Direct current contactor

Abstract

The utility model provides a direct current contactor, comprising an insulating cover which is internally provided with a contact cavity, the contact cavity is internally provided with a static contact, and the upper end of the static contact passes through and exceeds the insulating cover; the first magnet and the second magnet are arranged in the insulating cover and symmetrically arranged on the two sides of the contact cavity, and a magnetic field covering the contact cavity can be generated between the first magnet and the second magnet; the shell assembly is connected to the lower end of the insulating cover, the shell assembly comprises a cylinder body, a coil layer and a magnetic conduction cylinder which are sequentially arranged from outside to inside, a driving assembly is arranged at the upper end of the magnetic conduction cylinder in a penetrating mode, and a moving contact is arranged at the upper end of the driving assembly; when the coil layer is in a power-on or power-off state, the moving contact is in contact with or separated from the lower end of the static contact through the driving assembly, and the magnetic field is used for lengthening and extinguishing an electric arc generated between the moving contact and the static contact. According to the utility model, the problems that the use is affected and the utilization rate is low due to the fact that an existing direct-current contactor is easy to generate electric arcs can be solved.

Description

Technical Field

[0001] The utility model belongs to the field of contactors, and more specifically, relates to a DC contactor. Background Art

[0002] DC contactor is a power control device, which is widely used in power system, automation control system, communication equipment and power electronics. Its function is to realize switch control in DC circuit, so as to realize the control of circuit current. With the wide application of DC contactor, the performance requirements for DC contactor are getting higher and higher.

[0003] When the DC contactor is in use, the driving component is set in the coil layer, and the magnetic field generated after the coil layer is energized is used to drive the driving component to move up and down, so that the driving component can drive the moving contact to contact the static contact set at the upper end of the DC contactor to achieve the conduction of the DC circuit. When the DC contactor is in use, an arc will be generated when the moving contact and the static contact are separated. The arc burning will generate a temperature of thousands of degrees. If the arc is not extinguished in time, it is easy to cause damage to the moving contact and the static contact and other components or even scrap, affecting the normal use of the DC contactor.

[0004] However, the existing DC contactors lack corresponding arc extinguishing measures, and it is difficult to ensure the long-term use of the DC contactors. As a result, the existing DC contactors have great limitations when used, and the utilization rate is low, and further improvement is still needed. Utility Model Content

[0005] The utility model aims to solve the problem that the existing DC contactor is easy to generate arc, which affects the use and has low utilization rate.

[0006] In order to achieve the above object, the utility model provides a DC contactor, comprising:

[0007] An insulating cover having a contact cavity therein, wherein a static contact is arranged in the contact cavity, and an upper end of the static contact penetrates through and exceeds the insulating cover;

[0008] A first magnet and a second magnet are disposed in the insulating cover and symmetrically arranged on both sides of the contact cavity, and a magnetic field covering the contact cavity can be generated between the two;

[0009] A housing assembly is connected to the lower end of the insulating cover, the housing assembly comprises a cylinder, a coil layer and a magnetic conductive cylinder which are sequentially arranged from the outside to the inside, a driving assembly is penetrated through the upper end of the magnetic conductive cylinder, and a moving contact is arranged at the upper end of the driving assembly;

[0010] When the coil layer is in an energized or de-energized state, the moving contact contacts or separates from the lower end of the stationary contact through the driving assembly, and the magnetic field is used to lengthen and extinguish the arc generated between the moving contact and the stationary contact.

[0011] Optionally, a first connecting portion for connecting the insulating cover and the cylinder is provided on the insulating cover.

[0012] Optionally, a second connecting portion for connecting the insulating cover and the cylinder is provided on the cylinder.

[0013] Optionally, the first connection portion and the second connection portion are respectively a plurality of protrusions and a plurality of mounting grooves corresponding to the number of the plurality of protrusions.

[0014] Optionally, the static contact includes a first static terminal and a second static terminal that are symmetrically arranged, and the first static terminal and the second static terminal are respectively used to electrically connect to two ends of the DC circuit.

[0015] Optionally, the upper end of the insulating cover is connected to a control terminal lead-out piece for supplying power to and controlling the coil layer.

[0016] Optionally, the gap between the first connecting part and the second connecting part, the gap between the first static terminal and the second static terminal and the insulating cover, and the gap between the control end lead-out piece and the insulating cover are all sealed by glue potting.

