CN214313060U - Three-phase AC contactor with high switching capacity - Google Patents

Abstract

The utility model discloses a three-phase AC contactor with high switching ability, its contact element includes left, middle, right contact group, each contact group includes the preceding, back movable contact of top and counterpoints the preceding left stationary contact, the preceding right stationary contact and counterpoint the back left stationary contact, the back right stationary contact below the back movable contact below the preceding movable contact, the preceding stationary contact, the back stationary contact of one side are connected with normally open wiring end and normally closed wiring end respectively, the preceding stationary contact, the back stationary contact of the opposite side pass through the guide plate to be connected, the guide plate is installed on the conversion wiring end; the front and rear moving contacts of each contact group are respectively arranged on the front and rear ends of the corresponding reeds through the front and rear insulating contact seats, and the reeds are arranged on the armatures driven by the electromagnetic units; when the armature moves, one movable contact is communicated with the two fixed contacts aligned with the movable contact, and the other movable contact is disconnected with the two fixed contacts aligned with the movable contact. The utility model discloses a two breakpoint contact units have improved switching load capacity and product reliability.

Description

Three-phase AC contactor with high switching capacity

Technical Field

The utility model discloses electronic control components specifically are a three-phase ac contactor with high switching ability.

Background

The large load AC contactor is used as a control electrical appliance for frequently switching on or switching off a loaded circuit in an AC power transmission system and is mainly used for a remote operation and automation control system.

The contact system of the large-load three-phase alternating current contactor with the switching contacts usually adopts a single-breakpoint structure, the load switching capacity of the large-load three-phase alternating current contactor is positively correlated with the contact gap and the release speed of the contact system, the method for improving the switching capacity of the contactor usually is to increase the contact gap and the contact pressure, the method needs to increase the size of an electromagnetic system to improve the electromagnetic force, and the appearance of a product is increased.

In the structure of the traditional three-phase alternating current contactor, a movable contact is generally riveted or welded on a reed capable of elastically straining, the reed is communicated with a conversion wiring terminal, and when the movable contact and a static contact are closed, a load is conducted through the reed; when the contactor is switched off or switched on a high-voltage heavy-current load, the reed generates large heat and is easy to soften, so that the contact cannot be broken, the contact adhesion failure is caused, or the moving contact is slow in breaking speed and cannot break the electric arc, and the electric arc is continuously combusted, so that the sealed shell is exploded.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of prior art, the utility model provides a three-phase ac contactor with high switching capacity.

Utility model has three-phase ac contactor of high switching ability, its technical scheme includes including the contact element, and what the institute is different is:

1. the contact unit comprises a left group of contact group, a middle group of contact group and a right group of contact group, each contact group comprises a front movable contact and a rear movable contact which are positioned at the front and the rear positions above the contact group, a front left fixed contact and a front right fixed contact which are positioned below the front movable contact, and a rear left fixed contact and a rear right fixed contact which are positioned below the rear movable contact, the front fixed contact and the rear fixed contact at one side (left side or right side) are respectively connected with a normally open wiring end and a normally closed wiring end of the contactor, the front fixed contact and the rear fixed contact at the other side (right side or left side) are connected through a guide plate, and the guide plate is arranged on a conversion wiring end of the contactor.

2. The front moving contact and the rear moving contact of each contact group are respectively arranged on the front end and the rear end of a corresponding reed through a front insulating contact seat and a rear insulating contact seat, and the reeds are arranged on armatures driven by the electromagnetic units.

3. When the armature moves, one movable contact is communicated with the two fixed contacts aligned with the movable contact, and the other movable contact is disconnected with the two fixed contacts aligned with the movable contact.

Furthermore, each movable contact is positioned and installed in the corresponding insulating contact seat and only has one degree of freedom of up-and-down movement, and a return spring is pressed and installed between the movable contact and the insulating contact seat along the direction of the degree of freedom.

When the moving contact is disconnected with the two aligned stationary contacts, the moving contact is at the downward limit position (over travel) in the direction of the degree of freedom under the action of the return spring, and when the moving contact is in contact with the two aligned stationary contacts, the return spring is further compressed to provide pressure for the moving contact.

