AU2016336689B2

AU2016336689B2 - Contact system and contactor comprising contact system

Info

Publication number: AU2016336689B2
Application number: AU2016336689A
Authority: AU
Inventors: Lingqian MENG; Yin NAN; Congli WANG; Mingliang Zhang
Original assignee: Sooar Beijing Investment Management Group Co Ltd
Current assignee: SOOAR (BEIJING) INVESTMENT MANAGEMENT GROUP CO Ltd
Priority date: 2015-10-10
Filing date: 2016-10-10
Publication date: 2018-12-06
Anticipated expiration: 2036-10-10
Also published as: CN105206476A; WO2017059821A1; BR112018006036A2; ZA201801873B; AU2016336689A1

Abstract

A contact system and a contactor comprising the contact system. The contact system comprises: a contact support member (100), the upper end of which is provided with a positioning device (110) capable of moving up and down in the contact support member (100), wherein the positioning device (110) has at least two arms (111); at least two first movable contacts (120), the at least two first movable contacts (120) respectively having at least two contact points (122, 123) and respectively being mounted on the at least two arms (111) of the positioning device (110); and a stationary contact (180), the stationary contact (180) having contact points corresponding to the contact points (122, 123) of the at least two first movable contacts (120), wherein one first movable contact (120) is mounted on each arm (111) of the positioning device (110). Compared with the traditional contact system and contactor, the contact system and contactor have a smaller volume, and can save the space in a control cabinet.

Description

CONTACT SYSTEM AND

CONTACTOR COMPRISING CONTACT SYSTEM

FIELD OF THE INVENTION

The invention relates to a field of low-voltage electrical apparatus, and particularly, to a contact system and a contactor comprising the contact system.

BACKGROUND

Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

A contactor is an appliance to control a load by making contacts to close with a magnetic field produced by a current flowing through coils. Specifically, the contactor mainly includes three parts of an electromagnetic system, a contact system and an arc-extinguishing system. The electromagnetic system includes a movable core, a fixed core and electromagnetic coils, wherein the electromagnetic coils and the fixed core are stationaiy under working conditions, and the movable core is movable. When the electromagnetic coils are charged, an electromagnetic force produced by the fixed core attracts the movable core; as the contact system is in linkage with the movable core, the movable core brings a movable contact in the contact system to move and thus connect with a fixed contact in the contact system, so that a power supply is switched on. When the electromagnetic coils are discharged, the electromagnetic force produced by the fixed core disappears, and the movable core disconnects with the fixed core and brings the movable contact to disconnect with the fixed contact in the contact system, so that the power supply is switched off. The arc-extinguishing system mainly includes an arc-extinguishing device for extinguishing electric arcs produced when the movable contact and the fixed contact in the contact system connect or disconnect with each other.

Currently, the contact system of most low-current (<100A) contactors is provided as follows: a contact support component is operable to move up and down and a hole is provided on the contact support component; the movable contact is provided within the hole provided on the contact support component and an elastic element is provided on the movable contact; when the contactor closes, the movable contact moves up and down along with the contact support component until the movable contact connects with the fixed contact; the contact support component continues to move and thus an over travel is produced. When the contactor opens, a converse process is implemented.

Currently, the contact system of most high-current (>100A) contactors is provided as follows: the movable contact is provided on the contact support component; the movable contact is usually a bridge-shaped movable contact, and silver alloy contacts are symmetrically welded at frond and back positions of the movable contact; an unenclosed gap is provided on each of left and right edges at a middle part of the movable contact, and a spring support component clamps the unenclosed gap and guides the bridge-shaped movable contact via the unenclosed gap (for example, LC1-F500 AC contactor produced by Schneider Inc., CJ20-250 AC contactor produced domestically and so on); or two enclosed gaps (for example, Π -shaped gaps) are symmetrically provided on the left and right edges at the middle part of the movable contact and the spring support component guides the bridge-shaped movable contact via the two enclosed gaps (for example, 3TF-52 AC contactor produced by SIMENS, SC-N10 AC contactor produced by Fuji company and so on).

