CN212161646U

CN212161646U - Fixed contact, contact mechanism and microswitch

Info

Publication number: CN212161646U
Application number: CN202021030325.1U
Authority: CN
Inventors: 金晓晨; 王维东; 孙国平
Original assignee: Shanghai Feili Xuncheng Electric Technology Co ltd
Current assignee: Shanghai Feili Xuncheng Electric Technology Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-12-15
Anticipated expiration: 2030-06-08

Abstract

The embodiment of the utility model relates to a low-voltage electrical apparatus switch, in particular to a fixed contact, a contact mechanism and a microswitch; the fixed contact point includes: decide contact support, first, the second body of deciding the contact, decide the contact support and include: the connecting portion, the contact site, respectively with the supporting part that connecting portion and contact site are connected, set up the T-slot on the connecting portion, the long limit of being connected with the supporting part is cut apart into with the connecting portion to the T-slot, set up in first, the second side on long limit relatively, keep away from the first minor face that the direction level of long limit extended to the second side by the first side one end, keep away from the second minor face that the direction level of long limit extended to the first side by the second side, first, the second minor face is bent towards the direction of keeping away from the connecting portion respectively. Compared with the prior art, the damage of the metal coating on the surface of the contact caused by riveting of the contact can be effectively avoided, and the phenomenon that the movable contact and the fixed contact are separated in a short time due to a high-frequency vibration environment of the microswitch is avoided.

Description

Fixed contact, contact mechanism and microswitch

Technical Field

The embodiment of the utility model provides a low-voltage apparatus switch is related to, in particular to decide contact, contact mechanism and micro-gap switch.

Background

The microswitch is a switch with very small force, in which external mechanical force acts on an action reed through a transmission element to quickly connect or disconnect a fixed contact and a movable contact at the tail end of the microswitch. When the micro switch is used, the conditions that the contact is unreliable and the signal is not accurately sent are often caused by the following reasons. First, a gold-plated contact is used for the contact length of the micro switch, but the gold-plated contact is easy to damage the gold-plated layer in the riveting process, so that dust is generated due to the abrasion of the contact in the switching action process, and meanwhile, an oxide film is generated on the surface of the contact due to the abrasion of the gold-plated layer, so that the contact is unreliable. Secondly, the movable contact and the fixed contact of the switch are often separated for a short time due to a high-frequency vibration environment, so that the movable contact and the fixed contact of the switch can be in unreliable contact.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model aims to provide a decide contact, contact mechanism and micro-gap switch can effectively avoid the contact because of the riveting, and the damage of the metallic coating on the contact surface that leads to has avoided micro-gap switch to cause the movable contact of switch and decide the contact to appear the short-time detached phenomenon because of the high-frequency vibration environment simultaneously.

In order to achieve the above object, an embodiment of the present invention provides a fixed contact, including:

decide the contact support, bend by the plain film and constitute, include: the connecting part and the contact part are respectively formed by horizontally bending two ends of the supporting part towards the opposite directions; the connecting part is provided with a T-shaped groove, the T-shaped groove divides the connecting part into a long edge connected with the supporting part, a first side edge and a second side edge which are oppositely arranged on the long edge, a first short edge which horizontally extends from one end of the first side edge far away from the long edge to the direction of the second side edge, and a second short edge which horizontally extends from one end of the second side edge far away from the long edge to the direction of the first side edge, and the first short edge and the second short edge are respectively bent towards the direction far away from the connecting part, so that a V-shaped groove is formed between the first short edge and the second short edge;

the surface of the first fixed contact body is provided with a first metal coating; the first fixed contact body is welded on one side of the first short side opposite to the connecting part;

the surface of the second fixed contact body is provided with a second metal coating; the second fixed contact body is welded on one side of the second short side opposite to the connecting part.

Additionally, the utility model discloses an embodiment has still designed a contact mechanism, include: the movable contact comprises a movable contact support, a movable contact body welded on the movable contact support and the fixed contact;

the V-shaped groove formed between the first short edge and the second short edge of the fixed contact point is opposite to the movable contact point body, and the movable contact point support is used for driving the movable contact point body to perform linear motion relative to the V-shaped groove;

when the movable contact body moves to a preset position towards the V-shaped groove, the movable contact body is respectively abutted against the first fixed contact body and the second fixed contact body;

and a third metal coating is arranged on the surface of the movable contact body.

Additionally, the utility model discloses an embodiment has still designed a micro-gap switch, include: the contact mechanism as described above.

