Solid-sealed polar pole for vacuum circuit breaker

Abstract

The utility model relates to a solid-sealed polar pole for a vacuum circuit breaker, which comprises a shell, a vacuum arc-extinguishing chamber, an upper wire outlet seat, a lower wire outlet seat, a permanent magnetic mechanism and an insulating pull rod assembly, the vacuum arc-extinguishing chamber and the upper wire outlet seat are both arranged in the upper part of the shell, the static end of the vacuum arc-extinguishing chamber is arranged upwards, and the movable end of the vacuum arc-extinguishing chamber is arranged downwards; the upper wire outlet seat is connected with the static end of the vacuum arc-extinguishing chamber, the lower wire outlet seat is installed in the left side part of the shell, the permanent magnetic mechanism is embedded in the lower part of the shell, and the permanent magnetic mechanism is provided with a movable pull rod capable of moving up and down relative to the shell; the upper end of the insulating pull rod assembly is connected with the movable end of the vacuum arc-extinguishing chamber, and the lower end is connected with the upper end of a movable pull rod of the permanent magnetic mechanism. The solid-sealed polar pole for the vacuum circuit breaker not only has a compact structure and can reduce the occupied space of a case, but also can effectively improve the speed of opening and closing actions of the vacuum circuit breaker, thereby ensuring the stability and reliability of the opening and closing actions.

Description

Technical Field

[0001] The utility model relates to the field of electric power equipment, in particular to a sealed pole for a vacuum circuit breaker. Background Art

[0002] As the core component of power distribution line safety, people have higher and higher requirements for the quality and performance of vacuum circuit breakers. The quality of vacuum circuit breakers is mainly reflected in the speed of opening and closing actions, and the opening and closing actions are mostly achieved by operating mechanisms. At present, the operating mechanisms of vacuum circuit breakers mostly use closing spring operating mechanisms, which have the advantages of low cost and long service life. However, due to its numerous parts and complex structure, it not only takes up a large chassis space, but also has many transmission links and slow movements, resulting in a long opening time for vacuum circuit breakers, which can no longer meet the current power system's requirements for rapid opening of vacuum circuit breakers. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a sealed pole for a vacuum circuit breaker, which is not only compact in structure and can reduce the occupied chassis space, but also can effectively improve the opening and closing speed of the vacuum circuit breaker, thereby ensuring the stability and reliability of the opening and closing actions. The technical solution adopted is as follows:

[0004] A sealed pole for a vacuum circuit breaker comprises a shell, a vacuum arc chamber, an upper lead-out seat and a lower lead-out seat, wherein the vacuum arc chamber and the upper lead-out seat are both mounted in the upper portion of the shell, the static end of the vacuum arc chamber is arranged upward, and the dynamic end of the vacuum arc chamber is arranged downward; the upper lead-out seat is connected to the static end of the vacuum arc chamber, and the lower lead-out seat is mounted in the left side portion of the shell, and is characterized in that: the sealed pole for the vacuum circuit breaker also comprises a permanent magnet mechanism and an insulating pull rod assembly, the permanent magnet mechanism is embedded in the lower portion of the shell, and the permanent magnet mechanism has a movable pull rod that can move up and down relative to the shell; the insulating pull rod assembly is mounted in the middle portion of the shell and is located between the vacuum arc chamber and the permanent magnet mechanism, the upper end of the insulating pull rod assembly is connected to the dynamic end of the vacuum arc chamber, and the lower end of the insulating pull rod assembly is connected to the upper end of the movable pull rod of the permanent magnet mechanism.

[0005] The above-mentioned vacuum circuit breaker generally also includes a chassis and a circuit breaker operating mechanism. The vacuum circuit breaker has a sealed pole arranged on the upper side of the chassis. The lower end of the movable pull rod of the permanent magnet mechanism extends from the bottom of the shell into the chassis and is connected to the adjustment end of the locking structure of the circuit breaker operating mechanism. The movable pull rod of the permanent magnet mechanism can move up or down under the drive of the permanent magnet drive module.

