CN2796070Y

CN2796070Y - Vacuum arc-extinguish room

Info

Publication number: CN2796070Y
Application number: CN 200520034035
Authority: CN
Inventors: 陈军平; 王强; 邓红江; 田志强; 刘继君
Original assignee: CHENGDU XUGUANG ELECTRONICS Co Ltd
Current assignee: CHENGDU XUGUANG ELECTRONICS Co Ltd
Priority date: 2005-04-28
Filing date: 2005-04-28
Publication date: 2006-07-12
Anticipated expiration: 2015-04-28

Abstract

The utility model relates to a vacuum arc-extinguishing chamber. An end plate of a container (1) is connected with a static conductive rod (2), and the other end plate is connected with a corrugated pipe (3) in the container. A movable conductive rod (4) is positioned in the corrugated pipe (3), the static conductive rod is connected with a static contact (5), and the movable conductive rod is connected with a movable contact (6). The contact disks (7) of the movable contact and the static contact are respectively connected with two ferromagnetic blocks (8), and the conductive rods are positioned between the gaps of the two ferromagnetic blocks. An included angle formed between the gaps of the ferromagnetic blocks on the movable contact and the static contact is between 75 DEG and 105 DEG, the contact disks (7) of the movable contact and the static contact are respectively provided with two parallel through grooves (9), and the included angle between the through grooves (9) on the contact disks (7) of the movable contact and the static contact is between 75 DEG and 105 DEG.

Description

Vacuum interrupter

Technical field:

The utility model is relevant with electric power switch unit.

Background technology:

Vacuum circuit-breaker is a kind of power switchgear, it is by two contact contact and relative motions in a vacuum, can close and close, carry, cut-off the operating loop normal current, also can close the overload current (comprising short circuit current) that closes, carries and cut-off regulation at the appointed time.Vacuum interrupter then is the core component of vacuum circuit-breaker, and it is around the contact of switch, in order to restriction vacuum arc locus and quicken the device of arc extinction.

The shell of vacuum interrupter is made by insulating material, a closed container is formed with the metal cover board sealing-in in two ends, there is a pair of contact inside, fixed contact is fixed on the static conductive rod, moving contact is fixed on the moving conductive rod, owing to be sealed with bellows between moving conductive rod and the metal cover board, so thereby moving conductive rod can move vertically and drives contact and finish branch, close action.The vacuum extinction chamber interior is a high vacuum, when dynamic and static contact under the operating mechanism effect during charged separation, the vacuum arc of burning between contact, arc extinction when current over-zero.Because the special tectonic of contact, the magnetic field that can produce certain orientation makes electric arc be evenly distributed on contact surface, thereby reduces the galvano-cautery speed of arc energy and contact, and makes vacuum interrupter have dielectric strength resume speed behind the higher arc.

The structure of contact terminal of common vacuum interrupter adopts coil type more, especially uses more with the vertical magnetic structure of contact terminal of cup-shaped.The vertical magnetic contact of cup-shaped is to rely on some tippers of the contact cup behind the contact dish to produce longitudinal magnetic field, the contact cup that has 6 tippers as shown in Figure 2, the shortcoming of this structure of contact terminal is that structural strength is relatively poor, the fluting corner is big, the centre must add bracing or strutting arrangement; Current path is long, and loop resistance is bigger.

The utility model content:

The purpose of this utility model provides a kind of simple in structure, the intensity height, and loop resistance is low, the vacuum interrupter that connecting-disconnecting function is strong.

The utility model is achieved in that

The utility model vacuum interrupter, one end plate of container 1 is connected with static conductive rod 2, bellows 3 in another end plate and the container is connected, moving conductive rod 4 is positioned at bellows 3, static conductive rod is connected with fixed contact 5, moving conductive rod is connected with moving contact 6, respectively be connected with two ferromagnetic block 8 on the contact dish 7 of dynamic and static contact, conducting rod is between the gap of two ferromagnetic block, ferromagnetic block gap on the dynamic and static contact becomes 75-105 ° of angle, two parallel channels 9 are respectively arranged, 9 one-tenth 75-105 of the groove ° angle on the dynamic and static contact dish on the dynamic and static contact dish 7.

The angle of groove is 90 ° on angle between the ferromagnetic block gap on the above-mentioned dynamic and static contact and the contact dish.

The distance of two ferromagnetic block on the above-mentioned contact dish is greater than two contact disc thicknesses and specified clearance between open contacts sum.

Above-mentioned ferromagnetic block 8 is overlapped by some vertical or horizontal laminations.

Above-mentioned ferromagnetic block 8 is made of vertical lamination 10, and the cross section of lamination 10 is a circular arc, its axial line and vacuum interrupter parallel axes, and its arc length increases progressively from inside to outside.

Above-mentioned ferromagnetic block 8 is made of horizontal lamination 11, the plane of lamination 11 and vacuum interrupter axis normal, the area of every lamination with the distance of contact dish from the near to the remote and by greatly gradually little.

The utility model produces longitudinal magnetic field jointly by the system that is made up of contact dish groove and magnetic circuit, and magnetic circuit is made of ferromagnetic material, and its outside is surrounded by the stainless steel cover, and ferromagnetic material is positioned at the back of contact dish, the size of its control magnetic flux.Ferromagnetic block on dynamic and static two contacts becomes 90 ° of layouts mutually, and the groove on the two contact dishes also becomes 90 ° of distributions mutually.In the path of the magnetic line of force, magnetic flux passes two contact gaps four times, thereby produce one four utmost point longitudinal magnetic field, groove structure on the contact dish makes the part electric current form ring again, strengthened magnetic field intensity, the structure of this novel contact and operation principle such as Fig. 4, Fig. 5, in this contact system, four parts that magnetic flux density in the two contact gaps is different in the zone, identical and the direction difference of magnetic flux density separately, intersection's magnetic flux density at them is zero, and is stronger relatively in section axial magnetic field, the outer of contact.

