An arc extinguishing system for a DC contactor

Abstract

An arc extinguishing system for a DC contactor, comprising two static contacts (1, 1') and a moving contact (2) as well as two permanent magnets. The two static contacts (1, 1') are respectively engaged with and disengaged from the moving contacts at both ends of the moving contact (2) to achieve the on-off of the contactor. It is characterized in that: the two permanent magnets are installed on the connection line of the two static contacts (1, 1'), and are located between the two static contacts (1, 1'). The entire arc extinguishing system is small in volume, strong in breaking capacity, simple in structure, convenient in assembly, and can achieve non-polar rapid arc extinguishing.

Description

Technical Field

[0001] The invention belongs to the technical field of DC contactors, and specifically relates to an arc extinguishing system for a DC contactor. Background Art

[0002] With the rapid development of new energy vehicles, the charging piles supporting them will also be widely popularized, and DC contactors will be used in both new energy vehicles and charging piles. Since charging piles generally have two gun heads, in order to achieve simultaneous operation of both guns or high-power operation of a single gun, non-polar DC contactors with high-index breaking are required inside the charging piles. Therefore, a DC contactor that can simultaneously achieve high-index breaking and non-polarity of the main circuit is particularly important for the new energy vehicle industry.

[0003] Chinese Patent ZL201210038922.2 discloses a non-polar hydrogen mixed gas DC arc extinguishing system for a DC contactor. The DC arc extinguishing system includes a moving contact, 4 pairs of moving and static arc initiating contacts, a static contact, a grid group, and a permanent magnet. It is non-polar, that is, the change of the current direction will not affect its arc extinguishing performance. The invention designs an arc initiating contact to guide the arc to move smoothly along the trajectory of the arc initiating contact, and reasonably arranges the positions and structures of the arc initiating contact, the grid group, and the permanent magnet to extinguish the arc between the moving and static contacts better and faster, thus solving the short-circuit problem caused by the sudden reverse of the current and further improving the breaking capacity. This DC contactor requires poor operation of charging magnetism on both sides.

[0004] Chinese Patent ZL201310341347.8 discloses a non-polar high-voltage DC contactor arc extinguishing system with reliable arc extinguishing, including a sealed contact chamber of a contactor and two permanent magnets. By installing the permanent magnets on the extension line side of the connection line of the two static contacts and setting the magnetic direction of the permanent magnets to be non-perpendicular to the current direction between the moving and static contacts, the non-polar electrical life performance is improved. However, this DC arc extinguishing system occupies a large space and cannot meet the requirements of the spatial component layout in some cases. Summary of the Invention

[0005] The purpose of the invention is to address the technical defects of the existing arc extinguishing system for DC contactors, such as difficult magnetization operation or large occupied space. The invention provides an arc extinguishing system for a DC contactor. By installing the permanent magnet inside the connection line of the two static contacts, designing a new shape of the permanent magnet on the existing DC contactor, and realizing the installation and fixation of the permanent magnet position by changing the shape of the insulating part between the electromagnetic system and the contact system, while meeting the requirement of unchanged installation dimensions of the product, the existing contactor is enabled to increase the function of non-polar arc initiation. The entire arc extinguishing system is small in volume, strong in breaking capacity, simple in structure, convenient in assembly, and can achieve non-polar rapid arc extinguishing.

[0006] Technical Solution

[0007] To achieve the above technical object, an arc extinguishing system of a DC contactor provided by the present invention includes two static contacts, a moving contact, and two permanent magnets. The two static contacts are respectively engaged with and disengaged from the moving contacts at both ends of the moving contact to realize the on-off of the contactor. It is characterized in that: the two permanent magnets are installed on the connection line of the two static contacts and are located between the two static contacts.

[0008] Further, the two permanent magnets are permanent magnet one, and the permanent magnet one is installed in the permanent magnet installation groove one on the static contact bracket one and is located between the upper end face and the lower end face of the two static contacts. The polar directions of the two poles of the permanent magnet one are vertically the same and are perpendicular to the movement direction of the arc generated when the two static contacts and the moving contacts at both ends of the moving contact are disengaged.