In order to improve the connection reliability, the guide plate and the static contact are connected through a brazing process.

In order to obtain a good flow guiding effect and reduce heat generation under a large current, the flow guiding plate is arranged on the conversion wiring end and is fastened and connected by a screw.

As a sealed three-phase ac contactor, the electromagnetic unit and the contact unit are provided in a sealed housing.

The utility model has the advantages that:

1. the utility model discloses in the three-phase ac contactor structure with high switching ability, use two breakpoint contact systems to replace traditional single breakpoint contact system, make the sum of contact clearance about original 2 times to because the partial pressure effect of two breakpoint contact systems, ac contactor's switching load capacity and product reliability have obtained the improvement.

2. The utility model discloses in the structure, the reed design can not be because of contactor switch-on or break off the load and generate heat the softening unusually for not being in the electric circuit of contactor, has avoided taking place to burn out the inefficacy because of the contact bonding inefficacy or the unusual arcing of contact that the reed softens and leads to.

3. The utility model discloses switching load capacity has been improved under the unchangeable circumstances of original product appearance.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a side view of the embodiment of fig. 1.

Fig. 3 is a top view of fig. 2 (only the stationary contacts of the contact set are shown).

Fig. 4 is a sectional view a-a in fig. 3.

And (3) identifying the figure number: 1. a front movable contact; 2. a rear moving contact; 3. a front left stationary contact; 4. a front right stationary contact; 5. a rear left stationary contact; 6. a rear right stationary contact; 7. a baffle; 8. converting the terminal; 9. a front insulated contact base; 10. a rear insulated contact base; 11. a reed; 12. an armature; 13. an electromagnetic unit; 14. a return spring; 15. a screw; 16. a contact set; 17. a base.

Detailed Description

The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.

The utility model discloses sealed three-phase ac contactor with high switching ability, including locating electromagnetism unit 13 and the contact element in the sealed casing, electromagnetism unit 13's effect lies in drive armature 12 motion, as shown in fig. 1, fig. 2.

The contact unit comprises a left group of contact points 16, a middle group of contact points 16 and a right group of contact points 16 (with equal intervals) which are arranged below the armature 12 and have the same structures, the contact point structure of the contact unit is equivalent to the contact point structure of the original contactor in the sum of space and contact point pressure, and the structure of each contact point group 16 is described as follows by taking the left contact point group 16 as an example:

the left side contact group 16 comprises a front movable contact 1 and a rear movable contact 2 which are arranged at the front and rear positions above the left side contact group, a front left fixed contact 3 and a front right fixed contact 4 are arranged on a base 17 below the front movable contact 1 in an aligned mode, a rear left fixed contact 5 and a rear right fixed contact 6 are arranged on the base 17 below the rear movable contact 2 in an aligned mode, the diameter of each movable contact is larger than the center distance of the aligned left and right fixed contacts, the front left fixed contact 3 and the rear left fixed contact 5 are respectively arranged on a normally open terminal (arranged on the base 17) and a normally closed terminal (arranged on the base 17) of the contactor, the front right fixed contact 4 and the rear right fixed contact 6 are brazed at the front end and the rear end of the guide plate 7, the middle part of the guide plate 7 is arranged at the top of the conversion terminal 8, and the guide plate 7 is fastened on the conversion terminal 8 by using a screw 15; the front moving contact 1 and the rear moving contact 2 of the left contact group 16 are respectively installed on the front end and the rear end of a corresponding spring plate 11 through a front insulated contact seat 9 and a rear insulated contact seat 10, and the middle part of the spring plate 11 is installed on an armature 12, as shown in fig. 1, 2, 3 and 4.

The mounting structure of the movable contact and the corresponding insulating contact seat is as follows: the upper end of each moving contact is positioned and installed in the corresponding insulating contact seat and has a degree of freedom of up-and-down sliding, along the direction of the degree of freedom, a return spring 14 is pressed between the moving contact and the insulating contact seat, and under the action of the return spring 14, the lower end of each moving contact is positioned at the lowest limit position, as shown in fig. 2.

