CN210866069U - Contact structure and alternating current contactor - Google Patents

Abstract

The utility model provides a contact structure and ac contactor relates to switching apparatus technical field, has solved current ac contactor contact structure and has risen too high easily in the contact working process temperature and cause the contact to damage, the shorter technical problem of contact electricity life-span. The contact structure comprises a static contact body and a movable contact body; the static contact of the static contact body is matched with the moving contact of the moving contact body; and the static contact is provided with a groove, and the number of contact points is a plurality when the moving contact and the static contact are in contact fit at the groove. The utility model discloses a contact structure sets up the recess after the static contact position, has realized that the contact point increases between the sound contact, makes the contact of moving static contact more stable and inseparable, has improved contact current-carrying capacity, reduces the too high fusion welding adhesion problem that leads to of contact temperature rise, and the contact is not fragile, has improved contact structure and ac contactor's life.

Description

Contact structure and alternating current contactor

Technical Field

The utility model belongs to the technical field of the switching apparatus technique and specifically relates to a contact structure and ac contactor are related to.

Background

The ac contactor is a mechanical switching device capable of switching on, carrying and breaking current under normal circuit conditions (including overload conditions), operates by non-manual operation, and is mainly used for automatically controlling the connection and disconnection of ac electrical devices. With the development of material science, the mechanical life of the alternating current contactor is greatly prolonged, but the electrical life is far shorter than the mechanical life, which becomes a bottleneck restricting the development of the alternating current contactor. The contact of the contactor has the problems of overhigh temperature rise, fusion welding of the contact, substandard electric service life and the like.

The contact structure of the existing alternating current contactor is mainly a structure with an arc surface facing a plane or an arc surface facing an arc surface, and has the main defects that the contact is point contact type, and after the contact is closed, overcurrent heating is often caused due to insufficient current-carrying capacity to cause adhesion; meanwhile, when the switch is closed and separated in a current passing state, arc light can be generated instantly, and the larger the current is, the larger the generated arc is, the damage to the contact can be caused, and the contact can be corroded; after the contact is used for a long time, the surface contact resistance value is increased, so that the time for cutting off the circuit is prolonged, flashover short circuit is generated between the phase position and the phase position of the circuit, great harm is caused to the safe operation of electrical equipment, and the effective electrical service life of the contact is shortened.

The applicant has found that the prior art has at least the following technical problems:

the contact structure of the existing alternating current contactor has the advantages that the temperature is easily raised too high in the contact working process to cause contact damage, and the electrical service life of the contact is short.

Disclosure of Invention

An object of the utility model is to provide a contact structure and ac contactor to solve the ac contactor contact structure that exists among the prior art and rise too high easily in contact working process temperature and cause the contact to damage, the short technical problem of electric life-span of contact. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a contact structure, which comprises a static contact body; the static contact body is provided with a static contact, and the static contact is matched with the moving contact; the static contact is provided with a groove, and the groove enables a plurality of contact points to be arranged when the static contact and the moving contact are contacted.

Optionally, the groove divides the fixed contact into a first contact point and a second contact point, and there are two contact points when the movable contact is in contact with the fixed contact.

Optionally, the groove forms a circle with the first contact point and the second contact point.

Optionally, the first contact point and the second contact point are arch structures on two sides of the groove.

Optionally, the arch has a chord length of 5.8 mm.

Optionally, the groove has a depth of 0.3mm and a width of 2.5 mm.

Optionally, the stationary contact further includes a connecting portion, a bending portion, and an embedded portion, where the connecting portion, the bending portion, and the embedded portion are an integrated structure.

Optionally, the fixed contact is connected to the connecting portion.

Optionally, the bending part is provided with a mounting hole, and the bending part is in screw connection with a base of the ac contactor through the mounting hole.

Alternatively, the insertion portion may be inserted into a base of the ac contactor.

An alternating current contactor comprises a contact structure, wherein the contact structure is any one of the contact structures.