[0017] Optionally, the driving assembly includes an iron core and a push rod, the iron core is embedded in the magnetic cylinder and has a travel gap with the upper end of the magnetic cylinder, the lower end of the push rod is arranged in the iron core, and the upper end of the push rod extends into the contact cavity for connecting the moving contact.

[0018] Optionally, a first mounting seat for connecting the moving contact is provided at the upper end of the push rod.

[0019] Optionally, a buffer spring for buffering the movement of the moving contact is provided at the lower end of the first mounting seat.

[0020] The beneficial effects of the utility model are:

[0021] The DC contactor proposed by the utility model symmetrically arranges the first magnet and the second magnet on both sides of the contact cavity in the insulating cover, so that the magnetic field generated between the first magnet and the second magnet can cover the contact cavity, that is, cover the gap between the moving contact and the static contact, thereby lengthening and extinguishing the arc generated between the static contact and the moving contact. Compared with the existing DC contactor, the first magnet and the second magnet of the DC contactor of the utility model can protect the static contact and the moving contact and other components, thereby extending the service life of the DC contactor and improving its utilization rate.

[0022] According to the above content, the utility model can effectively solve the problem that the existing DC contactor is easy to generate arc, which leads to the problem of poor use and low utilization rate.

[0023] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to represent the same or similar components.

[0025] Figure 1 A cross-sectional view of a DC contactor according to an embodiment of the utility model is shown;

[0026] Figure 2 A schematic structural diagram of a DC contactor according to an embodiment of the utility model is shown;

[0027] Figure 3 A structural schematic diagram according to a specific embodiment of the utility model is shown.

[0028] Reference numerals:

[0029] 1-Insulation cover;

[0030] 2-Contact cavity;

[0031] 3- first magnet;

[0032] 4- second magnet;

[0033] 5-Cylinder;

[0034] 6- coil layer;

[0035] 7-magnetic cylinder;

[0036] 8-moving contact;

[0037] 9- first static terminal;

[0038] 10- second static terminal;

[0039] 11- control terminal lead-out sheet;

[0040] 12- convex;

[0041] 13-Mounting slot;

[0042] 14- groove;

[0043] 15- iron core;

[0044] 16- push rod;

[0045] 17- first mounting seat;

[0046] 18- second mounting seat;

[0047] 19-Yoke iron plate. DETAILED DESCRIPTION

[0048] In order to enable technicians in the relevant technical field to more fully understand the technical solution of the utility model, the exemplary implementation of the utility model will be described in more comprehensive and detailed in conjunction with the accompanying drawings below. Obviously, the one or more implementations of the utility model described below are only one or more of the specific ways to implement the technical solution of the utility model, and are not exhaustive. It should be understood that other ways belonging to a general utility model concept can be used to implement the technical solution of the utility model, and should not be limited by the exemplary description of the implementation. Based on one or more implementations of the utility model, all other implementations obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the utility model.

[0049] Example: Figure 1 A cross-sectional view of a DC contactor according to an embodiment of the utility model is shown;

[0050] Figure 2 A schematic structural diagram of a DC contactor according to an embodiment of the utility model is shown; Figure 3 A structural schematic diagram according to a specific embodiment of the utility model is shown.

[0051] Reference Figure 1-3 , an embodiment of the utility model provides a DC contactor, comprising:

[0052] An insulating cover 1 has a contact cavity 2 inside, a static contact is arranged in the contact cavity 2, and the upper end of the static contact passes through and exceeds the insulating cover 1;

[0053] The first magnet 3 and the second magnet 4 are disposed in the insulating cover 1 and symmetrically arranged on both sides of the contact cavity 2, and a magnetic field covering the contact cavity 2 can be generated between the two.

[0054] The housing assembly is connected to the lower end of the insulating cover 1. The housing assembly includes a cylinder 5, a coil layer 6 and a magnetic cylinder 7 which are arranged in sequence from the outside to the inside. The upper end of the magnetic cylinder 7 is penetrated by a driving assembly, and the upper end of the driving assembly is provided with a moving contact 8;

[0055] When the coil layer 6 is in an energized or de-energized state, the moving contact 8 contacts or separates from the lower end of the stationary contact through the driving assembly, and the magnetic field is used to lengthen and extinguish the arc generated between the moving contact 8 and the stationary contact.

