CN216528651U - Repulsion-proof contact structure of DC contactor - Google Patents
Repulsion-proof contact structure of DC contactor Download PDFInfo
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- CN216528651U CN216528651U CN202122989708.2U CN202122989708U CN216528651U CN 216528651 U CN216528651 U CN 216528651U CN 202122989708 U CN202122989708 U CN 202122989708U CN 216528651 U CN216528651 U CN 216528651U
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Abstract
The utility model discloses a repulsion-proof contact structure of a direct current contactor, which comprises: the magnetic field generator comprises a movable contact piece and two static contacts positioned on one side of the movable contact piece, wherein first magnetizers are arranged on the two static contacts, second magnetizers are arranged on the movable contact piece in a manner of being opposite to the first magnetizers one by one, and the second magnetizers and the corresponding first magnetizers mutually generate suction under the action of a magnetic field formed when the movable contact piece is in contact conduction with the two static contacts. According to the repulsion-preventing contact structure of the direct current contactor, the first magnetizer is mounted on the static contact, the second magnetizer is mounted on the movable contact piece, and the movable contact piece is provided with compensation force through the suction force generated between the first magnetizer and the second magnetizer so as to overcome electric repulsion force and avoid the risk that the movable contact piece is repelled due to the influence of the electric repulsion force.
Description
Technical Field
The utility model relates to the technical field of direct current contactors, in particular to an anti-repulsion contact structure of a direct current contactor.
Background
The direct current contactor is an electromagnetic switch for controlling the on-off of large current through the on-off of small current, and is mainly used in the fields of electric automobiles, charging piles, photovoltaics, energy storage and the like. The working principle is as follows: when the coil of the contactor is electrified, the coil generates a magnetic field to drive the movable iron core to move upwards, the movable iron core drives the movable contact piece to move upwards synchronously through the push rod, and the movable contact piece is contacted with the static contact to realize conduction, so that the aim of controlling large current by small current is fulfilled.
At present, for contactor products with large specifications, the current flowing through a contact is large, especially when the short-circuit current passes through, electric repulsion force is generated between a movable contact piece and a static contact, and when the electric repulsion force is larger than the supporting force of the movable contact piece, the movable contact piece is repelled, a strong electric arc is generated, and the adhesion of the contactor or even the explosion is caused. In order to avoid the repulsion of the movable contact piece, the prior art generally adopts a mode that a lower armature is riveted on the movable contact piece and an upper armature is riveted on a push rod, so that under the action of a ring-shaped magnetic field generated by a current-conducting conductor, the lower armature is attracted by the upper armature, and meanwhile, an upward compensation force is provided for the movable contact piece to prevent the movable contact piece from being repelled; however, the upper armature is attracted by the lower armature while being attracted by the lower armature, the reaction force acts on the iron core through the push rod, and when the reaction force and the elastic force of the spring at the bottom of the movable contact piece are superposed and are greater than the holding force of the iron core, the iron core is repelled, so that the contactor fails. Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.
Disclosure of Invention
In order to solve the technical problem, the utility model provides an anti-repulsion contact structure of a direct current contactor, wherein a first magnetizer is installed on a static contact, a second magnetizer is installed on a movable contact piece, when the contactor is closed, an attractive force is generated between the first magnetizer and the second magnetizer, a large compensation force is provided for the movable contact piece so as to overcome an electric repulsion force, the risk that the movable contact piece is repelled is avoided, a reaction force cannot be generated for an iron core, and the defect that the iron core is repelled is effectively overcome.
The technical scheme adopted by the utility model for solving the technical problem is as follows: a direct current contactor repulsion-proof contact structure comprises: the magnetic field generator comprises a movable contact piece and two static contacts positioned on one side of the movable contact piece, wherein first magnetizers are arranged on the two static contacts, second magnetizers are arranged on the movable contact piece in a manner of being opposite to the first magnetizers one by one, and the second magnetizers and the corresponding first magnetizers mutually generate suction under the action of a magnetic field formed when the movable contact piece is in contact conduction with the two static contacts.
As a further improvement of the present invention, the stationary contact includes a contact main body and a contact portion integrally connected to the contact main body, the contact portion is bent with respect to the contact main body and is arranged parallel to the movable contact piece, and the first magnetizer is mounted on the contact portion.