[0006] The structure and working principle of the above-mentioned insulating pull rod assembly can refer to the Chinese invention patent specification with publication number CN117690752A. Specifically, the insulating pull rod assembly includes an insulating rod, an upper pull rod, a lower pull rod, and a pull rod spring. The upper pull rod is fixedly connected to the moving contact and moves synchronously. The upper end of the lower pull rod is fixedly connected to the lower end of the insulating rod; a concave hole is provided on the upper part of the insulating rod, and the pull rod spring is located inside the concave hole. A circular cover is provided on the upper part of the concave hole, and the upper pull rod passes through the circular cover; a circular convex rib is formed on the lower section of the upper pull rod, and the circular convex rib is located between the circular cover and the pull rod spring. The upper end of the pull rod spring touches the lower end surface of the circular convex rib, and the lower end of the pull rod spring touches the bottom of the concave hole; the insulating rod and the upper pull rod are located inside the pole, and the lower pull rod is connected to the upper end of the movable pull rod of the permanent magnet mechanism.

[0007] As a preferred embodiment of the utility model, the permanent magnet mechanism includes a static iron core, a permanent magnet, an inner magnetic yoke, a moving iron core, the movable pull rod, an electromagnetic coil and a closing spring, the static iron core is installed in the lower part of the outer shell, the permanent magnet is installed on the static iron core, the inner magnetic yoke is sleeved in the permanent magnet, the moving iron core is arranged on the lower side of the static iron core and can move up and down relative to the static iron core, and the electromagnetic coil is installed on the moving iron core; the static iron core and the moving iron core are respectively provided with a first through hole and a second through hole which are relatively aligned in position, the middle section of the movable pull rod is located in the first through hole and the second through hole, the upper section of the movable pull rod is provided with a limit block, the limit block is located on the upper side of the static iron core and cooperates with the upper end opening edge of the first through hole, and the lower section of the movable pull rod extends to the lower side of the moving iron core; the closing spring is sleeved on the outside of the movable pull rod, and the upper and lower ends of the closing spring are respectively connected to the static iron core and the moving iron core.

[0008] As a preferred embodiment of the utility model, the sealed pole for circuit breaker also includes a flexible connection, the two ends of which are respectively connected to the moving end of the vacuum arc chamber and the lower outlet seat, and the upper outlet seat, the vacuum arc chamber, the flexible connection and the lower outlet seat are electrically connected in sequence to form a conductive circuit.

[0009] As a preferred solution of the utility model, an assembly cavity is provided in the lower part of the shell, and a lower opening communicating with the assembly cavity is provided on the bottom surface of the shell; the permanent magnet mechanism is installed in the assembly cavity through the lower opening. The permanent magnet mechanism is installed in the assembly cavity from the lower opening in an embedded manner, which is convenient to install and can free up space in the chassis, creating conditions for intelligence.

[0010] As a preferred solution of the utility model, the sealed pole for vacuum circuit breaker further includes a current transformer, which is installed in the left side of the housing and outside the lower outlet seat. Specifically, the current transformer can be an electronic current transformer (LPCT), which includes an iron core and a secondary coil evenly wound on the iron core, and the iron core is made of ultra-fine crystal alloy or high-quality silicon steel sheet.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] This type of vacuum circuit breaker uses a sealed pole to install a permanent magnet mechanism in the lower part of the casing in an embedded manner. The movable pull rod of the permanent magnet mechanism can move up and down through the insulating pull rod assembly to drive the moving end of the vacuum interrupter to move upward until the moving end of the vacuum interrupter contacts with its static end, or drive the moving end of the vacuum interrupter to move downward through the insulating pull rod assembly to pull the moving and static contacts apart by a certain distance (opening distance), thereby controlling the opening action of the vacuum circuit breaker. This can not only free up space in the chassis of the vacuum circuit breaker, making the overall structure of the vacuum circuit breaker more compact and creating conditions for intelligence, but also reduce transmission links and effectively improve the opening speed of the vacuum circuit breaker, thereby ensuring the stability and reliability of the opening and closing actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a sealed pole for a vacuum circuit breaker according to a preferred embodiment of the utility model.

[0014] Figure 2 yes Figure 1 The diagram is a structural diagram of a permanent magnet mechanism in a sealed pole for a vacuum circuit breaker in a closed state.

[0015] Figure 3 yes Figure 1 The diagram is a structural diagram of a permanent magnet mechanism in a sealed pole for a vacuum circuit breaker in an open state.