In the high-current contactors, as the area of the contact is too large, the contact is unavoidable to be deformed when it is made, leading to roughness of the surface of the contact. In contactors in which a contact system having a single movable contact is employed, when the moveable contact and the fixed contact connect with each other, a substantial contact area between the movable and fixed contacts is small, so a contact resistance between the movable and fixed contacts is large and the temperature increase of the contact system is high, which will accelerate aging of plastic elements and reduce mechanical strength of some metal elements even burn down the contactor.

Therefore, a contactor, in which a contact system including a plurality of movable contacts (the contact system includes at least two movable contacts) is employed, is provided. The contact system including a plurality of movable contacts may be the following two structures: 1) A simple copy of the contact system including a single movable contact (for example, LC1-F1700 AC contactor produced by Schneider Inc.), wherein: at least two contact components are included; each contact component includes a spring support component, a contact support component, a bridge-shaped movable contact and a shaft (or no shaft); the at least two contact components move at the same time. 2) An improved copy of the contact system including a single movable contact (for example, AF1650 AC contactor produced by ABB), wherein: at least two bridge-shaped contact components are included; each

2016336689 23 Nov 2018 bridge-shaped contact component includes a spring support component, a bridge-shaped movable contact and a shaft (or no shaft); all bridge-shaped contact components are placed on the contact support component together.

In the above described contactor in which the contact system including a plurality of movable contacts is employed, as respective movable contacts are arranged in parallel and it is necessary to avoid collision among the movable contacts in the contact system, the contactor has a large volume, leading to waste of space. Moreover, although the above contactor in which the contact system including a plurality of movable contacts is employed is especially suitable for high-current scenarios and the temperature increase of the contactor may be improved, the physical dimension of the contactor is too large, leading to waste of space in a control cabinet. Meanwhile, whenever the contactor in which the contact system including a plurality of movable contacts opens or closes, all movable contacts connect and disconnect with the fixed contact at the same time, so all the movable contacts will be burned by the electric arc, and the contactor will be easily burned out and has a relatively short electrical life.

SUMMARY OF THE INVENTION

Unless the context clearly requires otherwise, throughout the description and the claims, the words ‘comprise’, ‘comprising’ and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say in the sense of “including but not limited to”.

In view of one or more of the above problems, a contact system and a contactor including the contact system are provided.

A contact system in accordance with embodiments of the invention comprises: a contact support component, on the upper end of which a locating device capable of moving up and down within the contact support component is provided, the locating device having at least two anus; at least two first movable contacts, which are mounted respectively on the at least two arms of the locating device, each of the at least two first movable contacts having at least two contacts; and a fixed contact, which has contacts corresponding to the contacts of the at least two first movable contacts, wherein one of the at least two first movable contacts is mounted on each arm of the locating device.

In a particular aspect, the present invention provides a contact system, comprising: a contact support component, on the upper end of which a locating device capable of moving up and down within the contact support component is provided, the locating device having at (followed by page 3 a)

2016336689 23 Nov 2018 least two arms; at least two first movable contacts, which are mounted respectively on the at least two arms of the locating device, each of the at least two first movable contacts having at least two contacts, wherein one of the at least two first movable contacts is mounted on each arm of the locating device; and at least one second movable contact, which is mounted between the at least two arms of the locating device in parallel with the at least two first movable contacts, each of the at least one second movable contact having at least two contacts, a fixed contact, which has contacts corresponding to the contacts of the at least two first movable contacts and the at least one second movable contacts, wherein at least one of all movable contacts including both the at least two first movable contacts and the at least one second movable contact does not connect or disconnect with the fixed contact at the same time with the other movable contacts.

The contact system in accordance with embodiments of the invention further comprises: at least one second movable contact, which is mounted between the at least two arms of the locating device in parallel with the at least two first movable contacts, each of the at least one movable contact having at least two contacts, wherein the fixed contact further has contacts corresponding to the contacts of the at [FOLLOWED BY PAGE 4]

3a least one second movable contact.

