Contact portion 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, and 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 groups, the movable contact and / or the static contact of each contact group comprises 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.

Description

Technical Field

[0001] This invention relates to the field of electronic control device technology, and more specifically, to a contact portion and a relay. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] A relay includes a contact portion with a set of contacts (including moving contacts and stationary contacts) that can be turned on or off to switch on and off external circuits. Generally, the contact portion is provided with at least two sets of contacts connected in parallel to reduce contact load and increase current carrying capacity by shunting, as well as to reduce contact resistance, reduce temperature rise, and improve performance reliability.

[0004] However, in practice, it has been found that relays using multiple sets of parallel contact groups are prone to premature failure and short service life, making it difficult to meet customer needs. Summary of the Invention

[0005] This invention provides a contact portion and a relay to extend the service life of the relay.

[0006] The contact portion provided in this embodiment of the invention has at least two parallel branches arranged in parallel in the same current path. Each parallel branch has a contact group, and each contact group includes a moving contact and a stationary contact. At least two of the parallel branches constitute an alternating group. In the alternating group, the moving contact and / or stationary contact of each contact group includes at least two electrical contact layers, and each electrical contact layer is arranged along the height direction of the corresponding moving contact or stationary contact.

[0007] According to some embodiments of the present invention, in the alternation group, each of the moving contacts on the parallel branch has at least one electrical contact layer whose position along the height direction of the moving contact is different from the position of any electrical contact layer in the moving contacts of the other parallel branches; and / or, in the alternation group, each of the stationary contacts on the parallel branch has at least one electrical contact layer whose position along the height direction of the stationary contact is different from the position of any electrical contact layer in the stationary contacts of the other parallel branches.

[0008] According to some embodiments of the present invention, in the alternation group, the initial contact gaps of the contact groups corresponding to at least two of the parallel branches are not equal; When the moving contact disconnects from the stationary contact, in each of the parallel branches of the alternating group, the moving contact with the smaller initial contact gap disconnects from the stationary contact and ignites an arc to consume at least a portion of the electrical contact layer that is close to each other.

[0009] According to some embodiments of the present invention, in the alternating group, the initial contact gaps of the contact groups corresponding to at least two of the parallel branches are equal, and are adapted to form a gap difference in the Nth electrical contact layer of the moving contact and / or the Nth electrical contact layer of the stationary contact after the Nth electrical contact layer of the moving contact and / or the Nth electrical contact layer of the stationary contact are burned.

[0010] According to some embodiments of the present invention, in the alternating groups, the number of electrical contact layers in the moving contacts of different parallel branches is consistent, and / or the number of electrical contact layers in the stationary contacts of different parallel branches is consistent.

[0011] According to some embodiments of the present invention, in the alternation group, the moving contacts in the different parallel branches have the same construction, and / or, in the alternation group, the stationary contacts in the different parallel branches have the same construction.

[0012] According to some embodiments of the present invention, in the alternating group, when the same parallel branch has at least two of the contact groups, the number of electrical contact layers in each of the moving contacts is the same, and / or the number of electrical contact layers in each of the stationary contacts is the same.

[0013] According to some embodiments of the present invention, there is a gap between adjacent electrical contact layers in the moving contact and the stationary contact.

[0014] According to some embodiments of the present invention, each of the moving contacts includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the stationary contact in a first defined plane is smaller than the projected area of ​​the other electrical contact layers in the first defined plane; and / or, each of the stationary contacts includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the moving contact in a second defined plane is smaller than the projected area of ​​the other electrical contact layers in the second defined plane; wherein, the first defined plane is perpendicular to the height direction of the moving contact; and the second defined plane is perpendicular to the height direction of the stationary contact.

[0015] According to some embodiments of the present invention, on each of the moving contacts, in any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the stationary contact in the first set plane is smaller than the projected area of ​​the electrical contact layer farther from the stationary contact in the first set plane; and / or, on each of the stationary contacts, in any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the moving contact in the second set plane is smaller than the projected area of ​​the electrical contact layer farther from the moving contact in the second set plane.

[0016] According to some embodiments of the present invention, the projected areas of each electrical contact layer in the moving contact are the same in a first set plane, and / or the projected areas of each electrical contact layer in the stationary contact are the same in a second set plane; wherein, the first set plane is perpendicular to the height direction of the moving contact; and the second set plane is perpendicular to the height direction of the stationary contact.

[0017] According to some embodiments of the present invention, each of the electrical contact layers in the moving contact has a spherical cap surface protruding toward the stationary contact, and the centers of each electrical contact layer are coaxially arranged; and / or, each of the electrical contact layers in the stationary contact has a spherical cap surface protruding toward the moving contact, and the centers of each electrical contact layer are coaxially arranged.

[0018] According to some embodiments of the present invention, each of the moving contacts and the stationary contacts includes at least two electrical contact layers, and at least a portion of the middle part of each electrical contact layer is a sheet-like structure with a spherical cap surface shape.

[0019] According to some embodiments of the present invention, in the alternating group, on the same moving contact or the same stationary contact, each of the electrical contact layers is fixed to each other to form a contact portion; the edge of the contact portion is stepped.

[0020] According to some embodiments of the present invention, all of the parallel branches constitute an alternating group; and / or, the number of the parallel branches is two, and both constitute an alternating group.

[0021] According to some embodiments of the present invention, in the alternating group, on the same moving contact or the same stationary contact, each of the electrical contact layers is fixed to each other to form a contact portion; each of the contact portions is formed by upsetting or welding the superimposed electrical contact layers, or by integral upsetting; when formed by integral upsetting, the edge of the contact portion is formed into a stepped shape.

[0022] According to some embodiments of the present invention, the material of each of the electrical contact layers is a conductive pure metal, metal alloy or metal ceramic material.

