Insulated pull rod assembly and vacuum circuit breaker

Abstract

The application relates to an insulating pull rod assembly and a vacuum circuit breaker. The insulating pull rod assembly comprises: an elastic buffer structure, which comprises a limiting substructure, at least two elastic deformation insulating strips and a first connecting part; the limiting substructure comprises an upper limiting table and a lower limiting column, the lower limiting column comprises a first limiting end connected with the upper limiting table and a second limiting end away from the first limiting end; the at least two elastic deformation insulating strips are coaxially distributed around the lower limiting column, one end of the elastic deformation insulating strip is fixedly connected with the upper limiting table, and the other end of the elastic deformation insulating strip is fixedly connected with the first connecting part; an insulating pull rod, the insulating pull rod and a moving conducting rod of the vacuum circuit breaker are fixedly connected on the two sides of the elastic buffer structure, the insulating pull rod is connected with the first connecting part, and the upper limiting table is connected with the moving conducting rod of the vacuum circuit breaker. The application can reduce the moving quality of the vacuum circuit breaker.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to an insulating tie rod assembly and a vacuum circuit breaker. Background Technology

[0002] With the rapid development of the power industry, vacuum circuit breakers, as an important component of the power system, directly affect the safe and stable operation of the power grid. Vacuum circuit breakers are widely used in power transmission and distribution due to their excellent arc-extinguishing performance, long lifespan, and environmental friendliness. However, with the continuous increase in voltage levels, the current-carrying capacity and breaking capacity of vacuum circuit breakers have increased significantly. Higher holding forces are required for the contacts in the closed state, which leads to a substantial increase in the stiffness and compression stroke of the contact springs. This results in a significant increase in the overall mass of the contact spring assembly, severely affecting contact collision during closing and the speed of the moving contact during opening, which is detrimental to the stable operation of the circuit breaker.

[0003] Furthermore, existing contact springs are typically independent components, with force transmission between them and the insulating rod achieved only through mechanical connection. This structure has shortcomings in terms of spatial arrangement, transmission efficiency, and mass distribution. At the same time, the fact that the contact spring is an independent component increases assembly complexity and makes it prone to positional deviations during manufacturing and assembly, affecting the overall mechanical synchronization and insulation performance of the circuit breaker.

[0004] Therefore, vacuum circuit breakers in related technologies suffer from problems such as excessive moving mass, limited opening speed, significant contact bounce, and high assembly complexity. Summary of the Invention

[0005] Therefore, it is necessary to provide an insulating tie rod assembly and a vacuum circuit breaker, which aims to solve the problems of excessive moving mass, limited opening speed, significant contact bounce, and high assembly complexity of vacuum circuit breakers in related technologies.

[0006] According to a first aspect of this application, an insulating tie rod assembly is provided for a vacuum circuit breaker, the insulating tie rod assembly comprising:

[0007] An elastic buffer structure includes a limiting substructure, at least two elastically deformable insulating strips, and a first connecting portion; the limiting substructure includes an upper limiting platform and a lower limiting post, the lower limiting post including a first limiting end connected to the upper limiting platform and a second limiting end away from the first limiting end; at least two elastically deformable insulating strips are coaxially distributed around the lower limiting post, one end of each elastically deformable insulating strip is fixedly connected to the upper limiting platform, and the other end of each elastically deformable insulating strip is fixedly connected to the first connecting portion;

[0008] An insulating pull rod is provided, and the insulating pull rod and the moving conductive rod of the vacuum circuit breaker are respectively fixedly connected to both sides of the elastic buffer structure. The insulating pull rod is connected to the first connecting part, and the upper limiting platform is connected to the moving conductive rod of the vacuum circuit breaker.

[0009] In the case where the circuit breaker is in a stationary state after the tripping operation, the second limiting end of the lower limiting post is spaced apart from the first connecting part, and the elastic deformation insulating strip is in contact with the side of the lower limiting post.

[0010] When the circuit is closed and the device is stationary, the second limiting end of the lower limiting post is in contact with the first connecting part, and the elastic deformation insulating strip is spaced apart from the side of the lower limiting post.