The utility model discloses a theory of operation does:

the double-breakpoint contact structure is adopted to replace the original single-breakpoint contact structure, the spring piece 11 is not in the conductive loop of the contactor, the moving contact and two mutually insulated static contacts realize the bridge connection and disconnection function of the load, namely the electromagnetic unit 13 converts the input electric signal into the electromagnetic attraction to drive the armature 12, when the armature 12 moves (namely the spring piece 11 drives the front insulated contact seat 9 and the rear insulated contact seat 10 to move), one moving contact is connected with the two static contacts aligned with the moving contact (as shown in fig. 1, the rear moving contact 2 is connected with the rear left static contact 5 and the rear right static contact 6, and the return spring 14 provides contact pressure for the moving contact), and the other moving contact is disconnected with the two static contacts aligned with the moving contact (as shown in fig. 1, the front moving contact 1 is disconnected with the front left static contact 3 and the front right static contact 4), so as to realize the conversion function of the contactor.

When the travel of the movable contact is larger than the overtravel, namely the movable contact is at the descending limit position, the movable contact is rigidly connected and driven by the insulated contact seat to be separated from the fixed contact, thereby achieving the purposes of high switching capacity and contact bonding resistance; the design of the contact pressure provided by the return spring 14 needs to fully consider the environmental index of the contactor, and the contact shaking failure caused by shaking of the movable contact after closing is avoided.

Claims (6)

1. Three-phase ac contactor with high switching capacity, including the contact unit, its characterized in that:

the contact unit comprises a left group of contact group (16), a middle group of contact group and a right group of contact group (16), each contact group (16) comprises a front movable contact (1) and a rear movable contact (2) which are positioned at the front and rear positions above the contact group, a front left fixed contact (3) and a front right fixed contact (4) which are positioned below the front movable contact (1), and a rear left fixed contact (5) and a rear right fixed contact (6) which are positioned below the rear movable contact (2), the front fixed contact and the rear fixed contact at one side are respectively connected with a normally open terminal and a normally closed terminal of the contactor, the front fixed contact and the rear fixed contact at the other side are connected through a guide plate (7), and the guide plate (7) is arranged on a conversion terminal (8) of the contactor;

the front movable contact (1) and the rear movable contact (2) of each contact group (16) are respectively arranged on the front end and the rear end of a corresponding reed (11) through a front insulated contact seat (9) and a rear insulated contact seat (10), and the reed (11) is arranged on an armature (12) driven by an electromagnetic unit (13);

when the armature (12) moves, one movable contact is communicated with the two fixed contacts aligned with the movable contact, and the other movable contact is disconnected with the two fixed contacts aligned with the movable contact.

2. Three-phase alternating current contactor with high switching capacity according to claim 1, characterized in that: each movable contact is positioned and installed in the corresponding insulating contact seat and only has one degree of freedom of up-and-down movement, and a return spring (14) is pressed and installed between the movable contact and the insulating contact seat along the direction of the degree of freedom.

3. Three-phase alternating current contactor with high switching capacity according to claim 2, characterized in that: when the moving contact is disconnected with the two counterpoint fixed contacts, the moving contact is at the descending limit position in the freedom degree direction under the action of the return spring (14), and when the moving contact is in contact with the two counterpoint fixed contacts, the return spring (14) is further compressed to provide pressure for the moving contact.

4. The three-phase ac contactor with high switching capability according to any one of claims 1 to 3, wherein: the guide plate (7) is connected with the static contact through a brazing process.

5. The three-phase ac contactor with high switching capability according to any one of claims 1 to 3, wherein: the guide plate (7) is arranged on the conversion wiring terminal (8) and is fastened and connected by a screw (15).

6. The three-phase ac contactor with high switching capability according to any one of claims 1 to 3, wherein: the electromagnetic unit (13) and the contact unit are arranged in a sealed housing.

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