[0009] Further, the two static contacts are installed on the static contact bracket one, the static contact bracket one is fixedly installed on the insulating part one, the insulating part one is fixedly installed on the armature one, the armature one is installed on the upper end face of the electromagnetic coil skeleton one, the moving contact is installed at the upper end of the shaft one and is limited by the spring clip one, the contact spring is sleeved on the shaft one, one end abuts against the moving contact, and the other end abuts against the boss on the shaft one. The other end of the shaft one passes through the insulating part one and the armature one and is equipped with a moving iron core one. The reaction spring is sleeved on the shaft one and can reset the moving iron core one. A spring clip two is installed on the shaft one outside the moving iron core one for limiting.

[0010] Further, the static contact bracket one is installed at the mouth of the magnetic sleeve one to form a sealed cavity. The two static contacts are inserted into the static contact bracket one, one end extends into the sealed cavity to correspond to the moving contact, and the other end extends out of the magnetic sleeve one. The electromagnetic coil skeleton one is installed at the bottom of the magnetic sleeve one. The moving iron core one is located in the inner cavity of the electromagnetic coil skeleton one. An armature two is arranged between the moving iron core one and the electromagnetic coil skeleton one. The magnetic sleeve one is installed in the outer shell one. An armature three is installed between the bottom of the inner cavity of the outer shell one and the magnetic sleeve one.

[0011] Further, the two permanent magnets are permanent magnet two, and the permanent magnet two is installed in the permanent magnet installation groove two on the insulating part two. The polar directions of the two poles of the two permanent magnet two are vertically the same and are perpendicular to the movement direction of the arc generated when the two static contacts and the moving contacts at both ends of the moving contact are disengaged.

[0012] Further, the two static contacts are inserted into the second static contact support. The lower ends of the two static contacts are fixedly installed on the second insulating part. The second static contact support is fixedly installed on the second insulating part, and the second insulating part is fixedly installed on the fourth armature. The moving contact is sleeved on the second shaft and limited by the third spring clip. The second ejector rod is installed together with the moving contact. The upper end of the second shaft abuts against the second static contact support. The second contact spring is sleeved on the second shaft, with its lower end abutting against the moving contact and its upper end abutting against the fourth spring clip on the upper end head of the second shaft. The second reaction spring is sleeved on the second shaft and can reset the second moving iron core fixedly installed on the second shaft.

[0013] Further, one end of the second reaction spring abuts against the second insulating part, and the other end abuts against the third spring clip.

[0014] Further, the two permanent magnets are the third permanent magnets. The third permanent magnets are installed in the third permanent magnet installation grooves on the third static contact support, between the upper and lower end faces of the two static contacts. The polar directions of the two poles of the third permanent magnets are horizontally opposite and parallel to the arc movement direction generated when the moving contacts at both ends of the two static contacts and the moving contact are separated.

[0015] Advantageous Effects

[0016] An arc extinguishing system of a DC contactor provided by the present invention installs a permanent magnet inside the connection line of two static contacts, designs a new shape of the permanent magnet on the existing DC contactor, and realizes the installation and fixation of the permanent magnet position by changing the shape of the insulating part between the electromagnetic system and the contact system, while meeting the requirement that the installation dimensions of the product remain unchanged, so that the existing contactor increases the function of non-polar arc ignition. The entire arc extinguishing system is small in volume, strong in breaking capacity, simple in structure, convenient in assembly, and can achieve non-polar rapid arc extinguishing. Brief Description of the Drawings

[0017] Att Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention.

[0018] Att Figure 2 is a schematic diagram of the position of the permanent magnet in Embodiment 1 of the present invention.

[0019] Att Figure 3a is a three-dimensional schematic diagram of the arc force in Embodiment 1 of the present invention.

[0020] Att Figure 3b is a schematic diagram of the arc force in Embodiment 1 of the present invention.

[0021] Att Figure 4 is a schematic structural diagram of Embodiment 2 of the present invention.

[0022] Att Figure 5 is a schematic diagram of the position of the permanent magnet in Embodiment 2 of the present invention.

[0023] AttFigure 6a It is a three-dimensional schematic diagram of the arc force in Embodiment 2 of the present invention.

[0024] Appendix Figure 6b It is a schematic diagram of the arc force in Embodiment 2 of the present invention.