[0011] In some embodiments, the upper limiting platform includes a first limiting surface and a second limiting surface arranged opposite to each other, and the moving conductive rod of the vacuum circuit breaker is connected to the first limiting surface;

[0012] The first limiting end of the lower limiting post and one end of the elastic deformation insulating strip are connected to the second limiting surface.

[0013] In some embodiments, the side surface of the lower limiting post is an arc or slope in a first direction, which is parallel to the direction in which the upper limiting platform points to the first connecting portion.

[0014] In some embodiments, in the direction where the upper limiting platform points towards the first connecting portion, the width of the lower limiting post first gradually increases and then gradually decreases; and / or,

[0015] The lower limiting post is made of elastically deformable material.

[0016] In some embodiments, the limiting substructure is T-shaped; and / or,

[0017] The limiting substructure and the first connecting portion include insulating material; and / or,

[0018] The cross-sectional shape of the elastically deformable insulating strip in the second direction is circular, square, elliptical, or rectangular, and the second direction is perpendicular to the extension direction of the elastically deformable insulating strip; and / or,

[0019] The materials for elastically deformable insulating strips include insulating polymers or insulating composite materials.

[0020] In some embodiments, the first connecting portion includes a first connecting surface and a second connecting surface disposed opposite to each other, the other end of the elastically deformable insulating strip is connected to the first connecting surface, and the insulating pull rod is connected to the second connecting surface;

[0021] The orthographic projection of the connection point between the elastically deformable insulating strip and the second limiting surface onto the plane of the second limiting surface is located within the range of the orthographic projection of the lower limiting post onto the plane of the second limiting surface;

[0022] The orthographic projection of the connection point between the elastically deformable insulating strip and the first connecting surface onto the plane of the first connecting surface is located within the range of the orthographic projection of the lower limiting post onto the plane of the first connecting surface.

[0023] In some embodiments, the number of the elastically deformable insulating strips is 2-200.

[0024] In some embodiments, the connection method between the elastic deformation insulating strip and the second limiting surface of the upper limiting platform includes at least one of snap-fit, press-fit connection, adhesive connection and threaded connection.

[0025] According to a second aspect of this application, based on the same concept, a vacuum circuit breaker is provided, comprising the insulating tie rod assembly described in any one of the preceding claims.

[0026] In some implementations, the vacuum circuit breaker includes:

[0027] Vacuum interrupter;

[0028] The static side support structure and the dynamic side support structure are respectively arranged on both sides of the vacuum interrupter;

[0029] The upper wiring board is connected to the stationary side support structure and is located on the side of the stationary side support structure away from the vacuum interrupter;

[0030] The lower terminal block is connected to the moving side support structure and is located on the side of the moving side support structure away from the vacuum interrupter. The insulating tie rod passes through the lower terminal block.

[0031] An insulating composite sleeve is sleeved on the outer periphery of the insulating tie rod assembly, the vacuum interrupter, the static side support structure, and the dynamic side support structure, and the insulating composite sleeve is located between the upper terminal block and the lower terminal block.

[0032] In the embodiments of this application, firstly, in the open position, the elastic deformation insulating strip is in a contracted state. Compared to traditional vacuum circuit breakers that typically use steel helical springs as contact springs, which are large and heavy, the elastic buffer structure reduces the inertial mass of moving parts and shortens the opening response time. Secondly, in the closed position, the elastic deformation insulating strip is in an expanded state and works with the limiting substructure to bear the closing pressure, ensuring stable contact positioning and operational reliability. Thirdly, through optimized design of the insulating rod and elastic buffer structure, the limiting substructure and elastic insulating material are combined to integrate the function of the contact spring into the insulating rod assembly, forming an efficient force transmission and buffering combination. This effectively absorbs and releases contact movement energy during closing and opening, reducing contact collision impact, thereby significantly suppressing contact bounce, improving the opening and closing stability and breaking performance of the vacuum circuit breaker, and extending the service life of the entire unit. The embodiments of this application have at least one of the above-mentioned beneficial effects.

