CN213936054U

CN213936054U - DC contactor with high short-circuit resistance

Info

Publication number: CN213936054U
Application number: CN202022928175.2U
Authority: CN
Inventors: 许毅; 顾春朋; 王龙江; 彭涛; 陈建华; 徐华
Original assignee: Kunshan Guoli Yuantong New Energy Technology Co ltd
Current assignee: Kunshan Guoli Yuantong New Energy Technology Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-08-10
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a direct current contactor with high short circuit resistance, which comprises a shell, two static contacts arranged on the top side of the shell side by side, a moving contact arranged in the shell in a vertical opposite way with the two static contacts, and a driving mechanism arranged in the shell in a vertical opposite way and connected with the moving contact, wherein the driving mechanism can drive the moving contact to be connected or disconnected with the two static contacts in an attraction way; the magnetic circuit breaker is characterized by further comprising a lower armature and a pair of upper armatures, wherein the lower armature is wrapped outside the moving contact, the pair of upper armatures are arranged on the inner wall of the top of the shell side by side and are opposite to the position above the lower armature, and when the moving contact is respectively communicated with the two fixed contacts in an attraction manner, the pair of upper armatures can respectively form a magnetic circuit with the lower armature so as to generate electromagnetic attraction force with the moving contact in an upward stress direction. The direct current contactor can effectively limit the action of the moving contact to be separated from the static contact, can effectively inhibit the generation of electric arcs, and improves the short-circuit resistance and the use safety of the direct current contactor during working.

Description

DC contactor with high short-circuit resistance

Technical Field

The utility model relates to a direct current relay technical field specifically provides a direct current contactor with high anti short circuit ability.

Background

When the relay passes through current, due to the electromagnetic action, electric repulsion force can be generated on the moving contact, the direction of the electric repulsion force is opposite to the direction of the force exerted on the moving contact by the contact spring, so that the moving contact generates a movement trend separated from the fixed contact, if the current flowing through the moving contact is large, the moving contact is separated from the fixed contact, and a large-current electric arc is generated between the moving contact and the fixed contact, so that the product is invalid.

In view of this, the present invention is especially provided.

Disclosure of Invention

In order to overcome the defects, the utility model provides a direct current contactor with high anti short circuit ability, it can effectively restrict the moving contact will with the action of static contact separation can effectively restrain the production of electric arc, has promoted the anti short circuit ability and the safety in utilization of its during operation greatly.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a direct current contactor with high short circuit resistance comprises a shell, two static contacts arranged on the top side of the shell side by side, a moving contact arranged in the shell and vertically opposite to the two static contacts respectively, and a driving mechanism arranged in the shell and connected with the moving contact, wherein the driving mechanism can drive the moving contact to be attracted with or disconnected from the two static contacts; the magnetic circuit breaker is characterized by further comprising a lower armature and a pair of upper armatures, wherein the lower armature is wrapped outside the moving contact, the pair of upper armatures are arranged on the inner wall of the top of the shell side by side and are opposite to the position above the lower armature, and when the moving contact is respectively attracted and communicated with the two fixed contacts, the pair of upper armatures can respectively form a magnetic circuit with the lower armature so as to generate electromagnetic attraction force with the moving contact in an upward stress direction.

As a further improvement of the present invention, the housing has a ceramic housing and a shielding shell positioned in the ceramic housing;

two mounting holes for mounting the static contact are respectively formed in the ceramic shell and the shielding shell, and the two mounting holes in the ceramic shell are respectively in one-to-one correspondence with and communicated with the two mounting holes in the shielding shell;

the moving contact is of a strip plate-shaped structure and is movably arranged in the shielding shell.

As a further improvement of the present invention, the lower armature is a long-strip-shaped U-shaped groove structure extending along the length direction of the moving contact and having a U-shaped vertical cross-section, and the lower armature is wrapped outside the middle part of the moving contact in an interference tight fit manner;

the two upper armatures are all arc-shaped blocks, and the two upper armatures are embedded on the inner wall of the top of the shielding shell side by side and are opposite to the positions above the lower armatures.

As a further improvement, the actuating mechanism has place in place coil, the activity of shell inner chamber lower part department is arranged in the active cell in the space that the coil encloses and one along vertical arrangement's push rod, the lower extreme tight fit of push rod is inserted and is arranged in the active cell, contact spring has been cup jointed in the location on the upper end of push rod, contact spring elasticity butt in on the lower armature downside, it is right to lower armature reaches an upward elastic support power is applyed to the moving contact.

