CN212516945U

CN212516945U - Contact unit with electrodynamic force compensation function

Info

Publication number: CN212516945U
Application number: CN202022295776.4U
Authority: CN
Inventors: 陈红群; 张志芳; 张晓佟
Original assignee: Schneider Wingoal Tianjin Electric Equipment Co Ltd
Current assignee: Schneider Wingoal Tianjin Electric Equipment Co Ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-02-09
Anticipated expiration: 2030-10-15

Abstract

The utility model provides a contact unit with electrodynamic force compensation function, which comprises a movable contact component and a static contact component; the moving contact component comprises a moving contact body and a moving contact armature; the moving contact armature is arranged on the moving contact through a rivet; the static contact component comprises a static contact body and a static contact iron core; the static contact iron core is arranged on the static contact through a rivet; the moving contact silver point is opposite to the static contact silver point. A contact unit with electrodynamic force compensation function, retained the structure of silver-based alloy as the switch contact, had higher switch-on breaking capacity. Meanwhile, the electric repulsion between the moving contact and the static contact is compensated by the suction force generated between the armature and the iron core, so that the dynamic stability of the switch is improved, and the switch not only keeps higher on-off capacity, but also has higher short-time tolerance capacity.

Description

Contact unit with electrodynamic force compensation function

Technical Field

The utility model belongs to the switching apparatus field especially relates to a contact unit with electrodynamic force compensation function.

Background

The contact structure of the existing switch is generally divided into a plug-in contact and a clapper contact. The plug-in contact structure has the advantages that the moving contact and the static contact are a group of parallel conductors, electric suction is generated when current passes through the contacts, and the dynamic stability is good, so that the contact structure can achieve high short-time tolerance, but is influenced by the electric suction, the switching-on and breaking speed is low, the arcing time is long, and the switching-on and breaking capacity index is poor. The clapper type contact structure mostly adopts silver-based alloy as a contact, has strong arc resistance and higher connection and disconnection capacity, but is influenced by electric repulsion between a moving contact and a static contact, and has poor dynamic stability, so the short-time tolerance of the switch of the structure is relatively weaker.

Disclosure of Invention

In view of this, the present invention aims to overcome the above-mentioned defects in the prior art and provide a contact unit with electrodynamic compensation function, which can improve the dynamic stability of the switch, thereby achieving higher short-time endurance.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a contact unit with an electrodynamic force compensation function comprises a moving contact component and a static contact component, wherein the moving contact component comprises a moving contact body and a moving contact armature, a moving contact silver point is arranged on the moving contact body, the moving contact body and the moving contact armature are installed together, the moving contact armature is of an open structure, the moving contact body is wholly or partially installed in the open structure of the moving contact armature, and the moving contact silver point is positioned on the section, close to an opening of the open structure of the moving contact armature, of the moving contact body in the moving and static contact actuation direction;

the static contact component comprises a static contact body and a static contact iron core, and a static contact silver point is arranged on the static contact body; the static contact body and the static contact iron core are installed together, the static contact iron core is of an open structure, the static contact body is wholly or partially installed in the open structure of the static contact iron core, and the static contact silver point is located on the section, close to the opening of the open structure of the static contact iron core, of the dynamic and static contact attraction direction of the static contact body.

Furthermore, when the moving contact and the static contact are closed, a gap exists between the magnetic pole surface of the armature of the moving contact and the magnetic pole surface of the iron core of the static contact.

Furthermore, the magnetic pole surface of the moving contact armature and the magnetic pole surface of the static contact iron core are oppositely arranged.

Furthermore, riveting interfaces are arranged on two sides of the moving contact armature, riveting interfaces are arranged at the head of the moving contact body, and two groups of riveting interfaces are correspondingly arranged; the moving contact armature and the moving contact body are riveted and fixed through two rivets.

Further, the static contact iron core is provided with a riveting interface, the static contact body is provided with a riveting interface, and the two groups of riveting interfaces are correspondingly arranged; and the static contact iron core and the static contact body are riveted and fixed through two rivets.

Furthermore, the moving contact silver point extends out of the opening structure of the moving contact armature; the static contact silver point extends out of the opening structure of the static contact iron core.