[0033] In this application, firstly, addressing the problems of excessive moving mass, limited opening speed, and high assembly complexity of the contact spring assembly in high-voltage vacuum circuit breakers, an insulating pull rod assembly is proposed that organically combines an elastic buffer structure with an insulating pull rod. This significantly reduces the mass of moving parts and effectively improves opening speed and operational stability. Secondly, the elastic buffer structure, through the coaxial distribution of the limiting substructure and the elastically deformable insulating strip, generates elastic deformation in different directions during opening and closing states, achieving the dual functions of contact holding force and rapid opening release force, without adversely affecting the normal closing and opening stroke of the vacuum circuit breaker. Thirdly, the insulating pull rod assembly has a compact structure, organically integrating the contact spring function with the insulating pull rod, reducing the space occupation and mechanical connection links of independent spring assemblies, improving transmission efficiency and assembly accuracy, while meeting the insulation performance and mechanical synchronization requirements of high-voltage vacuum circuit breakers. This application embodiment has at least one of the above-mentioned beneficial effects. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments 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.

[0035] Figure 1 This is an overall schematic diagram of an insulating tie rod assembly in the open state, provided for some embodiments of this application.

[0036] Figure 2This is a cross-sectional schematic diagram of an insulating tie rod assembly in the open state, provided for some embodiments of this application.

[0037] Figure 3 This is an overall schematic diagram of an insulating tie rod assembly in the closed state, provided for some embodiments of this application.

[0038] Figure 4 This is a cross-sectional schematic diagram of an insulating tie rod assembly in the closed state, provided for some embodiments of this application.

[0039] Figure 5 This is an overall schematic diagram of a limiting substructure in an insulating tie rod assembly provided in some embodiments of this application.

[0040] Figure 6 This is a cross-sectional schematic diagram of a limiting substructure in an insulating tie rod assembly provided for some embodiments of this application.

[0041] Figure 7 This is a schematic diagram of a vacuum circuit breaker in the open state, provided for some embodiments of this application.

[0042] Figure 8 This is a schematic diagram of a vacuum circuit breaker in the closed state, provided for some embodiments of this application.

[0043] Reference numerals: Vacuum circuit breaker 100; Insulating tie rod assembly 10; Elastic buffer structure 11; Insulating tie rod 12; Limiting substructure 101; Elastically deformable insulating strip 102; First connecting part 103; Upper limiting platform 1011; Lower limiting post 1012; First limiting end 1012a; Second limiting end 1012b; First limiting surface 1011a; Second limiting surface 1011b; First connecting surface 103a; Second connecting surface 103b;

[0044] First direction Y; Second direction X; Vacuum interrupter 201; Static side support structure 207; Moving side support structure 208; Upper terminal block 209; Lower terminal block 210; Insulating composite sleeve 211; Static end contact 2012; Static conductive rod 2014; Moving end contact 2011; Moving conductive rod 2013; Heat sink 205. Detailed Implementation

[0045] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] When describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more intermediate elements present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more intermediate elements present.

[0048] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0049] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0050] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0051] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0052] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0053] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0054] As described in the background section, vacuum circuit breakers in related technologies suffer from problems such as excessive moving mass, limited opening speed, significant contact bounce, and high assembly complexity. Firstly, with the continuous increase in voltage levels, the current-carrying capacity and breaking capacity of vacuum circuit breakers have significantly increased. The contacts require higher holding force in the closed state, which leads to a substantial increase in the stiffness and compression stroke of the contact springs. This results in a significant increase in the overall mass of the contact spring assembly, severely affecting the collision of closing contacts and the speed of the opening moving contact in the vacuum circuit breaker, thus hindering stable operation. Secondly, existing contact springs are typically independent components, with force transmission only achieved through mechanical connection to the insulating rod. This structure has shortcomings in spatial arrangement, transmission efficiency, and mass distribution. Thirdly, the independent nature of the contact spring increases assembly complexity, making it prone to positional deviations during manufacturing and assembly, affecting the overall mechanical synchronization and insulation performance of the circuit breaker. Therefore, existing high-voltage vacuum circuit breakers generally suffer from problems such as excessive moving mass, limited opening speed, significant contact bounce, and high assembly complexity in the structural design of contact spring assemblies and insulating rods. There is an urgent need for an improved structure that can organically combine the function of the contact spring with the structure of the insulating rod, effectively reducing moving mass and improving opening speed and operational stability while ensuring contact holding force and insulation performance, in order to meet the requirements of high-voltage, high-capacity vacuum circuit breakers in terms of breaking performance and long-term operational reliability.