[0025] Appendix Figure 7 It is a schematic structural diagram of Embodiment 3 of the present invention.

[0026] Appendix Figure 8 It is a schematic diagram of the position of the permanent magnet in Embodiment 3 of the present invention.

[0027] Appendix Figure 9a It is a schematic diagram of the arc force in Embodiment 3 of the present invention Figure 1 .

[0028] Appendix Figure 9b It is a schematic diagram of the arc force in Embodiment 3 of the present invention Figure 2 . Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] As shown in the appendix Figure 1 , in the first embodiment provided by the present invention, a DC contactor is involved. A static contact support 4 is installed at the mouth of a magnetic sleeve 13 to form a sealed cavity. Two static contacts 1, 1' are inserted into the static contact support 4. One end extends into the sealed cavity to correspond to the moving contact 2, and the other end extends out of the magnetic sleeve 13. The static contact support 4 is fixedly installed on an insulating member 5, and the insulating member 5 is fixedly installed on an armature 6. The armature 6 is installed on the upper end face of an electromagnetic coil skeleton 7, and the electromagnetic coil skeleton 7 is installed at the bottom of the magnetic sleeve 13. A moving iron core 11 is located in the inner cavity of the electromagnetic coil skeleton 7. An armature 14 is provided between the moving iron core 11 and the electromagnetic coil skeleton 7. The magnetic sleeve 13 is installed in a housing 15, and an armature 16 is installed between the bottom of the inner cavity of the housing 15 and the magnetic sleeve 13.

[0031] In the contact system of this DC contactor, the moving contact 2 is installed at the upper end of a shaft 8 and limited by a spring clip 9. A contact spring 10 is sleeved on the shaft 8, one end abuts against the moving contact 2, and the other end abuts against a boss 801 on the shaft 8. The other end of the shaft 8 passes through the insulating member 5 and the armature 6 and is equipped with a moving iron core 11. A reaction spring 12 is sleeved on the shaft 8 to enable the moving iron core 11 to reset, and a spring clip 21 is installed on the shaft 8 outside the moving iron core 11 for limiting. Two permanent magnets are installed on the connection line of the two static contacts 1, 1', and are located between the two static contacts 1, 1'. In this embodiment, specifically speaking, as shown in the appendix Figure 2As shown, the two permanent magnets are permanent magnet 1 3a, 3a', and the permanent magnet 1 3a, 3a' are installed in the permanent magnet 1 installation groove 401 on the static contact support 1 4, located between the upper and lower end faces of the two static contacts 1, 1'. The polar directions of the two poles of the permanent magnet 1 3a, 3a' are vertically upward and perpendicular to the arc movement direction generated when the moving contacts at both ends of the two static contacts 1, 1' and the moving contact 2 are separated.

[0032] As shown in Figure 3, the two static contacts 1, 1' are respectively engaged with and separated from the moving contacts at both ends of the moving contact 2 to realize the on-off of the contactor. An arc is generated during the breaking process. Then, when the arc is generated, as shown in the attached Figure 3a and 3b shown, the direction is from the left static contact 1, moving contact 2 to the right static contact 1'. The magnetic field direction generated by the permanent magnet 1 3a and 3a' is from the lower end to the upper end of the static contact support 1 4. According to the left-hand rule, as shown in the attached Figure 3b shown, the force F on the arc generated by the left static contact 1 and moving contact 2 is perpendicular to the paper and inward. The force F on the arc generated by the right static contact 1' and moving contact 2 is perpendicular to the paper and inward. The movement directions of the two arcs are the same, but due to the insulating part 1 5 between them, they will not collide and cause a short circuit. When the direction is from the right static contact 1', moving contact 2 to the left static contact 1, the arc force is perpendicular to the outside.