In the contact system in accordance with embodiments of the invention, at least one of all movable contacts including both the at least two first movable contacts and the at least one second movable contact does not connect or disconnect with the fixed contact at the same time with the other movable contacts, and the contacts of the at least one movable contact and the contacts corresponding to the contacts of the at least one movable contact on the fixed contact are made of materials having larger resistivity and arc resistance than the contacts of the other movable contacts and the contacts corresponding to the contacts of the other movable contacts on the fixed contact.

In the contact system in accordance with embodiments of the invention, a first elastic element is provided above each first movable contact, and a second elastic element is provided above each second movable contact. Furthermore, a first arc angle is provided between each first movable contact and the first elastic element above the first movable contact, and a second arc angle is provided between each second movable contact and the second elastic element above the second movable contact.

In the contact system in accordance with embodiments of the invention, the locating device is a U-shaped, H-shaped, E-shaped, or reverse E-shaped structure, and a rectangular, circular, elliptic, L-shaped, T-shaped, Y-shaped, triangular, polygonal, or special-shaped locating structure is provided at a middle part of the first movable contact, the first elastic element, and the first arc angle.

A contactor in accordance with embodiments of the invention comprises an electromagnetic system, an arc-extinguishing system and the above described contact system.

As compared with traditional contact systems and contactors, in the contact system and the contactor in accordance with embodiments of the invention, as the contact system includes at least two movable contacts to be fixed and guided by the at least two arms of the locating device, space occupied by the contact system and the contactor is reduced. Therefore, a product including the contact system or the contactor has a significantly smaller volume than existing products having a same current level in the market.

Furthermore, as compared with contact systems including a single movable contact, the contact system including a plurality of movable contacts in accordance with embodiments of the invention has a significantly smaller contact resistance, so its temperature increase is reduced. Moreover, as the plurality of movable contacts included in the contact system do not connect and/or disconnect with the fixed contact at the same time, burning losses of the movable contacts by the electric arc produced when the contact system closes or opens are reduced, so that the electrical life of the contact system is improved.

DESCRIPTION OF THE DRAWINGS

The following accompany drawings are part of the application and are intended to understand the application. Implementations shown in the accompany drawings and described in the description are intended to interpret principles of the invention, wherein:

Fig. 1 is a diagram of a locating device in a contact system in accordance with embodiments of the invention;

Fig. 2 is a diagram of a contact support component in the contact system in accordance with embodiments of the invention;

Fig. 3 is an assembly diagram of the contact support component and the locating device in the contact system in accordance with embodiments of the invention;

Fig. 4 is an explosion diagram of the contact system in accordance with a first embodiment of the invention;

Fig. 5 is an explosion diagram of a movable contact, an arc angle, and an elastic element in accordance with the first embodiment of the invention;

Fig. 6 is an assembly diagram of the contact system in accordance with the first embodiment of the invention;

Fig. 7 is an assembly sectional view of the contact system in accordance with the first embodiment of the invention;

Fig. 8 is a diagram of a contactor in which the contact system in accordance with the first embodiment of the invention is employed;

Fig. 9 is an assembly diagram of the contact system in accordance with a second embodiment of the invention.

DETAILED DESCRIPTION

Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, a lot of specific details are provided so as to provide thorough understanding of the invention. However, those skilled in the art should appreciate that the invention may be practiced without some of the specific details. The following description of embodiments is merely intended to provide better understanding of the invention by illustrating examples of the invention. The invention is not limited to any specific configuration and algorithm proposed below and covers any modification, alternative, and improvement to elements, components, and algorithms without departing from the spirit of the invention. In the following description and the accompany drawings, well known structures and techniques are not illustrated so as to avoid unnecessarily obscuring the invention.

A contact system and a contactor including the contact system in accordance with embodiments of the invention are described below in conjunction with the accompany drawings.

Fig. 1 is a diagram of a locating device in the contact system in accordance with embodiments of the invention. Fig. 2 is a diagram of a contact support component in the contact system in accordance with embodiments of the invention. Fig. 3 is an assembly diagram of the contact support component and the locating device in the contact system in accordance with embodiments of the invention. Referring to Figs. 1-3, the locating device, the contact support component and the assembly relation between them in accordance with embodiments of the invention are described in detail below.