[0055] To address the aforementioned issues, this application provides an insulating tie rod assembly and a vacuum circuit breaker.

[0056] Please see Figures 1 to 8 . Figure 1 This is an overall schematic diagram of an insulating tie rod assembly in the open state, provided for some embodiments of this application. Figure 2 This is a cross-sectional schematic diagram of an insulating tie rod assembly in the open state, provided for some embodiments of this application. Figure 3 This is an overall schematic diagram of an insulating tie rod assembly in the closed state, provided for some embodiments of this application. Figure 4 This is a cross-sectional schematic diagram of an insulating tie rod assembly in the closed state, provided for some embodiments of this application. Figure 5 This is an overall schematic diagram of a limiting substructure in an insulating tie rod assembly provided in some embodiments of this application. Figure 6This is a cross-sectional schematic diagram of a limiting substructure in an insulating tie rod assembly provided for some embodiments of this application. Figure 7 This is a schematic diagram of a vacuum circuit breaker in the open state, provided for some embodiments of this application. Figure 8 This is a schematic diagram of a vacuum circuit breaker in the closed state, provided for some embodiments of this application.

[0057] In a first aspect, this application provides an insulating pull rod assembly 10 for use in a vacuum circuit breaker 100. The insulating pull rod assembly 10 includes an elastic buffer structure 11 and an insulating pull rod 12. The elastic buffer structure 11 includes a limiting substructure 101, at least two elastically deformable insulating strips 102, and a first connecting portion 103. The limiting substructure 101 includes an upper limiting platform 1011 and a lower limiting post 1012. The lower limiting post 1012 includes a first limiting end 1012a connected to the upper limiting platform 1011 and a second limiting end 1012b away from the first limiting end 1012a. At least two elastically deformable insulating strips 102 are coaxially distributed around the lower limiting post 1012. One end of the elastically deformable insulating strip 102 is fixedly connected to the upper limiting platform 1011, and the other end of the elastically deformable insulating strip 102 is fixedly connected to the first connecting portion 103. The insulating pull rod 12 and the moving conductive rod 2013 of the vacuum circuit breaker 100 are fixedly connected to both sides of the elastic buffer structure 11. The insulating pull rod 12 is connected to the first connecting part 103, and the upper limiting platform 1011 is connected to the moving conductive rod 2013 of the vacuum circuit breaker 100. When the circuit is open and stationary, the second limiting end 1012b of the lower limiting post 1012 is spaced apart from the first connecting part 103, and the elastically deformable insulating strip 102 contacts the side of the lower limiting post 1012. When the circuit is closed and stationary, the second limiting end 1012b of the lower limiting post 1012 contacts the first connecting part 103, and the elastically deformable insulating strip 102 is spaced apart from the side of the lower limiting post 1012.

[0058] For example, at least two elastic deformation insulating strips 102 are coaxially distributed around the lower limiting post 1012, and at least two / or more elastic deformation insulating strips 102 are evenly or symmetrically arranged around the lower limiting post 1012.

[0059] For example, the side surface of the lower limiting post 1012 is located between the first limiting end 1012a and the second limiting end 1012b.

[0060] For example, the elastic deformation insulation strip 102 is made of a material capable of elastic deformation, or a highly elastic deformation material.