[0023] According to some embodiments of the present invention, the device includes at least two moving contacts, a first stationary contact, and a second stationary contact. The moving contacts have an extending direction, and the moving contact points are provided at both ends of the extending direction of the moving contact. The extending directions of each moving contact are the same, and the thickness directions of each moving contact are the same. The first stationary contact has at least two first stationary contacts, and the number of the first stationary contacts on the first stationary contact is the same as the number of the moving contacts at one end of each of the moving contacts, and they correspond one-to-one. The second stationary contact has at least two second stationary contacts, and the number of the second stationary contacts on the second stationary contact is the same as the number of the moving contacts at the other end of each of the moving contacts, and they correspond one-to-one. The parallel branch consists of a moving contact, moving contacts at both ends of the moving contact in the extension direction, and first and second stationary contacts corresponding to the two moving contacts respectively.

[0024] According to some embodiments of the present invention, a swing member and a stationary contact member are included. The swing member includes at least two branches, each of which is provided with a moving contact. The stationary contact member is provided with at least two stationary contacts, each of which corresponds to a moving contact. The swing member is capable of swinging to make the moving contact contact or separate from the corresponding stationary contact. The parallel branch is composed of one branch, a moving contact provided in the branch, and a stationary contact corresponding to the moving contact.

[0025] The relay provided in this embodiment of the invention includes the contact portion described in any of the above embodiments.

[0026] Through continuous observation, experimentation, and research, the applicant discovered that the technical problems of existing relays using multiple parallel contact groups—namely, premature failure, short service life, and difficulty in meeting customer needs—stem from the fact that in existing parallel contact group schemes, all contact groups typically arc, or arc is concentrated in a few groups while others do not arc (only used for current carrying). The contacts used for arcing are prone to failure, resulting in short lifespans and impacting the overall electrical life of the relay product. Another existing approach is to use high-temperature resistant, arc-resistant materials (such as tungsten alloys) to make the arc-arcing contact groups; however, these materials typically have high contact resistance, poor conductivity, and high cost.

[0027] Based on this, any of the above embodiments of the present invention has at least the following beneficial effects: (1) The contact portion provided in the embodiments of the present invention has at least two parallel branches arranged in parallel in the same current path. At least two of the parallel branches constitute an alternating group. In the alternating group, the moving contact of each parallel branch is configured with at least two electrical contact layers arranged along the height direction of the moving contact, and / or the stationary contact of each parallel branch is configured with at least two electrical contact layers arranged along the height direction of the stationary contact. This makes the contact position and arcing position of the contact no longer limited to a single position, but can be changed by consuming electrical contact layers to change the contact position and arcing position of the moving contact and / or the stationary contact. And through the cooperation between different parallel branches, "alternating arcing" between different parallel branches can be achieved. Specifically, when the moving contact and / or the stationary contact of each parallel branch in the alternating group is designed to have multiple electrical contact layers, due to manufacturing and assembly errors... The presence of this technology causes the electrical contact layers between parallel branches to form a staggered distribution. This allows for gap differences in the electrical contact layers after disconnection and arcing due to physical wear. When some electrical contact layers in one parallel branch wear out and the contact gap widens, the next disconnection will switch to arcing in other parallel branches. Even if the height and position of each electrical contact layer are the same, the different activity levels of each electrical contact layer during arcing will cause different parallel branches to alternately arc at different disconnection stages. This prevents one set of contacts from failing prematurely due to continuous arcing, ensuring the reliability of the contact parts and thus improving the service life of the relay. Since there is no need to use high-temperature resistant and arc-resistant materials to improve the arc resistance of the moving and / or stationary contacts, the contact resistance of the contact parts is low, the contact performance is good, and the manufacturing cost is low.

[0028] (2) In the contact portion provided in the embodiments of the present invention, at least some of the electrical contact layers in the moving contacts of each parallel branch of the alternating group are staggered in the height direction, and / or at least some of the electrical contact layers in the stationary contacts of each parallel branch of the alternating group are staggered in the height direction. This positional difference in the height direction is directly converted into the action timing difference of each parallel branch in the alternating group during the closing or opening process, thereby ensuring the realization of alternating arcing in the physical structure; through this positional gradient, the dynamic rotation of arcing between different parallel branches is realized, effectively preventing early failure of a specific contact group due to continuous arcing, and improving the overall electrical resistance and service life of the contact portion.

[0029] (3) In the contact portion provided in the embodiment of the present invention, since the initial contact gaps of the contact groups corresponding to at least two parallel branches are not equal, the moving contact and the stationary contact with the smaller initial contact gap will disconnect later and consume at least a portion of the electrical contact layer that is close to each other. When the electrical contact layer that is close to each other is consumed to the point that the contact gap is greater than the larger initial contact gap of the contact group corresponding to other parallel branches, the next disconnection will switch to the arcing between the moving and stationary contacts corresponding to the larger initial contact gap. Alternating arcing is achieved in the early stage of use, which is beneficial to increase the number of alternating arcing and extend the service life of the relay.

[0030] (4) By setting the initial contact gap of the contact group corresponding to at least two parallel branches in the alternating group to be equal, the mechanical synchronization and current carrying balance of the relay in the early stage of use are guaranteed. By utilizing the electrical loss characteristics of the contacts in actual operation, when there is a misalignment of each parallel branch in the (N+1)th layer of electrical contact, the Nth layer of electrical contact that ignites first will naturally produce physical size reduction after ablation, thereby automatically forming a gap difference in the height direction between the other parallel branches in the remaining electrical contact layers. This gap difference based on loss can realize the alternation of the arc position in the (N+1)th layer and subsequent layers, so that the contact part can automatically and cyclically transfer the arc load from the worn layer to the new electrical contact layer as the number of uses increases, thus extending the service life of the relay.

[0031] (5) In the alternating group, the number of electrical contact layers in the moving contacts of different parallel branches is consistent, and / or the number of electrical contact layers in the stationary contacts of different parallel branches is consistent. This not only simplifies the manufacturing process of the multi-contact system, but also makes the performance degradation trend of the entire contact part in the whole life cycle more synchronous, ensuring that each layer of material can be fully utilized in the alternating arcing process, thereby extending the service life of the relay as a whole.

