A sliding watchband structure taking into account both the assembly process of the switching device and the long service life characteristics

Abstract

The application discloses a sliding watchband structure which takes into account the assembly process of a switch device and the long service life characteristics, comprising a connecting pull rod, a fixed cover plate, a second watchband contact finger, a conductive flange, a second connecting block, a vacuum arc-extinguishing chamber, a guide ring, a first connecting block and a first watchband contact finger; the connecting pull rod fixes the first connecting block on the end face of the vacuum arc-extinguishing chamber moving contact, the first watchband contact finger is installed between the first connecting block and the second connecting block, the fixed cover plate is installed on the second connecting block, the second watchband contact finger and the guide ring are installed between the second connecting block and the conductive flange, and the end face of the vacuum arc-extinguishing chamber moving contact sequentially passes through the first connecting block, the first watchband contact finger, the second connecting block, the second watchband contact finger and reaches the conductive flange, thereby realizing sliding through flow. The structure can simultaneously meet the requirements of 250,000 times of mechanical service life and the error requirements allowed by the assembly process, is simple in structure, saves space, is ingenious in method, high in reliability, strong in process and universality, convenient in maintenance, low in cost, and remarkable in economic benefits.

Description

Technical Field

[0001] This invention relates to a long-life sliding connection technology for commutation power supply in rail transit locomotives, and more particularly to a sliding band structure that takes into account both the assembly process of switchgear and long life characteristics. Background Technology

[0002] The high-voltage system of rail transit locomotives and rolling stock is a single-phase 25kV power supply. It is necessary to switch phases at certain intervals, which is called phase switching. Therefore, the on-board main circuit breaker needs to operate frequently. The design standard requires a mechanical life of 250,000 cycles.

[0003] In existing technologies, the electrical connection between the moving contact of the vacuum interrupter inside the main circuit breaker and the outlet flange is basically made of soft braided wire. In order to achieve the requirements of 250,000 cycles and rated current carrying capacity, multiple strands of soft braided wire are generally used, which results in a large installation space and a complex structure.

[0004] In response to the above situation, and in conjunction with the gradual engineering transformation of the miniaturization and integration design concept of high-voltage switchgear, the technical application of watch strap contact fingers has emerged both domestically and internationally. However, the current research and application of watch strap contact fingers cannot meet the technical indicator of 250,000 cycles of long life, and the requirements for the precision of the bushing fit are relatively high, which is quite demanding for the assembly structure.

[0005] In conclusion, it is essential to research and develop a sliding watchband structure that is compatible with the assembly process and long lifespan characteristics of switchgear, which is of great significance for the technological advancement and development of new high-voltage switchgear in the future.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a sliding watchband structure that takes into account both the assembly process of switching equipment and the characteristics of long life, so as to solve the above-mentioned technical problems existing in the prior art.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] The present invention provides a sliding watch strap structure that combines the assembly process and long lifespan characteristics of switchgear, comprising a connecting rod, a fixed cover plate, a second watch strap contact finger, a conductive flange, a second connecting block, a vacuum interrupter, a guide ring, a first connecting block, and a first watch strap contact finger;

[0010] The connecting rod fixes the first connecting block to the moving contact end face of the vacuum interrupter, the first watch strap finger is installed between the first connecting block and the second connecting block, the fixing cover plate is installed on the second connecting block, and the second watch strap finger and the guide ring are installed between the second connecting block and the conductive flange.

[0011] The moving contact end face of the vacuum interrupter sequentially passes through the first connecting block, the first watchband contact finger, the second connecting block, and the second watchband contact finger to reach the conductive flange for conductive connection.

[0012] Compared with the prior art, the sliding watchband structure provided by the present invention takes into account both the assembly process of switching equipment and the characteristics of long life. It can meet the technical requirements of 250,000 cycles and above, while also being able to adapt to the normal error and accuracy range allowed by the assembly process. It has a simple structure, saves space, is ingenious in method, has high reliability, strong manufacturability and versatility, is convenient to use and maintain, has low cost, and has significant economic benefits. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the structural principle of a sliding watchband structure that combines the assembly process and long lifespan characteristics of switching equipment, as provided in an embodiment of the present invention.

