avoidance grooves 4 are arranged near the radially outer side of the end face of the insertion end, and a plurality of plug-in columns arranged along the end of the assembly bushing are circumferentially arranged along the edge of the inner hole of the annular body.

[0037] In other embodiments, the inner hole diameter of the end face of the assembly bushing where the plug-in part is provided is matched with the diameter of the moving cover plate opening. At this time, a retaining ring extending along the annular body is provided in a circle along the edge of the inner hole of the annular body. The retaining ring serves as the plug-in part. During assembly, the retaining ring extends into the opening of the moving cover plate, and the retaining ring can fit with the opening to achieve coaxial assembly between the assembly bushing and the moving cover plate. Or the plug-in part can also be a wedge-shaped convex block provided on the end face of the annular body, specifically a convex column with an inclined surface. When the assembled assembly bushing and the fixed flange are integrally sleeved on the moving contact rod, the inclined surface of the wedge-shaped convex block gradually snaps into the opening of the moving cover plate along the assembly direction, making it easy for the assembly bushing to be aligned and assembled with the moving cover plate. Usually, two wedge-shaped convex blocks can be arranged oppositely, or four wedge-shaped convex blocks can be evenly arranged on the end face of the assembly bushing.

[0038] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention does not separately describe various possible combination methods.

[0039] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

[0040] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. Any equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A vacuum interrupter assembly sleeve, characterized in that: It includes an annular body, the inner hole of which has a positioning hole section adapted to the square column section of the moving contact rod to ensure that the annular body can be coaxially assembled on the moving contact rod. The annular body also has a flange positioning surface positioned and matched with the inner wall of the fixed flange for coaxial assembly with the fixed flange.

2. The vacuum interrupter assembly sleeve according to claim 1 is characterized in that: The annular body has an insertion end for inserting into the fixed flange, and the outer peripheral surface of the insertion end constitutes the flange positioning surface.

3. The vacuum interrupter assembly sleeve according to claim 2 is characterized in that: The end surface of the extending end is fitted with the inner flange of the fixing flange, and is provided with an avoidance groove for avoiding the wing teeth on the inner flange of the fixing flange.

4. The vacuum interrupter assembly sleeve according to claim 3 is characterized in that: A plug-in connector is also arranged on the end surface of the extending end, which is used to extend into the opening of the moving cover plate and radially abut against the opening edge of the moving cover plate.

5. The vacuum interrupter assembly sleeve according to claim 4 is characterized in that: The plug-in connector is a plurality of convex columns arranged on the end surface of the insertion end, and the convex columns are arranged at intervals from the avoidance grooves.

6. The vacuum interrupter assembly sleeve according to any one of claims 1 to 5, characterized in that: A positioning key is arranged on the hole wall of the positioning hole section for positioning and matching with the key slot on the moving contact rod.

7. The vacuum interrupter assembly sleeve according to any one of claims 1 to 5, characterized in that: An outer convex ring is arranged on the outer edge of one end of the annular body away from the flange positioning surface.

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