[0032] (6) The spherical cap surface design with relatively raised moving and stationary contacts ensures precise point-to-point contact during each closure. Since the spherical cap surfaces of each layer are coaxially aligned, the center position forms the location used to determine the contact gap, ensuring the reliability of alternating arcing formed by the height difference. At the same time, the spherical cap surface allows the arc to concentrate and not easily slide outwards, thus achieving rapid arc extinguishing and reducing wear. This design not only ensures the reliability of the contact but also maximizes the lifespan of the multi-layer structure, making the relay work longer and more stably. Attached Figure Description

[0033] Figure 1 The diagram shown is a structural schematic of the contact portion provided in an embodiment of the present invention (the moving and stationary contacts are in a separated state). Figure 2 The diagram shown is a structural schematic of the contact portion provided in an embodiment of the present invention (with the moving and stationary contacts in a contact state). Figure 3 The diagram shown is a schematic representation of the internal structure of a relay provided in an embodiment of the present invention; Figure 4 What is shown is Figure 3 A sectional view along line AA; Figure 5 The diagram shown is a schematic diagram of another internal structure of the relay provided in an embodiment of the present invention; Figure 6 What is shown is Figure 5 A sectional view along line BB; Figure 7 This is a schematic diagram of one structure of the first moving contact; Figure 8 What is shown is Figure 7 A cross-sectional view along the CC line; Figure 9 The diagram shown is a schematic of a second structure for the first moving contact; Figure 10 What is shown is Figure 9 A cross-sectional view along line DD; Figure 11 The diagram shown is a third structural schematic of the first moving contact; Figure 12 What is shown is Figure 11 A cross-sectional view along the EE line; Figure 13 The diagram shown is another structural schematic of the contact portion provided in an embodiment of the present invention.

[0034] The annotations in the attached figures are explained as follows: 100. Parallel branch; 101. Moving contact; 102. Stationary contact; 10. Moving contact element; 11. First moving contact element; 111. First moving contact element; 1111. First electrical contact layer; 11110. Boundary position; 112. Second moving contact element; 12. Second moving contact element; 21. First stationary contact element; 2111. First stationary contact element; 2111. Second electrical contact layer; 22. Second stationary contact element; 221. Second stationary contact element; 30. Swinging element; 31. Branch. Detailed Implementation

[0035] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0036] See Figures 1 to 13 As shown, an embodiment of the present invention provides a contact portion having at least two parallel branches 100 arranged in parallel in the same current path. Each parallel branch 100 has a contact group, and each contact group includes a moving contact 101 and a stationary contact 102. At least two of the parallel branches 100 constitute an alternating group. In the alternating group, the moving contact 101 and / or the stationary contact 102 of each contact group includes at least two electrical contact layers. Each electrical contact layer is arranged along the height direction of the corresponding moving contact 101 or stationary contact 102 (in this embodiment, the height directions of the moving contact 101 and the stationary contact 102 are the same, as indicated by the arrow direction D1).

[0037] The contact portion provided in this embodiment of the invention has at least two parallel branches 100 arranged in parallel in the same current path. At least two of the parallel branches 100 constitute an alternating group. In the alternating group, the moving contact 101 of each parallel branch 100 is configured with at least two electrical contact layers arranged along the height direction of the moving contact 101, and / or the stationary contact 102 of each parallel branch 100 is configured with at least two electrical contact layers arranged along the height direction of the stationary contact 102. This allows the contact position and arcing position of the contact to be no longer limited to a single position, but to be able to change the contact position and arcing position of the moving contact 101 and / or the stationary contact 102 by consuming electrical contact layers. Furthermore, through the cooperation between different parallel branches 100, "alternating arcing" between different parallel branches 100 can be achieved. Specifically, this is achieved when at least the moving contact 101 and / or the stationary contact 102 of each parallel branch 100 in the alternating group are designed to have multiple electrical contact layers. Due to manufacturing and assembly errors, the electrical contact layers of each parallel branch 100 are misaligned. This causes gap differences in each parallel branch 100 due to physical wear of the electrical contact layers after disconnection and arcing. When part of the electrical contact layer on one parallel branch 100 is worn and the contact gap increases, the next disconnection will switch to other parallel branches 100 for arcing. Even if the height and position of each electrical contact layer are the same, the different activity of each electrical contact layer during arcing will cause different parallel branches 100 to alternately arc at different disconnection stages. This prevents one set of contacts from failing prematurely due to being constantly in an arcing state, ensuring the reliability of the contact part and thus improving the service life of the relay. Since there is no need to use high-temperature resistant and arc-resistant materials to improve the arc resistance of the moving contact 101 and / or the stationary contact 102, the contact resistance of the contact part is low, the contact performance is good, and the manufacturing cost is low.

[0038] It should be understood that alternating arc burning does not necessarily have to follow an extremely strict specific sequence.

[0039] In some embodiments, see Figure 1 As shown, in the alternating group, the moving contact 101 of each contact group includes at least two electrical contact layers, which are named first electrical contact layers 1111, and each first electrical contact layer 1111 is arranged along the height direction of the corresponding moving contact 101; the stationary contact 102 of each contact group includes at least two electrical contact layers, which are named second electrical contact layers 2111, and each second electrical contact layer 2111 is arranged along the height direction of the corresponding stationary contact 102.

[0040] In other embodiments, the moving contact 101 may include at least two first electrical contact layers 1111, each first electrical contact layer 1111 being arranged along the height direction of the corresponding moving contact 101; or the stationary contact 102 of each contact group may include at least two second electrical contact layers 2111, each second electrical contact layer 2111 being arranged along the height direction of the corresponding stationary contact 102.

[0041] For example, there can be two parallel branches 100, and the contact groups on the two parallel branches 100 alternately ignite the arc. When there are three or more parallel branches 100, the contact groups on each parallel branch 100 can alternately ignite the arc in a specific order or not in a specific order.

[0042] In some embodiments, in the alternation group, each moving contact 101 on the parallel branch 100 has at least one first electrical contact layer 1111, the position of which along the height direction of the moving contact 101 is different from the position of any first electrical contact layer 1111 in the moving contact 101 of the other parallel branch 100; each stationary contact 102 on the parallel branch 100 has at least one second electrical contact layer 2111, the position of which along the height direction of the stationary contact 102 is different from the position of any second electrical contact layer 2111 in the stationary contact 102 of the other parallel branch 100.