[0016] Figure 4 It contains Figure 1 The structure diagram of the vacuum circuit breaker shown is a vacuum circuit breaker with a sealed pole. DETAILED DESCRIPTION

[0017] like Figure 1-4As shown, the sealed pole 100 for vacuum circuit breaker includes a housing 1, a vacuum interrupter 2, an upper outlet seat 3, a lower outlet seat 4, a flexible connection (not shown in the figure), a permanent magnet mechanism 5 and an insulating pull rod assembly 6. The vacuum interrupter 2 and the upper outlet seat 3 are both installed in the upper part of the housing 1, the static end of the vacuum interrupter 2 is arranged upward, and the dynamic end of the vacuum interrupter 2 is arranged downward; the upper outlet seat 3 is connected to the static end of the vacuum interrupter 2, and the lower outlet seat 4 is installed in the left side of the housing 1; the two ends of the flexible connection are respectively connected to the dynamic end of the vacuum interrupter 2 The upper terminal block 3, the vacuum arc chamber 2, the soft connection and the lower terminal block 4 are electrically connected in sequence to form a conductive circuit; the permanent magnet mechanism 5 is embedded in the lower part of the housing 1, and the permanent magnet mechanism 5 has a movable pull rod 50 that can move up and down relative to the housing 1; the insulating pull rod assembly 6 is installed in the middle part of the housing 1 and is between the vacuum arc chamber 2 and the permanent magnet mechanism 5, the upper end of the insulating pull rod assembly 6 is connected to the moving end of the vacuum arc chamber 2, and the lower end of the insulating pull rod assembly 6 is connected to the upper end of the movable pull rod 50 of the permanent magnet mechanism 5.

[0018] In this embodiment, an assembly cavity 101 is provided in the lower part of the housing 1, and a lower opening 102 communicating with the assembly cavity 101 is provided on the bottom surface of the housing 1; the permanent magnet mechanism 5 is installed in the assembly cavity 101 through the lower opening 102; the permanent magnet mechanism 5 includes a movable pull rod 50, a static iron core 51, a permanent magnet 52, an inner magnetic yoke 53, a moving iron core 54, an electromagnetic coil 55 and a closing spring 56, the static iron core 51 is installed in the assembly cavity 101, the permanent magnet 52 is installed on the static iron core 51, the inner magnetic yoke 53 is sleeved in the permanent magnet 52, and the moving iron core 54 is arranged at the lower side of the static iron core 51 and can move up and down relative to the static iron core 51. The electromagnetic coil 55 is mounted on the moving iron core 54; the first through hole 511 and the second through hole 541 are respectively provided on the static iron core 51 and the moving iron core 54, the middle section of the movable pull rod 50 is located in the first through hole 511 and the second through hole 541, the upper section of the movable pull rod 50 is provided with a limit block 501, the limit block 501 is located on the upper side of the static iron core 51 and matches the upper opening edge of the first through hole 511, and the lower section of the movable pull rod 50 extends to the lower side of the moving iron core 54; the closing spring 56 is sleeved on the outer side of the movable pull rod 50, and the upper and lower ends of the closing spring 56 are respectively connected to the static iron core 51 and the moving iron core 54. The permanent magnet mechanism 5 is installed in the assembly cavity 101 from the lower opening 102 in an embedded manner, which is convenient for installation and can free up space in the chassis, creating conditions for intelligence.

[0019] In this embodiment, the sealed pole 100 for vacuum circuit breaker further includes a current transformer 7, which is installed in the left side of the housing 1 and outside the lower outlet seat 4. The current transformer 7 can be an electronic current transformer 7 (LPCT), which includes an iron core and a secondary coil uniformly wound on the iron core, and the iron core is made of ultra-fine crystal alloy or high-quality silicon steel sheet.

[0020] The working principle of the sealed pole 100 for vacuum circuit breaker is briefly described below:

[0021] The vacuum circuit breaker also includes a chassis 200 and a circuit breaker operating mechanism 300. A plurality of sealed poles 100 are arranged on the upper side of the chassis 200. The lower end of the movable pull rod 50 of the permanent magnet mechanism 5 extends from the bottom of the outer shell 1 into the chassis 200 and is connected to the adjustment end of the circuit breaker operating mechanism 300. The movable pull rod 50 of the permanent magnet mechanism 5 can move up or down under the drive of the permanent magnet drive module 400.