Compare with prior art, because the fixed contact support of fixed contact is bent by the plain film and forms, include: a supporting part, connecting portion and the contact site of being bent formation by the both ends of supporting part, set up the T-slot on the contact site simultaneously, make connecting portion can be cut apart into the long limit of being connected with the supporting part by the T-slot, set up relatively in long first side and second side on long limit, keep away from the first minor face of the direction level extension of one end on long limit to the second side by the first side, keep away from the second minor face of the direction level extension of one end on long limit to the first side by the second side, and because first minor face and second minor face are bent respectively towards the direction of keeping away from connecting portion, make and to form the V-shaped groove between first minor face and the second minor face, can realize automatic guide and location to the motion of movable contact body through the V-shaped groove, make the movable contact body when moving to predetermineeing the position towards the direction of V-shaped groove, can respectively with first fixed contact body and second fixed contact body counterbalance, thereby avoided micro-gap switch to cause movable contact body and the disconnection phenomenon improves the reliability of the microswitch. Meanwhile, the first fixed contact body, the second fixed contact body and the movable contact body are fixedly welded, so that the phenomenon that a metal coating on the surface of the contact body is damaged due to riveting of the contact body can be effectively avoided, and the reliability of the movable contact body and the fixed contact body in contact is further improved.

And the first fixed contact body is welded on the first short side, and the second fixed contact body is welded on the second short side, so that the structure is simple and convenient.

Further, the first metal plating layer and the second metal plating layer are both gold plating layers.

Furthermore, the cambered surface that the side that deviates from the first short side of the first fixed contact body and the side that deviates from the second short side of the second fixed contact body are convex outwards.

Furthermore, the connecting part is provided with a mounting hole.

Furthermore, the plain film is formed by cutting a material belt which is subjected to stamping forming.

Further, the third metal plating layer is a gold plating layer.

Furthermore, one side of the movable contact body relative to the V-shaped groove is a convex cambered surface.

Drawings

Fig. 1 is a schematic view of the working states of a fixed contact and a movable contact according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of a contact support of a fixed contact according to a first embodiment of the present invention in a flat state;

fig. 3 is a schematic structural view of a contact holder of a fixed contact according to a first embodiment of the present invention after being bent;

fig. 4 is a schematic structural view of a first fixed contact body and a second fixed contact body of a fixed contact according to a first embodiment of the present invention;

fig. 5 is a schematic structural view of a contact mechanism according to a second embodiment of the present invention;

fig. 6 is a schematic view illustrating the second embodiment of the present invention when the movable contact and the fixed contact are electrically abutted.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

A first embodiment of the present invention relates to a fixed contact, as shown in fig. 1, comprising: the fixed contact comprises a fixed contact support 1, a fixed contact body 2 and a second fixed contact body 3.

First, the fixed contact point holder 1 is formed by bending a flat piece, and as shown in fig. 1, includes: the connecting portion 11, the contact portion 12, and the supporting portion 13 respectively connected to the connecting portion 11 and the contact portion 12, wherein the connecting portion 11 and the contact portion 12 are respectively formed by horizontally bending both ends of the supporting portion 13 toward a direction opposite to each other. The connecting portion 11 is provided with a T-shaped groove 121, the T-shaped groove 121 divides the connecting portion 12 into a long side 122 connected to the support portion 13, a first side 123 and a second side 124 provided on the long side 122 so as to face each other, a first short side 125 extending horizontally in a direction toward the second side 124 from an end of the first side 123 away from the long side 122, and a second short side 126 extending horizontally in a direction toward the first side 123 from an end of the second side 124 away from the long side 122, and the first short side 125 and the second short side 126 are bent in directions away from the connecting portion 11, respectively, so that a V-shaped groove 127 is formed between the first short side 125 and the second short side 126.

Next, a first metal plating layer is provided on the surface of the first fixed contact body 2, a second metal plating layer is provided on the surface of the second fixed contact body 3, and the first fixed contact body 2 is welded to the side of the first short side 125 opposite to the connection portion 11. Correspondingly, the second fixed contact body 3 is welded to the side of the second short side 126 opposite to the connecting portion 11.

It can be easily found from the above description that, in the practical application process, as shown in fig. 1, the V-shaped groove 127 between the first short side 125 and the second short side 126 can automatically guide and position the movement of the movable contact body 4 of the movable contact, so that the movable contact body 4 can respectively abut against the first fixed contact body 2 and the second fixed contact body 3 when moving to the preset position in the direction of the V-shaped groove 127, thereby avoiding the short-time disengagement of the movable contact body 4 and the first fixed contact body 2 and the second fixed contact body 3 caused by the high-frequency vibration environment of the micro-gap switch, and improving the reliability of the micro-gap switch. Meanwhile, the first fixed contact body 2 and the second fixed contact body 3 are fixed by welding, so that the phenomenon that a metal coating on the surface of the contact body is damaged due to riveting of the first fixed contact body 2 and the second fixed contact body 3 can be effectively avoided, and the reliability of the movable contact body and the fixed contact body in contact is further improved.

Specifically, in the present embodiment, as shown in fig. 1, the connecting portion 11 is provided with a mounting hole 111, and the fixed contact holder 1 can be mounted and fixed through the mounting hole 111. Meanwhile, the first metal coating and the second metal coating are both gold-plated layers, and the gold-plated layers are used as the metal coatings, so that the sensitivity of the first fixed contact body 2 and the second fixed contact body 3 when contacting with the movable contact body 4 of the movable contact can be further improved. In addition, because the first fixed contact body 2 and the second fixed contact body 3 are only provided with the metal coatings on the surfaces thereof, the metal coatings can ensure that the first fixed contact body 2 and the second fixed contact body 3 are reliably contacted with the movable contact body, and meanwhile, the waste of gold layers is reduced, thereby reducing the production cost of the whole microswitch.