[0061] For example, such as Figure 1 and Figure 2As shown, in the open stop state (open state), the bottom of the lower limit post 1012 (second limit end 1012b) of the limit substructure 101 is separated / spaced from the first connecting part 103 (the second limit end 1012b is separated / spaced from the first connecting surface 103a). The limit substructure 101 and the first connecting part 103 are connected by an elastic deformation insulating strip 102. The elastic deformation insulating strip 102 retracts inward and contacts the side (side wall) of the lower limit post 1012.

[0062] For example, such as Figure 3 and Figure 4 As shown, in the closed static state (closed state), the bottom of the lower limiting post 1012 of the limiting substructure 101 (the second limiting end 1012b) contacts the upper surface of the first connecting part 103 (the second limiting end 1012b contacts the first connecting surface 103a), and the elastic deformation insulating strip 102 expands outward and deforms, thereby providing the contact with the closing holding force.

[0063] For example, in some implementations, after the circuit breaker trips, such as Figure 1 and Figure 2 As shown, the elastic deformation insulating strip (102) is in a tensile stress and tension state; after the switch is closed, as... Figure 3 and Figure 4 As shown, the elastically deformable insulating strip (102) is in a compressive stress or compression state. However, it is not limited to this.

[0064] In the embodiments of this application, in the first aspect, such as Figure 1 and Figure 2 As shown, in the open position, the elastic deformation insulating strip 102 is in a contracted state. Compared with traditional vacuum circuit breakers that typically use steel helical springs as contact springs, which are large in size and heavy, the elastic buffer structure 11 reduces the inertial mass of moving parts and shortens the opening response time. Secondly, as... Figure 3 and Figure 4 As shown, in the closed position, the elastic deformation insulating strip 102 is in an outward-expanding state and works with the limiting substructure 101 to jointly bear the closing pressure, ensuring stable contact positioning and operational reliability. Thirdly, through optimized design of the insulating pull rod 12 and the elastic buffer structure 11, the limiting substructure 101 and the elastic insulating material are combined to integrate the function of the contact spring into the insulating pull rod assembly 10, forming an efficient force transmission and buffering combination. This effectively absorbs and releases the contact movement energy during closing and opening, reducing contact collision impact, thereby significantly suppressing contact bounce, improving the opening and closing stability and breaking performance of the vacuum circuit breaker 100, and extending the overall service life.

[0065] In this application embodiment, firstly, addressing the problems of excessive moving mass, limited opening speed, and high assembly complexity of the contact spring assembly in the high-voltage vacuum circuit breaker 100, an insulating pull rod assembly 10 is proposed, organically combining the elastic buffer structure 11 and the insulating pull rod 12. This significantly reduces the mass of moving parts and effectively improves the opening speed and operational stability. Secondly, the elastic buffer structure 11, through the coaxial distribution of the limiting substructure 101 and the elastic deformation insulating strip 102, generates elastic deformation in different directions during the opening and closing states, realizing the dual functions of contact closing holding force and rapid opening release force, without adversely affecting the normal closing and opening stroke of the vacuum circuit breaker 100. Thirdly, the insulating pull rod assembly 10 has a compact structure, organically integrating the contact spring function with the insulating pull rod 12, reducing the space occupation and mechanical connection links of independent spring assemblies, improving transmission efficiency and assembly accuracy, while meeting the insulation performance and mechanical synchronization requirements of the high-voltage vacuum circuit breaker 100.

[0066] In some embodiments, the upper limiting platform 1011 includes a first limiting surface 1011a and a second limiting surface 1011b arranged opposite to each other. The moving conductive rod 2013 of the vacuum circuit breaker 100 is connected to the first limiting surface 1011a; the first limiting end 1012a of the lower limiting post 1012 and one end of the elastically deformable insulating strip 102 are connected to the second limiting surface 1011b. During closing and opening movements, interference between the moving conductive rod 2013 and the elastically deformable insulating strip 102 and the upper limiting platform 1011 can be avoided.

[0067] In some embodiments, the side surface of the lower limiting post 1012 is an arc or inclined surface in the first direction Y, which is parallel to the direction of the upper limiting platform 1011 pointing to the first connecting part 103.

