Spring pre-tightening self-resetting same-circle supporting inner guide structure

Abstract

The invention discloses a spring pre-tightening self-resetting concentric support inner guide structure which comprises a guide shaft, a guide sleeve and a plurality of guide shaft insert keys. One end of each guide shaft insert key is fixed on the peripheral surface of the guide shaft, the other end of each guide shaft insert key is connected with the side surface of the guide sleeve through a first elastic reset mechanism, a key gap is arranged between every two adjacent guide shaft insert keys, a guide sleeve insert key is arranged in each key gap, one end of each guide sleeve insert key is fixed on the side wall of the guide sleeve, and the other end of each guide sleeve insert key is connected with the guide sleeve through a second elastic reset mechanism. The other end of the guide sleeve inserting key is connected with the peripheral face of the guide shaft through a second elastic reset mechanism, the structure can provide internal and active reset separation capacity, and stable and effective full-stroke radial support is provided for the long-stroke corrugated pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of vacuum switchgear and relates to a spring preloaded self-resetting circular support inner guide structure. Background Technology

[0002] Vacuum interrupters are key switching components in medium- and high-voltage power systems, and their core function relies on the reliable opening and closing of internal moving and stationary contacts under high vacuum conditions. In this process, the metal bellows, as the core flexible component connecting the external operating mechanism and the internal moving contact, not only undertakes the dynamic function of transmitting motion, but also shoulders the static sealing mission of maintaining the long-term vacuum level of the chamber; its structural integrity is of paramount importance.

[0003] As transmission voltage levels increase, the overall size and internal insulation gap of vacuum interrupters correspondingly increase, requiring metal bellows to have longer structures and greater travel. However, bellows are a typical thin-walled flexible structure, and increasing their length leads to a sharp decrease in their radial stiffness. In the working environment, the bellows constantly bears a huge pressure difference between the external atmospheric pressure and the internal high vacuum. When a tripping operation is performed, the bellows is axially compressed, and this long and flexible tube structure is highly susceptible to radial bulging or torsional deformation due to pressure instability.

[0004] To overcome this problem, the industry has proposed setting up a telescopic internal guiding system inside the bellows, consisting of a guide shaft and a guide sleeve. However, existing solutions (such as Chinese patent CN105513885B) disclose an internal guiding structure, including a guide shaft and a guide sleeve extending forward and backward. The outer circumferential surface of the guide shaft is provided with a guide groove extending backward from the front end of the guide shaft. The guide sleeve is provided with a guide key that cooperates with the guide groove in the forward and backward guiding direction. The outer side of the guide key is located on the same circumferential surface as the outer circumferential surface of the guide shaft and is used to support the inner wall of the bellows. The guiding movement stroke of the guide shaft and the guide sleeve is greater than the telescopic stroke of the bellows. A bellows assembly includes a bellows and an inner guide structure disposed within the bellows. The inner guide structure includes a guide shaft extending forward and backward and a guide sleeve. A guide groove extending rearward from the front end of the guide shaft is provided on the outer circumferential surface of the guide shaft. A guide key is provided on the guide sleeve, which guides the guide groove in a forward-backward direction. The outer surface of the guide key is on the same circumferential surface as the outer circumferential surface of the guide shaft and contacts the inner wall of the bellows. The guiding travel of the guide shaft and guide sleeve is greater than the extension / retraction travel of the bellows. A vacuum interrupter includes a bellows assembly disposed within the interrupter chamber. The bellows assembly includes a bellows and an inner guide structure disposed within the bellows. The inner guide structure includes a guide shaft extending forward and backward and a guide sleeve. A guide groove extending rearward from the front end of the guide shaft is provided on the outer circumferential surface of the guide shaft. A guide key is provided on the guide sleeve, which guides the guide groove in a forward-backward direction. The outer surface of the guide key is on the same circumferential surface as the outer circumferential surface of the guide shaft and supports the inner wall of the bellows. The guiding travel of the guide shaft and guide sleeve is greater than the extension / retraction travel of the bellows.