[0043] In this embodiment, at least a portion of the first electrical contact layers 1111 in the moving contacts 101 of each parallel branch 100 of the alternating group are staggered in the height direction, and at least a portion of the second electrical contact layers 2111 in the stationary contacts 102 of each parallel branch 100 of the alternating group are staggered in the height direction. This positional difference in the height direction is directly converted into a difference in the action timing of each parallel branch 100 in the alternating group during the closing or opening process, thereby ensuring the realization of alternating arcing in the physical structure. Through this positional gradient, the arcing is dynamically rotated between different parallel branches 100, effectively preventing premature failure of a specific contact group due to continuous arcing, and improving the overall electrical resistance and service life of the contact part.

[0044] In other embodiments, in the alternating group, each moving contact 101 on each parallel branch 100 may have at least one first electrical contact layer 1111 whose position along the height direction of the moving contact 101 is different from the position of any first electrical contact layer 1111 of the moving contacts 101 in the other parallel branches 100; or in the alternating group, each stationary contact 102 on each parallel branch 100 may have at least one second electrical contact layer 2111 whose position along the height direction of the stationary contact 102 is different from the position of any second electrical contact layer 2111 of the stationary contacts 102 in the other parallel branches 100.

[0045] In some embodiments, the contact portion includes at least two moving contacts 10, a first stationary contact 21, and a second stationary contact 22, as referenced. Figure 1 and Figure 2 Each moving contact 10 can be arranged along the arrow direction D2. The moving contact 10 has an extension direction (indicated by the arrow direction D3). Both ends of the extension direction of the moving contact 10 are provided with moving contacts 101. Among them, the arrow directions D1, D2 and D3 are perpendicular to each other. The extension directions of each moving contact 10 are the same, and the thickness directions of each moving contact 10 are the same (all located in the D1 direction). The first stationary contact 21 is provided with at least two first stationary contacts 211. The first stationary contacts 211 on the first stationary contact 21 are connected to each moving contact 101. The number of moving contacts 101 at one end of each moving contact 10 is the same and they correspond one-to-one. The second stationary contact 22 is provided with at least two second stationary contacts 221, and the number of second stationary contacts 221 on the second stationary contact 22 is the same and they correspond one-to-one with the number of moving contacts 101 at the other end of each moving contact 10. The parallel branch 100 is composed of a moving contact 10, moving contacts 101 at both ends of the extending direction of the moving contact 10, and first stationary contacts 211 and second stationary contacts 221 corresponding to the two moving contacts 101 respectively. This multi-contact parallel structure plays a role in current shunting. On the one hand, it helps to reduce the temperature rise near the contacts. On the other hand, it also helps to reduce the electrodynamic repulsion between the moving contacts 101 and the stationary contacts 102. In addition, the parallel structure of two adjacent moving contacts 10 can reduce the total contact resistance to meet the relay performance requirements. Since the extension direction of each moving contact 10 is consistent and the thickness direction of each moving contact 10 is consistent, the compactness of each parallel branch 100 in spatial layout is ensured. At the same time, since the contact part adopts the structure of two moving contacts 101 connected in series, a large gap design can be achieved. The total gap between the moving contact 101 and the stationary contact 102 is equal to the sum of the gaps between the two moving contacts 101 and their respective corresponding stationary contacts 102, thereby reducing the movement stroke.

[0046] For example, refer to Figure 3 and Figure 4 There are two moving contacts 10, and correspondingly, there are four moving contacts 101. There are four sets of moving and stationary contacts. When subjected to high current and voltage loads, the four sets of moving and stationary contacts play the role of voltage division in series structure and current division in parallel structure, reducing the load on the contacts, improving the performance of the relay, and improving reliability.

[0047] In other embodiments, the number of moving contacts 10 may also be three or more.

[0048] In some embodiments, in the alternating group, the initial contact gaps of the contact groups corresponding to at least two parallel branches 100 are not equal; when the moving contact 101 and the stationary contact 102 disconnect, in each parallel branch 100 of the alternating group, the moving contact 101 and the stationary contact 102 with the smaller initial contact gap disconnect and arc, thereby consuming at least a portion of the adjacent electrical contact layers. Here, the initial contact gap refers to the distance between the adjacent electrical contact layers of the moving contact 101 and the stationary contact 102 in each parallel branch 100 before arcing.

[0049] See Figures 1 to 4 As shown, the two moving contacts 10 are a first moving contact 11 and a second moving contact 12, respectively. The first moving contact 11 and the second moving contact 12 have the same extension direction and are connected in parallel. A first moving contact 111 is provided at one end of the first moving contact 11 and the second moving contact 12 along their extension direction, and a second moving contact 112 is provided at the other end of the first moving contact 11 and the second moving contact 12 along their extension direction. The number of first stationary contacts 211 on the first stationary contact 21 is the same as the number of first moving contacts 111 and they correspond one-to-one. The number of second stationary contacts 221 on the second stationary contact 22 is the same as the number of second moving contacts 112 and they correspond one-to-one.

[0050] Taking two parallel branches 100 as an example, one parallel branch 100 is composed of a first moving contact 11, a first moving contact 111 and a second moving contact 112 located at both ends of the extension direction of the first moving contact 11, and a first stationary contact 211 and a second stationary contact 221 corresponding to the first moving contact 111 and the second moving contact 112 respectively; the other parallel branch 100 is composed of a second moving contact 12, a first moving contact 111 and a second moving contact 112 located at both ends of the extension direction of the second moving contact 12, and a first stationary contact 211 and a second stationary contact 221 corresponding to the first moving contact 111 and the second moving contact 112 respectively.

