CN-122000245-A - Contact part and relay

Abstract

The invention relates to the technical field of electronic control devices, in particular to a contact part and a relay. The contact part is provided with at least two parallel branches which are arranged in the same current path in parallel, each parallel branch is provided with a contact group, each contact group comprises a movable contact and a static contact, at least two of the parallel branches form an alternating group, in the alternating group, the movable contact and/or the static contact of each contact group comprise at least two electric contact layers, and each electric contact layer is arranged along the height direction of the corresponding movable contact or static contact.

Inventors

• Zhang Jielang
• LI FANGNENG
• ZHONG SHUMING
• YIN JIANFENG

Assignees

• 厦门宏发电力电器有限公司

Dates

Publication Date

20260508

Application Date

20260127

Claims (20)

1. 1. The contact part is characterized by comprising at least two parallel branches which are arranged in parallel in the same current path, wherein each parallel branch is provided with a contact group, each contact group comprises a movable contact and a fixed contact, at least two of the parallel branches form an alternating group, and in the alternating group, the movable contact and/or the fixed contact of each contact group comprise at least two electric contact layers, and each electric contact layer is arranged along the height direction of the corresponding movable contact or fixed contact.
2. 2. The contact portion according to claim 1, wherein in the alternating groups, the movable contact on each of the parallel branches has a position in which at least one of the electric contact layers is located in a height direction of the movable contact that is different from a position in which any of the electric contact layers of the movable contacts of the other parallel branches is located, and/or wherein in the alternating groups, the stationary contact on each of the parallel branches has a position in which at least one of the electric contact layers is located in a height direction of the stationary contact that is different from a position in which any of the electric contact layers of the stationary contacts of the other parallel branches is located.
3. 3. The contact portion according to claim 2, wherein initial contact gaps of the contact groups corresponding to at least two of the parallel branches are not equal in the alternating groups; When the movable contact is disconnected from the stationary contact, in each parallel branch of the alternating group, the movable contact with smaller initial contact gap is disconnected from the stationary contact and is burnt so as to consume at least part of the electric contact layers which are close to each other.
4. 4. Contact portion according to claim 2, wherein in the alternating groups the initial contact gaps of the contact groups corresponding to at least two of the parallel branches are equal and adapted to form a gap difference in the (n+1) -th electrical contact layer of the moving contact and/or the (n+1) -th electrical contact layer of the stationary contact after combustion of the N-th electrical contact layer of the moving contact and/or the N-th electrical contact layer of the stationary contact.
5. 5. The contact portion according to claim 1, characterized in that in the alternating groups the number of electrical contact layers in the movable contacts in different parallel branches is identical and/or the number of electrical contact layers in the stationary contacts in different parallel branches is identical.
6. 6. The contact portion according to claim 1, wherein in the alternating groups the configuration of the movable contacts in different ones of the parallel branches is identical and/or wherein in the alternating groups the configuration of the stationary contacts in different ones of the parallel branches is identical.
7. 7. The contact portion according to claim 1, wherein the number of electrical contact layers in each of the movable contacts is the same and/or the number of electrical contact layers in each of the stationary contacts is the same when the same parallel branch has at least two of the contact groups in the alternating groups.
8. 8. The contact portion according to claim 1, wherein a gap is provided between adjacent ones of the electric contact layers in the movable contact and the stationary contact.
9. 9. The contact portion according to claim 1, wherein each of the movable contacts comprises at least two of the electrical contact layers, a projected area of an electrical contact layer closest to the stationary contact in a first set plane is smaller than a projected area of other electrical contact layers in the first set plane, and/or each of the stationary contacts comprises at least two electrical contact layers, a projected area of an electrical contact layer closest to the movable contact in a second set plane is smaller than a projected area of other electrical contact layers in the second set plane, wherein the first set plane is perpendicular to a height direction of the movable contact, and the second set plane is perpendicular to a height direction of the stationary contact.
10. 10. The contact portion according to claim 9, wherein a projected area of an electric contact layer close to the stationary contact in a first setting plane is smaller than a projected area of an electric contact layer away from the stationary contact in a first setting plane in any two adjacent electric contact layers on each of the movable contacts, and/or a projected area of an electric contact layer close to the movable contact in the second setting plane is smaller than a projected area of an electric contact layer away from the movable contact in the second setting plane in any two adjacent electric contact layers on each of the stationary contacts.
11. 11. The contact portion according to claim 1, wherein the projected area of each of the electrical contact layers in the movable contact in a first set plane is the same and/or the projected area of each of the electrical contact layers in the stationary contact in a second set plane is the same, wherein the first set plane is perpendicular to the height direction of the movable contact and the second set plane is perpendicular to the height direction of the stationary contact.
12. 12. The contact portion according to claim 1, wherein each of the electric contact layers in the movable contact has a spherical cap curved surface protruding toward the stationary contact, and wherein the centers of the electric contact layers are coaxially disposed, and/or each of the electric contact layers in the stationary contact has a spherical cap curved surface protruding toward the movable contact, and wherein the centers of the electric contact layers are coaxially disposed.
13. 13. The contact portion of claim 12, wherein each of the movable contact and the stationary contact includes at least two electrical contact layers, and at least a portion of a central portion of each of the electrical contact layers is of sheet-like configuration and is shaped as a spherical cap curve.
14. 14. The contact of claim 1, wherein the electrical contact layers are affixed to each other in alternating sets on the same movable contact or the same stationary contact to form a contact, and wherein the contact has a stepped edge.
15. 15. The contact portion according to claim 1, wherein all of the parallel branches constitute an alternating group, and/or the number of the parallel branches is two and each constitutes an alternating group.
16. 16. The contact portion according to claim 1, wherein in the alternating groups, the electrical contact layers are fixedly connected to each other on the same movable contact or the same stationary contact to constitute a contact portion, each contact portion is formed by upsetting or welding the superimposed electrical contact layers, or is formed by integral upsetting, and an edge of the contact portion is formed in a stepped shape by integral upsetting.
17. 17. The contact of any one of claims 1 to 16, wherein each of the electrical contact layers is made of a pure metal, a metal alloy or a cermet material that is electrically conductive.
18. 18. The contact portion according to any one of claims 1 to 16, comprising at least two moving contacts having an extending direction, a first stationary contact and a second stationary contact, both ends of the extending direction of the moving contacts being provided with the moving contacts; the first static contact piece is provided with at least two first static contacts, the number of the first static contacts on the first static contact piece is the same as the number of the movable contacts at one end of each movable contact piece and corresponds to one another, the second static contact piece is provided with at least two second static contacts, the number of the second static contacts on the second static contact piece is the same as the number of the movable contacts at the other end of each movable contact piece and corresponds to one another, and the parallel branch is composed of one movable contact piece, movable contacts positioned at two ends of the extending direction of the movable contact piece, and first static contacts and second static contacts respectively corresponding to the two movable contacts.
19. 19. The contact portion according to any one of claims 1 to 16, comprising a swinging member and a stationary contact member, the swinging member including at least two branch portions each provided with the movable contact, the stationary contact member being provided with at least two stationary contacts each corresponding to each of the movable contacts, the swinging member being capable of swinging so as to bring the movable contact into contact with or separate from the corresponding stationary contact, wherein the parallel branch is constituted by one of the branch portions, a movable contact provided to the branch portion, and the stationary contact corresponding to the movable contact.
20. 20. A relay comprising the contact portion according to any one of claims 1 to 19.