[0068] For example, the first direction Y is parallel to the direction from the upper limiting platform 1011 to the first connecting part 103, the first direction Y is also parallel to the extension direction of the insulating pull rod 12, and the first direction Y is also parallel to the direction from the first limiting end 1012a to the second limiting end 1012b.

[0069] For example, the side surface of the lower limiting post 1012 is curved or inclined in the first direction Y, for example, in Figure 2In the cross-sectional structure, the edge of the side surface of the lower limiting post 1012 is arc-shaped or inclined, so that when the circuit is closed and stationary, the second limiting end 1012b of the lower limiting post 1012 is spaced apart from the first connecting part 103, and the elastically deformable insulating strip 102 is in contact with the side of the lower limiting post 1012. Similarly, when the circuit is closed and stationary, the second limiting end 1012b of the lower limiting post 1012 is in contact with the first connecting part 103, and the elastically deformable insulating strip 102 is spaced apart from the side of the lower limiting post 1012.

[0070] In some embodiments, in the direction of the upper limiting platform 1011 pointing to the first connecting portion 103, the width of the lower limiting post 1012 gradually increases and then gradually decreases; and / or, the lower limiting post 1012 includes an elastically deformable material.

[0071] For example, in the direction from the upper limiting platform 1011 to the first connecting portion 103, the width of the lower limiting post 1012 first gradually increases and then gradually decreases, for example, in Figure 2 In the cross-sectional structure, the edge of the side surface of the lower limiting post 1012 is arc-shaped or inclined, so that when the circuit is closed and stationary, the second limiting end 1012b of the lower limiting post 1012 is spaced apart from the first connecting part 103, and the elastically deformable insulating strip 102 is in contact with the side of the lower limiting post 1012. Similarly, when the circuit is closed and stationary, the second limiting end 1012b of the lower limiting post 1012 is in contact with the first connecting part 103, and the elastically deformable insulating strip 102 is spaced apart from the side of the lower limiting post 1012.

[0072] For example, the lower limiting post 1012 includes an elastically deformable material. (As...) Figure 3 and Figure 4 As shown, in the closed position, the limiting substructure 101 / lower limiting post 1012, together with the elastic deformation insulating strip 102, bears the closing pressure. The limiting substructure 101 / lower limiting post 1012 also has a buffering effect, thereby ensuring stable contact positioning and operational reliability.

[0073] In some embodiments, the limiting substructure 101 is T-shaped; and / or, the limiting substructure 101 and the first connecting portion 103 include insulating material; and / or, the cross-sectional shape of the elastically deformable insulating strip 102 in the second direction X is circular, square, elliptical or rectangular, and the second direction X is perpendicular to the extension direction of the elastically deformable insulating strip 102; and / or, the material of the elastically deformable insulating strip 102 includes insulating polymer or insulating composite material.

[0074] For example, the material of the elastically deformable insulating strip 102 can be a pure insulating polymer or an insulating composite material capable of elastic deformation.

[0075] In some embodiments, the first connecting portion 103 includes a first connecting surface 103a and a second connecting surface 103b disposed opposite to each other. The other end of the elastically deformable insulating strip 102 is connected to the first connecting surface 103a, and the insulating pull rod 12 is connected to the second connecting surface 103b. The connection point between the elastically deformable insulating strip 102 and the second limiting surface 1011b is located within the orthographic projection of the lower limiting post 1012 onto the plane of the second limiting surface 1011b. The connection point between the elastically deformable insulating strip 102 and the first connecting surface 103a is located within the orthographic projection of the lower limiting post 1012 onto the plane of the first connecting surface 103a.