Any technical scheme can at least produce the following technical effects:

the utility model discloses a contact structure sets up the recess after the static contact position, has realized the increase of contact point between moving contact and the static contact, is a plurality ofly by an increase, makes the contact of moving the static contact more stable and inseparable, has improved the contact current-carrying capacity, reduces the too high fusion welding adhesion problem that leads to of contact temperature rise, and the contact is not fragile, has improved contact structure and ac contactor's life.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a front view of the stationary contact of the present invention;

fig. 2 is a top view of the stationary contact of the present invention;

fig. 3 is a side view of the stationary contact of the present invention;

fig. 4 is a schematic view of the connection relationship between the stationary contact and the movable contact.

In figure 1, a static contact; 11. a groove; 12. a first contact point; 13. a second contact point; 2. a connecting portion; 3. a bending section; 31. mounting holes; 4. an insertion section; 5. a wiring portion; 51. a wiring hole; 6. a movable contact body; 61. moving contact.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides a contact structure, as shown in figures 1-4, comprising a static contact body and a movable contact body 6. The stationary contact body is provided with static contact 1, and the position, size etc. of the moving contact 61 of static contact 1 and moving contact 6 (the utility model discloses a moving contact 61 is the same with current moving contact structure) can match each other, and the contact is ac contactor's executive component, through moving contact 61 and static contact 1's cooperation switch-on and disconnected contactor return circuit, realize the control to electric current and various control mode. When the attraction coil of the ac contactor is energized, the static iron core generates electromagnetic attraction, the armature is attracted, the connecting rod connected to the armature drives the moving contact 61 to move, the static contact contacts with the moving contact 61, and the contactor is in an energized state. The fixed contact 1 is provided with a groove 11, and the position of the groove 11 is preferably in the middle of the fixed contact 1, and is also a main area for realizing contact conduction of the movable contact and the fixed contact before the groove 11 is not arranged. The number of the contact points is multiple when the groove 11 makes the movable contact 61 and the static contact 1 contact and mate at the groove 11, and two shaded dot parts are the contact points as shown in fig. 4. After the grooves 11 are formed, the contact positions of the moving contact and the static contact are convex parts outside the grooves 11, the convex parts are preferably slightly convex plane structures, so that the moving contact and the static contact can be conveniently contacted, and one group of contact structures comprises one moving contact 61 and contact points formed in the areas outside the grooves 11. General ac contactor is provided with relative two sets of contact structures, the utility model discloses also be relative two sets of contact structures that set up, among a set of contact structure wherein between a plurality of contact points on same water flat line, ensure with the surfacing of moving contact 61 contact and realize better contact between the sound contact. The surface of the moving contact of the existing contact structure is generally of a slightly convex structure, after the groove 11 is formed in the position of the static contact 1, the increase of contact points between the moving contact 61 and the static contact 1 is realized, one increase is multiple, the contact of the moving contact and the static contact is more stable and compact, the current-carrying capacity of the contact is improved, the problem of fusion welding adhesion caused by overhigh temperature rise of the contact is reduced, the contact is not easy to damage, and the service life is prolonged.

As an optional implementation manner, as shown in fig. 2 and 4, the groove 11 divides the static contact 1 into a first contact point 12 and a second contact point 13, two contact points are provided when the movable contact 61 is in contact with the static contact 1, that is, a group of contact point structures are formed by one movable contact 61, the first contact point 12 and the second contact point 13, contact points of the movable contact and the static contact are increased, the number of the contact points of the whole ac contactor is increased from 2 to 4, and the two contact points on a single side ensure stable and tight contact of the contacts. The groove 11, the first contact point 12 and the second contact point 13 form a circle, the circular structure is simple to machine, the diameter of the circle is preferably 6mm, and the 6mm size is suitable for being matched with the size of the movable contact 61. Of course, the cross-sectional shapes of the recess 11 and the two stationary contacts 1 may also be other geometric shapes, such as a triangle, a quadrangle, etc., which are not further detailed herein. The first contact point 12 and the second contact point 13 are arch structures on two sides of the groove 11. The chord length of the arch structure is long, and when the moving contact 61 and the static contact 1 are contacted, the moving contact and the static contact are contacted at the position corresponding to the chord of the static contact 1, so that the contact tightness of the moving contact and the static contact is more easily realized. The first contact point 12 and the second contact point 13 are preferably symmetrically arranged on both sides of the groove 11, and the groove 11 is a drum-shaped structure with a circular structure and two side arches removed, so that the processing and manufacturing are convenient. The chord length of the arch structure is 5.8mm, which is slightly smaller than the diameter of the circular structure, which is 6 mm. The depth of the groove 11 is 0.3mm, the width is 2.5mm, the first contact point 12 and the second contact point 13 on the two sides are separated from each other conveniently under the depth value and the width value, meanwhile, after the static contact 1 is used for a period of time, the chord length position between the first contact point 12 and the second contact point 13 is easily corroded, the groove 11 enables the surface of the static contact 1 to be uneven, the contact area between the dynamic contact and the static contact can be continuously ensured to a certain degree, the current-carrying capacity is improved, and adhesion caused by overhigh temperature rise is avoided. The groove 11 can also be in a rectangular structure, and at the moment, the shape other than the circular shape is four arc shapes, so that four contact points can be formed when the moving contact 61 and the static contact 1 are in contact, and the selection can be performed according to the use requirement.