[0005] Under the combined effects of vacuum, friction, and immense external pressure, this design generates significant resistance between the interlocking guide components. The bellows' own weak restoring force is often insufficient to reliably overcome this resistance, leading to incomplete separation, delayed action, or even complete jamming, posing a significant reliability risk. Therefore, existing technologies lack an effective means to endow telescopic guide structures with inherent, active reset and separation capabilities. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a spring preloaded self-resetting circular support inner guide structure. This structure can provide an inherent, active reset and separation capability, providing stable and effective full-stroke radial support for long-stroke bellows.

[0007] To achieve the above objectives, the present invention discloses a spring-preloaded self-resetting circular support inner guide structure, comprising a guide shaft, a guide sleeve, and several guide shaft keys; one end of each guide shaft key is fixed to the outer circumferential surface of the guide shaft, and the other end of each guide shaft key is connected to the side of the guide sleeve through a first elastic reset mechanism; a key gap is provided between adjacent guide shaft keys, and a guide sleeve key is provided within the key gap; one end of the guide sleeve key is fixed to the side wall of the guide sleeve, and the other end of the guide sleeve key is connected to the outer circumferential surface of the guide shaft through a second elastic reset mechanism.

[0008] Furthermore, the guide shaft has a cylindrical structure.

[0009] Furthermore, the keyways of each guide shaft are evenly distributed along the circumference.

[0010] Furthermore, the keyways of each guide shaft and the keyways of the guide sleeve are arranged alternately along the circumferential direction.

[0011] Furthermore, the radius corresponding to the outer arc surface of the guide shaft key is the same as the radius corresponding to the outer arc surface of the guide sleeve key.

[0012] Furthermore, when the guide shaft key and the guide sleeve key move in an alternating manner, the outer surfaces of all the guide shaft keys and guide sleeve keys together form a continuous, smooth circular support surface.

[0013] Furthermore, both the first elastic reset mechanism and the second elastic reset mechanism are compression springs.

[0014] Furthermore, spring seats for connecting compression springs are provided on the end face of the guide shaft key, the end face of the guide sleeve key, the outer circumferential surface of the guide shaft, and the side surface of the guide sleeve.

[0015] Furthermore, the compression spring is a disc spring assembly or a wave spring.

[0016] Furthermore, the guide sleeve key and guide shaft key are rectangular or trapezoidal structures. The present invention has the following beneficial effects: In specific operation, the spring preloaded self-resetting circular support inner guide structure of the present invention has one end of each guide shaft key fixed to the outer circumferential surface of the guide shaft, and the other end of each guide shaft key connected to the side of the guide sleeve through a first elastic reset mechanism. One end of the guide sleeve key is fixed to the side wall of the guide sleeve, and the other end of the guide sleeve key is connected to the outer circumferential surface of the guide shaft through a second elastic reset mechanism. When the bellows is compressed, the relative movement of the two ends of the bellows forces the guide shaft and the guide sleeve closer together. During this process, the external force overcomes the elastic force of the first and second elastic reset mechanisms, and the first elastic reset mechanism... The first and second elastic reset mechanisms are further compressed; when the bellows begins to recover from the compressed state and stretch, the external axial pressure applied to the guide structure decreases, and the compressed first and second elastic reset mechanisms immediately release their stored energy, generating a strong and active internal separation force that quickly pushes the guide shaft and guide sleeve apart axially. This overcomes the defect in the prior art where the reset separation of the guide device relies solely on the weak restoring force of the bellows itself and cannot guarantee reliable reset during long-term cyclic operation. It provides stable and effective full-stroke radial support for long-stroke bellows and prevents them from becoming unstable and deformed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the present invention under tension. Figure 2 This is a structural diagram of the present invention in a compressed state; Figure 3 This is the front view of the present invention.

