Vacuum circuit breaker closing buffer

Abstract

The invention relates to a closing buffer of a vacuum circuit breaker. The closing buffer comprises phase columns, a cross beam, a spring operating mechanism and a bracket, the three phase columns are arranged at the top end of the cross beam in parallel, and the top end of the support is connected to the lower surface of the cross beam and used for supporting the cross beam. The spring operating mechanism is mounted on the lower surface of the cross beam, and the spring operating mechanism is linked with the vacuum arc extinguish chamber in the phase column through a transmission module; through specially designed guiding and spring contact force values, functional requirements of guiding and contact pressure providing are realized. A closing buffer is additionally arranged in the spring contact, damping of a rigid closing point is increased through the buffer, energy of collision bounce of the rigid closing point is absorbed, and therefore bounce is restrained.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum circuit breakers, and in particular to a closing buffer for a vacuum circuit breaker. Background Art

[0002] The design of the contact pressure structure of the vacuum circuit breaker is currently a spring structure. According to the current patent "A Vacuum Circuit Breaker" patent number 201810765526.7, it adopts a spring cylinder structure, which is fixedly connected to the lower support seat to achieve guidance and provide contact pressure. The spring cylinder structure of the flat high design is relatively complex. Our company adopts the contact spring structure without the spring cylinder structure, which is relatively simple in design and realizes the function of contact pressure.

[0003] The closing bounce of vacuum circuit breakers is required to be controlled within the range of ≤3ms, which has always been a difficult problem in the industry. Closing bounce is related to the transmission structure, transmission quality, transmission gap, and closing synchronization of the contacts. At present, the transmission structure of the vacuum circuit breaker shaft and the crank arm generally adopts the spring contact solution, which is prone to contact bounce, difficult to debug and match, and low debugging efficiency. As the voltage level increases, the pressure of the contact becomes greater, and the bounce becomes more difficult to control. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a vacuum circuit breaker closing buffer, which can solve the problems that the transmission structure of the vacuum circuit breaker shaft and the crank arm generally adopts a spring contact solution, which is prone to contact bounce, difficult debugging and matching, and low debugging efficiency.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a vacuum circuit breaker closing buffer, comprising a phase column, a beam, a spring operating mechanism and a bracket; the phase column has three and mutually parallel arranged on the top of the beam, the top of the bracket is connected to the lower surface of the beam for supporting the beam; the spring operating mechanism is installed on the lower surface of the beam, and the spring operating mechanism is linked with the vacuum interrupter in the phase column through a transmission module; its innovation lies in: The phase column comprises an outer shell, an upper support seat and a vacuum interrupter; the outer shell is a cylindrical structure, and an umbrella skirt is arranged on the outer contour of the outer shell in the vertical direction; the upper support seat is arranged at the top of the outer shell, and is used to install the vacuum interrupter; the vacuum interrupter is installed in the outer shell and fixed to the bottom end of the upper support seat, and the bottom end of the upper support seat is provided with a static contact extending into the vacuum interrupter; The transmission module includes an inner crank arm, an insulating pull rod and a closing buffer; the inner crank arm is installed in the cross beam, and one end of the inner crank arm is connected to the output end of the spring operating mechanism, and the other end of the inner crank arm is connected to the insulating pull rod; the other end of the insulating pull rod is connected to the closing buffer; a spring contact is arranged at the top of the closing buffer, and the spring contact extends into the vacuum interrupter and is driven by the insulating pull rod to cooperate with the static contact; The closing buffer comprises an upper joint, a lower joint, an upper tray, a lower tray, a spring and a buffer; the top of the upper joint is connected to the spring contact through a pin shaft, the upper joint is a hollow cylindrical structure, and a waist-shaped through groove is provided on the outer wall of the upper joint along the vertical direction; the upper tray is disc-shaped and fixedly arranged at the bottom end of the upper joint, and the upper tray is connected to the upper joint; the lower joint is a hollow cylindrical structure, and a connecting thread is provided on the inner wall of the lower joint; the lower tray is arranged at the top end of the lower joint, and the lower tray is connected to the lower joint; the spring is arranged between the upper tray and the lower tray; the buffer is in the shape of a stepped shaft, and the outer contour of the buffer near the bottom end is connected to the connecting thread of the lower joint through a thread, and a pin shaft hole is provided at a position near the top of the buffer perpendicular to the axial direction, and the pin shaft hole is connected to the waist-shaped through groove of the upper joint through a connecting pin.