[0056] In a specific embodiment, the first magnet 3 and the second magnet 4 are both permanent magnets. Specifically, an arc is generated when the static contact and the moving contact are separated, and at this time the DC contactor is still in a powered state. The permanent magnet will generate a magnetic field, enter the constituent material of the arc, accelerate the migration speed of the arc, and extinguish the arc in a shorter time, thereby effectively reducing the arc extinguishing time. At the same time, the permanent magnet can consume part of the arc energy, convert it into heat energy and sound energy, reduce the impact of the arc on components such as the static contact and the moving contact, and thus extend the service life of the DC contactor.

[0057] In a specific embodiment, the magnetic tube 7 is a cylindrical structure made of iron material. Specifically, the iron magnetic tube can guide the magnetic flux lines of the magnetic field generated by the coil layer after power is supplied upward, so that the iron core has sufficient power when moving upward, ensuring good contact between the moving contact and the static contact.

[0058] In one embodiment, the static contact includes a first static terminal 9 and a second static terminal 10 which are symmetrically arranged. The first static terminal 9 and the second static terminal 10 are respectively used to electrically connect to two ends of the DC circuit.

[0059] In one embodiment, the upper end of the insulating cover 1 is connected to a control terminal lead-out piece 11 for supplying power to and controlling the coil layer 6 .

[0060] In one embodiment, a first connecting portion for connecting the insulating cover 1 and the cylinder 5 is provided on the insulating cover 1 .

[0061] In one embodiment, a second connecting portion for connecting the insulating cover 1 and the cylinder 5 is provided on the cylinder 5 .

[0062] In a specific embodiment, the first connection portion and the second connection portion are respectively a plurality of protrusions 12 and a plurality of mounting grooves 13 corresponding to the number of the protrusions 12 .

[0063] In a specific embodiment, each of the plurality of mounting grooves 13 has an L-shaped structure. Specifically, when the lower end portion of the insulating cover is embedded in the cylinder, the protrusion is placed at one end of the mounting groove, and then the insulating cover is rotated along the extension direction of the mounting groove, so that the protrusion is tightly combined with the mounting groove, thereby realizing the screw connection between the insulating cover and the cylinder.

[0064] In one embodiment, the gap between the first connection part and the second connection part, the gap between the first static terminal 9 and the second static terminal 10 and the insulating cover 1, and the gap between the control terminal lead-out piece 11 and the insulating cover 1 are all sealed by glue pouring. Specifically, the glue pouring and sealing method is to apply epoxy glue at the above three gaps, and then cure the epoxy glue by baking, so as to achieve the sealing of the DC contactor by local glue pouring. This method can ensure the uniform and controllable amount of glue pouring, and can increase the contact area between the poured epoxy glue and each structure at the gap, increase the sealing strength at the gap, and achieve a better sealing effect.

[0065] In one embodiment, the insulating cover 1 is further provided with a groove 14. The groove can increase the contact area between the epoxy glue and the insulating cover to improve the strength of the glue-filled connection between the insulating cover and the cylinder.

[0066] In one embodiment, the driving assembly includes an iron core 15 and a push rod 16. The iron core 15 is embedded in the magnetic cylinder 7 and has a travel gap with the upper end of the magnetic cylinder 7. The lower end of the push rod 16 is arranged in the iron core 15, and the upper end thereof extends into the contact cavity 2 for connecting the moving contact 8.

[0067] In one embodiment, a reset spring is sleeved on the push rod 16 in the iron core 15 to drive the push rod 16 to reset.

[0068] In one embodiment, the upper end of the push rod 16 is provided with a first mounting seat 17 for connecting the moving contact 8. Specifically, the moving contact is sleeved on the lower end of the first mounting seat and can move with the first mounting seat.

[0069] In one embodiment, a buffer spring for buffering the movement of the moving contact 8 is disposed at the lower end of the first mounting seat 17 .

[0070] In one embodiment, a second mounting seat 18 is further provided on the push rod 16 , and the upper and lower ends of the buffer spring are connected to the first mounting seat 17 and the second mounting seat 18 respectively.

[0071] Specifically, the first mounting seat, the buffer spring and the second mounting seat can isolate the moving contact from the push rod, thereby effectively preventing voltage breakdown and ensuring normal use of the moving contact and the push rod.

[0072] In one embodiment, the coil layer 4 is provided with a yoke iron plate 19 for enclosing the magnetic field generated by the coil layer 6 in the cylinder 5, so as to enhance the attraction of the magnetic field and improve the operating efficiency of the iron core.