The utility model has the advantages that: a lower armature is wrapped outside the movable contact, and a pair of upper armatures are arranged on the inner wall of the top of the shell and opposite to the position above the lower armature side by side, so that when the movable contact is respectively attracted and communicated with the two fixed contacts, a magnetic loop can be formed between each of the pair of upper armatures and the lower armature, and an electromagnetic attraction force with an upward stress direction is generated on the movable contact; by means of the electromagnetic attraction, the attraction binding force between the moving contact and the fixed contact can be increased, and then the electric repulsion force generated between the moving contact and the fixed contact can be resisted, so that the action that the moving contact is separated from the fixed contact can be effectively limited, the generation of electric arcs can be effectively inhibited, and the short-circuit resistance and the use safety of the direct current contactor during working are greatly improved.

Drawings

Fig. 1 is a schematic cross-sectional structural view of the dc contactor of the present invention (the movable contact is disconnected from the two fixed contacts);

fig. 2 is a schematic view of the state of the lower armature and the upper armature combination of the present invention when the moving contact is in attraction communication with the two static contacts;

fig. 3 is a schematic cross-sectional view of the lower armature and the upper armature assembly of the present invention at a first viewing angle;

fig. 4 is a schematic cross-sectional view of the lower armature and the upper armature assembly at a second viewing angle according to the present invention.

The following description is made with reference to the accompanying drawings:

1-a housing; 10-a ceramic housing; 11-a shielding shell; 2, static contact; 3, a moving contact; 4-lower armature; 5-upper armature; 6, a coil; 7-a mover; 8, a push rod; 9-contact spring.

Detailed Description

Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the disclosure herein.

It should be understood that the structures, ratios, sizes, etc. shown in the drawings attached to the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relation or adjustment of the size should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the function and the achievable purpose of the present invention.

Example (b):

please refer to fig. 1 and 2, which are schematic diagrams of a cross-sectional structure of the dc contactor of the present invention (the moving contact and the two fixed contacts are in an off state), and a state of the combination of the lower armature and the upper armature when the moving contact and the two fixed contacts are in an attraction connection.

The utility model discloses a direct current contactor with high anti short-circuit ability include shell 1, two static contacts 2 installed side by side on the top side of shell 1, place in shell 1 and respectively with two static contacts 2 along vertical relative arrangement's moving contact 3 and place in shell 1 and with the actuating mechanism of moving contact 3 connection, and actuating mechanism can drive moving contact 3 and two static contacts 2 attract each other to close and communicate or break off; in particular, a lower armature 4 and a pair of upper armatures 5 are also provided, the lower armature 4 is wrapped outside the movable contact 3, the pair of upper armatures 5 are arranged on the top inner wall of the shell 1 side by side and are opposite to the position above the lower armature 4, when the moving contact 3 is respectively communicated with the two fixed contacts 2 in an attraction way, the pair of upper armatures 5 can form a magnetic loop with the lower armature 4 respectively to generate an electromagnetic attraction force with an upward force bearing direction on the moving contact 3, the attraction and binding force between the moving contact and the static contact can be increased, and the electric repulsion force generated between the moving contact and the static contact can be resisted, therefore, the action that the moving contact is separated from the fixed contact can be effectively limited, the generation of electric arcs can be effectively inhibited, and the short-circuit resistance and the use safety of the direct current contactor during working are greatly improved.

In this embodiment, it is preferable that the housing 1 has a ceramic housing 10 and a shield case 11 positioned and built in the ceramic housing 10;

two mounting holes for mounting the static contact 2 are respectively formed in the ceramic shell 10 and the shielding shell 11, and the two mounting holes in the ceramic shell 10 are respectively in one-to-one correspondence with and communicated with the two mounting holes in the shielding shell (11); the moving contact 3 is a strip plate structure and is movably arranged in the shielding shell 11.

The above description is only an example, but the practical application is not limited to the housing/movable contact/static contact structure and the mounting method.

In this embodiment, preferably, the lower armature 4 is a long-strip-shaped U-shaped groove structure (see fig. 3 and 4) extending along a length direction of the movable contact 3 and having a U-shaped vertical cross section, and the lower armature 4 is wrapped outside a middle portion of the movable contact 3 in an interference tight fit manner;

the two upper armatures 5 are both arch-shaped blocks (see the attached figures 3 and 4), and the two upper armatures 5 are embedded on the top inner wall of the shielding shell 11 side by side through an injection molding process and are opposite to the position above the lower armature 4. Will go up armature design into domes, can promote go up armature with the cohesion between the shield shell effectively prevents go up armature is pulled out.

