CN214152745U

CN214152745U - Novel arc extinguishing contact system of direct current high voltage contactor

Info

Publication number: CN214152745U
Application number: CN202120361655.7U
Authority: CN
Inventors: 黄佳颜; 王建卫; 廖大麟
Original assignee: Guizhou University of Engineering Science
Current assignee: Guizhou University of Engineering Science
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-09-07
Anticipated expiration: 2031-02-09

Abstract

The utility model discloses a novel arc extinguishing contact system of a direct current high voltage contactor, which comprises an electromagnetic component (1), an auxiliary contact component A (2), a main contact component (3) and an auxiliary contact component B (4), and is characterized in that; main contact subassembly (3) are installed to electromagnetic component (1) upper end, and mid-mounting has support (5), and auxiliary contact subassembly A (2), auxiliary contact subassembly B (4) are installed respectively at both ends about support (5). The utility model discloses a double break point contact uses with the cooperation of single break point contact, ensures the reliable switch-on of contactor and breaks off direct current high voltage heavy current load, improves the contact system life-span, reduces the production and processing technology simultaneously, makes it can be in wide field application and popularization.

Description

Novel arc extinguishing contact system of direct current high voltage contactor

Technical Field

The utility model relates to a contactor technical field, especially a novel direct current high voltage contactor arc extinguishing contact system.

Background

When an electromagnet coil is electrified, electromagnetic attraction is generated to enable an iron core to move so as to drive a movable part connected with the iron core to move, and moving and static contacts of the contact system are switched from off to on so as to switch on a load; when the coil loses power and the electromagnetic attraction disappears, the return spring force enables the iron core to return to move, so that the moving and static contacts of the contact system return to an open state from a closed state, and the load is disconnected. Because the load of the direct-current high-voltage contactor for connection and disconnection is direct-current high-voltage large current, for example, 270V DC is disconnected by a contactor on a new generation aviation aerospace, 450V DC is used on a new energy automobile, and even a load up to 1000V DC is required on a high-speed rail, under the high voltage, a host machine often requires the weight and the volume of the contactor to be equivalent to those of a low-voltage (27V DC) contactor for disconnection of the same current. Therefore, the direct-current high-voltage and large-current contactor has the problems of strong arc ablation and even no disconnection when a load is switched on and off, so that the arc interruption and arc extinction of the contactor are key technologies of the direct-current high-voltage contactor, the bottleneck technology is mainly overcome at home and abroad for many years, and the technologies generally adopted at home and abroad at present are realized by comprehensive technologies such as arc-striking corner contact, strong magnetic blow, arc-extinguishing grid, vacuum or gas sealing and the like.

The technology commonly adopted at present at home and abroad is realized by comprehensive technologies such as arc-striking corner contact, strong magnetic blow, arc-extinguishing grid, vacuum or gas seal and the like. The technology forcibly extinguishes the electric arc with extremely high energy in a small space and in an extremely short time, and a series of problems of insulation, service life and the like of a contactor are caused due to long electric arc with high voltage and large current, large arc spraying area, high temperature and high corrosion and the like, and vacuum or inflation sealing is needed, so that the production and processing technology is complex, is not easy to popularize and apply, and can only be used in certain specific fields.

Disclosure of Invention

The utility model aims at providing an adopt two breakpoint contacts and single breakpoint contact cooperation to use, ensure the reliable switch-on of contactor and break off direct current high voltage heavy current load, improve the contact system life-span, reduce the production processing technology simultaneously, make its novel direct current high voltage contactor arc extinguishing contact system that can popularize in wide field application.

In order to achieve the above object, the utility model discloses mainly adopt following technical scheme to realize:

a novel arc extinguishing contact system of a direct current high-voltage contactor comprises an electromagnetic assembly, an auxiliary contact assembly A, a main contact assembly and an auxiliary contact assembly B, and is characterized in that the electromagnetic assembly is a magnetic assembly; the main contact subassembly is installed to the electromagnetism subassembly upper end, and mid-mounting has the support, and auxiliary contact subassembly A, auxiliary contact subassembly B are installed respectively at both ends about the support.