[0014] In the picture:

[0015] 1. Connecting rod, 2. Fixing cover plate, 3. Second strap contact finger, 4. Conductive flange, 5. Second connecting block, 6. Vacuum interrupter, 7. Guide ring, 8. First connecting block, 9. First strap contact finger. Detailed Implementation

[0016] 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 a part of the embodiments of the present invention, and not all of them, and do not constitute a limitation on the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0017] First, the following explanations are provided for the terms that may be used in this article:

[0018] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0019] The terms “including,” “comprising,” “containing,” “having,” or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, “including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.)” should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0020] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0021] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0022] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0023] The contents not described in detail in the embodiments of this invention are prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of this invention, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Where the manufacturers of the reagents or instruments used in the embodiments of this invention are not specified, they are all conventional products that can be purchased commercially.

[0024] The present invention provides a sliding watch strap structure that combines the assembly process and long lifespan characteristics of switchgear, comprising a connecting rod, a fixed cover plate, a second watch strap contact finger, a conductive flange, a second connecting block, a vacuum interrupter, a guide ring, a first connecting block, and a first watch strap contact finger;

[0025] The connecting rod fixes the first connecting block to the moving contact end face of the vacuum interrupter, the first watch strap finger is installed between the first connecting block and the second connecting block, the fixing cover plate is installed on the second connecting block, and the second watch strap finger and the guide ring are installed between the second connecting block and the conductive flange.

[0026] The moving contact end face of the vacuum interrupter sequentially passes through the first connecting block, the first watchband contact finger, the second connecting block, and the second watchband contact finger to reach the conductive flange for conductive connection.

[0027] The second connecting block only contacts the first strap contact finger, the second strap contact finger, and the guide ring, and has no other fixed constraints, and is in a free state within a specified range.

[0028] The second watchband contact finger has a small gap, low elasticity, and surface contact structure, which is used for a large stroke sliding connection; the first watchband contact finger has a large gap, high elasticity, and multi-point contact structure, which is used for a static or small stroke sliding connection.

[0029] At least one first watch band contact finger is installed, and at least two second watch band contact fingers are installed.

[0030] At least two guide rings are installed, distributed on both sides of the second strap finger, and the height of the guide ring protruding from the second connecting block is slightly less than the gap between the second connecting block and the conductive flange. The guide ring is made of non-metallic self-lubricating material.

[0031] The assembly process is as follows:

[0032] First, after fixing the vacuum interrupter and the conductive flange, install the guide ring and the second watch strap contact finger on the second connecting block, and then install them into the conductive flange as a whole.

[0033] Secondly, the first watch strap contact finger is installed on the first connecting block, and then the whole assembly is installed inside the second connecting block. The connecting rod passes through the first connecting block and the second connecting block in sequence and is fixedly installed on the moving contact end face of the vacuum interrupter.

[0034] Finally, the fixing cover plate is installed on the second connecting block.

[0035] In summary, the sliding strap structure of the present invention, which takes into account both the assembly process of switching equipment and the characteristics of long life, can meet the technical requirements of 250,000 cycles and above, while also being able to adapt to the normal error and accuracy range allowed by the assembly process. It has a simple structure, saves space, is ingenious in method, has high reliability, strong manufacturability and versatility, is convenient to use and maintain, has low cost, and has significant economic benefits.

[0036] It provides strong support for the miniaturization and integration of high-voltage switchgear, significantly reduces the space occupied by the moving contact of the vacuum interrupter and electrical connection, meets the sliding fit accuracy requirements of the watch band contact fingers, and can also adapt to the error range allowed by the assembly structure. The structure and principle are simple, the electrical connection is highly reliable, the mechanical life is long, the maintenance and repair are convenient, the cost is low, the technical advantages are obvious, and it has broad application prospects and considerable economic value.

[0037] Several points should be noted in this invention:

[0038] The moving contact end face of the vacuum interrupter sequentially passes through the first connecting block, the first watchband contact finger, the second connecting block, and the second watchband contact finger to reach the conductive flange, thereby realizing sliding current flow.

[0039] The overall structure consists of two layers of watch strap contact fingers. The second connecting block only contacts the first watch strap contact finger, the second watch strap contact finger, and the guide ring. It has no other fixed constraints and is in a free state within a specified range, ensuring that assembly errors do not affect the fit clearance between the second connecting block and the conductive flange.