[0051] See Figure 4As shown, the contact gap L1 between the first moving contact 111 and the corresponding first stationary contact 211 of the first moving contact 11 is not equal to the contact gap L2 between the first moving contact 111 and the corresponding first stationary contact 211 of the second moving contact 12. That is, without arcing, the distance between the close electrical contact layers of the first moving contact 111 and the corresponding first stationary contact 211 of the first moving contact 11 is L1, and the distance between the close electrical contact layers of the first moving contact 111 and the corresponding first stationary contact 211 of the second moving contact 12 is L2. Since L1 and L2 are not equal, after use, the moving and stationary contacts with smaller contact gaps will break later to consume at least a portion of the close electrical contact layers. For example, if L1 is less than L2, then during breaking, the first moving contact 111 and the corresponding first stationary contact 211 of the second moving contact 12 will break first without arcing. The moving contact 111 and the corresponding first stationary contact 211 will disconnect and ignite later, consuming the electrical contact layers that are close to each other. When the electrical contact layers that are close to each other are consumed to the point that the contact gap is greater than the contact gap between the first moving contact 111 and the corresponding first stationary contact 211 of the second moving contact 12, the next disconnection will switch to ignition between the first moving contact 111 and the corresponding first stationary contact 211 of the second moving contact 12. Alternating ignition is achieved in the early stage of use, which is beneficial to increase the number of alternating ignitions and extend the service life of the relay. If there are other misaligned electrical contact layers between the first moving contact 111 and / or the corresponding first stationary contact 211 of the first moving contact 11 and the first moving contact 12 and / or the corresponding first stationary contact 211 of the second moving contact 12, then in subsequent use, the disconnection will be further generated based on the above rules, forming the effect of later disconnection ignition and replacement ignition.

[0052] In some embodiments, in the alternating group, the initial contact gaps of the contact groups corresponding to at least two parallel branches 100 are equal, and are adapted to form a gap difference between the (N+1)th first electrical contact layer 1111 of the moving contact 101 and the (N+1)th second electrical contact layer 2111 of the stationary contact 102 after the Nth first electrical contact layer 1111 of the moving contact 101 and the Nth second electrical contact layer 2111 of the stationary contact 102 have burned. Wherein, N is greater than or equal to 1.

[0053] In other embodiments, in the alternating group, the initial contact gaps of the contact groups corresponding to at least two parallel branches 100 are equal, and are adapted to form a gap difference in the (N+1)th first electrical contact layer 1111 of the moving contact 101 after the Nth first electrical contact layer 1111 of the moving contact 101 is burned. Wherein, N is greater than or equal to 1.

[0054] In other embodiments, in the alternating group, the initial contact gaps of the contact groups corresponding to at least two parallel branches 100 are equal, and are adapted to form a gap difference in the (N+1)th second electrical contact layer 2111 of the stationary contact 102 after the Nth second electrical contact layer 2111 of the stationary contact 102 is burned. Wherein, N is greater than or equal to 1.

[0055] By setting the initial contact gaps of the contact groups corresponding to at least two parallel branches 100 within the alternating group to be equal, the mechanical synchronization and current carrying balance of the relay in the early stages of use are guaranteed. Utilizing the electrical loss characteristics of the contacts in actual operation, when there is a misalignment of each parallel branch 100 in the (N+1)th layer of electrical contact, the Nth layer of electrical contact that ignites first will naturally experience physical size reduction after ablation. This will automatically create a height gap difference between the Nth and Nth layers of electrical contact and other parallel branches 100. This gap difference based on loss can achieve the alternation of the arcing position in the (N+1)th layer and subsequent layers, allowing the contact part to automatically and cyclically transfer the arcing load from the worn layer to the new electrical contact layer as the number of uses increases, thus extending the service life of the relay.

[0056] In some embodiments, in the alternating group, the number of first electrical contact layers 1111 in the moving contacts 101 of different parallel branches 100 is the same, and the number of second electrical contact layers 2111 in the stationary contacts 102 of different parallel branches 100 is the same. This not only simplifies the manufacturing process of the multi-contact system, but also makes the performance degradation trend of the entire contact part tend to be synchronized throughout the entire life cycle, ensuring that each layer of material can be fully utilized during the alternating arcing process, thereby extending the overall service life of the relay.

[0057] In other embodiments, in the alternating group, the number of first electrical contact layers 1111 in the moving contacts 101 of different parallel branches 100 may be the same, or the number of second electrical contact layers 2111 in the stationary contacts 102 of different parallel branches 100 may be the same.

[0058] In some embodiments, within the alternating group, the moving contacts 101 in different parallel branches 100 have the same construction, and the stationary contacts 102 in different parallel branches 100 have the same construction. This ensures standardization of physical parameters such as mechanical strength and conductivity among the parallel branches 100, effectively reducing uneven stress or current distribution deviations caused by component heterogeneity. When there are differences in fitting height or contact gap, this structural consistency ensures that each parallel branch 100 possesses the same dynamic response characteristics and tolerance limit when participating in alternating arcing, thereby guaranteeing a smooth transition of arcing load when switching between parallel branches 100. Furthermore, structural consistency greatly simplifies the processing, assembly, and inspection procedures of the components, reduces production costs, and achieves controllable and consistent overall electrical life of the contact parts through the balanced loss rate of each parallel branch 100.

[0059] It should be noted that, taking the moving contact 101 as an example, consistent construction means that the components of the moving contact 101 in different parallel branches 100 are organized in the same way and have the same structural relationship. It can also be understood as being made of the same materials and using the same process. Its purpose is to facilitate manufacturing and save costs. However, it should be understood that even if the materials and processes are the same, manufacturing errors cannot be avoided. When manufacturing errors exist, there will inevitably be at least some deviations in the height position of the electrical contact layer between different contacts.

[0060] In other embodiments, the moving contacts 101 in different parallel branches 100 may have the same construction in the alternation group, or the stationary contacts 102 in different parallel branches 100 may have the same construction in the alternation group.

[0061] In some embodiments, when the same parallel branch 100 has at least two contact groups in the alternating group, the number of electrical contact layers in each moving contact 101 is the same, and the number of electrical contact layers in each stationary contact 102 is the same. This helps to reduce the risk of uneven distribution of electrical stress within a single parallel branch 100 due to differences in contact structure, so that the branch can be switched as a stable whole unit when participating in alternating arcing, reducing the risk of local failure caused by premature burn-through of a moving contact 101 or stationary contact 102 within the parallel branch 100.

