CN-122000233-A - Vacuum contact

CN122000233ACN 122000233 ACN122000233 ACN 122000233ACN-122000233-A

Abstract

The invention discloses a vacuum contact, which comprises a fixed end contact and a moving end contact, wherein the fixed end contact comprises a first transverse magnetic component and a first longitudinal magnetic component, the first transverse magnetic component comprises a first radial arm contact piece and a first conductive rod, the first longitudinal magnetic component is of a hollow structure, the first longitudinal magnetic component is sleeved on the outer peripheral side of the first conductive rod and is in sealing connection with the first conductive rod, the first radial arm contact piece is fixed at one end of the first conductive rod and is in contact with the first longitudinal magnetic component, the moving end contact comprises a second transverse magnetic component and a second longitudinal magnetic component, the second transverse magnetic component comprises a second radial arm contact piece and a second conductive rod, the second radial arm contact piece is fixed at one end of the second conductive rod, the second radial arm contact piece is opposite to the first radial arm contact piece, the second longitudinal magnetic component is of a hollow structure, and the second longitudinal magnetic component is sleeved on the outer peripheral side of the second conductive rod. The invention combines the advantages of two magnetic fields to control the movement and diffusion of the vacuum arc, and improves the breaking capacity of the vacuum contact on the mechanism.

Inventors

LIU JUNXIANG
XIONG JUN
ZHU BO
WANG YONG
HUANG QINGDAN
SU HAIBO
XIAO JUN
GU LE

Assignees

广东电网有限责任公司广州供电局

Dates

Publication Date: 20260508
Application Date: 20260203

Claims (10)

1. A vacuum contact, comprising: The static end contact comprises a first transverse magnetic component and a first longitudinal magnetic component, wherein the first transverse magnetic component comprises a first radial arm contact blade and a first conducting rod, the first longitudinal magnetic component is of a hollow structure, the first longitudinal magnetic component is sleeved on the outer peripheral side of the first conducting rod and is in sealing connection with the first conducting rod, the first radial arm contact blade is fixed at one end of the first conducting rod and is in contact with the first longitudinal magnetic component, and The movable end contact comprises a second transverse magnetic component and a second longitudinal magnetic component, the second transverse magnetic component comprises a second radial arm contact piece and a second conducting rod, the second radial arm contact piece is fixed at one end of the second conducting rod, the second radial arm contact piece and the first radial arm contact piece are oppositely arranged, the second longitudinal magnetic component is of a hollow structure, the second longitudinal magnetic component is sleeved on the outer peripheral side of the second conducting rod, and the second conducting rod is configured to longitudinally move relative to the second longitudinal magnetic component; When the switch is closed, the first radial arm contact blade is contacted with the second radial arm contact blade, and a gap is reserved between the second radial arm contact blade and the second longitudinal magnetic component; When the switch is opened, the second conducting rod drives the second radial arm contact piece to be separated from the first radial arm contact piece and gradually moves to be in contact with the second longitudinal magnetic component.
2. The vacuum contact of claim 1, wherein the first longitudinal magnetic assembly comprises a first fixed conduit, a first double layer longitudinal magnetic coil, a first core, and a first outer ring; The first fixed guide pipe, the first double-layer longitudinal magnetic coil, the first iron core and the first outer ring are all sleeved on the outer periphery side of the first conducting rod, the first fixed guide pipe is in sealing connection with the first conducting rod, two ends of the first double-layer longitudinal magnetic coil are respectively connected with the first fixed guide pipe and the first outer ring, the first iron core is fixed on the inner wall of the first double-layer longitudinal magnetic coil and is nested between the first outer ring and the first fixed guide pipe, and the first outer ring is in contact with the first radial arm contact piece; The second longitudinal magnetic assembly comprises a second fixed guide pipe, a second double-layer longitudinal magnetic coil, a second iron core and a second outer ring; The second fixed conduit, the second double-layer longitudinal magnetic coil, the second iron core and the second outer ring are all sleeved on the outer periphery side of the second conducting rod, the second fixed conduit is in sliding connection with the second conducting rod, two ends of the second double-layer longitudinal magnetic coil are respectively connected with the second fixed conduit and the second outer ring, the second iron core is fixed on the inner wall of the second double-layer longitudinal magnetic coil and is nested between the second outer ring and the second fixed conduit, and the second outer ring is configured to form a gap with the second radial arm contact piece or contact with the second radial arm contact piece.
3. The vacuum contact of claim 2, wherein the first radial arm contact blade has a structure identical to the second radial arm contact blade, the first radial arm contact blade comprising a first main contact blade and three first outer contact blades equidistantly spaced about an axis of the first main contact blade to form a fan blade structure; The outer edge shape of the first outer contact is matched with the inner edge shape of the first outer ring.
4. A vacuum contact according to claim 2 or 3, wherein the first radial arm contact blade and the second radial arm contact blade are each made of CuCr50 material.
5. The vacuum contact of claim 2, wherein the first double layer longitudinal magnetic coil and the second double layer longitudinal magnetic coil are each 2/3 turn coils.
6. The vacuum contact of claim 2 or 5, wherein the first double layer longitudinal magnetic coil, the second double layer longitudinal magnetic coil, the first conductive rod, the second conductive rod, the first fixed conduit, and the second fixed conduit are all made of oxygen-free copper material.
7. The vacuum contact of claim 2, wherein the first core has a structure identical to the structure of the second core, and the first core has a grid-like structure.
8. The vacuum contact of claim 7, wherein the diameter of the first core decreases progressively in a direction away from the first outer ring.
9. The vacuum contact of claim 2 or 7, wherein the first core and the second core are made of pure iron.
10. The vacuum contact of claim 2, wherein the first outer ring has a structure identical to that of the second outer ring, the first outer ring includes three ring bodies, the three ring bodies are disposed at intervals around the axis of the first conductive rod, and an interval is provided between two adjacent ring bodies.