The electromagnetic assembly is composed of a core rod, a return spring, a shell, a coil, a movable iron core and a static iron core, wherein the lower end of the core rod is inserted into the static iron core, the movable iron core is arranged on the return spring sleeve placed in the middle of the core rod, the shell is fixedly arranged outside the static iron core, the lower end of the movable iron core is inserted into the upper end of the shell, and the coil is wound outside the movable iron core and the static iron core.

The main contact assembly comprises a contact spring A, a movable contact A, a fixed contact A and a fixed contact B, wherein the movable contact A is fixedly arranged at the upper end of the core rod, the contact spring A is arranged on the movable contact A, the contact spring A is sleeved on the core rod, and one ends of the fixed contact A and the fixed contact B are respectively fixed on the shell.

The auxiliary contact assembly A and the auxiliary contact assembly B are the same and are composed of a contact spring B, a movable contact B, a fixed contact C, an arc striking piece A and an arc striking piece B, the contact spring B is installed at the upper end of the movable contact B, the arc striking piece B is installed at the lower end of the movable contact B, the movable contact B is fixedly installed on the support, one end of the fixed contact C is fixed on the shell, and the arc striking piece B and the arc striking piece A are installed on the movable contact B and the fixed contact C respectively.

The contact gap delta auxiliary between the movable contact B and the fixed contact C is smaller than the contact gap delta main between the movable contact A, the fixed contact A and the fixed contact B, and delta auxiliary +0.3 is smaller than or equal to delta main and is smaller than or equal to delta auxiliary + 0.4.

And the fixed contact C is provided with an arc striking sheet A, the lower end of the movable contact B is provided with an arc striking sheet B, and the included angles theta between the arc striking sheet A and the arc striking sheet B and the normal directions of the fixed contact C and the movable contact B are 15-25 degrees.

According to the technical scheme, compared with the prior art, the technical scheme has obvious beneficial effects that the double-breakpoint contact and the single-breakpoint contact are matched for use, the contacts at two ends of the double-breakpoint movable contact A, the fixed contact A and the fixed contact B are used as main load connection functions, the movable contact B of the single-breakpoint contact, the fixed contact C, the arc striking plate A and the arc striking plate B are used as arc striking and arc extinguishing functions together, so that electric arcs can be quickly extinguished by leading the electric arcs out of the contactor main body through the auxiliary contact system, and the high-temperature and high-corrosion of the electric arcs with high voltage and high current to the contactor main body is prevented on one hand, therefore, the double-breakpoint contact and the single-breakpoint contact are matched for use, the contactor is ensured to be reliably connected and disconnected with a direct-current high-voltage heavy-current load, the service life of a contact system is prolonged, and meanwhile, the production and processing technology is reduced, so that the contactor can be applied and popularized in a wide field.

Drawings

Fig. 1 is a schematic structural diagram 1 of the present invention;

fig. 2 is a schematic structural diagram 2 of the present invention;

fig. 3 is a schematic structural diagram of the electromagnetic assembly of the present invention;

fig. 4 is a schematic structural view of the main contact assembly of the present invention; fig. 5 is a schematic structural view of the auxiliary contact assembly of the present invention; fig. 6 is a schematic circuit diagram of the present invention.

In the drawings, reference numerals

1. The electromagnetic assembly comprises an electromagnetic assembly, 2, auxiliary contact assemblies A, 3, a main contact assembly, 4, auxiliary contact assemblies B, 5, a support, 11, a core rod, 12, a return spring, 13, a shell, 14, a coil, 15, a movable iron core, 16, a fixed iron core, 31, contact springs A, 32, movable contacts A, 33, fixed contacts A, 34, fixed contacts B, 41, contact springs B, 42, movable contacts B, 43, fixed contacts C, 44, arc ignition pieces A, 45 and arc ignition pieces B.

Detailed Description

The following detailed description will be made with reference to the accompanying drawings and preferred embodiments of a novel arc extinguishing contact system of a dc high voltage contactor according to the present invention, and its structure, features and effects.

A novel arc extinguishing contact system of a direct-current high-voltage contactor comprises an electromagnetic assembly 1, an auxiliary contact assembly A2, a main contact assembly 3 and an auxiliary contact assembly B4, and is characterized in that; the main contact assembly 3 is installed to electromagnetism subassembly 1 upper end, and mid-mounting has support 5, and auxiliary contact subassembly A2, auxiliary contact subassembly B4 are installed respectively to both ends about support 5.