[0062] In other embodiments, when the same parallel branch 100 has at least two contact groups in the alternating group, the number of electrical contact layers in each moving contact 101 may be the same, or the number of electrical contact layers in each stationary contact 102 may be the same.

[0063] In some embodiments, a gap exists between adjacent electrical contact layers in the moving contact 101 and the stationary contact 102. That is, a portion of adjacent electrical contact layers is connected together, while another portion has a gap. This gap reduces heat conduction between layers by the electric arc, improving contact life. Simultaneously, the presence of the gap allows the electrical contact layers to be relatively independent, enabling each layer to arc independently. In other words, the arc can ablate and extinguish on a single electrical contact layer without easily affecting other electrical contact layers simultaneously. This ensures that the remaining electrical contact layers can perform their anti-ablation function in a relatively isolated environment, improving the durability of the contact portion.

[0064] In some embodiments, each moving contact 101 includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the stationary contact 102 in the first set plane is smaller than the projected area of ​​the other electrical contact layers in the first set plane; each stationary contact 102 includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the moving contact 101 in the second set plane is smaller than the projected area of ​​the other electrical contact layers in the second set plane; wherein, the first set plane is perpendicular to the height direction of the moving contact 101; and the second set plane is perpendicular to the height direction of the stationary contact 102.

[0065] Taking each moving contact 101 as having at least two electrical contact layers as an example, since the projected area of ​​the electrical contact layer closest to the stationary contact 102 in the first set plane is smaller than that of other electrical contact layers in the first set plane, most of the arcing energy is locked in this smaller sacrificial area. This layer can be quickly consumed and quickly form a large contact gap difference between each parallel branch 100, ensuring that arcing occurs on the parallel branch 100 with the smaller contact gap and does not occur on the parallel branch 100 with the larger contact gap during the next disconnection. This ensures that alternating arcing can be reliably formed, thereby improving the lifespan of each contact group and also increasing the number of load switching cycles and electrical durability of the product. In addition, the other electrical contact layers with larger areas can play a good current-carrying role, thus realizing the spatial decoupling of the arcing function and the current-carrying function. This stepped structure with small-area arcing and large-area current carrying further extends the service life of the relay.

[0066] In other embodiments, each moving contact 101 includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the stationary contact 102 in the first defined plane is smaller than the projected area of ​​the other electrical contact layers in the first defined plane. In other embodiments, each stationary contact 102 includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the moving contact 101 in the second defined plane is smaller than the projected area of ​​the other electrical contact layers in the second defined plane.

[0067] In some embodiments, on each moving contact 101, among any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the stationary contact 102 in the first set plane is smaller than the projected area of ​​the electrical contact layer farther from the stationary contact 102 in the first set plane; on each stationary contact 102, among any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the moving contact 101 in the second set plane is smaller than the projected area of ​​the electrical contact layer farther from the moving contact 101 in the second set plane.

[0068] By making the area of ​​the electrical contact layer closer to the opposite contact smaller and the area of ​​the electrical contact layer farther away from the opposite contact larger, it is possible to ensure that the gap difference between each parallel branch 100 can be quickly established in the initial stage, thus providing conditions for alternating arcing. It also allows the number of interruptions that a single electrical contact layer can withstand to increase in the later stage, ensuring that the contact itself has a strong current carrying capacity and ablation resistance, and further extending the service life of the relay.

[0069] In some embodiments, on each moving contact 101, among any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the stationary contact 102 in the first defined plane is smaller than the projected area of ​​the electrical contact layer farther from the stationary contact 102 in the first defined plane. In other embodiments, on each stationary contact 102, among any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the moving contact 101 in the second defined plane is smaller than the projected area of ​​the electrical contact layer farther from the moving contact 101 in the second defined plane.

[0070] In some embodiments, each electrical contact layer in the moving contact 101 has a spherical crown surface protruding toward the stationary contact 102, and the centers of each electrical contact layer are coaxially arranged; each electrical contact layer in the stationary contact 102 has a spherical crown surface protruding toward the moving contact 101, and the centers of each electrical contact layer are coaxially arranged.

[0071] The spherical cap surface design, with its relatively raised moving and stationary contacts, ensures precise point-to-point contact during each closure. Since each layer of the spherical cap surface is coaxially aligned, the central position determines the contact gap, guaranteeing the reliability of the alternating arcing caused by the height difference. Simultaneously, the spherical cap surface allows the arc to concentrate and prevents it from slipping outwards, thus achieving rapid arc extinguishing and reducing wear. This design ensures reliable contact while maximizing the lifespan of the multi-layer structure, allowing the relay to operate longer and more stably.

[0072] In some embodiments, each electrical contact layer in the moving contact 101 has a spherical cap-shaped surface protruding toward the stationary contact 102, and the centers of each electrical contact layer are coaxially arranged. In other embodiments, each electrical contact layer in the stationary contact 102 has a spherical cap-shaped surface protruding toward the moving contact 101, and the centers of each electrical contact layer are coaxially arranged.

[0073] In some embodiments, each moving contact 101 and stationary contact 102 includes at least two electrical contact layers, and at least a portion of the middle of each electrical contact layer is a sheet-like structure with a spherical cap shape. Specifically, each moving contact 101 includes at least two first electrical contact layers 1111, and at least a portion of the middle of each first electrical contact layer 1111 is a sheet-like structure with a spherical cap shape; each stationary contact 102 includes at least two second electrical contact layers 2111, and at least a portion of the middle of each second electrical contact layer 2111 is a sheet-like structure with a spherical cap shape. When the moving and stationary contacts generate an arc separately, the spherical cap surface allows the arc to concentrate and burn rather than easily slide outwards, thereby achieving rapid arc extinguishing. Furthermore, even if the moving and stationary contacts are not perfectly aligned during assembly, the spherical structure can automatically compensate for errors, ensuring that the multi-layer structure can still reliably alternately burn arcs. This design not only makes the contact between the moving and stationary contacts more reliable, but also uses the geometry to accelerate heat dissipation and arc extinguishing, improving the durability of the relay.