Description

Vacuum contact Technical Field The invention relates to the technical field of vacuum circuit breakers, in particular to a vacuum contact. Background The vacuum circuit breaker is a key device for protecting a circuit in a high-voltage power system, and can cut off the circuit in a short time so as to avoid the damage of overload or short circuit to the device, in recent years, with the high-speed increase of economic construction of China, the demand for electric power is more vigorous, the capacity of a generator set is increased year by year, and the short circuit current is increased, so that the vacuum arc-extinguishing chamber is required to have stronger breaking capability. At present, the improvement of the breaking capacity is mainly realized by controlling the electric arc through a magnetic field, and the magnetic field is mainly generated by a contact structure in the working process. At present, the vacuum arc-extinguishing chamber mainly comprises two main types of transverse magnetic contacts and longitudinal magnetic contacts, wherein the transverse magnetic contacts drive an electric arc to rotate between electrodes through a transverse magnetic field, so that local ablation on the contact surface is slowed down. The longitudinal magnetic field generated by the longitudinal magnetic contact can maintain the diffusion state of the electric arc, and reduce the arc voltage and the arc energy, thereby improving the switching efficiency. The longitudinal magnetic contact mainly comprises a coil and a cup-shaped contact, wherein the coil-shaped contact can provide a strong longitudinal magnetic field and improve the opening and closing capability, but has high resistance, serious heating and possibly serious ablation, and the cup-shaped contact provides a small longitudinal magnetic field strength and has weak arc control capability. The transverse magnetic contact mainly comprises a spiral groove, a cup-shaped groove and a Chinese character 'wan' groove, and can provide a stronger transverse magnetic field to drive the arc to move, but maintains the unstable arc diffusion form, has larger energy flow density of the arc and is unfavorable for the arc to be opened and closed. The current contact structures all adopt a single magnetic field to control the arc diffusion, and the problems caused by the single magnetic field contact cannot be avoided. If the arc diffusion speed of the longitudinal magnetic contact is slow, the transverse magnetic contact is not suitable for large-current break. Disclosure of Invention The invention aims to solve the technical problems that the current contact structure adopts a single magnetic field to control the arc diffusion and the problems caused by the single magnetic field contact cannot be avoided. If the arc diffusion speed of the longitudinal magnetic contact is slow, the transverse magnetic contact is not suitable for large-current break. In order to solve the above technical problems, the present invention provides a vacuum contact, including: The static end contact comprises a first transverse magnetic component and a first longitudinal magnetic component, wherein the first transverse magnetic component comprises a first radial arm contact blade and a first conducting rod, the first longitudinal magnetic component is of a hollow structure, the first longitudinal magnetic component is sleeved on the outer peripheral side of the first conducting rod and is in sealing connection with the first conducting rod, the first radial arm contact blade is fixed at one end of the first conducting rod and is in contact with the first longitudinal magnetic component, and The movable end contact comprises a second transverse magnetic component and a second longitudinal magnetic component, the second transverse magnetic component comprises a second radial arm contact piece and a second conducting rod, the second radial arm contact piece is fixed at one end of the second conducting rod, the second radial arm contact piece and the first radial arm contact piece are oppositely arranged, the second longitudinal magnetic component is of a hollow structure, the second longitudinal magnetic component is sleeved on the outer peripheral side of the second conducting rod, and the second conducting rod is configured to longitudinally move relative to the second longitudinal magnetic component; When the switch is closed, the first radial arm contact blade is contacted with the second radial arm contact blade, and a gap is reserved between the second radial arm contact blade and the second longitudinal magnetic component; When the switch is opened, the second conducting rod drives the second radial arm contact piece to be separated from the first radial arm contact piece and gradually moves to be in contact with the second longitudinal magnetic component. Further, the first longitudinal magnetic component comprises a first fixed guide pipe, a first double-layer longitudinal magnetic