Specifically, as shown in Fig. 1, in accordance with embodiments of the invention, the locating device 110 is a U-shaped structure having two arms 111 and a shaft 112 spanning across the two arms 111. As shown in Fig. 2, in accordance with embodiments of the invention, an upper surface of the contact support component 100 is provided with two steps 104 and 105, and the upper surface of the contact support component 100 is divided into three planes 101, 102 and 103 by the steps 104 and 105, wherein the plane 102 is lower than the planes 101 and 103 by 1mm (it should be noted that the contact support component 100 may move up and down in the contactor). As shown in Fig. 3, when the contact support component 100 and the locating device 110 are assembled together, the two arms 111 of the locating device 110 pass through rectangular holes on the planes 101 and 103 of the contact support component 100 respectively and the locating device 110 may move up and down relative to the contact support component 100.

Fig. 4 is an explosion diagram of the contact system in accordance with a first embodiment of the invention. Fig. 5 is an explosion diagram of a movable contact, an arc angle, and an elastic element in accordance with the first embodiment of the invention. Fig. 6 is an assembly diagram of the contact system in accordance with the first embodiment of the invention. Fig. 7 is an assembly sectional view of the contact system in accordance with the first embodiment of the invention. Referring to Figs.

4-7, the contact system in accordance with the first embodiment of the invention is described in detail below.

As shown in Figs. 4-6, movable contacts 120 are provided on the two arms 111 of the locating device 110 via rectangular locating holes at middle parts of the movable contacts 120, and are supported on the planes 101 and 103 of the contact support component 100; arc angles 140 and elastic elements 130 are provided on the two arms 111 of the locating device 110 in turn via rectangular locating holes at middle parts of the arc angles 140 and the elastic elements 130, and are supported on the planes 101 and 103 of the contact support component 100 in matching with the movable contacts 120, wherein the arc angle 140 is placed above the movable contact 120 and the elastic element 130 is placed above the arc angle 140; the shaft 112 spanning across the two arms 111 of the locating device 110 is placed above the elastic elements 130 so as to limit positions of the movable contacts 120, the arc angels 140 and the elastic elements 130, so that they cannot slip from upper ends of the two arms 111 of the locating device 110; meanwhile, a movable contact 160, an arc angle 170 and an elastic element 150 are supported on the plane 102 of the contact support component 100, and the shaft 112 of the locating device 110 is placed above the elastic element 150 so as to limit the positions of the movable contact 160, the arc angel 170 and the elastic element 150. As the movable contact 160, the arc angle 170 and the elastic element 150 are not provided on the two arms 111 of the locating device 110, there is no rectangular locating hole at their middle parts.

As shown in Fig. 5, the movable contact 120 is a bridge-shaped movable contact, wherein: contacts 122 and 123 are symmetrically provided at front and back positions of the movable contact 120 (i.e., the contacts 122 and 123 are provided at two symmetric pillar positions of the movable contact 120); there is a locating structure 121, which is a rectangular hole, at the middle part of the movable contact 120; and one arm 111 of the locating device 110 passes through the rectangular hole at the middle part of the movable contact 120 to fix and guide the movable contact 120. It should be appreciated that the movable contact 160 has a similar structure as the movable contact 120 except that there is no locating structure at the middle part of the movable contact 160.

As shown in Fig. 6, in accordance with the first embodiment of the invention, the contact system includes a movable contact subsystem and a single fixed contact 180. Specifically, the movable contact subsystem includes the contact support component

100, the locating device 110, the two movable contacts 120 and the arc angles 140 and the elastic elements 130 above the movable contacts 120 provided respectively on the two arms 111 of the locating device 110, and the movable contact 160 and the arc angle 170 and the elastic element 150 above the movable contact 160 provided between the two arms 111 of the locating device 110 in parallel with the movable contacts 120 and the arc angles 140 and the elastic elements 130 above the movable contacts 120.