[0074] In some embodiments, in the alternating group, on the same moving contact 101, each of the first electrical contact layers 1111 is fixed to each other to form a contact portion; the edge of the contact portion is stepped; specifically, each of the first electrical contact layers 1111 is connected as a whole, ensuring that the first electrical contact layers 1111 will not loosen under multiple violent impacts, thus guaranteeing the stability of current transmission. Because the sides are stepped, the boundary positions 11110 of each first electrical contact layer 1111 can be defined more reliably. See [reference needed]. Figure 8 As shown, the dividing position 11110 can be or approximately a stepped surface.

[0075] In some embodiments, in the alternating group, on the same stationary contact 102, each of the second electrical contact layers 2111 is fixed to each other to form a contact portion; the edge of the contact portion is stepped; specifically, each of the second electrical contact layers 2111 is connected as a whole, ensuring that the second electrical contact layers 2111 will not loosen under multiple violent impacts, thus ensuring the stability of current transmission. Since the side is stepped, the boundary position of each second electrical contact layer 2111 can be defined more reliably, and the boundary position can be or approximately the step surface position of the step.

[0076] In some embodiments, the projected areas of each first electrical contact layer 1111 in the moving contact 101 within the second designated plane are the same, and the projected areas of each second electrical contact layer 2111 in the stationary contact 102 within the second designated plane are the same; wherein, the first designated plane is perpendicular to the height direction of the moving contact 101; and the second designated plane is perpendicular to the height direction of the stationary contact 102. This ensures stable performance of the moving and stationary contacts and facilitates manufacturing. Since each layer has the same area, this means that each electrical contact layer can withstand essentially the same current and heat capacity. Simultaneously, the uniform dimensions simplify the processing and alignment of parts, reducing production costs.

[0077] In some embodiments, the projected areas of each first electrical contact layer 1111 in the moving contact 101 in the second defined plane are the same. In other embodiments, the projected areas of each second electrical contact layer 2111 in the stationary contact 102 in the second defined plane are the same.

[0078] In some embodiments, all parallel branches 100 form an alternating group, thereby maximizing load distribution. All electrical contact layers participate in alternating arcing, further extending the service life of the contact portions.

[0079] In other embodiments, there are two parallel branches 100, both of which form an alternating group. This allows for an extension of the contact portion's lifespan through alternating arc burning without making the overall structure of the contact portion too complex, thus balancing size and durability.

[0080] In some embodiments, in the alternating group, on the same moving contact 101 or the same stationary contact 102, each electrical contact layer is fixed to each other to form a contact portion; each contact portion is formed by upsetting or welding the electrical contact layers together, or by integral upsetting; when formed by integral upsetting, the edge of the contact portion is formed into a stepped shape.

[0081] In some embodiments, the electrical contact layers are formed by stacking and forging. Mechanical pressure forces the electrical contact layers to interlock tightly, resulting in a very robust structure that prevents the layers from peeling off even under high temperatures and severe vibrations, ensuring stable operation of the relay in harsh environments.

[0082] For example, see Figure 7 and Figure 8 As shown, each electrical contact layer can be integrally upset. Integral upset refers to upseting a single silver layer into a shape with stepped edges. Each stepped surface is used to form or substantially form the interface between each electrical contact layer; see also Figure 9 and Figure 10 As shown, each electrical contact layer can also be formed by one or more upsetting processes.

[0083] In other embodiments, see Figure 11 and Figure 12 As shown, each electrical contact layer can also be formed by welding, which can also provide connection strength. Even under high temperature and severe vibration, the layers will not peel off, ensuring that the relay can still work stably in harsh environments.

[0084] In some embodiments, the material of each electrical contact layer is silver or a silver-based alloy. The silver-based alloy can be, but is not limited to, silver tin oxide or silver nickel, and can also be other conductive pure metals, metal alloys, cermet materials or other novel materials.

[0085] In other embodiments, see Figure 13 As shown, the contact portion includes a swing member 30 and a stationary contact member. The swing member 30 includes at least two branches 31, each branch 31 being provided with a moving contact 101. The stationary contact member is provided with at least two stationary contacts 102, each stationary contact 102 corresponding to a moving contact 101. The swing member 30 is capable of swinging so that the moving contact 101 contacts or separates from the corresponding stationary contact 102. The parallel branch 100 is composed of a branch 31, a moving contact 101 provided on the branch 31, and a stationary contact 102 corresponding to the moving contact 101.

[0086] This invention also provides a relay, including the contact portion provided in any of the above embodiments.

[0087] The relay provided in this embodiment of the invention, by using the contact portion provided in any of the above embodiments, allows the current to switch no longer limited to a single contact point during contact operation. Instead, it can achieve a distribution of contact positions in the height direction through the electrical contact layers of different heights within the same parallel branch 100 and the cooperation between different parallel branches 100. This enables the alternating arcing function without the need to use high-temperature resistant and arc-resistant materials to make the arc-burning contact group, preventing one group of contacts from failing prematurely due to being constantly in an arc-burning state, ensuring the reliability of the contact portion, and thus improving the service life of the relay.

[0088] Finally, it should be noted that the various embodiments / implementations provided by this invention can be combined with each other without creating contradictions, and will not be described in detail here.

[0089] In the embodiments of the invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the invention according to the specific circumstances.

[0090] In the description of the embodiments of the invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the invention.

[0091] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0092] The above are merely preferred embodiments of the invention and are not intended to limit the scope of the invention. Those skilled in the art will recognize that various modifications and variations can be made to the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A contact portion, characterized in that, The contact portion has at least two parallel branches arranged in parallel in the same current path, each parallel branch having a contact group, each contact group including a moving contact and a stationary contact; at least two of the parallel branches constitute an alternating group; in the alternating group, the moving contact and / or stationary contact of each contact group includes at least two electrical contact layers, each electrical contact layer being arranged along the height direction of the corresponding moving contact or stationary contact.