As an optional embodiment, the stationary contact further includes a connecting portion 2, a bending portion 3 and an embedding portion 4, the connecting portion 2, the bending portion 3 and the embedding portion 4 are an integral structure, and of course, the stationary contact is further integrally provided with a wiring portion 5, the wiring portion 5 is provided with a wiring hole 51 to electrically connect the contactor with the outside, the structure of the stationary contact is complex, and it is preferable that the connecting portion 2, the bending portion 3, the embedding portion 4 and the wiring portion 5 are integrally formed through a casting process. The static contact 1 is connected with the connecting part 2, preferably fixed by welding, the static contact 1 selects silver alloy with better conductivity to realize better conduction function, and the silver content of the silver alloy can be determined according to the use requirement, such as 50%, 85% and the like. The bending part 3 is provided with a mounting hole 31, the bending part 3 is in screw connection with a base of the alternating current contactor through the mounting hole 31, the upper end of the static contact body is fixed, and the structure of the bending part 3 further realizes the leading-out of the embedding part 4 and the wiring part 5. The embedded part 4 can be embedded into the base of the alternating current contactor, the height is preferably 2mm, the depth embedded into the base is 2mm, and the lower end of the static contactor is fixed. Through the fixation of the upper end and the lower end of the static contact body, the fixation between the static contact body and the base of the alternating current contactor is realized, the support function is exerted, and the correspondence of the positions between the static contact 1 and the moving contact 61 is convenient to realize.

The utility model provides an alternating current contactor, includes the contact structure, the contact structure does the utility model provides a contact structure, the contact structure is through setting up recess 11, alternating current contactor's sound contact is increased to two points of unilateral totally four points by original two points, and the contact of sound contact is more stable and inseparable, has improved alternating current contactor's life and reliability, and alternating current contactor cut-off circuit time can not prolong along with the live time, has ensured electrical equipment's safe operation.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (11)

1. A contact structure is characterized by comprising a static contact body and a movable contact body; the static contact of the static contact body is matched with the moving contact of the moving contact body; and the static contact is provided with a groove, and the number of contact points is a plurality when the moving contact and the static contact are in contact fit at the groove.

2. The contact structure of claim 1, wherein the groove divides the stationary contact into a first contact and a second contact, and there are two contacts when the movable contact contacts the stationary contact.

3. The contact structure of claim 2, wherein the recess forms a circle with the first contact point and the second contact point.

4. The contact structure of claim 3, wherein the first and second contact points are arcuate structures on opposite sides of the recess.

5. The contact structure of claim 4, wherein the arch has a chord length of 5.8 mm.

6. The contact structure of claim 1, wherein the recess has a depth of 0.3mm and a width of 2.5 mm.

7. The contact structure according to claim 1, wherein the stationary contact further comprises a connecting portion, a bent portion, and an embedded portion, and the connecting portion, the bent portion, and the embedded portion are an integral structure.

8. The contact structure of claim 7, wherein the stationary contact is connected to the connecting portion.

9. The contact structure according to claim 7, wherein the bent portion is provided with a mounting hole, and the bent portion is screwed with a base of the ac contactor through the mounting hole.

10. The contact structure according to claim 7, wherein the insertion portion is capable of being inserted into a base of an ac contactor.

11. An ac contactor comprising a contact construction, wherein the contact construction is as claimed in any one of claims 1 to 10.

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