The electromagnetic assembly 1 comprises a core bar 11, a return spring 12, a shell 13, a coil 14, a movable iron core 15 and a fixed iron core 16, wherein the lower end of the core bar 11 is inserted into the fixed iron core 16, the middle part of the core bar is placed on the return spring 12, the movable iron core 15 is sleeved on the middle part of the core bar, the shell 13 is fixedly arranged outside the fixed iron core 16, the lower end of the movable iron core 15 is inserted into the upper end of the shell 13, and the coil 14 is wound outside the movable iron core 15 and the fixed iron core 16.

The main contact assembly 3 is composed of a contact spring A31, a movable contact A32, a fixed contact A33 and a fixed contact B34, the movable contact A32 is fixedly installed at the upper end of the core rod 11, a contact spring A31 is installed on the movable contact A32, the contact spring A31 is sleeved on the core rod 11, and one ends of the fixed contact A33 and the fixed contact B34 are respectively fixed on the shell.

The auxiliary contact assembly A2 and the auxiliary contact assembly B4 are the same and are composed of a contact spring B41, a movable contact B42, a fixed contact C43, an arc striking piece A44 and an arc striking piece B45, the contact spring B41 is installed at the upper end of the movable contact B42, the arc striking piece B45 is installed at the lower end of the movable contact B42, the movable contact B42 is fixedly installed on the bracket 5, one end of the fixed contact C43 is fixed on the shell, and the arc striking piece B45 and the arc striking piece A44 are installed on the movable contact B42 and the fixed contact C43 respectively.

The contact gap delta auxiliary between the movable contact B42 and the fixed contact C43 is smaller than the contact gap delta main between the movable contact A32, the fixed contact A33 and the fixed contact B34, and the delta auxiliary +0.3 is less than or equal to the delta main and less than or equal to the delta auxiliary + 0.4.

The fixed contact C43 is provided with an arc striking sheet A44, the lower end of the movable contact B42 is provided with an arc striking sheet B45, and the included angle theta between the arc striking sheet A44 and the arc striking sheet B45 and the normal directions of the fixed contact C43 and the movable contact B42 is 15-25 degrees.

The working principle is as follows:

the working principle that the double-breakpoint contact and the single-breakpoint contact are matched for use is adopted: the arc is mainly guided to an auxiliary contact system for arc extinction, so that an electromagnetic system 1 and a main contact system 3 serving as a contactor main body are not damaged by the arc, as shown in fig. 2, a contact gap delta auxiliary of the auxiliary contact system is smaller than a contact gap delta main of the main contact system, delta auxiliary +0.3 is larger than or equal to delta main and is smaller than or equal to delta auxiliary +0.4, when a coil 14 in the electromagnetic system 1 is electrified, electromagnetic attraction is generated in a magnetic circuit, a movable iron core 15 moves downwards so as to drive a core rod 11 connected with the movable iron core 15 to move downwards, and a movable contact A32 and two movable contacts B42 are driven to move downwards, and as the delta auxiliary is smaller than or equal to the delta main, two movable contacts B42 and two fixed contacts C43 are firstly disconnected to a closed state from a disconnection state to a connection state, and then the movable contact A32, the fixed contact A33 and the fixed contact B34 are disconnected to a closed state from the connection state to the connection state; conversely, when the electromagnetic attraction in the magnetic circuit disappears after the coil 14 is de-energized, the force of the return spring 12 makes the plunger 15 return upward, so as to make the moving contact a32 and the two moving contacts B42 move upward, firstly the moving contact a32 and the fixed contacts a33 and B34 are closed to open, and secondly the moving contact B42 and the fixed contacts C43 are closed to open, so as to open the load, therefore, the two moving contacts B42 and the two fixed contacts C43 are firstly connected and disconnected at the moment of connecting and disconnecting the load, the moving contact a32 and the fixed contacts a33 and B34 mainly perform the connecting function in the middle, the line connection is shown in fig. 2, the main contact system 3 and the auxiliary contact system a2 and B4 have important functions, the main contact system 3 ensures reliable connection when being connected, and the contact pressure drop is required to be small, and the conductivity is high. The auxiliary contact system A2 and the auxiliary contact system B4 mainly play an arc extinguishing role, and the contacts are required to be resistant to electric corrosion and high temperature.