As can be seen in conjunction with Figs. 2, 4, 6 and 7, the planes 101 and 103 of the contact support component 100 support the movable contacts 120, the arc angles 140 and the elastic elements 130; the plane 102 of the contact support component 100 supports the movable contact 160, the arc angle 170 and the elastic element 150; there are rectangular holes at the middle parts of the movable contact 120, the elastic element 130 and the arc angle 140, and the two arms 111 of the locating device 110 pass through the rectangular holes; the shaft 112 spanning across the two arms 111 of the locating device 110 is placed above the elastic elements 130 and the elastic elements 150; the three movable contacts supported respectively by the three planes

101, 102 and 103 of the contact support component 100 are guided and fixed by the two arms 111 of the locating device 110 and the steps 104 and 105 of the contact support component 100; as the plane 102 of the contact support component 100 is lower than the planes 101 and 103 of the contact support component 100 by 1mm, the movable contact 160 on the plane 102 of the contact support component 100 is lower than the movable contacts 120 on the planes 101 and 103 of the contact support component 100 by 1mm.

As can be seen from Figs. 6 and 7, in accordance with the first embodiment of the invention, the fixed contact 180 in the contact system has six contacts in total respectively corresponding to the two contacts of the movable contact 120 and the two contacts of the movable contact 160, wherein the six contacts are on a same plane and have a same height. As the movable contact 160 on the plane 102 of the contact support component 100 is lower than the movable contacts 120 on the planes 101 and 103 of the contact support component 100 by 1mm and all contacts of the fixed contact 180 have the same height, the movable contact 160 on the plane 102 of the contact support component 100 has an opening distance, which is less than opening distances of the movable contacts 120 on the planes 101 and 103 of the contact support component 100 by 1mm, and thus is an arc contact. The contacts of the movable contact 160 and the contacts corresponding to the contacts of the movable contact 160 on the fixed contact are made of materials having larger resistivities and arc resistances than the contacts of the movable contacts 120 and/or the contacts corresponding to the contacts of the movable contacts 120 on the fixed contact. For example, the contacts of the movable contact 160 are made of silver-tungsten alloy, the contacts corresponding to the contacts of the movable contact 160 on the fixed contact are made of silver-tungsten carbide alloy, and the other contacts are all made of silver-tin oxide alloy or silver-cadmium oxide alloy. Of course, those skilled in the art should appreciate that the contacts of the movable contacts 120 and 160 may also be made of a same material, and the contacts corresponding to the contacts of the movable contacts 120 and 160 on the fixed contact may also be made of a same material.

Specifically, the contact system shown in Figs. 6 and 7 closes by the following process: when the contact support component 100 brings the movable contact 160 and the two movable contacts 120 to move down, the movable contact 160 having the smaller opening distance (i.e., the arc contact) connects with the fixed contact 180 earlier than the two movable contacts 120; when the two movable contacts 120 do not connect with the fixed contact 180 and the movable contact 160 (i.e., the arc contact) connects with the fixed contact 180, all currents are concentrated on the movable contact 160 (i.e., the arc contact); when the contact support component 100 continues to move down a certain distance after the movable contact 160 connects with the fixed contact 180, the movable contact 160 and the two movable contacts 120 all connect with the fixed contact 180, and the currents are distributed to respective movable contacts and a circuit is established; at this point, both contact resistances between the movable contacts 120 and the fixed contact 180 and a contact resistance between the movable contact 160 and the fixed contact 180 are reduced, so temperature increase of the contact system is reduced. It should be noted that as resistivities of the contacts of the movable contact 160 and the contacts corresponding to the contacts of the movable contact 160 on the fixed contact are larger than those of the contacts of the movable contacts 120 and the contacts corresponding to the contacts of the movable contacts 120 on the fixed contact, the currents distributed to respective movable contacts are not equal to each other, wherein the current on the movable contact 160 is substantially smaller than those on the other two movable contacts 120, and the contactor conducts electricity mainly by the two movable contacts 120.