[0076] For example, the orthographic projection of the connection point between the elastic deformable insulating strip 102 and the second limiting surface 1011b onto the plane of the second limiting surface 1011b is within the range of the orthographic projection of the lower limiting post 1012 onto the plane of the second limiting surface 1011b. Similarly, the orthographic projection of the connection point between the elastic deformable insulating strip 102 and the first connecting surface 103a onto the plane of the first connecting surface 103a is within the range of the orthographic projection of the lower limiting post 1012 onto the plane of the first connecting surface 103a. This ensures that, when the circuit is stationary after the tripping operation, the second limiting end 1012b of the lower limiting post 1012 is spaced apart from the first connecting portion 103, and the elastic deformable insulating strip 102 contacts the side of the lower limiting post 1012. This arrangement ensures that, under the condition that the circuit is closed and the device is stationary, the second limiting end 1012b of the lower limiting post 1012 is in contact with the first connecting part 103, and the elastic deformation insulating strip 102 is spaced apart from the side of the lower limiting post 1012.

[0077] In some embodiments, the number of elastically deformable insulating strips 102 is 2-200.

[0078] For example, the number of elastic deformation insulating strips 102 is 2-200, and the number of elastic deformation insulating strips 102 can be any value among 2, 10, 50, 80, 100, 120, 150, 180 and 200.

[0079] In some embodiments, the connection method between the elastic deformation insulating strip 102 and the second limiting surface 1011b of the upper limiting platform 1011 includes at least one of snap-fit, press-fit connection, adhesive connection and threaded connection.

[0080] It should be noted that the materials of the limiting substructure 101, the elastic deformation insulating strip 102 and the first connecting part 103 can be insulating materials or metal materials to ensure the structural strength and insulation performance of the vacuum circuit breaker 100 of different voltage levels.

[0081] Secondly, based on the same application concept, such as Figure 7 and Figure 8 As shown, this application embodiment provides a vacuum circuit breaker 100, which includes the insulating tie rod assembly 10 of any of the above.

[0082] In some embodiments, the vacuum circuit breaker 100 includes a vacuum interrupter 201, a stationary support structure 207 and a moving support structure 208, an upper terminal block 209, a lower terminal block 210, and an insulating composite bushing 211. The stationary support structure 207 and the moving support structure 208 are respectively disposed on both sides of the vacuum interrupter 201; the upper terminal block 209 is connected to the stationary support structure 207 and is located on the side of the stationary support structure 207 away from the vacuum interrupter 201; the lower terminal block 210 is connected to the moving support structure 208 and is located on the side of the moving support structure 208 away from the vacuum interrupter 201, and the insulating pull rod 12 passes through the lower terminal block 210; the insulating composite bushing 211 is sleeved on the outer periphery of the insulating pull rod assembly 10, the vacuum interrupter 201, the stationary support structure 207, and the moving support structure 208, and the insulating composite bushing 211 is located between the upper terminal block 209 and the lower terminal block 210.

[0083] For example, the insulating tie rod assembly 10 is applied in the vacuum circuit breaker 100. The vacuum circuit breaker 100 includes the aforementioned insulating tie rod 12 and elastic buffer structure 11, vacuum interrupter 201, stationary side support structure 207 and moving side support structure 208 placed on both sides of the vacuum interrupter 201, upper terminal block 209 connected above the stationary side support structure 207 and heat dissipation cap, lower terminal block 210 connected below the moving side support structure 208, and an insulating composite sleeve 211 wrapped around the outermost layer.

[0084] For example, the vacuum interrupter 201 can be any of the vacuum interrupters in the prior art. The vacuum interrupter 201 may include a stationary contact 2012 and a stationary conductive rod 2014 connected to the stationary contact 2012, as well as a moving contact 2011 and a moving conductive rod 2013 connected to the moving contact 2011. The structure of the vacuum interrupter 201 is not limited to this. For example, the vacuum interrupter 201 may include a heat sink 205 located on the side of the upper terminal block 209 away from the lower terminal block 210.