[0006] Furthermore, the closing buffer is in the opening position of the circuit breaker before closing. During the closing process, the spring contact is driven by the insulating pull rod to move upward as a whole until it is just closed. When it reaches the just closed position, the upper joint, the connecting pin and the upper tray stop moving, and the spring contact continues to be driven by the insulating pull rod, and the lower tray, the buffer and the lower joint continue to move upward. At this time, the spring is compressed, and the buffer is compressed by the connecting pin to absorb the driving energy of the insulating pull rod. As the closing process progresses, the buffer continues to be compressed until it reaches the fully closed position.

[0007] The advantages of the present invention are: 1) In the present invention, the guiding and contact pressure providing functional requirements are achieved by specially designed guiding and spring contact force values; a closing buffer is added inside the spring contact, and the damping of the rigid closing point is increased through the buffer to absorb the energy of the rigid closing point collision and bounce, thereby suppressing the generation of bounce. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0009] Figure 1 The invention discloses a closing buffer structure for a vacuum circuit breaker.

[0010] Figure 2 The figure is a diagram showing the internal structure of a closing buffer of a vacuum circuit breaker according to the present invention.

[0011] Figure 3 This is a structural diagram of the closing buffer and opening state of a vacuum circuit breaker of the present invention.

[0012] Figure 4 The present invention is a structural diagram of the closing state of a vacuum circuit breaker closing buffer. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] like Figures 1 to 4 A vacuum circuit breaker closing buffer is shown, comprising a phase column 1, a crossbeam 2, a spring operating mechanism 3 and a bracket 4; the phase column 1 has three springs which are arranged parallel to each other on the top of the crossbeam, and the top of the bracket 4 is connected to the lower surface of the crossbeam 2 for supporting the crossbeam 2; the spring operating mechanism 3 is installed on the lower surface of the crossbeam 2, and the spring operating mechanism 3 is linked to the vacuum interrupter in the phase column 1 through a transmission module 5.

[0016] The phase column 1 includes an outer shell 11, an upper support seat 12 and a vacuum arc chamber 13; the outer shell 11 is a cylindrical structure, and an umbrella skirt is arranged on the outer contour of the outer shell 11 along the vertical direction; the upper support seat 12 is arranged at the top of the outer shell, and is used to install the vacuum arc chamber 13; the vacuum arc chamber 13 is installed in the outer shell 11 and fixed at the bottom end of the upper support seat 12, and the bottom end of the upper support seat 12 is provided with a static contact extending into the vacuum arc chamber 13.

[0017] The transmission module 5 includes an inner bend arm 51, an insulating pull rod 52 and a closing buffer 53; the inner bend arm 51 is installed in the crossbeam, and one end of the inner bend arm 51 is connected to the output end of the spring operating mechanism 3, and the other end of the inner bend arm 51 is connected to the insulating pull rod 52; the other end of the insulating pull rod 52 is connected to the closing buffer 53; a spring contact is provided at the top of the closing buffer 53, and the spring contact extends into the vacuum arc chamber 13 and is driven by the insulating pull rod 52 to cooperate with the static contact.

[0018] The closing buffer 53 includes an upper joint 54, a lower joint 55, an upper tray 56, a lower tray 57, a spring 58 and a buffer 59; the top of the upper joint 54 is connected to the spring contact through a pin shaft, the upper joint 54 is a hollow cylindrical structure, and a waist-shaped through groove is arranged on the outer wall of the upper joint 54 along the vertical direction; the upper tray 56 is disc-shaped and fixedly arranged at the bottom end of the upper joint 54, and the upper tray 56 is connected to the upper joint 54; the lower joint 55 is a hollow cylindrical structure, and a connecting thread is arranged on the inner wall of the lower joint 55; the lower tray 57 is arranged at the top end of the lower joint, and the lower tray 57 is connected to the lower joint 55; the spring 58 is arranged between the upper tray 56 and the lower tray 57; the buffer 59 is in the shape of a stepped shaft, and the outer contour of the buffer 58 near the bottom end is connected to the connecting thread of the lower joint through a thread, and a pin shaft hole is arranged at a position near the top end of the buffer 58 perpendicular to the axial direction, and the pin shaft hole is connected to the waist-shaped through groove of the upper joint 54 through a connecting pin 6.