[0033] As shown in the attached Figure 4 shown, another embodiment provided by the present invention is: the two static contacts 1, 1' are inserted and installed on the static contact support 2 4'. The lower ends of the two static contacts 1, 1' are fixedly installed on the insulating part 2 5'. The static contact support 2 4' is fixedly installed on the insulating part 2 5'. The insulating part 2 5' is fixedly installed on the armature 4 17. The moving contact 2' is sleeved on the shaft 2 8' and limited by the spring clip 3 18. The ejector rod 2 22 is installed together with the moving contact 2'. The upper end of the shaft 2 8' abuts against the static contact support 2 4'. The contact spring 2 10' is sleeved on the shaft 2 8', the lower end abuts against the moving contact 2', and the upper end abuts against the spring clip 4 19 on the upper end head of the shaft 2 8'. The reaction spring 2 20 is sleeved on the shaft 2 8' and can reset the moving iron core 2 11' fixedly installed on the shaft 2 8'. In this embodiment, one end of the reaction spring 2 20 abuts against the moving iron core 2 11', and the other end abuts against the spring clip 3 18.

[0034] In this embodiment, specifically, as shown in the attached Figure 5As shown, the two permanent magnets are two permanent magnets II 3b and 3b'. The two permanent magnets II 3b and 3b' are installed in the permanent magnet installation groove II 401' on the static contact support II 4', below the lower end faces of the two static contacts 1 and 1'. The polar directions of the two poles of the two permanent magnets II 3b and 3b' are vertically upward and perpendicular to the arc movement direction generated when the moving contacts at both ends of the two static contacts 1 and 1' and the moving contact 2' are disengaged.

[0035] Appendix Figure 6a and 6b As shown, the force condition of the arc during the breaking process of this embodiment is: when the arc is generated, the direction is from the left static contact 1, moving contact 2 to the right static contact 1'. The magnetic field direction generated by the permanent magnets II 3b and 3b' is from the upper end to the lower end of the insulator II 5'. According to the left-hand rule, as shown in Appendix Figure 6b As shown, the force F' on the arc generated by the left static contact 1 and moving contact 2 is perpendicular outward, and the force F' on the arc generated by the right static contact 1' and moving contact 2 is perpendicular outward. The movement directions of the two arcs are the same. When the direction is from the right static contact 1', moving contact 2 to the left static contact 1, the arc force is perpendicular inward.

[0036] As shown in Appendix Figure 7 As shown, another embodiment provided by the present invention includes two permanent magnets as permanent magnets III 3c and 3c'. As shown in Appendix Figure 8 As shown, the permanent magnets III 3c and 3c' are installed in the permanent magnet I installation groove III 401" on the static contact support III 4", between the upper and lower end faces of the two static contacts 1 and 1'. The polar directions of the two poles of the permanent magnet I 3a and 3a' are horizontally outward and parallel to the arc movement direction generated when the moving contacts at both ends of the two static contacts 1 and 1' and the moving contact 2 are disengaged. The installation methods of other components of this DC contactor are the same as those of the above second embodiment and will not be further described here.

[0037] As shown in Appendix Figure 9a and 9b As shown, the force condition of the arc during the breaking process of this embodiment is: when the arc is generated, the direction is from the left static contact 1, moving contact 2 to the right static contact 1'. The magnetizing directions of the permanent magnets III 3c and 3c' are as shown in Appendix Figure 9b As shown, according to the left-hand rule, as shown in Appendix Figure 9b As shown, the force F" on the arc generated by the left static contact 1 and moving contact 2 is perpendicular outward, and the force F" on the arc generated by the right static contact 1' and moving contact 2 is perpendicular downward and outward. The movement directions of the two arcs are the same. When the direction is from the right static contact 1', moving contact 2 to the left static contact 1, the arc force is perpendicular inward.

[0038] An arc extinguishing system for a DC contactor provided by the present invention installs a permanent magnet inside the connection line of two static contacts, designs a new shape of the permanent magnet on the existing DC contactor, and realizes the installation and fixation of the position of the permanent magnet by changing the shape of the insulating part between the electromagnetic system and the contact system, while meeting the requirement that the installation dimensions of the product remain unchanged. Thus, the existing contactor is increased with the function of non-polar arc ignition. The whole arc extinguishing system is small in volume, strong in breaking capacity, simple in structure, and convenient for assembly, and can realize non-polar rapid arc extinguishing.

[0039] The structures, ratios, sizes, quantities, etc. shown in the drawings of the embodiments of the present invention are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present invention can be implemented.

