Guide sleeve for vacuum arc-extinguishing chamber

Abstract

The utility model discloses a guide sleeve for a vacuum arc-extinguishing chamber, which comprises a body provided with an axial sleeve hole, and the body comprises a pipe body part and an annular convex part arranged on the peripheral side of the pipe body part in a surrounding manner; an annular groove and a convex ring part positioned on the outer side of the annular groove part are arranged at the upper part of the annular convex part; a plurality of positioning notches evenly distributed in the circumferential direction are formed in the inner side of the convex ring part, the upper ends and the inner sides of the positioning notches are of opening structures communicating with the annular groove, and the outer sides of the positioning notches are of sealing structures with outer side walls. According to the guide sleeve for the vacuum arc-extinguishing chamber, through structural optimization, the deformation resistance of the guide sleeve can be improved, and the use performance of a product is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum interrupter technology, specifically relating to a guide sleeve for a vacuum interrupter. Background Technology

[0002] As a core component of high-voltage switchgear, the vacuum interrupter plays a crucial role in rapidly extinguishing arcs and interrupting fault currents during short-circuit faults or overloads in power systems. Its performance directly affects the safe and stable operation of the power system. Within this device, the guide sleeve serves as a guide and limiter for the movement trajectory of the conductive rod on the moving contact. The rationality of its structure has a decisive impact on the opening and closing accuracy, mechanical lifespan, and arc control capability of the interrupter.

[0003] Currently, most guide sleeves used in the industry are integral structures made of plastic injection molding. During assembly with the fixed plate, the positioning groove on the guide sleeve and the positioning piece on the fixed plate interlock to achieve circumferential positioning between them. In the design of plastic guide sleeves, the positioning groove typically adopts a fully open slotted structure at the top and both the inner and outer sides. While this structure facilitates assembly and positioning, it has drawbacks: the fully open positioning groove affects the strength of the annular protrusion, and the high-temperature arc during the arc extinguishing process can easily cause localized overheating and deformation of the guide sleeve, thus affecting the product's performance. Utility Model Content

[0004] The purpose of this invention is to provide a guide sleeve for a vacuum interrupter, which improves its strength and reduces the risk of thermal deformation through structural optimization.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides a guide sleeve for a vacuum interrupter, comprising a body with an axial sleeve hole, the body including a tube portion and an annular protrusion surrounding the outer periphery of the tube portion; the annular protrusion has an annular groove on its upper part and a convex ring portion located outside the annular groove portion; the inner side of the convex ring portion has a plurality of positioning slots evenly distributed circumferentially, the upper end and inner side of the positioning slots are open structures communicating with the annular groove, and the outer side of the positioning slots is a sealed structure with an outer sidewall.

[0007] Preferably, a stress groove is provided on the inner wall of the convex ring between two adjacent positioning slots.

[0008] Preferably, the stress groove is an arc-shaped groove.

[0009] Preferably, the annular protrusion is provided with a vent hole that extends through the axial direction.

[0010] Preferably, the bottom end of the positioning groove extends downward to below the bottom surface of the annular groove.

[0011] Preferably, the number of positioning slots is three to five.

[0012] Preferably, the inner wall of the axial sleeve hole is provided with a guide strip or guide groove extending axially.

[0013] Preferably, the cross-section of the axial sleeve hole is a closed annular structure with at least one straight side.

[0014] Preferably, the lower edge of the annular protrusion is provided with positioning slots evenly distributed circumferentially.

[0015] Preferably, the thickness of the outer wall is no more than 2 mm.

[0016] The positive effects of this utility model are as follows: The guide sleeve structure for the vacuum interrupter in this utility model is improved by using an open structure on the positioning slot to allow the positioning piece on the fixed plate to be inserted during installation and use. The positioning piece and the positioning slot are engaged to prevent the fixed plate from rotating relative to the guide sleeve. Furthermore, by setting the outer side of the positioning slot to be a closed structure, the presence of the outer sidewall can strengthen the strength of the positioning slot, thereby enhancing the overall strength of the annular protrusion and reducing the risk of deformation of the annular protrusion during the production and heating of the guide sleeve, thus improving the performance of the guide sleeve. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. Similar elements or parts in the drawings are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a top view of the first type of guide sleeve in this utility model;

[0019] Figure 2 for Figure 1 A perspective view of the guide sleeve shown in the figure;

[0020] Figure 3 This is a perspective view of the second type of guide sleeve in this utility model;

[0021] Figure 4 This is a top view of the third type of guide sleeve in this utility model.

[0022] The reference numerals in the figure are as follows: 10, axial sleeve hole; 101, guide strip; 1, body; 11, tube body; 12, annular protrusion; 121, annular groove; 122, convex ring; 123, positioning groove; 124, outer wall; 125, stress groove; 126, vent hole; 127, positioning bayonet. Detailed Implementation