[0019] The working principle of the present invention is as follows: the circuit breaker is in the open position before closing. During the closing process, the spring contact is driven by the insulating pull rod to move upward as a whole until it is just closed. When it reaches the just closed position, the upper joint, the connecting pin and the upper tray stop moving, and the spring contact continues to be driven by the insulating pull rod, and the lower tray, the buffer and the lower joint continue to move upward. At this time, the spring is compressed, and the buffer is compressed by the connecting pin to absorb the driving energy of the insulating pull rod. As the closing process progresses, the buffer continues to be compressed until it reaches the fully closed position.

[0020] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A vacuum circuit breaker closing buffer, comprising a phase column, a crossbeam, a spring operating mechanism and a bracket; the phase column has three and mutually parallel arranged on the top of the crossbeam, the top of the bracket is connected to the lower surface of the crossbeam for supporting the crossbeam; the spring operating mechanism is installed on the lower surface of the crossbeam, and the spring operating mechanism is linked with the vacuum interrupter in the phase column through a transmission module; characterized in that: The phase column comprises an outer shell, an upper support seat and a vacuum interrupter; the outer shell is a cylindrical structure, and an umbrella skirt is arranged on the outer contour of the outer shell in the vertical direction; the upper support seat is arranged at the top of the outer shell, and is used to install the vacuum interrupter; the vacuum interrupter is installed in the outer shell and fixed to the bottom end of the upper support seat, and the bottom end of the upper support seat is provided with a static contact extending into the vacuum interrupter; The transmission module includes an inner crank arm, an insulating pull rod and a closing buffer; the inner crank arm is installed in the cross beam, and one end of the inner crank arm is connected to the output end of the spring operating mechanism, and the other end of the inner crank arm is connected to the insulating pull rod; the other end of the insulating pull rod is connected to the closing buffer; a spring contact is arranged at the top of the closing buffer, and the spring contact extends into the vacuum interrupter and is driven by the insulating pull rod to cooperate with the static contact; The closing buffer comprises an upper joint, a lower joint, an upper tray, a lower tray, a spring and a buffer; the top of the upper joint is connected to the spring contact through a pin shaft, the upper joint is a hollow cylindrical structure, and a waist-shaped through groove is provided on the outer wall of the upper joint along the vertical direction; the upper tray is disc-shaped and fixedly arranged at the bottom end of the upper joint, and the upper tray is connected to the upper joint; the lower joint is a hollow cylindrical structure, and a connecting thread is provided on the inner wall of the lower joint; the lower tray is arranged at the top end of the lower joint, and the lower tray is connected to the lower joint; the spring is arranged between the upper tray and the lower tray; the buffer is in the shape of a stepped shaft, and the outer contour of the buffer near the bottom end is connected to the connecting thread of the lower joint through a thread, and a pin shaft hole is provided at a position near the top of the buffer perpendicular to the axial direction, and the pin shaft hole is connected to the waist-shaped through groove of the upper joint through a connecting pin.

2. A vacuum circuit breaker closing buffer according to claim 1, characterized in that: The closing buffer is such that the circuit breaker is in the opening position before closing. During the closing process, the spring contact is driven by the insulating pull rod to move upward as a whole until it is just closed. When it reaches the just closed position, the upper joint, the connecting pin and the upper tray stop moving, and the spring contact continues to be driven by the insulating pull rod, and the lower tray, the buffer and the lower joint continue to move upward. At this time, the spring is compressed, and the buffer is compressed by the connecting pin to absorb the driving energy of the insulating pull rod. As the closing process progresses, the buffer continues to be compressed until it reaches the fully closed position.

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