CN111584293A

CN111584293A - Contact system of direct current quick circuit breaker

Info

Publication number: CN111584293A
Application number: CN201910425388.2A
Authority: CN
Inventors: 江阳; 黄依婷; 涂勇
Original assignee: Hangzhou Derrida Electric Co ltd
Current assignee: Hangzhou Derrida Electric Co ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-08-25
Anticipated expiration: 2039-05-21
Also published as: CN111584293B

Abstract

The invention discloses a contact system of a direct current quick circuit breaker, which comprises a static conductive bar, a static contact assembly, a dynamic conductive bar, a dynamic contact, a flexible connecting assembly, a fixed bar, a backflow bar, a spiral arc striking bar assembly and a separating spring assembly.

Description

Contact system of direct current quick circuit breaker

Technical Field

The invention relates to a component of medium and low voltage direct current power transmission and distribution equipment, in particular to a contact system of a direct current quick circuit breaker.

Background

The contact system is an actuating mechanism for opening and closing actions of the circuit breaker, and needs to have reliable opening and closing actions, sufficient electric and thermal stability and good mechanical wear resistance and electric wear resistance; when a direct current system has a short-circuit fault, the peak value of short-circuit current can often reach hundreds of kiloamperes, if the short-circuit current cannot be quickly cut off, an electric arc is elongated and enters an arc extinguishing chamber to be quickly extinguished, and the existence of the electric arc can seriously ablate moving and static contacts, even cause fusion welding, cause permanent damage to a circuit breaker and cause failure of breaking and breaking; when the critical direct current of the breaker is cut off, if the generated electromotive force is insufficient, the electric arc is difficult to drive to enter the arc extinguish chamber, the electric arc is continuously burnt between the moving contact and the static contact all the time, and the moving contact and the static contact can be ablated and welded.

Disclosure of Invention

The present invention is directed to a contact system of a dc fast circuit breaker, which solves the above problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a contact system of direct current quick circuit breaker, including static conductive row, the static contact subassembly, move conductive row, the moving contact, soft coupling assembling, the fixed row, the backward flow is arranged, spiral striking row subassembly and separating brake spring subassembly, static conductive row and spiral striking row subassembly are located the both sides above moving conductive row respectively, static contact subassembly passes through bolt locking on static conductive row, the moving contact makes it can swing between static contact subassembly and spiral striking row subassembly through the round pin epaxial articulated being fixed in moving conductive row, the moving contact is provided with through the soft coupling assembling that the fixed row compressed tightly on moving conductive row with the bilateral symmetry of moving conductive row junction, the both sides of spiral striking row subassembly all link to each other with moving conductive row through the backward flow row, the lower extreme sphere pair of separating brake spring subassembly and moving contact is connected.

Preferably, for the contact system of the direct current fast circuit breaker, the static contact component is composed of a conductive block, a static contact silver point and a rear arc striking row which are welded.

Preferably, for direct current quick circuit breaker's contact system, soft coupling assembling including be the first electrically conductive row of triangular distribution, the second electrically conductive row and the third electrically conductive row, wherein, the first electrically conductive row and the third electrically conductive row respectively with the second electrically conductive row between weave the soft copper structure that the stack formed through multilayer copper, soft copper structure is the arch, whole soft coupling assembling is the M type, all be equipped with the step groove on the first electrically conductive row, the second electrically conductive row and the third electrically conductive row, the connection end of soft copper structure and each electrically conductive row all compresses tightly through the copper pipe, adopt to braze between copper pipe terminal surface and the bottom surface in step groove to link firmly, the gap of copper pipe and step department border in step groove is filled through brazing.

Preferably, for the contact system of the dc fast breaker, the first conducting bar and the third conducting bar are both provided with first round holes for facilitating connection with the moving contact, and the second conducting bar is provided with second round holes for facilitating connection with the moving contact.

Preferably, for the contact system of the direct current fast breaker, the spiral arc striking bank component comprises a front arc striking bank arranged on the opposite side of the static conducting bank along the extension line direction of the static conducting bank, the left side and the right side of the lower end part of the front arc striking bank are connected with a left spiral row and a right spiral row which are symmetrical, the outer sides of the left spiral row and the right spiral row are respectively welded with a fourth conducting bank, and the fourth conducting bank is connected with the movable conducting bank through a backflow bank.

Preferably, for the contact system of the direct current fast breaker, the opening spring assembly comprises a ball head ejector rod, a guide cylinder, an opening spring, a ball head shaft sleeve and a concave spherical washer, the guide cylinder is sleeved on the ball head ejector rod and fixedly connected with the ball head ejector rod to form a hollow shaft structure, the opening spring penetrates through the ball head ejector rod and is pressed into the guide cylinder, the plane end of the ball head shaft sleeve penetrates through the ball head ejector rod and is pressed into the guide cylinder to compress the opening spring, and the spherical end of the ball head shaft sleeve is connected with the concave spherical washer.