As a further improvement of the present invention, the first magnetizer and the second magnetizer are both U-shaped, two side walls of the first magnetizer are wrapped at two side edges of the contact portion, two side walls of the second magnetizer are wrapped at two side edges of the movable contact piece, and two end portions of the first magnetizer are disposed opposite to two end portions of the second magnetizer.
As a further improvement of the present invention, the first magnetizer and the second magnetizer are both made of soft magnetic materials.
As a further improvement of the present invention, the first magnetizer and the second magnetizer are fixedly connected to the corresponding static contact and the corresponding movable contact piece by welding, riveting or interference fit.
The utility model has the beneficial effects that: the utility model provides a repulsion-preventing contact structure of a direct current contactor, wherein first magnetizers are arranged on two static contacts, two second magnetizers are arranged on a movable contact piece in a one-to-one manner relative to the first magnetizers, the first magnetizers and the second magnetizers are magnetized under the action of a spiral magnetic field generated when the movable contact piece and two static contacts are contacted and conducted with current, so that the second magnetizers and the corresponding first magnetizers generate attraction mutually, the movable contact piece has larger compensation force to overcome the electric repulsion force applied to the movable contact piece, the short-circuit resistance is improved, the risk that the movable contact piece is repelled due to the influence of the electric repulsion force is avoided, the reaction force of the second magnetizer applied to the first magnetizer only acts on the static contacts, the reaction force cannot be generated to an iron core, and the problem that the iron core is repelled is effectively solved.
Drawings
Fig. 1 is a perspective view of a repulsion preventing contact structure of a dc contactor according to the present invention.
The following description is made with reference to the accompanying drawings:
1-moving contact piece; 2-static contact;
201-contact body; 202-contact portion;
3-first magnetizer; 4-second magnetizer.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a repulsion-preventing contact structure of a dc contactor, including: the device comprises a movable contact piece 1 and two static contacts 2, wherein the two static contacts 2 are symmetrically arranged above the movable contact piece 1 and are respectively opposite to the tops of two ends of the movable contact piece 1. The movable contact piece 1 is connected with an electromagnetic driving mechanism in the direct current contactor, and is driven by the electromagnetic driving mechanism to move upwards to be in contact with the two fixed contacts 2, so that a working circuit loop of the direct current contactor is conducted. The two static contacts 2 are respectively provided with a first magnetizer 3, and the movable contact piece 1 is provided with two second magnetizers 4 which are opposite to the first magnetizer 3 one by one. When the movable contact piece 1 is in contact conduction with the two static contacts 2, a spiral magnetic field is generated when current flows through the movable contact piece 1 and the two static contacts 2, the first magnetizer 3 and the second magnetizer 4 are magnetized in the spiral magnetic field, so that the second magnetizer 4 and the corresponding first magnetizer 3 generate attraction force mutually, the movable contact piece 1 has large compensation force to overcome electric repulsion force applied to the movable contact piece 1, the short-circuit resistance is improved, the risk that the movable contact piece 1 is repelled due to the influence of the electric repulsion force is avoided, and the reaction force of the second magnetizer applied to the first magnetizer only acts on the static contacts, the reaction force cannot be generated on the iron core, and the problem that the iron core is repelled is effectively solved.
The static contacts 2 each include a contact main body 201 and a contact portion 202 integrally connected to the contact main body 201, the contact portion 202 is bent by 90 degrees with respect to the contact main body 201 and is arranged parallel to the movable contact piece 1, the first magnetizer 3 is installed on the contact portion 202, and when the dc contactor is in a closed state, the top surface of the movable contact piece 1 abuts against the bottom surface of the contact portion 202.
Specifically, the first magnetizer 3 and the second magnetizer 4 are both U-shaped structures, and the first magnetizer 3 and the corresponding second magnetizer 4 are arranged with openings facing each other. The first magnetizer 3 is fixedly connected to the top of the contact portion 202 of the static contact 2 in a welding, riveting or interference fit manner, and two side walls of the first magnetizer are wrapped on two side edges of the contact portion 202. The second magnetizer 4 is fixedly connected to the bottom of the movable contact piece 1 in a welding, riveting or interference fit mode, and two side walls of the second magnetizer are wrapped on two side edges of the movable contact piece 1. By adopting the structural design, the assembly is simple, and the stability and the reliability of the connection of all the parts are higher. Wherein, the U type both ends of first magnetizer 3 are just setting up to the U type both ends of second magnetizer 4, and under the effect of spiral magnetic field, the first magnetizer 3 of magnetization is different with the relative tip polarity of second magnetizer 4, and then produces suction each other, and adopts U type structural design, can make the magnetization effect better, and the suction of production is also stronger.