Description

Contact part and relay Technical Field The invention relates to the technical field of electronic control devices, in particular to a contact part and a relay. Background A relay is an electronic control device having a control system (also called an input loop) and a controlled system (also called an output loop), which is generally used in an automatic control circuit. A relay is in fact an "automatic switch" that uses a smaller current to control a larger current. Therefore, the circuit plays roles of automatic adjustment, safety protection, circuit switching and the like. The relay includes a contact portion having a contact group (including a movable contact and a stationary contact) that can be turned on or off for switching an external circuit. In general, the contact portion is typically provided with at least two sets of contacts connected in parallel to reduce contact load and improve current carrying capacity, and to reduce contact resistance, reduce temperature rise, and improve performance reliability by shunting. However, in practice, the relay adopting a plurality of contact sets connected in parallel is easy to fail prematurely and has short service life, and is difficult to meet the demands of customers. Disclosure of Invention The embodiment of the invention provides a contact part and a relay so as to prolong the service life of the relay. The contact part provided by the embodiment of the invention is provided with at least two parallel branches which are arranged in the same current path in parallel, wherein each parallel branch is provided with a contact group, each contact group comprises a movable contact and a fixed contact, at least two of the parallel branches form an alternating group, in the alternating group, the movable contact and/or the fixed contact of each contact group comprise at least two electric contact layers, and each electric contact layer is arranged along the height direction of the corresponding movable contact or fixed contact. According to some embodiments of the invention, the movable contact on each parallel branch has a position of at least one of the electrical contact layers in the height direction of the movable contact that is different from a position of any of the electrical contact layers of the movable contacts of the other parallel branches, and/or the stationary contact on each parallel branch has a position of at least one of the electrical contact layers in the height direction of the stationary contact that is different from a position of any of the electrical contact layers of the other parallel branches. According to some embodiments of the invention, in the alternating groups, initial contact gaps of the contact groups corresponding to at least two of the parallel branches are not equal; When the movable contact is disconnected from the stationary contact, in each parallel branch of the alternating group, the movable contact with smaller initial contact gap is disconnected from the stationary contact and is burnt so as to consume at least part of the electric contact layers which are close to each other. According to some embodiments of the invention, in the alternating groups, initial contact gaps of the contact groups corresponding to at least two parallel branches are equal, and the alternating groups are suitable for forming gap differences between the nth electric contact layer of the movable contact and/or the nth electric contact layer of the stationary contact after burning. According to some embodiments of the invention, in the alternating groups, the number of electrical contact layers in the moving contacts in different ones of the parallel branches is uniform and/or the number of electrical contact layers in the stationary contacts in different ones of the parallel branches is uniform. According to some embodiments of the invention, the configuration of the movable contacts in different ones of the parallel branches is uniform in the alternating groups, and/or the configuration of the stationary contacts in different ones of the parallel branches is uniform in the alternating groups. According to some embodiments of the invention, when the same parallel branch has at least two of the contact sets in the alternating sets, the number of electrical contact layers in each of the movable contacts is the same and/or the number of electrical contact layers in each of the stationary contacts is the same. According to some embodiments of the invention, a gap is provided between adjacent ones of the electrical contact layers in the movable contact and the stationary contact. According to some embodiments of the invention, each movable contact comprises at least two electric contact layers, the projection area of the electric contact layer closest to the movable contact in a first set plane is smaller than the projection area of other electric contact layers in the first set plane, and/or each movable contact comprises at least two electric