Compared with the prior art, the utility model discloses following advantage has:

the utility model provides a contact unit with electrodynamic force compensation function utilizes the electric repulsion between the suction compensation sound contact that produces between armature and the iron core, has improved the dynamic stability of switch to reach higher short-time endurance ability. When the contact bears rated working current, the attraction force generated between the armature and the iron core is not enough to overcome the opening moment of the switch mechanism, the speed of normally breaking the circuit of the switch contact is not influenced, the arcing time is short, and the silver-based alloy contact with strong arc resistance is matched to be used, so that the connection breaking capacity is high.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic view of a moving contact and a static contact at a brake separating position according to an embodiment of the present invention;

fig. 2 is a schematic view of a moving contact and a stationary contact in a closing position according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of the moving and static contacts in closing operation according to the embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a moving contact assembly according to an embodiment of the present invention;

fig. 5 is a schematic view of a movable contact body according to an embodiment of the present invention;

fig. 6 is a schematic view of a moving contact armature according to an embodiment of the present invention;

fig. 7 is a schematic view of a movable contact assembly according to an embodiment of the present invention;

fig. 8 is a top view of a movable contact assembly according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a fixed contact assembly according to an embodiment of the present invention;

fig. 10 is a schematic view of a static contact body according to an embodiment of the present invention;

fig. 11 is a schematic view of a static contact iron core according to an embodiment of the present invention;

fig. 12 is a schematic view of a static contact assembly according to an embodiment of the present invention.

Description of reference numerals:

1. a moving contact assembly; 2. a stationary contact assembly; 3. a moving contact body; 4. a moving contact silver point; 5. a moving contact armature; 6. a static contact body; 7. static contact silver points; 8. a static contact iron core; 9. a moving contact rivet; 10, a static contact rivet; 51. an armature pole face; 81. and iron core magnetic pole faces.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1-2 are schematic diagrams of the moving and stationary contacts at the opening position and the moving and stationary contacts at the closing position in this embodiment, respectively. Fig. 3 is a sectional view of the movable and stationary contacts when closing. As shown in fig. 1 to 3, the contact unit described in the present embodiment includes a movable contact assembly (1) and a stationary contact assembly (2). The moving contact component (1) comprises a moving contact body (3) and a moving contact armature (5), and the fixed contact component (2) comprises a fixed contact body (6) and a fixed contact armature (8). The moving contact silver point (4) is arranged on the moving contact body (3), and the static contact silver point (7) is arranged on the static contact body (6). The moving contact silver point (4) and the static contact silver point (7) are arranged oppositely. Riveting interfaces are arranged on two sides of the moving contact armature (5), riveting interfaces are arranged at the head of the moving contact body (3), and the two groups of riveting interfaces are correspondingly arranged; the moving contact armature (5) and the moving contact body (3) are riveted and fixed through two rivets. The static contact iron core (8) is provided with a riveting interface, the static contact body (6) is provided with a riveting interface, and the two groups of riveting interfaces are correspondingly arranged; and the static contact iron core (8) and the static contact body (6) are riveted and fixed through two rivets. As shown in fig. 4 to 8, the assembly process of the movable contact assembly (1) is as follows: the head of one side of the moving contact body (3) is arranged in a moving contact mounting groove of the moving contact armature (5), and then a rivet (9) penetrates through rivet holes of the moving contact armature (5) and the moving contact body (3) to be riveted. The other side is assembled into the moving contact component (1) in the same way. The moving contact body (3) and the moving contact armature (5) are fixed in a mode not limited to a rivet riveting mode, and the moving contact body (3) and the moving contact armature (5) can be fixed together by adopting screw connection or adding a fixing piece. In the assembled moving contact assembly (1), a moving contact body (3) and a moving contact armature (5) are installed together, the moving contact armature (5) is of an open structure, the moving contact body (3) is wholly or partially installed in the open structure of the moving contact armature (5), and a moving contact silver point (4) is positioned on the cross section of an opening of the moving contact armature (5) close to the open structure in the moving contact attraction direction on the moving contact body (3).

As shown in fig. 9-12, the assembly process of the static contact assembly (2) is as follows: firstly, a static contact body (6) is arranged in a static contact mounting groove of a static contact iron core (8), then a rivet (10) penetrates through rivet holes of the static contact iron core (8) and the static contact body (6) and is riveted to assemble a static contact assembly (2). The fixing mode of the static contact body (6) and the static contact iron core (8) is not limited to the mode of riveting by using rivets, and the static contact body (6) and the static contact iron core (8) can be fixed together by adopting screw connection or adding a fixing piece. In the assembled static contact component (2), a static contact body (6) and a static contact iron core (8) are installed together, the static contact iron core (8) is of an open structure, the static contact body (6) is wholly or partially installed in the open structure of the static contact iron core (8), and a static contact silver point (7) is located on the cross section of an opening, close to the open structure of the static contact armature (8), of the static contact body (6) in the adsorption direction of the static and dynamic contacts.