As a preferred embodiment, the two U-shaped end surfaces of the first magnetizer 3 are slightly higher than the bottom surface of the contact portion 202 of the static contact 2, and the two U-shaped end surfaces of the second magnetizer 4 are slightly lower than the top surface of the movable contact piece 1, so that a certain small gap is left between the second magnetizer 4 and the first magnetizer 3 when the movable contact piece 1 is contacted with the two static contacts 2, by adopting the structural design, under the condition that an overtravel distance capable of moving is provided between the movable contact piece 1 and the static contact 2, a larger suction force is provided between the first magnetizer 3 and the second magnetizer 4, and the risk that the contacts cannot be contacted due to abrasion between the movable contact piece 1 and the static contact 2 can be effectively avoided.
The first magnetizer 3 and the second magnetizer 4 are made of soft magnetic materials, such as electrician pure iron, cast iron, and the like, which is not limited herein in this embodiment, so as to realize magnetization and generate attraction force between each other.
Therefore, according to the repulsion-preventing contact structure of the direct current contactor, the first magnetizers are arranged on the two static contacts, the two second magnetizers are arranged on the movable contact piece in a one-to-one mode relative to the first magnetizers, the first magnetizers and the second magnetizers are magnetized under the action of a spiral magnetic field generated when the movable contact piece and the two static contacts are in contact and conducted with currents, so that the second magnetizers and the corresponding first magnetizers generate attraction force mutually, the movable contact piece has large compensation force to overcome electric repulsion force applied to the movable contact piece, short circuit resistance is improved, the risk that the movable contact piece is repelled due to the influence of the electric repulsion force is avoided, reaction force of the second magnetizers applied to the first magnetizers only acts on the static contacts, reaction force cannot be generated to an iron core, and the problem that the iron core is repelled is effectively solved.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the utility model, which can be embodied in many different forms than described herein, and therefore the utility model is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims (5)
1. A direct current contactor is prevented repelling and is opened contact structure which characterized in that includes: the magnetic circuit breaker comprises a movable contact piece (1) and two static contacts (2) located on one side of the movable contact piece (1), wherein first magnetizers (3) are installed on the two static contacts (2), second magnetizers (4) are installed on the movable contact piece (1) and face the first magnetizers (3) one by one, and the second magnetizers (4) and the corresponding first magnetizers (3) mutually generate suction under the action of magnetic fields formed when the movable contact piece (1) is in contact conduction with the two static contacts (2).
2. The direct current contactor repulsion preventing contact structure according to claim 1, characterized in that: the static contact (2) comprises a contact main body (201) and a contact part (202) integrally connected with the contact main body (201), the contact part (202) is bent relative to the contact main body (201) and arranged in parallel to the movable contact piece (1), and the first magnetizer (3) is installed on the contact part (202).
3. The direct current contactor repulsion preventing contact structure according to claim 2, characterized in that: the first magnetizer (3) and the second magnetizer (4) are both U-shaped structures, the two side walls of the first magnetizer (3) are wrapped on the two side edges of the contact part (202), the two side walls of the second magnetizer (4) are wrapped on the two side edges of the movable contact piece (1), and the two end parts of the first magnetizer (3) are just opposite to the two end parts of the second magnetizer (4).
4. The direct current contactor repulsion preventing contact structure according to claim 1, characterized in that: the first magnetizer (3) and the second magnetizer (4) are made of soft magnetic materials.
5. The direct current contactor repulsion preventing contact structure according to claim 1, characterized in that: the first magnetizer (3) and the second magnetizer (4) are fixedly connected with the corresponding static contact (2) and the corresponding movable contact piece (1) in a welding, riveting or interference fit mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122989708.2U CN216528651U (en) | 2021-12-01 | 2021-12-01 | Repulsion-proof contact structure of DC contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122989708.2U CN216528651U (en) | 2021-12-01 | 2021-12-01 | Repulsion-proof contact structure of DC contactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216528651U true CN216528651U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122989708.2U Active CN216528651U (en) | 2021-12-01 | 2021-12-01 | Repulsion-proof contact structure of DC contactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216528651U (en) |
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2021
- 2021-12-01 CN CN202122989708.2U patent/CN216528651U/en active Active
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