CN202940204U

CN202940204U - Silver contact structure of contact system

Info

Publication number: CN202940204U
Application number: CN 201220692348
Authority: CN
Inventors: 赵建平; 黄竹根
Original assignee: SHANGHAI DADA ELECTRIC APPLIANCE CO Ltd
Current assignee: SHANGHAI DADA ELECTRIC APPLIANCE CO Ltd
Priority date: 2012-11-27
Filing date: 2012-11-27
Publication date: 2013-05-15
Anticipated expiration: 2022-11-27

Abstract

A silver contact structure of a contact system relates to an improvement technology of a contact point of a contactor or a breaker. The structure comprises a static contact, a static contact silver contact point, a moving contact silver contact point and a moving contact. The static contact and the moving contact are provided with salient points. Pressed groove surfaces are arranged on the static contact silver contact point and the moving contact silver contact point. The pressed groove surfaces of the static contact silver contact point and the moving contact silver contact point and the salient points of the static contact and the moving contact are welded together. According to utility model, the mechanical strength of the silver contact is high; during welding, positioning is easy and the positioning is accurate; operation is convenient and efficiency is high; the welding is firm; smoothness of a current flowing through the contact is good; a resistor impedance is reduced; a silver material is reduced and cost is reduced too.

Description

A kind of silver contact structure of contact system

Technical field

This novel improvement technology that relates to the contact point of a kind of contactor or circuit breaker is specifically related to the silver contact structure of above-mentioned contact system.

Background technology

Dynamic and static contact on the contact system of general contactor or circuit breaker can produce high temperature and the spark of moment on the contact point that connects and disconnect, impel its contact point after multifrequency use, easily produce electrolysis and oxidation, so with adopting increasing thickening high-molecule metal silver to make contact point on its contact point, therefore be called silver contact.

The silver contact that uses now is powder compaction, from the disjunction index of product, and mechanical endurance, electric life consideration, silver contact thickness is not more than 0.8mm just can satisfy properties of product and design objective; If processing technology satisfies, silver contact is designed to 1mm left and right thickness sheet form, in fact also can satisfy properties of product and design objective, but the thickness of the silver contact of powder compaction and contact area have very large relation, after contact area was done greatly, the thickness of the silver contact of powder compaction also will increase thickness accordingly, otherwise, the mechanical strength of contact does not reach performance requirement, and welding process is flexible type also; Thereby used contact thickness size all is not less than 2mm; Yet after silver point thickness increased, the slider material cost can increase a larger proportion.

Use now be powder metallurgy make solve above problem silver strip as silver contact, such silver strip only has a planar structure at the contact-making surface with the contact welding, easily not prison welding is solid, also easily when welding occurring the workman to operate the location inaccurate, inconvenient, therefore often need to realize welding by fixture, simultaneously silver strip thickens cost also increases very greatly, and after reducing silver strip thickness, mechanical strength does not reach designing requirement.

Existing silver contact welding method step is: 1. according to silver point and dynamic and static contact shape, and the good upper and lower electrode holder of customization; 2. securely the fixture of upper and lower electrode is arranged on spot welding machine, and adjusts stroke; 3. regulate the operating current of spot welding machine, and guarantee that cooling water source is unimpeded; 4. silver point and contact are placed on fixture after accurate positioning, add the attached scolders that help such as graphite, 102 brazing fluxes, silver soldering sheet at their solder side place silver point is welded on contact.

Above-mentioned weldering is compared with the welding of the silver point of this new patent the time by method and had following defective: will locate by estimating when (1) silver point and moving contact or fixed contact welding, size does not often reach designing requirement, and time-consuming; And this new patent is located by the concave surface cooperation moving contact of silver point or the convex surface of fixed contact, removed the shape that upper and lower electrode is processed into fixture from, crux be, the shape of silver point and moving contact and fixed contact cost of manufacture new patent, accurate positioning, save time, laborsaving, improved production efficiency; (2) existing welding method solder side only has one, and due to attached flow between the contact-making surface cause of inequality or piece surface greasy dirt of scolder that helps, between contact-making surface, total non-a hundred per cent fuses fully, causes substandard products quantity to increase.

Novel content

This is novel provides this novel purpose of silver contact structure of a kind of contact system to be to provide a kind of silver contact structure of contact system.Adopt skeleton contact structure higher than the silver contact machinery intensity that the powder metallurgy of stack pile is pressed into; Be more conducive to improve mechanical strength, when welding simultaneously, contact-making surface increases to six places, use the contact of contact and the upper and lower concavo-convex matching form in contact, during welding very easily the location and accurate positioning, handled easily and efficient high, weld more firmly, can make electric current pass through the smoothness of contact good, reduce resistive impedance, reduce silver-colored material, reduce costs.

For addressing the above problem, the following technical scheme of this novel employing:

A kind of silver contact structure of contact system comprises fixed contact 1, fixed contact silver contact 2, moving contact silver contact 3 and moving contact 4; On fixed contact 1 and moving contact 4 contact points, raised points is arranged; The groove surface that compacting is arranged on fixed contact silver contact 2 and moving contact silver contact 3, the raised points of the groove surface of fixed contact silver contact 2, moving contact silver contact 3 and fixed contact 1 and moving contact 4 welds together.

This novel advantage is:

1, such silver contact structure can make the electric current that passes through more smooth and easy;

2, it is more firm that the silver contact that increases like this solder side makes silver strip be connected with contact, can reduce current density, reduces resistive impedance;

3, the processing location is convenient, and precision improves, reduces labor strength;

4, reduce silver-colored material, reduce costs about 35%-40%.