In this embodiment, preferably, the driving mechanism has a coil 6 built in the lower portion of the inner cavity of the housing 1, a mover 7 movably disposed in a space enclosed by the coil 6, and a push rod 8 vertically disposed, a lower end of the push rod 8 is tightly fitted and inserted in the mover 7, an upper end of the push rod 8 is positioned and sleeved with a contact spring 9, and the contact spring 9 elastically abuts against the lower side of the lower armature 4 to apply an upward elastic supporting force to the lower armature 4 and the movable contact 3; in particular, reference is made to fig. 1.

To sum up, the utility model discloses an armature is equipped with outside the moving contact, on the shell top inner wall and just to being provided with a pair of upper armatures side by side to the position that is located above the lower armature, so when the moving contact respectively with two the static contact actuation intercommunication, this pair of upper armatures respectively can with form the magnetic circuit between the lower armature, in order to produce the ascending electromagnetic attraction of atress direction to the moving contact; by means of the electromagnetic attraction, the attraction binding force between the moving contact and the fixed contact can be increased, and then the electric repulsion force generated between the moving contact and the fixed contact can be resisted, so that the action that the moving contact is separated from the fixed contact can be effectively limited, the generation of electric arcs can be effectively inhibited, and the short-circuit resistance and the use safety of the direct current contactor during working are greatly improved.

The above description is only a preferred embodiment of the present invention, but not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as within the protection scope of the present invention.

Claims

1. A direct current contactor with high short circuit resistance comprises a shell (1), two static contacts (2) arranged on the top side of the shell (1) side by side, a moving contact (3) arranged in the shell (1) and vertically opposite to the two static contacts (2) respectively, and a driving mechanism arranged in the shell (1) and connected with the moving contact (3), wherein the driving mechanism can drive the moving contact (3) to be attracted, connected or disconnected with the two static contacts (2); the method is characterized in that: the electromagnetic contactor is characterized by further comprising a lower armature (4) and a pair of upper armatures (5), wherein the lower armature (4) is arranged outside the movable contact (3), the pair of upper armatures (5) are arranged on the inner wall of the top of the shell (1) side by side and are just opposite to the position above the lower armature (4), and when the movable contact (3) is respectively attracted and communicated with the two static contacts (2), the pair of upper armatures (5) can respectively form a magnetic loop with the lower armature (4) so as to generate an electromagnetic attraction force with the upward stress direction on the movable contact (3).

2. The direct current contactor with high short circuit resistance according to claim 1, wherein: the shell (1) is provided with a ceramic shell (10) and a shielding shell (11) which is positioned and arranged in the ceramic shell (10);

two mounting holes for mounting the static contact (2) are respectively formed in the ceramic shell (10) and the shielding shell (11), and the two mounting holes in the ceramic shell (10) are respectively in one-to-one correspondence with and communicated with the two mounting holes in the shielding shell (11);

the moving contact (3) is of a strip plate-shaped structure and is movably arranged in the shielding shell (11).

3. The direct current contactor with high short circuit resistance according to claim 2, wherein: the lower armature (4) is of a long strip-shaped U-shaped groove structure which extends along the length direction of the movable contact (3) and has a U-shaped vertical section, and the lower armature (4) is wrapped outside the middle part of the movable contact (3) in an interference tight fit mode;

the two upper armatures (5) are all arc-shaped blocks, and the two upper armatures (5) are embedded on the top inner wall of the shielding shell (11) side by side and are just opposite to the position above the lower armature (4).

4. The direct current contactor with high short circuit resistance according to claim 1, wherein: the driving mechanism is provided with a coil (6) arranged at the lower part of an inner cavity of the shell (1), a rotor (7) movably arranged in a space enclosed by the coil (6) and a push rod (8) vertically arranged, the lower end of the push rod (8) is tightly inserted into the rotor (7), a contact spring (9) is sleeved on the upper end of the push rod (8) in a positioning mode, and the contact spring (9) is elastically abutted against the lower side of the lower armature (4) so as to apply upward elastic supporting force to the lower armature (4) and the moving contact (3).