Claims

1. An arc extinguishing system for a DC contactor, comprising two static contacts (1, 1') and a moving contact (2) as well as two permanent magnets. The two static contacts (1, 1') are respectively engaged with and disengaged from the moving contacts at both ends of the moving contact (2) to achieve the on-off of the contactor. It is characterized in that: The two permanent magnets are installed on the connection line of the two static contacts (1, 1'), and are located between the two static contacts (1, 1'); The two permanent magnets are the first permanent magnets (3a, 3a'), and the first permanent magnets (3a, 3a') are installed in the first permanent magnet installation grooves (401) on the first static contact bracket (4), and are located between the upper and lower end faces of the two static contacts (1, 1'). The polar directions of the two poles of the first permanent magnets (3a, 3a') are vertically the same and perpendicular to the arc movement direction generated when the moving contacts at both ends of the two static contacts (1, 1') and the moving contact (2) are separated; The two static contacts (1, 1') are installed on the first static contact bracket (4), the first static contact bracket (4) is fixedly installed on the first insulating part (5), the first insulating part (5) is fixedly installed on the first armature (6), the first armature (6) is installed on the upper end face of the first electromagnetic coil skeleton (7), the moving contact (2) is installed at the upper end of the first shaft (8) and is limited by the first spring clip (9), the first contact spring (10) is sleeved on the first shaft (8), one end abuts against the moving contact (2), and the other end abuts against the boss (801) on the first shaft (8). The other end of the first shaft (8) passes through the first insulating part (5) and the first armature (6) and is equipped with the first moving iron core (11). The first reaction spring (12) is sleeved on the first shaft (8) and can reset the first moving iron core (11). The second spring clip (21) is installed on the first shaft (8) outside the first moving iron core (11) for limiting.

2. The arc extinguishing system of a DC contactor according to claim 1, characterized in that: The first static contact bracket (4) is installed at the mouth of the first magnetic sleeve (13) to form a sealed cavity. The two static contacts (1, 1') are inserted into the first static contact bracket (4), one end extends into the sealed cavity and corresponds to the moving contact (2), and the other end extends out of the first magnetic sleeve (13). The first electromagnetic coil skeleton (7) is installed at the bottom of the first magnetic sleeve (13). The first moving iron core (11) is located in the inner cavity of the first electromagnetic coil skeleton (7). A second armature (14) is provided between the first moving iron core (11) and the first electromagnetic coil skeleton (7). The first magnetic sleeve (13) is installed in the first housing (15), and a third armature (16) is installed between the bottom of the inner cavity of the first housing (15) and the first magnetic sleeve (13).

3. An arc extinguishing system for a DC contactor, comprising two static contacts (1, 1') and a moving contact (2'), as well as two permanent magnets. The two static contacts (1, 1') are respectively engaged with and disengaged from the moving contacts at both ends of the moving contact (2') to achieve the on-off of the contactor. It is characterized in that: The two permanent magnets are installed on the connection line of the two static contacts (1, 1'), and are located between the two static contacts (1, 1'); The two permanent magnets are the second permanent magnets (3b, 3b'), and the second permanent magnets (3b, 3b') are installed in the second permanent magnet installation grooves (401') on the second insulating part (5'). The polar directions of the two poles of the second permanent magnets (3b, 3b') are vertically the same and perpendicular to the arc movement direction generated when the moving contacts at both ends of the two static contacts (1, 1') and the moving contact (2') are separated; The two static contacts (1, 1') are inserted into the second static contact support (4'), the lower ends of the two static contacts (1, 1') are fixedly installed on the second insulating part (5'), the second static contact support (4') is fixedly installed on the second insulating part (5'), the second insulating part (5') is fixedly installed on the fourth armature (17), the moving contact (2') is sleeved on the second shaft (8') and limited by the third spring clip (18), the second ejector rod (22) is installed together with the moving contact (2'), the upper end of the second shaft (8') abuts against the second static contact support (4'), the second contact spring (10') is sleeved on the second shaft (8'), the lower end abuts against the moving contact (2'), and the upper end abuts against the fourth spring clip (19) on the upper end head of the second shaft (8'), and the second reaction spring (20) is sleeved on the second shaft (8') and can reset the second moving iron core (11') fixedly installed on the second shaft (8').

4. The arc extinguishing system of a DC contactor according to claim 3, characterized in that: One end of the second reaction spring (20) abuts against the second insulating part (5'), and the other end abuts against the third spring clip (18).

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