Furthermore, the contact system shown in Figs. 6 and 7 opens by the following process: when the contact support component 100 brings the movable contact 160 and the two movable contacts 120 to move up, the movable contact 160 having the smaller opening distance (i.e., the arc contact) disconnects with the fixed contact 180 later than the two movable contacts 120; when the movable contacts 120 disconnect with the fixed contact 180 and the movable contact 160 (i.e., the arc contact) does not disconnect with the fixed contact 180, all currents are concentrated on the movable contact 160 (i.e., the arc contact); as no current is cut off when the two movable contacts 120 disconnect with the fixed contact 180, no electric arc is produced; when the contact support component 100 continues to move up and the movable contact 160 disconnects with the fixed contact 180, the currents concentrated on the movable contact 160 are cut off, so an electric arc is produced; after the electric arc is extinguished by the arc-extinguishing system, the circuit is totally disconnected. At this point, the electric arc produced when the movable contact 160 disconnects with the fixed contact 180 burns the movable contact 160 (i.e., the arc contact) while the other two movable contacts 120 are substantially protected from burning, so the electrical life of the contact system is improved. Moreover, as the contacts of the movable contact 160 and the contacts corresponding to the contacts of the movable contact 160 on the fixed contact are made of materials having larger resistivities and arc resistances (for example, they are made of silver-tungsten alloy and silvertungsten carbide alloy, respectively), their arc resistances are larger, so the electrical life of the movable contact 160 (i.e., the arc contact) may be improved.

Fig. 8 is a diagram of a contactor in which the contact system in accordance with the first embodiment of the invention is employed. As shown in Fig. 8, the contactor, in which the contact system in accordance with the first embodiment of the invention is employed, has a small volume and a large capacitance.

Specifically, when control coils of the contactor are charged, according to Maxwell’s electromagnetic principles, an electromagnetic force is produced between a io movable core and a fixed core and the movable core moves down while overcoming a counter force from a counterforce spring and thus brings the contact support component 100 to move down; the contact support component 100 brings the movable contacts 120 and 160 to move down, and the movable contact 160 (i.e., the arc contact) connects with the fixed contact 180 firstly; after the contact support component 100 continues to move down 1mm, the contact resistance between the movable contact 160 and the fixed contact 180 and the contact resistances between the movable contacts 120 and the fixed contact 180 are reduced; the contact support component 100 continues to move down a certain distance until the movable core completely connects with the fixed core. The contactor switches on a circuit with the above process, so that an electric appliance (for example, an electric motor) is switched on.

Specifically, when the control coils of the contactor are discharged, according to Maxwell’s electromagnetic principles, the electromagnetic force between the movable core and the fixed core disappears and the movable core pushes the contact support component 100 to move up under the function of the counterforce spring; the two movable contacts 120 disconnect with the fixed contact 180 firstly; at this point, the movable contact 160 having the smaller opening distance (i.e., the arc contact) still connects with the fixed contact 180; after the contact support component 100 continues to move up 1mm, the movable contact 160 having the smaller opening distance (i.e., the arc contact) disconnects with the fixed contact, and the electric arc is produced; the electric arc is introduced into the arc-extinguishing system for extinguishing by the movable contact 160 having the smaller opening distance (i.e., the arc contact) and the fixed contact 180; the contact support component 100 continues to move up a certain distance (i.e., the opening distance of the movable contact 160) until the movable core completely disconnects with the fixed core. After the movable contacts disconnect with the fixed contact, the contact system is at a disconnecting position shown in Fig. 6. In the above process, the two movable contacts 120 disconnect with the fixed contact 180 firstly, the movable contact 160 having the smaller opening distance still connects with the fixed contact 180, and the currents flow through the movable contact 160, so no electric arc is produced when the two movable contacts 120 disconnect with the fixed contact 180; the contact support component 100 continues to move up, and the electric arc is produced when the movable contact 160 disconnects with the fixed contact 180; the movable contact

160 is the arc contact and the two movable contacts 120 are not burned, so that the electric life of the contact system is improved. The contactor switches off the circuit with the above process, so that the electric appliance (for example, the electric motor) is switched off.

It should be noted that the locating device 110 may have two arms with a U-shaped or H-shaped structure, or have three arms with a E-shaped or reverse E-shaped structure. In addition, the rectangular holes at the middle parts of the movable contact 120, the arc angle 140 and the elastic element 130 may be replaced with a circular, elliptic, L-shaped, T-shaped, Y-shaped, triangular, polygonal, or another specially shaped locating structure as long as the movable contact 120, the arc angle 140 and the elastic element 130 may be movably mounted on the arm of the locating device 110.