Compared with the prior art, the invention has the beneficial effects that:

1. the magnetic blow-out current path is formed by the static conducting bar, the rear arc striking bar, the front arc striking bar, the left spiral bar, the right spiral bar, the backflow bar and the movable conducting bar, and when fault current of the circuit breaker flows through the current path, the generated magnetic blow-out effect can form an arc-drawing effect on electric arc of the fault current, so that the electric arc of the fault current can enter the arc extinguishing chamber to extinguish arc more quickly, and the aim of quick breaking is fulfilled.

2. The moving contact and the moving conducting bar are connected through the flexible connecting component, the flexibility of the flexible connection is utilized, the flexible and non-blocking rotation of the front and the back of the moving contact is facilitated, the conducting lapping surface can be reduced through the connection mode, the conducting area is increased, the loop resistance is reduced, and the good and reliable conductivity is facilitated.

3. The copper of soft coupling assembling is woven and is adopted step groove and copper pipe complex mode to compress tightly rather than each leading electrical drainage, all welded fastening in terminal surface and week along department, has fine connection reliability.

4. The moving contact and the opening spring assembly are connected through a spherical pair, the structure is flexible, and the opening spring is sealed in the guide cylinder through a ball head shaft sleeve to form a closed dustproof structure.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic structural view of a flexible connection assembly according to the present invention;

FIG. 4 is a schematic structural view of a stationary contact assembly according to the present invention;

FIG. 5 is a schematic structural view of a spiral arc striking bank assembly according to the present invention;

FIG. 6 is a schematic structural view of the opening spring assembly according to the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a contact system of a direct current quick breaker comprises a static contact bar 1, a static contact component 5, a dynamic contact bar 2 and a dynamic contact 6, the flexible connection assembly comprises a flexible connection assembly 3, a fixed bar 4, a backflow bar 8, a spiral arc striking bar assembly 7 and a brake separating spring assembly 9, wherein the fixed conducting bar 1 and the spiral arc striking bar assembly 7 are respectively positioned on two sides above the movable conducting bar 2, the fixed contact assembly 5 is locked on the fixed conducting bar 1 through a bolt, the movable contact 6 is upwards hinged and fixed on the movable conducting bar 2 through a pin shaft and can swing between the fixed contact assembly 5 and the spiral arc striking bar assembly 7, the flexible connection assembly 3 tightly pressed on the movable conducting bar 2 through the fixed bar 4 is symmetrically arranged on two sides of the connection part of the movable contact 6 and the movable conducting bar 2, two sides of the spiral arc striking bar assembly 7 are connected with the movable conducting bar 2 through the backflow bar 8, and the brake separating spring assembly 9 is connected with the lower spherical pair of the movable contact 6.

The contact system forms a magnetic blow-out current path of a breaker fault circuit through the static conducting bar 1, the static contact component 5, the spiral arc striking bar component 7, the backflow bar 8 and the movable conducting bar 2.

In another embodiment, the stationary contact assembly 5 is formed by welding the conductive block 51, the stationary contact silver point 52 and the rear arc striking row 53.

In another embodiment, the flexible connection assembly 3 includes a first conductive bar 31, a second conductive bar 32, and a third conductive bar 33 that are distributed in a triangular manner, wherein the first conductive bar 31 and the third conductive bar 33 are respectively connected to the second conductive bar 32 through a flexible copper structure 34 formed by weaving and overlapping multiple layers of copper, the flexible copper structure 34 is in an arch shape, the whole flexible connection assembly 3 is in an M shape, step grooves are respectively formed in the first conductive bar 31, the second conductive bar 32, and the third conductive bar 33, connection ends of the flexible copper structure 34 and the conductive bars are all pressed through copper pipes (not shown in the figure), end faces of the copper pipes are fixedly connected to bottom surfaces of the step grooves by soldering, and gaps between the copper pipes and the step edges of the step grooves are filled by brazing.

Through the structure, the movable contact 6 and the movable conducting bar 2 are connected through the flexible connecting component 3, the flexibility of the flexible connection is utilized, the flexible and non-blocking rotation of the front and the back of the movable contact 6 is facilitated, the conductive overlapping surface can be reduced by the connection mode, the conductive area is increased, the loop resistance is reduced, and the good and reliable conductivity is facilitated.

In another embodiment, the first conductive bar 31 and the third conductive bar 33 are provided with a first circular hole (not shown) for facilitating the coupling with the movable contact 6, and the second conductive bar 32 is provided with a second circular hole (not shown) for facilitating the coupling with the movable contact 2.