[0019] Among them, 1 is the guide shaft, 2 is the guide sleeve, 3 is the guide shaft key, 4 is the guide sleeve key, 5 is the compression spring, and 6 is the spring seat. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0024] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0025] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0028] Example 1 refer to Figure 1 and Figure 3 The spring preload self-resetting circular support inner guide structure of the present invention includes a guide shaft 1, a guide sleeve 2, and a plurality of guide shaft keys 3; one end of each guide shaft key 3 is fixed to the outer circumferential surface of the guide shaft 1, and the other end of each guide shaft key 3 is connected to the side of the guide sleeve 2 through a first elastic reset mechanism. A key gap is provided between adjacent guide shaft keys 3, and a guide sleeve key 4 is provided in the key gap. One end of the guide sleeve key 4 is fixed to the side wall of the guide sleeve 2, and the other end of the guide sleeve key 4 is connected to the outer circumferential surface of the guide shaft 1 through a second elastic reset mechanism.

[0029] During operation, when the bellows is compressed, the relative movement at both ends of the bellows forces the guide shaft 1 and the guide sleeve 2 to move closer together. During this process, the external force overcomes the elastic force of the first and second elastic reset mechanisms and further compresses them. When the bellows begins to recover from the compressed state, the external axial pressure applied to the guide structure decreases, and the compressed first and second elastic reset mechanisms immediately release their stored energy, generating a strong and active internal separation force that quickly pushes the guide shaft 1 and the guide sleeve 2 apart axially.

[0030] Example 2 To further improve this application, refer to Figure 1 The spring preload self-resetting circular support inner guide structure of the present invention includes a guide shaft 1, a guide sleeve 2, a first elastic reset mechanism, a second elastic reset mechanism, a plurality of guide shaft keys 3 and a plurality of guide sleeve keys 4.

[0031] Specifically, the guide shaft 1 has a cylindrical structure, wherein one end of each guide shaft key 3 is fixed to the outer circumferential surface of the guide shaft 1, and the guide shaft keys 3 are evenly distributed in sequence along the circumferential direction. The other end of each guide shaft key 3 is connected to the side of the guide sleeve 2 through a first elastic reset mechanism. A key gap is provided between adjacent guide shaft keys 3, and a guide sleeve key 4 is provided in the key gap. One end of the guide sleeve key 4 is fixed to the side wall of the guide sleeve 2, and the other end of the guide sleeve key 4 is connected to the outer circumferential surface of the guide shaft 1 through a second elastic reset mechanism. That is, the guide shaft keys 3 and the guide sleeve keys 4 are arranged alternately in sequence along the circumferential direction and are inserted into each other's key gaps to form a precision guide pair that only allows axial relative sliding and restricts circumferential relative rotation. The radius of the outer arc surface of the guide shaft key 3 is the same as the radius of the outer arc surface of the guide sleeve key 4. When the guide shaft key 3 and the guide sleeve key 4 move in an alternating manner, the outer surfaces of all the guide shaft keys 3 and the guide sleeve key 4 together form a continuous and smooth circular support surface, which is used to tightly fit the inner wall of the bellows.

[0032] In this embodiment, both the first elastic reset mechanism and the second elastic reset mechanism are compression springs 5. Spring seats 6 for connecting the compression springs 5 ​​are provided on the end face of the guide shaft key 3, the end face of the guide sleeve key 4, the outer peripheral surface of the guide shaft 1, and the side surface of the guide sleeve 2.

[0033] The working principle of this invention is as follows: Initial and closing (tensioning) states: such as Figure 1 As shown, in the natural state or when the bellows is stretched, the preload of the first elastic reset mechanism and the second elastic reset mechanism pushes the guide shaft 1 and the guide sleeve 2 to the maximum opening position that are far apart from each other.

[0034] Opening (compression) stroke: For example Figure 2 As shown, when the bellows is compressed, the relative movement at both ends forces the guide shaft 1 and the guide sleeve 2 closer together. During this process, the external force overcomes the elastic force of the first and second elastic reset mechanisms, further compressing them and storing mechanical energy as elastic potential energy. Throughout the compression stroke, the interlocking guide shaft key 3 and guide sleeve key 4 always form a dynamic, continuous circular support surface, providing continuous and stable radial support to the compressed bellows inner wall, effectively suppressing bulging deformation.