2. The contact portion according to claim 1, characterized in that, In the alternation group, each of the moving contacts on the parallel branch has at least one electrical contact layer whose position along the height direction of the moving contact is different from the position of any electrical contact layer in the moving contacts of the other parallel branches; and / or, in the alternation group, each of the stationary contacts on the parallel branch has at least one electrical contact layer whose position along the height direction of the stationary contact is different from the position of any electrical contact layer in the stationary contacts of the other parallel branches.

3. The contact portion according to claim 2, characterized in that, In the alternating group, the initial contact gaps of the contact groups corresponding to at least two of the parallel branches are not equal; When the moving contact disconnects from the stationary contact, in each of the parallel branches of the alternating group, the moving contact with the smaller initial contact gap disconnects from the stationary contact and ignites an arc to consume at least a portion of the electrical contact layer that is close to each other.

4. The contact portion according to claim 2, characterized in that, In the alternating group, the initial contact gaps of the contact groups corresponding to at least two of the parallel branches are equal, and are 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 the Nth electrical contact layer of the moving contact and / or the Nth electrical contact layer of the stationary contact are burned.

5. The contact portion according to claim 1, characterized in that, In the alternating groups, the number of electrical contact layers in the moving contacts of the different parallel branches is the same, and / or the number of electrical contact layers in the stationary contacts of the different parallel branches is the same.

6. The contact portion according to claim 1, characterized in that, In the alternation group, the moving contacts in the different parallel branches are constructed in the same way, and / or, in the alternation group, the stationary contacts in the different parallel branches are constructed in the same way.

7. The contact portion according to claim 1, characterized in that, In the alternating group, when the same parallel branch has at least two of the contact groups, the number of electrical contact layers in each of the moving contacts is the same, and / or the number of electrical contact layers in each of the stationary contacts is the same.

8. The contact portion according to claim 1, characterized in that, There is a gap between adjacent electrical contact layers in the moving contact and the stationary contact.

9. The contact portion according to claim 1, characterized in that, Each of the moving contacts includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the stationary contact in the first set plane is smaller than the projected area of ​​the other electrical contact layers in the first set plane; and / or, each of the stationary contacts includes at least two electrical contact layers, and the projected area of ​​the electrical contact layer closest to the moving contact in the second set plane is smaller than the projected area of ​​the other electrical contact layers in the second set plane; wherein, the first set plane is perpendicular to the height direction of the moving contact; and the second set plane is perpendicular to the height direction of the stationary contact.

10. The contact portion according to claim 9, characterized in that, On each of the moving contacts, in any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the stationary contact in the first set plane is smaller than the projected area of ​​the electrical contact layer farther from the stationary contact in the first set plane; and / or, on each of the stationary contacts, in any two adjacent electrical contact layers, the projected area of ​​the electrical contact layer closer to the moving contact in the second set plane is smaller than the projected area of ​​the electrical contact layer farther from the moving contact in the second set plane.

11. The contact portion according to claim 1, characterized in that, The projected areas of each electrical contact layer in the moving contact are the same in the first set plane, and / or the projected areas of each electrical contact layer in the stationary contact are the same in the second set plane; wherein the first set plane is perpendicular to the height direction of the moving contact; and the second set plane is perpendicular to the height direction of the stationary contact.

12. The contact portion according to claim 1, characterized in that, Each of the electrical contact layers in the moving contact has a spherical cap surface protruding toward the stationary contact, and the centers of each electrical contact layer are coaxially arranged; and / or, each of the electrical contact layers in the stationary contact has a spherical cap surface protruding toward the moving contact, and the centers of each electrical contact layer are coaxially arranged.

13. The contact portion according to claim 12, characterized in that, Each of the moving contacts and the stationary contacts includes at least two electrical contact layers, and at least a portion of the middle part of each electrical contact layer is a sheet-like structure with a spherical cap-shaped surface.

14. The contact portion according to claim 1, characterized in that, In the alternating group, on the same moving contact or the same stationary contact, each of the electrical contact layers is fixed to each other to form a contact portion; the edge of the contact portion is stepped.

15. The contact portion according to claim 1, characterized in that, All of the parallel branches form an alternating group; and / or, the number of the parallel branches is two, and both form an alternating group.

16. The contact portion according to claim 1, characterized in that, In the alternating group, on the same moving contact or the same stationary contact, each of the electrical contact layers is fixed to each other to form a contact portion; each of the contact portions is formed by upsetting or welding the superimposed electrical contact layers, or by integral upsetting; when formed by integral upsetting, the edge of the contact portion is formed into a stepped shape.

17. The contact portion according to any one of claims 1 to 16, characterized in that, The material of each of the electrical contact layers is a conductive pure metal, metal alloy, or metal ceramic material.

18. The contact portion according to any one of claims 1 to 16, characterized in that, It includes at least two moving contacts, a first stationary contact and a second stationary contact. The moving contacts have an extending direction, and the moving contact points are provided at both ends of the extending direction of the moving contact. The extending directions of all the moving contacts are the same, and the thickness directions of all the moving contacts are the same. The first stationary contact has at least two first stationary contacts, and the number of the first stationary contacts on the first stationary contact is the same as the number of the moving contacts at one end of each of the moving contacts, and they correspond one-to-one. The second stationary contact has at least two second stationary contacts, and the number of the second stationary contacts on the second stationary contact is the same as the number of the moving contacts at the other end of each of the moving contacts, and they correspond one-to-one. The parallel branch consists of a moving contact, moving contacts at both ends of the moving contact in the extension direction, and first and second stationary contacts corresponding to the two moving contacts respectively.

19. The contact portion according to any one of claims 1 to 16, characterized in that, The device includes a swinging component and a stationary contact component. The swinging component includes at least two branches, each of which is provided with a moving contact. The stationary contact component is provided with at least two stationary contacts, each of which corresponds to a moving contact. The swinging component is capable of swinging to make the moving contact contact or separate from the corresponding stationary contact. The parallel branch consists of one branch, a moving contact provided in the branch, and a stationary contact corresponding to the moving contact.

20. A relay, characterized in that, Includes the contact portion as described in any one of claims 1 to 19.

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