Description of drawings

Fig. 1 is this novel silver contact dynamic/static contact integrated structure schematic diagram;

Fig. 2 is this novel silver contact dynamic/static contact separate structure schematic diagram;

Fig. 3 is this novel silver contact silver strip Facad structure schematic diagram;

Fig. 4 is this novel silver contact silver strip structure schematic diagram;

Fig. 5 is this novel silver contact silver strip cutting plane structural representation;

Fig. 6 is this novel silver contact silver strip perspective view.

Symbol description in figure: 1. fixed contact, 2. fixed contact silver contact, 3. moving contact silver contact, 4. moving contact.

Embodiment

The below with best example to this novel being described in detail.

Consult shown in 1-6, a kind of silver contact structure of contact system comprises fixed contact 1, fixed contact silver contact 2, moving contact silver contact 3 and moving contact 4; On fixed contact 1 and moving contact 4 contact points, raised points is arranged; The groove surface that compacting is arranged on fixed contact silver contact 2 and moving contact silver contact 3, the raised points of the groove surface of fixed contact silver contact 2, moving contact silver contact 3 and fixed contact 1 and moving contact 4 welds together.

The raised points of the groove surface of described fixed contact silver contact 2 and moving contact silver contact 3 and fixed contact 1 and moving contact 4 is square structure; Four sides of raised points and the bottom surface, one of four side of bottom surface and groove surface and surface totally six faces are welded to each other.

Planar annular 5 around described surperficial silver contact groove.

A kind of silver contact of contact system comprises following preparation process:

(1) process raised points on the contact point with fixed contact 1 and moving contact 4;

(2) with fixed contact silver contact 2 and the top press flute face of moving contact silver contact 3;

(3) fixed contact silver contact 2 and moving contact silver contact 3 are welded in respectively on fixed contact 1 and moving contact 4.

Concrete welding method is: regulate the stroke that the carbon electrode heating welding picks, regulate the operating current of bonding machine according to workpiece material, shape, thickness, and reach the welding temperature of 600 ℃-800 ℃, and guarantee that cooling water source is unimpeded and be beneficial to device security work; In pre-welding silver contact position, namely the convex surface of contact, after coating soldering flux, be placed on lower carbon electrode with the contact after pickling or plating, with tweezers, the silver contact that soaked soldering flux taken out, and be assemblied on contact; The power turn-on switch, move on the contact surface that assembles when upper carbon electrode, the operating current conducting that pre-sets, and at a large amount of heat of solder side place's generation, the silver soldering sheet is added on the solder side place, after soldering flux to be added, silver soldering sheet, graphite melting and when being evenly distributed in the solder side place, the bonding machine automatic cut-off power; To weld good contact with tweezers and take out that to be placed in air cooling.

This Novel saving precious metal, originally only having in a solder side situation, utilizing male and fomale(M﹠F) to coordinate and be increased to six solders side, increasing the area of whole solder side, make the welding of silver point and dynamic and static contact more firmly, conductive characteristic is higher, improved parts quality and qualification rate.

This novel innovative point: 1. silver contact used, save material and approximately 35%, greatly saved cost; 2. the contact mechanical strength that is pressed into than the powder of stack pile is high; Do not reach by force designing requirement by machinery after the conventional contact attenuation, and adopt this programme to become the skeleton form to be more conducive to improve the machine mechanical strength contact attenuation; 3. firm welding; Only have a pair ofly during traditional contact welding by tactile face, contact-making surface increases to six pairs and employing this programme contact is welded on time; 4. improved production efficiency; During the conventional contact welding, the location is inaccurate, inconvenient, often need to be by fixture; And adopt the upper and lower concavo-convex matching form of this programme contact, very easily locate and accurate positioning during welding.

This new patent adopts empties in the middle of being, the silver contact of the condition of equivalent thickness of the skeleton form of contact-making surface thickness 1mm left and right; Effectively the face of weld is long-pending has increased; For example, one is of a size of the 15*15*2.5 contact, and bonding area is 225mm now ², quality is 7.4g, the centre is emptied and is become 303mm for bonding area behind the contact of wall thickness 1mm skeleton form ², quality becomes 4.1g, and bonding area has increased by 35%, and quality has saved 44.6%; Due to a variety of causes such as existing welding equipment, techniques, efficient weld area usually can only reach 85% left and right solder side again, and namely effectively bonding area reaches the bonding area of 85% left and right, the contact welding is cheap firm, conductive characteristic also can meet the demands; Therefore, effectively bonding area has increased, and has also just improved contact also, conductive characteristic more firm with regard to welding.

This is novel is not limited to above-mentioned preferred forms; can be adapted to any amount of dynamic/static contact contact system; anyone should learn the structural change of making under this novel enlightenment, every novelly have an identical or close technical scheme with this, within all falling into novel protection range.

Claims

1. the silver contact structure of a contact system, comprise fixed contact (1), fixed contact silver contact (2), moving contact silver contact (3) and moving contact (4); It is characterized in that on fixed contact (1) and moving contact (4) contact point, raised points being arranged; The groove surface that compacting is arranged on fixed contact silver contact (2) and moving contact silver contact (3), the raised points of the groove surface of fixed contact silver contact (2), moving contact silver contact (3) and fixed contact (1) and moving contact (4) welds together.

2. a kind of silver contact structure of contact system as claimed in claim 1, it is characterized in that, the raised points of the groove surface of described fixed contact silver contact (2) and moving contact silver contact (3) and fixed contact (1) and moving contact (4) is square structure; Four sides of raised points and four sides of bottom surface and groove surface, bottom surface and surface totally six faces are welded to each other.