[0085] For example, the vacuum circuit breaker 100 has the beneficial effects of any of the insulating tie rod assemblies 10 described above, which will not be repeated here.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An insulating tie rod assembly, characterized in that, For use in vacuum circuit breakers, the insulating tie rod assembly includes: An elastic buffer structure includes a limiting substructure, at least two elastically deformable insulating strips, and a first connecting portion; the limiting substructure includes an upper limiting platform and a lower limiting post, the lower limiting post including a first limiting end connected to the upper limiting platform and a second limiting end away from the first limiting end; at least two elastically deformable insulating strips are coaxially distributed around the lower limiting post, one end of each elastically deformable insulating strip is fixedly connected to the upper limiting platform, and the other end of each elastically deformable insulating strip is fixedly connected to the first connecting portion; An insulating pull rod is provided, and the insulating pull rod and the moving conductive rod of the vacuum circuit breaker are respectively fixedly connected to both sides of the elastic buffer structure. The insulating pull rod is connected to the first connecting part, and the upper limiting platform is connected to the moving conductive rod of the vacuum circuit breaker. In the case where the circuit breaker is in a stationary state after the tripping operation, the second limiting end of the lower limiting post is spaced apart from the first connecting part, and the elastic deformation insulating strip is in contact with the side of the lower limiting post. When the circuit is closed and the device is stationary, the second limiting end of the lower limiting post is in contact with the first connecting part, and the elastic deformation insulating strip is spaced apart from the side of the lower limiting post. The upper limiting platform includes a first limiting surface and a second limiting surface arranged opposite to each other, and the moving conductive rod of the vacuum circuit breaker is connected to the first limiting surface; the first limiting end of the lower limiting post and one end of the elastically deformable insulating strip are connected to the second limiting surface; The first connecting part includes a first connecting surface and a second connecting surface arranged opposite to each other, the other end of the elastically deformable insulating strip is connected to the first connecting surface, and the insulating pull rod is connected to the second connecting surface; The orthographic projection of the connection point between the elastically deformable insulating strip and the second limiting surface onto the plane of the second limiting surface is located within the range of the orthographic projection of the lower limiting post onto the plane of the second limiting surface; The orthographic projection of the connection point between the elastically deformable insulating strip and the first connecting surface onto the plane of the first connecting surface is located within the range of the orthographic projection of the lower limiting post onto the plane of the first connecting surface.

2. The insulating tie rod assembly according to claim 1, characterized in that, The side surface of the lower limiting post is an arc or slope in a first direction, which is parallel to the direction in which the upper limiting platform points to the first connecting part.

3. The insulating tie rod assembly according to claim 1, characterized in that, In the direction from the upper limiting platform to the first connecting portion, the width of the lower limiting post first gradually increases and then gradually decreases; and / or, The lower limiting post is made of elastically deformable material.

4. The insulating tie rod assembly according to claim 1, characterized in that, The limiting substructure is T-shaped; and / or, The limiting substructure and the first connecting portion include insulating material; and / or, The cross-sectional shape of the elastically deformable insulating strip in the second direction is circular, square, elliptical, or rectangular, and the second direction is perpendicular to the extension direction of the elastically deformable insulating strip; and / or, The materials for elastically deformable insulating strips include insulating polymers or insulating composite materials.

5. The insulating tie rod assembly according to claim 1, characterized in that, The number of the elastic deformation insulating strips is 2-200.

6. The insulating tie rod assembly according to claim 1, characterized in that, The connection method between the elastic deformation insulating strip and the second limiting surface of the upper limiting platform includes at least one of snap-fit ​​connection, press-fit connection, adhesive connection and threaded connection.

7. A vacuum circuit breaker, characterized in that, Includes the insulating tie rod assembly as described in any one of claims 1 to 6.

8. The vacuum circuit breaker according to claim 7, characterized in that, include: Vacuum interrupter; The static side support structure and the dynamic side support structure are respectively arranged on both sides of the vacuum interrupter; The upper wiring board is connected to the stationary side support structure and is located on the side of the stationary side support structure away from the vacuum interrupter; The lower terminal block is connected to the moving side support structure and is located on the side of the moving side support structure away from the vacuum interrupter. An insulating tie rod passes through the lower terminal block. An insulating composite sleeve is fitted around the outer periphery of the insulating tie rod assembly, the vacuum interrupter, the static side support structure, and the dynamic side support structure, and the insulating composite sleeve is located between the upper terminal block and the lower terminal block.

Images