The utility model is compared with the contact of conventional vacuum arc control device, this contact need not coil can produce longitudinal magnetic field, this is its great advantage, therefore in "on" position, electric current can directly flow through conducting rod and contact, loop resistance is low, and the vacuum interrupter of having avoided being used for high-current on-off disperses heat with higher cost.In addition, because the longitudinal magnetic field that this structure of contact terminal produces is strong and even, electric arc presents disperse state under higher current density, make that contact surface is fully effectively utilized, the short circuit current connecting-disconnecting function is stronger under certain condition, thereby make vacuum arc extinguish chamber structure more compact, it is more reasonable to design.

Description of drawings:

Fig. 1 is a structure chart of the present utility model.

Fig. 2 is the structure of contact terminal figure of background technology.

Fig. 3 is the vertical view of Fig. 2.

Fig. 4 is dynamic and static structure of contact terminal figure of the present utility model.

Fig. 5 is the schematic diagram of removing stainless steel cage of Fig. 4.

Fig. 6 is vertical laminate shape figure.

Fig. 7 is the vertical view of Fig. 6.

Fig. 8 is horizontal laminate shape figure.

Fig. 9 is the vertical view of Fig. 8.

Embodiment:

Container 1 of the present utility model is made of the metal end plate 13 at ceramic package 12 and two ends thereof.Dynamic and static contact 6,5 is positioned at the shielding cylinder 14 of container 1.Dynamic and static contact is made of contact dish 7 and stainless steel cage 15, be fixed with two ferromagnetic block 8 on the contact dish, conducting rod is positioned at the gap of two ferromagnetic block 8, ferromagnetic block gap on the dynamic and static contact becomes 90 ° of angles, two parallel channels 9 are respectively arranged, 9 one-tenth 90 ° of angles of the groove on the dynamic and static contact dish on the dynamic and static contact dish 7.

For guaranteeing between two contact dishes enough longitudinal magnetic fields are arranged, the distance of two ferromagnetic block behind each contact dish should be greater than two contact disc thicknesses and specified clearance between open contacts sum, and under the service conditions of alternating current, the existence of ferromagnetic block can produce bigger eddy current.Behind arc extinction, though the electric current in the electrode disappears simultaneously, the remnant field that still exists eddy current to produce between contact, this remnant field will stop the residue plasma to diffusion all around, thereby hinder the rapid recovery of dielectric strength, be unfavorable for cut-offfing of electric current.The way that reduces eddy current is that ferromagnetic block is divided into some, and overlapping then, the lamination number is many more, and the vortex density maximum is more little in the ferromagnetic block, but should note pressing too tightly between the lamination, otherwise eddy current has perforation in some place between the ferromagnetic block lamination.

The lamination mode has two kinds, vertically lamination 10 and laterally lamination 11, and its schematic diagram is seen Fig. 6 and Fig. 8.Vertically the cross section of every lamination of lamination all is circular-arc, the axial line of lamination circular arc and vacuum interrupter parallel axes, and arc length increases progressively from inside to outside, and width is decided according to the longitudinal magnetic field size of need generation.The laterally plane and the vacuum interrupter axis normal of lamination, the area of every lamination with the distance of contact dish from the near to the remote and by greatly gradually little.The principle that lamination is arranged is to make the magnetic line of force space segment that passes between two contacts as much as possible.

Claims

1, vacuum interrupter, one end plate of container (1) is connected with static conductive rod (2), bellows (3) in another end plate and the container is connected, moving conductive rod (4) is positioned at bellows (3), static conductive rod is connected with fixed contact (5), moving conductive rod is connected with moving contact (6), it is characterized in that moving, respectively be connected with two ferromagnetic block (8) on the contact dish (7) of fixed contact, conducting rod is between the gap of two ferromagnetic block, moving, ferromagnetic block gap on the fixed contact becomes 75-105 ° of angle, moving, two parallel channels (9) are respectively arranged on the stationary contact cephalic disc (7), moving, groove on the stationary contact cephalic disc (9) becomes 75-105 ° of angle.

2, vacuum interrupter according to claim 1 is characterized in that the angle between the groove all is 90 ° on angle between the ferromagnetic block gap on the dynamic and static contact and the two contact dishes.

3, vacuum interrupter according to claim 1, the distance that it is characterized in that two ferromagnetic block on the contact dish is greater than two contact disc thicknesses and specified clearance between open contacts sum.

4, vacuum interrupter according to claim 1 is characterized in that ferromagnetic block (8) is overlapped by some vertical or horizontal laminations.

5, vacuum interrupter according to claim 4 is characterized in that ferromagnetic block (8) is made of vertical lamination (10), and the cross section of lamination (10) is a circular arc, its axial line and vacuum interrupter parallel axes, and its arc length increases progressively from inside to outside.

6, vacuum interrupter according to claim 4, it is characterized in that ferromagnetic block (8) is made of horizontal lamination (11), the plane of lamination (11) and vacuum interrupter axis normal, the area of every lamination with the distance of contact dish from the near to the remote and by greatly gradually little.