Note that, in the present embodiment, as shown in fig. 2, the flat sheet is formed by cutting a material tape which has been press-molded. Specifically, when the fixed contact of the present embodiment is processed, the fixed contact body 2 and the second fixed contact body 3 may be welded on the material tape in batch, and after the welding is completed, the material tape is continuously formed, so that the material tape forms a plurality of flat sheets that can be bent into the fixed contact support 1, and finally, each flat sheet is sequentially cut, as shown in fig. 2, and each flat sheet is bent, so as to form a plurality of fixed contact supports 1, as shown in fig. 3. Therefore, compared with the traditional contact body adopting the riveting process, the unreliable phenomenon that the movable contact body is abutted to the surface of the first fixed contact body 2 and the surface of the second fixed contact body 3 due to damage of the gold-plated layers caused by improper riveting can be avoided. In this way, too. The full-automatic gold layer forming machine can continuously form a flat sheet, a welding part and a final part from welding to welding, can completely depend on equipment to carry out full-automatic production, reduces waste in the utilization of a gold layer, and can complete production of parts only by using very little manpower.

Furthermore, as a preferable mode, in the present embodiment, as shown in fig. 4, a side of the first fixed contact body 2 facing away from the first short side 125 and a side of the second fixed contact body 3 facing away from the second short side 126 are both convex arc surfaces, so that both the first fixed contact body 2 and the second fixed contact body 3 are in point contact when abutting against the movable contact body 4, thereby further improving the reliability of the fixed contact and the movable contact when contacting.

A second embodiment of the present invention relates to a fixed contact mechanism, as shown in fig. 5 and 6, including: a moving contact holder (not shown), a moving contact body 4 welded to the moving contact holder, and a fixed contact as described in the first embodiment.

Specifically, in the present embodiment, as shown in fig. 5 and 6, the V-shaped groove 127 formed between the first short side 125 and the second short side 126 of the fixed contact and the movable contact body 4 are opposed to each other, and the movable contact holder can be used to bring the movable contact body 4 into linear motion with respect to the V-shaped groove 127. When the movable contact body 4 moves to a predetermined position toward the V-shaped groove 127, the movable contact body 4 may abut against the first fixed contact body 2 and the second fixed contact body 3, respectively.

Therefore, by means of the V-shaped groove 127 formed between the first short side 125 and the second short side 126, when the movable contact body 4 moves, the movable contact body 4 can be automatically guided, so that the movable contact body 4 can be reliably abutted against the first fixed contact body 2 and the second fixed contact body 3 respectively, the phenomenon that the movable contact body 4 is separated from the first fixed contact body 2 and the second fixed contact body 3 respectively in a short time due to a high-frequency vibration environment of the micro-switch is avoided, and the reliability of the micro-switch is improved.

In addition, it is worth mentioning that, by means of the gold plating layers on the surfaces of the first fixed contact body 2 and the second fixed contact body 3, the surface of the movable contact body 4 may also be provided with a third metal plating layer, and the third metal plating layer may also be a gold plating layer, so that the sensitivity of the movable contact body 4 in electrical contact with the first fixed contact body 2 and the second fixed contact body 3 respectively is further improved, and the instant sending of signals is ensured.

Furthermore, as shown in fig. 5 and 6, in the present embodiment, the movable contact body 4 is also a convex arc surface on the side opposite to the V-shaped groove 127, so that the movable contact body 4 can better electrically contact with the first fixed contact body 2 and the second fixed contact body 3, respectively, and the reliability of the movable contact body 4 in contacting with the first fixed contact body 2 and the second fixed contact body 3, respectively, is further improved.

A third embodiment of the present invention relates to a microswitch including a contact mechanism according to the second embodiment.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims

1. A stationary contact, comprising:

2. The fixed contact of claim 1, wherein the first and second metal plating layers are both gold plating layers.

3. The fixed contact point of claim 1, wherein a side of the first fixed contact point body facing away from the first short side and a side of the second fixed contact point body facing away from the second short side are both convex surfaces.

4. The fixed contact according to claim 1, wherein the connecting portion has a mounting hole formed therein.

5. The stationary contact according to any one of claims 1 to 4, wherein the flat sheet is formed by cutting a material strip which has been press-formed.

6. A contact mechanism, comprising: a moving contact bracket, a moving contact body welded on the moving contact bracket, and a fixed contact as claimed in any one of claims 1 to 5;

7. The contact mechanism of claim 6, wherein the third metal plating is gold plating.

8. The contact mechanism as claimed in claim 6, wherein a side of said movable contact body opposite to said V-shaped groove is a convex arc surface.

9. A micro-switch, comprising: a contact mechanism as claimed in any one of claims 6 to 8.