[0040] The second strap contact finger has a small gap, low elasticity, and long life precision structure, which is used for large stroke sliding connection. It can guarantee 300,000 mechanical lifespans based on the total stroke of the main circuit breaker of 17mm. The first strap contact finger has a large gap, high elasticity, and multi-point contact structure, which is used for static or small stroke sliding connection and can absorb axial errors caused by assembly.

[0041] The first watch strap finger has at least one finger installed, and the second watch strap finger has at least two fingers installed. The symmetrical structure ensures the stability and reliability of the combined watch strap finger structure.

[0042] At least two guide rings are installed, distributed on both sides of the second watch band contact finger. The height of the guide ring after it is installed on the second connecting block is slightly less than the gap between the second connecting block and the conductive flange, so as to ensure reliable contact and current flow of the second watch band contact finger. The guide ring is made of non-metallic self-lubricating material to avoid jamming.

[0043] Finally, during the assembly process of the combined watch strap touch structure, the fixing cover is installed on the second connecting block, ensuring that after the fixing cover is added, the internal frame size of the second connecting block is greater than the length of the first connecting block.

[0044] The sliding band structure of this invention combines the advantages of switchgear assembly process and long lifespan. Its ingenious structural principle and outstanding practical effect can meet the comprehensive performance requirements of long lifespan, assembly process and current carrying capacity. It has a high degree of miniaturization and integration, and is convenient to use, maintain and repair, and has low cost. It is a breakthrough technology for sliding electrical connection applications and has broad promotion value and market prospects.

[0045] To more clearly demonstrate the technical solution and its effects provided by the present invention, the embodiments of the present invention will be described in detail below with reference to specific examples.

[0046] Example 1

[0047] like Figure 1 As shown:

[0048] The sliding watch strap structure of this invention, which balances the assembly process and long lifespan of switchgear, includes a connecting rod 1, a fixed cover plate 2, a second watch strap contact finger 3, a conductive flange 4, a second connecting block 5, a vacuum interrupter 6, a guide ring 7, a first connecting block 8, and a first watch strap contact finger 9. The connecting rod 1 fixes the first connecting block 8 to the moving contact end face of the vacuum interrupter 6.

[0049] The first strap contact finger 9 is installed between the first connecting block 8 and the second connecting block 5. The fixed cover plate 2 is installed on the second connecting block 5. The second strap contact finger 3 and the guide ring 7 are installed between the second connecting block 5 and the conductive flange 4. The moving contact end face of the vacuum interrupter 6 passes sequentially through the first connecting block 8, the first strap contact finger 9, the second connecting block 5, and the second strap contact finger 3 to reach the conductive flange 4, realizing sliding current flow. In this embodiment, the sliding strap structure is applied to the main circuit breaker of the railway industry, with a mechanical life requirement of 250,000 cycles and a rated current of 1000A. Both the second connecting block 5 and the first connecting block 8 are made of copper.

[0050] The overall structure consists of a two-layer watchband contact finger assembly. The second connecting block 5 only contacts the first watchband contact finger 9, the second watchband contact finger 3, and the guide ring 7, without any other fixed constraints. It is in a free state within a specified range, ensuring that assembly errors do not affect the fit clearance between the second connecting block 5 and the conductive flange 4. In this embodiment, the second connecting block 5 is axially limited by the vacuum interrupter 6, the first connecting block 8, and the fixed cover plate 2, but is not fixedly constrained. Circumferentially, it is in close contact with the first watchband contact finger 9 and the second watchband contact finger 3, respectively.

[0051] The second gauge band contact finger 3 is a precision structure with small gap, low elasticity, and long life, used for large-stroke sliding connections. Based on the main circuit breaker's total stroke of 17mm, it can guarantee a mechanical life of 300,000 cycles. The first gauge band contact finger 9 is a structure with large gap, high elasticity, and multi-point contact, used for static or small-stroke sliding connections, capable of absorbing axial errors caused by assembly. In this embodiment, the second gauge band contact finger 3 requires a 0.5mm clearance between the shaft and sleeve, and the first gauge band contact finger 9 requires a 1mm clearance between the shaft and sleeve. The compressible size of the contact point is 0.8mm, and it has high elasticity. When axial coaxiality deviation occurs during assembly, it can be compensated and absorbed primarily by the elastic compression of the first gauge band contact finger 9.