[0035] Active self-resetting separation (recovery tension) stroke: When the bellows begins to recover tension from compression, the external axial pressure applied to the guide structure decreases. Once the external force is less than the elastic force stored in the first and second elastic reset mechanisms, the compressed first and second elastic reset mechanisms immediately release their stored energy, generating a strong, active internal separation force that rapidly pushes the guide shaft 1 and guide sleeve 2 apart axially until they return to their original tension. Figure 1 The initial maximum opening distance is shown. This process is fully automatic and reliable, ensuring that the guide structure can reliably separate and reset after each working cycle.

[0036] The installation process of this invention is as follows: First, accurately place the compression spring 5 into the spring seat 6 at the end of the guide shaft 1; then align the guide shaft 1 with the guide sleeve 2, so that the guide sleeve key 4 and the guide shaft key 3 are circumferentially offset, and push the guide shaft 1 into the guide sleeve 2 against the spring force to form a pre-assembled guide assembly; finally, install the guide assembly into the bellows as a whole, and complete the final assembly with the moving end cover plate, conductive rod and other components.

[0037] In other embodiments of the present invention, the form of the elastic reset mechanism can also be selected from other forms of elastic energy storage elements, such as disc spring groups, wave springs, or special polymer elastomers suitable for vacuum environments, depending on space and force requirements. The arrangement of the elastic elements can also be achieved using a single large-diameter annular spring or a central spring. The cross-sectional shape of the guide sleeve key 4 and the guide shaft key 3 can also be designed as rectangular, trapezoidal, or other shapes that can achieve reliable guiding fit, depending on the requirements of load bearing and processing technology.

[0038] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0039] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A spring pre-tensioned self-resetting homocentric support inner guide structure, characterized by, The guide shaft (1), the guide sleeve (2) and a plurality of guide shaft keys (3) are included. One end of each guide shaft key (3) is fixed to the outer circumferential surface of the guide shaft (1), and the other end of each guide shaft key (3) is connected to the side surface of the guide sleeve (2) through a first elastic reset mechanism. A key gap is arranged between adjacent guide shaft keys (3), and a guide sleeve key (4) is arranged in the key gap. One end of the guide sleeve key (4) is fixed to the side wall of the guide sleeve (2), and the other end of the guide sleeve key (4) is connected to the outer circumferential surface of the guide shaft (1) through a second elastic reset mechanism.

2. The spring pre-tightened self-resetting homocentric support and guide structure according to claim 1, characterized in that, The guide shaft (1) is in a cylindrical structure.

3. The spring pre-tightened self-resetting homocentric support and guide structure according to claim 1, characterized in that, Each guide shaft key (3) is uniformly distributed along the circumference.

4. The spring pre-tightened self-resetting homocentric support and guide structure according to claim 1, characterized in that, Each guide shaft key (3) and the guide sleeve key (4) are arranged in a staggered manner along the circumference.

5. The spring-preloaded self-resetting homocentric support and guide structure of claim 1, wherein, The radius corresponding to the outer arc surface of the guide shaft key (3) is the same as the radius corresponding to the outer arc surface of the guide sleeve key (4).

6. The spring-preloaded self-resetting homocentric support and guide structure according to claim 5, characterized in that, When the guide shaft key (3) and the guide sleeve key (4) move in a staggered manner, the outer surfaces of all the guide shaft keys (3) and the guide sleeve keys (4) together form a continuous and smooth supporting surface of the same circle.

7. The spring-preloaded self-resetting homocentric support and guide structure of claim 1, wherein, The first elastic reset mechanism and the second elastic reset mechanism are both compression springs (5).

8. The spring-preloaded self-resetting homocentric support and guide structure according to claim 7, characterized in that, The end surface of the guide shaft key (3), the end surface of the guide sleeve key (4), the outer circumferential surface of the guide shaft (1) and the side surface of the guide sleeve (2) are all provided with spring seats (6) for connecting the compression springs (5).

9. The spring-preloaded self-resetting homocentric support and guide structure of claim 8, wherein, The compression spring (5) is a disc spring group or a wave spring.

10. The spring-preloaded self-resetting homocentric support and guide structure of claim 1, wherein, The guide sleeve key (4) and the guide shaft key (3) are in a rectangular or trapezoidal structure.

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