Fig. 9 is an assembly diagram of the contact system in accordance with a second embodiment of the invention. As shown in Fig. 9, the contact system includes a single fixed contact 180 and five movable contacts including two most outboard movable contacts 120, two outboard movable contacts 160 and a middle movable contact 200. Arc angles and elastic elements without any locating structure at the middle parts thereof are provided on the middle movable contact 200 and the two outboard movable contacts 160. The two most outboard movable contacts 120 and the arc angles and the elastic elements above the two most outboard movable contacts 120 are provided on the two arms 111 of the locating device 110 via the locating structures at the middle parts thereof. The contacts of the five movable contacts 120, 200 and 160 have the same height, and the contacts of the middle movable contact 200 is farther to the middle part thereof than the contacts of the movable contacts 120 and 160. There are contacts corresponding to the contacts of the five movable contacts provided on the fixed contact 180, and the contacts corresponding to the middle movable contact 200 on the fixed contact 180 are higher than the other contacts on the fixed contact 180 by 1.5mm. At this point, the opening distance of the middle movable contact 200 is smaller than the opening distances of the two most outboard movable contacts 120 and the two outboard movable contacts 160 by 1.5mm, and the middle movable contact 200 is the arc contact. Here, the movable contacts 120 and 160 correspond to the movable contacts 120 and 160 described in conjunction with Figs. 4-7, and the movable contact 200 has a similar structure as the movable contact 160 except that the movable contact 200 is longer than the movable contact 160.

Working principles of the contact system shown in Fig. 9 are similar to those of the contact system in accordance with the first embodiment of the invention and thus are not redundantly described.

The above described embodiments are not intended to limit protection scopes claimed by the invention in any form, and claims of the invention cover all modification and alterations. Therefore, various modifications and alternations made to the above described embodiments all fall within the protection scopes of the invention.

Claims

What is claimed is:

1. A contact system, comprising:

a contact support component, on the upper end of which a locating device capable of moving up and down within the contact support component is provided, the locating device having at least two arms;

at least two first movable contacts, which are mounted respectively on the at least two arms of the locating device, each of the at least two first movable contacts having at least two contacts, wherein one of the at least two first movable contacts is mounted on each arm of the locating device; and at least one second movable contact, which is mounted between the at least two arms of the locating device in parallel with the at least two first movable contacts, each of the at least one second movable contact having at least two contacts, a fixed contact, which has contacts corresponding to the contacts of the at least two first movable contacts and the at least one second movable contacts, wherein at least one of all movable contacts including both the at least two first movable contacts and the at least one second movable contact does not connect or disconnect with the fixed contact at the same time with the other movable contacts.
2. The contact system of claim 1, wherein the contacts of the at least one movable contact and the contacts corresponding to the contacts of the at least one movable contact on the fixed contact are made of materials having larger resistivity and arc resistance than the contacts of the other movable contacts and the contacts corresponding to the contacts of the other movable contacts on the fixed contact.
3. The contact system of claim 1, wherein a first elastic element is provided above each first movable contact.
4. The contact system of claim 1, wherein a second elastic element is provided above each second movable contact.
5. The contact system of claim 3, wherein a first arc angle is provided between each first movable contact and the first elastic element above the first movable contact.

2016336689 23 Nov 2018
6. The contact system of claim 4, wherein a second arc angle is provided between each second movable contact and the second elastic element above the second movable contact.
7. The contact system of claim 1, wherein the locating device is a U-shaped, H-shaped, E-shaped, or reverse E-shaped structure.
8. The contact system of claim 5, wherein a rectangular, circular, elliptic, L-shaped, T-shaped, Y-shaped, triangular, polygonal, or special-shaped locating structure is provided at a middle part of the first movable contact, the first elastic element, and the first arc angle.
9. A contactor comprising an electromagnetic system, an arc-extinguishing system and the contact system of any one of claims 1-8.