The arc extinguishing working principle of the auxiliary contact system is as follows: as shown in fig. 2, an arc striking plate B45 and an arc striking plate a44 are respectively added to the moving contact B42 and the fixed contact C43, an included angle theta between the arc striking plate a44 and the arc striking plate B45 and the normal direction of the contact is 15-25 degrees, when the two moving contacts B42 and the two fixed contacts C43 break the load, the arc striking plate a44 and the arc striking plate B45 rapidly guide the electric charges to the tips of the two arc striking plates by using the tip effect of the electric charges, so that the electric field intensity of the electric arc between the two moving contacts B42 and the two fixed contacts C43 is rapidly reduced to quench the arc, and the sizes, lengths and the included angle theta of the arc striking plate a44 and the arc striking plate B45 can be adjusted according to different loads.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form, and any simple modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention.

Claims

1. A novel arc extinguishing contact system of a direct-current high-voltage contactor comprises an electromagnetic assembly (1), an auxiliary contact assembly A (2), a main contact assembly (3) and an auxiliary contact assembly B (4), and is characterized in that the electromagnetic assembly A is a magnetic assembly; main contact subassembly (3) are installed to electromagnetic component (1) upper end, and mid-mounting has support (5), and auxiliary contact subassembly A (2), auxiliary contact subassembly B (4) are installed respectively at both ends about support (5).

2. The novel arc extinguishing contact system of the direct current high voltage contactor as claimed in claim 1, wherein: the electromagnetic component (1) is composed of a core rod (11), a return spring (12), a shell (13), a coil (14), a movable iron core (15) and a static iron core (16), wherein the lower end of the core rod (11) is inserted into the static iron core (16), the return spring (12) is placed in the middle of the core rod and sleeved with the movable iron core (15), the shell (13) is fixedly installed outside the static iron core (16), the lower end of the movable iron core (15) is inserted into the upper end of the shell (13), and the coil (14) is wound outside the movable iron core (15) and the static iron core (16).

3. The novel arc extinguishing contact system of the direct current high voltage contactor as claimed in claim 1, wherein: the main contact assembly (3) is composed of a contact spring A (31), a movable contact A (32), a fixed contact A (33) and a fixed contact B (34), the movable contact A (32) is fixedly installed at the upper end of the core rod (11), the contact spring A (31) is installed on the movable contact A (32), the contact spring A (31) is sleeved on the core rod (11), and one end of the fixed contact A (33) and one end of the fixed contact B (34) are respectively fixed on the shell.

4. The novel arc extinguishing contact system of the direct current high voltage contactor as claimed in claim 1, wherein: the auxiliary contact assembly A (2) and the auxiliary contact assembly B (4) are the same and are composed of a contact spring B (41), a movable contact B (42), a fixed contact C (43), an arc striking piece A (44) and an arc striking piece B (45), the contact spring B (41) is installed at the upper end of the movable contact B (42), the arc striking piece B (45) is installed at the lower end of the movable contact B (42), the movable contact B (42) is fixedly installed on the support (5), one end of the fixed contact C (43) is fixed on the shell, and the arc striking piece B (45) and the arc striking piece A (44) are installed on the movable contact B (42) and the fixed contact C (43) respectively.

5. The novel arc extinguishing contact system of the direct current high voltage contactor as claimed in claim 4, wherein: the contact gap delta auxiliary between the moving contact B (42) and the fixed contact C (43) is smaller than the contact gap delta main between the moving contact A (32), the fixed contact A (33) and the fixed contact B (34), and delta auxiliary +0.3 is smaller than or equal to delta main and is smaller than or equal to delta auxiliary + 0.4.

6. The novel arc extinguishing contact system of the direct current high voltage contactor as claimed in claim 4, wherein: the fixed contact C (43) is provided with an arc striking piece A (44), the lower end of the movable contact B (42) is provided with an arc striking piece B (45), and the included angles theta of the arc striking piece A (44) and the arc striking piece B (45) with the normal directions of the fixed contact C (43) and the movable contact B (42) are 15-25 degrees.