[0052] At least one first strap contact 9 and at least two second strap contacts 3 are installed. This symmetrical structure ensures the stability and reliability of the combined strap contact structure. In this embodiment, one first strap contact 9 and two second strap contacts 3 are installed, symmetrically on both sides of the first strap contact 9.

[0053] At least two guide rings 7 are installed, distributed on both sides of the second strap contact finger 3. The protrusion of the guide ring 7 after installation on the second connecting block 5 is slightly less than the gap between the second connecting block 5 and the conductive flange 4, ensuring reliable contact and current flow of the second strap contact finger 3. The guide ring 7 is made of a non-metallic self-lubricating material to prevent jamming. In this embodiment, the gap between the second connecting block 5 and the conductive flange 4 is 0.5 mm, the protrusion of the guide ring 7 after installation on the second connecting block 5 is 0.3 mm, and the guide ring 7 is made of polytetrafluoroethylene (PTFE).

[0054] The assembly process of the combined watch strap finger structure is as follows:

[0055] First, after fixing the vacuum interrupter 6 and the conductive flange 4, install the guide ring 7 and the second strap contact finger 3 on the second connecting block 5, and then install them into the conductive flange 4 as a whole.

[0056] Next, the first watch strap contact finger 9 is installed on the first connecting block 8, and then installed as a whole inside the second connecting block 5. The connecting rod 1 passes through the first connecting block 8 and the second connecting block 5 in sequence and is fixedly installed on the moving contact end face of the vacuum interrupter 6.

[0057] Finally, the fixing cover plate 2 is installed on the second connecting block 5, ensuring that after adding the fixing cover plate 2, the internal frame size of the second connecting block 5 is greater than the length of the first connecting block 8. In this embodiment, after installing the fixing cover plate 2, the internal frame size of the second connecting block 5 is 72mm, and the length of the first connecting block 8 is 69mm.

[0058] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of the present invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A sliding watchband structure that combines the assembly process of switching equipment with long lifespan characteristics, characterized in that, It includes a connecting rod, a fixed cover plate, a second watch strap contact finger, a conductive flange, a second connecting block, a vacuum interrupter, a guide ring, a first connecting block, and a first watch strap contact finger; The connecting rod fixes the first connecting block to the moving contact end face of the vacuum interrupter, the first watch strap finger is installed between the first connecting block and the second connecting block, the fixing cover plate is installed on the second connecting block, and the second watch strap finger and the guide ring are installed between the second connecting block and the conductive flange. The moving contact end face of the vacuum interrupter sequentially passes through the first connecting block, the first watchband contact finger, the second connecting block, and the second watchband contact finger to reach the conductive flange for conductive connection; The second connecting block only contacts the first strap contact finger, the second strap contact finger, and the guide ring, and has no other fixed constraints, and is in a free state within a specified range; The second strap contact finger has a small gap, low elasticity, and surface contact structure, used for large-stroke sliding connection; the first strap contact finger has a large gap, high elasticity, and multi-point contact structure, used for static or small-stroke sliding connection. At least one first watch band contact finger is installed, and at least two second watch band contact fingers are installed. At least two guide rings are installed, distributed on both sides of the second strap finger, and the height of the guide ring protruding from the second connecting block is slightly less than the gap between the second connecting block and the conductive flange. The guide ring is made of non-metallic self-lubricating material.

2. The sliding watchband structure according to claim 1, which combines the assembly process of switching equipment with long service life, is characterized in that... The assembly process is as follows: First, after fixing the vacuum interrupter and the conductive flange, install the guide ring and the second watch strap contact finger on the second connecting block, and then install them into the conductive flange as a whole. Secondly, the first watch strap contact finger is installed on the first connecting block, and then the whole assembly is installed inside the second connecting block. The connecting rod passes through the first connecting block and the second connecting block in sequence and is fixedly installed on the moving contact end face of the vacuum interrupter. Finally, the fixing cover plate is installed on the second connecting block.

Images