[0022] When it is necessary to control the vacuum circuit breaker to perform a closing action, the permanent magnet drive module 400 passes a current in a specific direction to the electromagnetic coil 55. This current causes it to generate a magnetic field in the lower part of the magnetic circuit in the opposite direction to the permanent magnet 52. The magnetic field force generated by the superposition of the two magnetic fields causes the moving iron core 54 to move upward to reach the target closing position (at this time, the closing current disappears, and the permanent magnet 52 uses the low magnetic impedance channel provided by the moving and static iron cores 51 and the thrust of the closing spring 56 to keep the moving iron core 54 in a stable closing position), and then drives the moving end of the vacuum interrupter 2 to move upward through the insulating pull rod assembly 6 until the moving end of the vacuum interrupter 2 contacts its static end. , the vacuum circuit breaker is closed; when it is necessary to control the vacuum circuit breaker to open, after the permanent magnet drive module 400 passes current in the opposite direction to the electromagnetic coil 55, the current generates a magnetic field on the upper part of the moving iron core that is the same as the magnetic field of the permanent magnet 52, reducing the magnetic attraction on the moving iron core 54, causing it to move downward to reach the target opening position (at this time, the moving iron core 54 is maintained in a stable opening position under the repulsive force of the permanent magnet 52 and the limiting action of the limit block 501), and then the moving end of the vacuum interrupter 2 is driven downward by the insulating pull rod assembly 6, and the moving and static contacts are pulled apart by a distance (opening distance), and the vacuum circuit breaker is opened.

[0023] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The technical personnel of the technical field to which the utility model belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A sealed pole for a vacuum circuit breaker, comprising a housing, a vacuum interrupter, an upper outlet seat and a lower outlet seat, wherein the vacuum interrupter and the upper outlet seat are both installed in the upper part of the housing, the static end of the vacuum interrupter is arranged upward, and the dynamic end of the vacuum interrupter is arranged downward; the upper outlet seat is connected to the static end of the vacuum interrupter, and the lower outlet seat is installed in the left side of the housing, characterized in that: The sealed pole for the vacuum circuit breaker also includes a permanent magnet mechanism and an insulating pull rod assembly. The permanent magnet mechanism is embedded in the lower part of the shell, and the permanent magnet mechanism has a movable pull rod that can move up and down relative to the shell; the insulating pull rod assembly is installed in the middle part of the shell and is located between the vacuum arc chamber and the permanent magnet mechanism, the upper end of the insulating pull rod assembly is connected to the moving end of the vacuum arc chamber, and the lower end of the insulating pull rod assembly is connected to the upper end of the movable pull rod of the permanent magnet mechanism.

2. The sealed pole for vacuum circuit breaker according to claim 1, characterized in that: The permanent magnet mechanism includes a static iron core, a permanent magnet, an inner magnetic yoke, a moving iron core, the movable pull rod, an electromagnetic coil and a closing spring. The static iron core is installed in the lower part of the outer shell, the permanent magnet is installed on the static iron core, the inner magnetic yoke is sleeved in the permanent magnet, the moving iron core is arranged on the lower side of the static iron core and can move up and down relative to the static iron core, and the electromagnetic coil is installed on the moving iron core; the static iron core and the moving iron core are respectively provided with a first through hole and a second through hole which are relatively aligned in position, the middle section of the movable pull rod is located in the first through hole and the second through hole, the upper section of the movable pull rod is provided with a limit block, the limit block is located on the upper side of the static iron core and cooperates with the upper end opening edge of the first through hole, and the lower section of the movable pull rod extends to the lower side of the moving iron core; the closing spring is sleeved on the outside of the movable pull rod, and the upper and lower ends of the closing spring are respectively connected to the static iron core and the moving iron core.

3. The sealed pole for vacuum circuit breaker according to claim 1, characterized in that: An assembly cavity is arranged in the lower part of the shell, and a lower opening communicating with the assembly cavity is arranged on the bottom surface of the shell; the permanent magnet mechanism is installed in the assembly cavity through the lower opening.

4. A sealed pole for a vacuum circuit breaker according to any one of claims 1 to 3, characterized in that: The sealed pole for circuit breaker also includes a flexible connection, the two ends of which are respectively connected to the moving end of the vacuum interrupter and the lower outlet seat, and the upper outlet seat, the vacuum interrupter, the flexible connection and the lower outlet seat are electrically connected in sequence to form a conductive circuit.

5. A sealed pole for a vacuum circuit breaker according to any one of claims 1 to 3, characterized in that: The sealed pole for vacuum circuit breaker further comprises a current transformer, which is installed in the left side of the shell and outside the lower outlet seat.

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