The moving contact silver point (4) can be extended out and leveled or sunk into an opening structure; the static contact silver point (7) can be extended out, flush or sunk into an opening structure, but a gap is ensured to exist between a magnetic pole surface (51) of the moving contact armature (5) and a magnetic pole surface (81) of the static contact iron core (8) when the moving contact and the static contact are closed, and the gap is called as an air gap. The magnetic pole surface (51) of the moving contact armature (5) and the magnetic pole surface (81) of the static contact iron core (8) are oppositely arranged and can be opposite or obliquely opposite.

The attractive force between the armature and the core is affected by the air gap between the armature and the core, the area of the pole faces of the armature and the core, and the relative position of the armature and the core. The smaller the air gap, the greater the attraction force, and the larger the area of the pole face, the greater the attraction force when the armature and the core are aligned relative to the attraction force when the armature and the core are tilted. The desired suction force can be achieved by adjusting these parameters.

In the closing process of the contact, an air gap between the magnetic pole surface of the armature and the magnetic pole surface of the iron core changes along with the movement of the contact, and when the movable contact moves to the closing position, a circuit is closed. Since the contacts carry a current, the current causes an attractive force between the armature and the core, which varies with the magnitude of the current. When the current is larger, the attraction force is larger, and conversely, the attraction force is smaller. When short-time withstand current is carried between the contacts, the attraction force generated between the armature and the iron core can overcome the electric repulsion force between the contacts, and the contacts are ensured not to be repelled by electric force when being closed. When the contact bears rated working current, the attraction force generated between the armature and the iron core is not enough to overcome the opening moment of the switch mechanism, so that the speed of normally breaking the circuit of the switch contact is not influenced, and the arcing time is short.

The utility model discloses remain silver-based alloy as the structure of switch contact, had higher switch-on breaking capacity. Meanwhile, the electric repulsion between the moving contact and the static contact is compensated by the suction force generated between the armature and the iron core, so that the dynamic stability of the switch is improved, and the switch not only keeps higher on-off capacity, but also has higher short-time tolerance capacity.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A contact unit with electrodynamic force compensation function, comprising a moving contact component (1) and a static contact component (2), characterized in that:

the moving contact component (1) comprises a moving contact body (3) and a moving contact armature (5), a moving contact silver point (4) is arranged on the moving contact body (3), the moving contact body (3) and the moving contact armature (5) are installed together, the moving contact armature (5) is of an open structure, the moving contact body (3) is wholly or partially installed in the open structure of the moving contact armature (5), and the moving contact silver point (4) is positioned on the section, close to the opening of the open structure of the moving contact armature (5), of the moving contact body (3) in the moving and static contact actuation direction;

the static contact assembly (2) comprises a static contact body (6) and a static contact iron core (8), and a static contact silver point (7) is arranged on the static contact body (6); the static contact body (6) and the static contact iron core (8) are installed together, the static contact iron core (8) is of an open structure, the static contact body (6) is installed in the open structure of the static contact iron core (8) in whole or in part, and the static contact silver point (7) is located on the section, close to the opening of the open structure of the static contact iron core (8), of the dynamic and static contact attraction direction of the static contact body (6).

2. The contact unit having an electrodynamic force compensation function according to claim 1, wherein: when the moving contact and the static contact are closed, a gap exists between a magnetic pole surface (51) of the moving contact armature (5) and a magnetic pole surface (81) of the static contact iron core (8).

3. A contact unit with electrodynamic compensation function according to claim 2, characterised in that the pole face (51) of the moving contact armature (5) and the pole face (81) of the stationary contact core (8) are arranged opposite to each other.

4. The contact unit having an electrodynamic force compensation function according to claim 1, wherein: riveting interfaces are arranged on two sides of the moving contact armature (5), riveting interfaces are arranged at the head of the moving contact body (3), and the two groups of riveting interfaces are correspondingly arranged; the moving contact armature (5) and the moving contact body (3) are riveted and fixed through two rivets.

5. The contact unit having an electrodynamic force compensation function according to claim 1, wherein: the static contact iron core (8) is provided with a riveting interface, the static contact body (6) is provided with a riveting interface, and the two groups of riveting interfaces are correspondingly arranged; and the static contact iron core (8) and the static contact body (6) are riveted and fixed through two rivets.

6. The contact unit having an electrodynamic force compensation function according to claim 1, wherein: the moving contact silver point (4) is extended out of the opening structure of the moving contact armature (5); and the static contact silver point (7) is extended out of the opening structure of the static contact iron core (8).