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0025] The guide sleeve structure for the vacuum interrupter in this embodiment of the utility model is as follows: Figure 1 and Figure 2 As shown, it includes a body 1 with an axial sleeve hole 10, which is integrally injection molded. The axial sleeve hole 10 is used for the conductive rod on the vacuum interrupter to pass through. The body 1 includes a tube portion 11 and an annular protrusion 12 surrounding the outer periphery of the tube portion 11. The annular protrusion 12 has an annular groove 121 on its upper part and a convex ring portion 122 located outside the annular groove 121. The inner side of the convex ring portion 122 has four positioning slots 123 evenly distributed circumferentially. In actual operation, the positioning slots 123 can also be set to three or five. The upper end and inner side of the positioning slots 123 are connected to the annular groove. The positioning slot 123 has a connected open structure, and the outer side of the positioning slot 123 is a closed structure with an outer sidewall 124. In this design, the open structure on the positioning slot 12 allows for insertion of the positioning piece on the fixed plate during installation. The positioning piece and the positioning slot 12 are engaged to prevent the fixed plate from rotating relative to the guide sleeve. By setting the outer side of the positioning slot 123 to be a closed structure, the presence of the outer sidewall 124 can strengthen the strength of the positioning slot 12, thereby enhancing the overall strength of the annular protrusion 12, reducing the risk of deformation of the annular protrusion 12 during the production and heating of the guide sleeve, and thus improving the performance of the guide sleeve.

[0026] Preferably, the thickness of the outer sidewall 124 is set to be no more than 2mm. For example, the thickness of the outer sidewall 124 can be set to 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, etc. By controlling the outer sidewall 124 within 2mm, the outer sidewall 124 plays a reinforcing role and also avoids the outer sidewall 124 from encroaching on the position of the positioning slot 12 when the thickness is large, thus ensuring the size of the positioning slot 12 and facilitating the insertion of the positioning slot 12 with the positioning piece on the positioning plate.

[0027] Continue reading Figure 1 and Figure 2The inner wall of the convex ring 122 is provided with a stress groove 125 between two adjacent positioning slots 123. During production and molding, the stress can be released through the stress groove 125, thereby reducing the risk of deformation of the guide sleeve. Preferably, the stress groove 125 is an arc-shaped groove with the groove opening facing the axis of the guide sleeve.

[0028] In order to dissipate the heat in the vacuum interrupter in a timely manner, a vent hole 126 is provided on the annular protrusion 12, which is axially penetrating. The vent hole 126 can connect the inside of the vacuum interrupter with the outside, thereby playing a role in ventilation and heat dissipation. There are multiple vent holes 126, and it is preferred that multiple vent holes 126 are evenly distributed in the circumferential direction.

[0029] Furthermore, the bottom end of the positioning slot 123 extends downward to a depth lower than the bottom surface of the annular groove 121, thereby increasing the axial depth of the positioning slot 123 and facilitating its engagement with the positioning piece on the fixed plate.

[0030] See Figure 1 and Figure 2 The axial sleeve hole 10 has an axially extending guide strip 101 on its inner wall. By providing the guide strip 101, it can engage with the axial groove on the side wall of the conductive rod, thereby creating a circumferential limit between the guide sleeve and the conductive rod, and allowing the conductive rod to move axially relative to the guide sleeve. As a variation, in actual operation, an axially extending guide groove can also be provided on the inner wall of the axial sleeve hole 10 to engage with the axial strip on the conductive rod. In another embodiment, such as... Figure 4 As shown, the cross-section of the axial sleeve hole 10 is a closed annular structure with at least one straight side, and the cross-sectional shape of the corresponding part on the conductive rod that is adapted to it matches the cross-sectional shape of the axial sleeve hole 10.

[0031] See Figure 3 In another embodiment, positioning slots 127 are evenly distributed along the circumferential direction on the lower edge of the annular protrusion 12. When the fixed plate and the guide sleeve are assembled, after the fixed plate is put on the guide sleeve, the position on the fixed plate corresponding to the positioning slot 127 is riveted and deformed to form a snap-fit ​​with the positioning slot 127, thereby enhancing the reliability of the connection between the fixed plate and the guide sleeve.

[0032] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the scope of protection of this invention.

Claims

1. A guide sleeve for a vacuum interrupter, comprising a body (1) having an axial sleeve hole (10), the body (1) comprising a tube portion (11) and an annular protrusion (12) surrounding the outer periphery of the tube portion (11); the annular protrusion (12) having an annular groove (121) on its upper part and a protruding ring portion (122) located outside the annular groove (121); characterized in that, The inner side of the convex ring (122) is provided with a plurality of positioning slots (123) evenly distributed along the circumference. The upper end and inner side of the positioning slot (123) are open structures communicating with the annular groove (121), and the outer side of the positioning slot (123) is a sealed structure with an outer sidewall (124).

2. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The inner wall of the convex ring (122) is provided with stress grooves (125) between two adjacent positioning slots (123).

3. The guide sleeve for a vacuum interrupter according to claim 2, characterized in that, The stress groove (125) is an arc-shaped groove.

4. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The annular protrusion (12) is provided with a vent (126) that runs through the axial direction.

5. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The bottom end of the positioning groove (123) extends downward to a depth lower than the bottom surface of the annular groove (121).

6. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The number of the positioning slots (123) is three to five.

7. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The inner wall of the axial sleeve hole (10) is provided with a guide strip (101) or guide groove extending along the axial direction.

8. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The cross-section of the axial sleeve (10) is a closed annular structure with at least one straight side.

9. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The lower edge of the annular protrusion (12) is provided with positioning slots (127) evenly distributed along the circumference.

10. The guide sleeve for a vacuum interrupter according to claim 1, characterized in that, The thickness of the outer wall (124) is no greater than 2 mm.

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