In another embodiment, the spiral arc striking bar assembly 7 includes a front arc striking bar 71 disposed at an opposite side of the static conductive bar 1 along an extension direction of the static conductive bar 1, the left and right sides of the lower end of the front arc striking bar 71 are connected with a left spiral bar 72 and a right spiral bar 73 which are symmetrical, the outer sides of the left spiral bar 72 and the right spiral bar 73 are respectively welded with a fourth conductive bar 74, and the fourth conductive bar 74 is connected with the movable conductive bar 2 through a return bar 8.

In another embodiment, the opening spring assembly 9 includes a ball top rod 91, a guide cylinder 92, an opening spring 93, a ball shaft sleeve 94 and a concave spherical washer 95, the guide cylinder 92 is sleeved on the ball top rod 91, the two are fixedly connected to form a hollow shaft structure, the opening spring 93 penetrates through the ball top rod 91 and is pressed into the guide cylinder 92, a planar end of the ball shaft sleeve 94 penetrates through the ball top rod 91 and is pressed into the guide cylinder 92 and compresses the opening spring 93, and a spherical end of the ball shaft sleeve 94 is connected with the concave spherical washer 95.

The opening spring assembly 9 is a linkage structure for pushing the moving contact 6 to swing, the moving contact 6 and the opening spring assembly 9 are connected through a spherical pair, the structure is flexible, the opening spring 93 is sealed in the guide cylinder 92 through the ball head shaft sleeve 94 to form a sealed insulating cover structure, and high insulation can be guaranteed. Wherein, the spherical pair connection mode of the opening spring component 9 and the moving contact 6 does not exclude: the taper hole is matched with the ball head or the round hole is matched with the ball head or the arc groove is matched with the ball head.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a contact system of direct current quick circuit breaker, including static conductive row, the static contact subassembly, move conductive row, the moving contact, soft coupling assembling, the fixed row, the backward flow is arranged, spiral striking row subassembly and separating brake spring assembly, a serial communication port, static conductive row and spiral striking row subassembly are located the both sides above moving conductive row respectively, static contact subassembly passes through bolt locking on static conductive row, the moving contact makes it can swing between static contact subassembly and spiral striking row subassembly through the round pin epaxial articulated being fixed in moving conductive row, the moving contact is provided with through the soft coupling assembling that the fixed row compressed tightly on moving conductive row with the bilateral symmetry of moving conductive row junction, the both sides of spiral striking row subassembly all link to each other with moving conductive row through the backward flow, separating brake spring assembly and the lower extreme spherical pair of moving contact are connected.

2. The contact system of the direct current fast circuit breaker according to claim 1, wherein the static contact assembly is composed of a conductive block, a static contact silver point and a rear arc striking row.

3. The contact system of a direct current fast breaker according to claim 1, wherein the flexible connection assembly comprises a first conductive bar, a second conductive bar and a third conductive bar which are distributed in a triangular manner, wherein the first conductive bar and the third conductive bar are respectively connected with the second conductive bar through a flexible copper structure formed by weaving and overlapping a plurality of layers of copper, the flexible copper structure is in an arch shape, the whole flexible connection assembly is in an M shape, step grooves are respectively arranged on the first conductive bar, the second conductive bar and the third conductive bar, the connection ends of the flexible copper structure and the conductive bars are all pressed through copper pipes, the end faces of the copper pipes are fixedly connected with the bottom surfaces of the step grooves through brazing, and gaps between the copper pipes and the step periphery of the step grooves are filled through brazing.

4. The contact system of a direct current fast circuit breaker according to claim 3, wherein the first conductive row and the third conductive row are each provided with a first circular hole for facilitating the connection thereof with the movable contact, and the second conductive row is provided with a second circular hole for facilitating the connection thereof with the movable conductive row.

5. The contact system of a direct current fast circuit breaker according to claim 1, wherein the spiral arc striking bank assembly comprises a front arc striking bank arranged at the opposite side of the static conductive bank along the extension line direction of the static conductive bank, the left and right sides of the lower end of the front arc striking bank are connected with a left spiral bank and a right spiral bank which are symmetrical, the outer sides of the left spiral bank and the right spiral bank are respectively welded with a fourth conductive bank, and the fourth conductive bank is connected with the movable conductive bank through a return row.

6. The contact system of a direct current fast circuit breaker according to claim 1, wherein the opening spring assembly comprises a ball top rod, a guide cylinder, an opening spring, a ball shaft sleeve and a concave spherical washer, the guide cylinder is sleeved on the ball top rod, the guide cylinder and the ball top rod are fixedly connected to form a hollow shaft structure, the opening spring is pressed into the guide cylinder through the ball top rod, a plane end of the ball shaft sleeve is pressed into the guide cylinder through the ball top rod and compresses the opening spring, and a spherical end of the ball shaft sleeve is connected with the concave spherical washer.