[0073] When the DC contactor of the utility model is in operation, after the coil layer is energized, the coil layer will generate a magnetic field covering the magnetic conductive cylinder and the iron core, causing the iron core to move upward under the influence of the magnetic force. At the same time, the magnetic conductive cylinder will also conduct the magnetic lines of force of the magnetic field upward as the iron core moves, so as to provide sufficient power for the iron core, so that the push rod can move upward with the iron core, so that the moving contact can contact the first static terminal post and the second static contact terminal post, thereby realizing the conduction of the DC circuit.

[0074] During this process, the buffer spring will buffer the movement of the moving contact, making its contact with the first static terminal and the second static terminal more stable. When the coil layer is powered off, the iron core and the push rod move downward. At this time, the reset spring can accelerate the reset of the push rod, so that the moving contact can be quickly separated from the first static terminal and the second static terminal.

[0075] The DC contactor proposed in the utility model symmetrically arranges the first magnet and the second magnet on both sides of the contact cavity in the insulating cover, so that the magnetic field generated between the first magnet and the second magnet can cover the contact cavity, that is, cover the gap between the moving contact and the static contact, thereby lengthening and extinguishing the arc generated between the static contact and the moving contact.

[0076] Furthermore, by arranging a magnetic conductive cylinder in the coil layer, the magnetic conductive cylinder can guide the movement of the driving assembly to avoid direct contact between the driving assembly and the coil layer, thereby reducing the influence of deformation of the coil layer on the driving assembly to ensure normal movement of the driving assembly.

[0077] Furthermore, by using glue to seal the gap between the first connecting part and the second connecting part, the gap between the first static terminal and the second static terminal and the insulating cover, and the gap between the control end lead-out piece and the insulating cover, the DC contactor can be sealed by local glue filling. This method can ensure that the amount of glue filling is uniform and controllable, and the contact area between the poured epoxy glue and the various structures at the gap can be increased by setting the groove, thereby increasing the sealing strength at the gap and achieving a better sealing effect.

[0078] Compared with the existing DC contactor, the invention can protect components such as the static contact and the moving contact, thereby prolonging the service life of the DC contactor and improving its utilization rate.

[0079] Although one or more embodiments of the utility model are described above, it should be known to those skilled in the art that the utility model can be implemented in any other form without departing from its subject matter and scope. Therefore, the embodiments described above are illustrative rather than restrictive, and many modifications and substitutions are obvious to those skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A DC contactor, characterized in that: include: An insulating cover having a contact cavity therein, wherein a static contact is arranged in the contact cavity, and an upper end of the static contact penetrates through and exceeds the insulating cover; A first magnet and a second magnet are disposed in the insulating cover and symmetrically arranged on both sides of the contact cavity, and a magnetic field covering the contact cavity can be generated between the two; A housing assembly is connected to the lower end of the insulating cover, the housing assembly comprises a cylinder, a coil layer and a magnetic conductive cylinder which are sequentially arranged from the outside to the inside, a driving assembly is penetrated through the upper end of the magnetic conductive cylinder, and a moving contact is arranged at the upper end of the driving assembly; When the coil layer is in an energized or de-energized state, the moving contact contacts or separates from the lower end of the stationary contact through the driving assembly, and the magnetic field is used to lengthen and extinguish the arc generated between the moving contact and the stationary contact.

2. The DC contactor according to claim 1, characterized in that: The insulating cover is provided with a first connecting portion for connecting the insulating cover and the cylinder.

3. The DC contactor according to claim 2, characterized in that: The cylinder is provided with a second connecting portion for connecting the insulating cover and the cylinder.

4. The DC contactor according to claim 3, characterized in that: The first connection portion and the second connection portion are respectively a plurality of protrusions and a plurality of mounting grooves corresponding to the number of the plurality of protrusions.

5. The DC contactor according to claim 3, characterized in that: The static contact comprises a first static terminal and a second static terminal which are symmetrically arranged, and the upper ends of the first static terminal and the second static terminal are respectively used to be electrically connected to two ends of a DC circuit.

6. The DC contactor according to claim 5, characterized in that: The upper end of the insulating cover is connected with a control terminal lead-out piece for supplying power to and controlling the coil layer.

7. The DC contactor according to claim 6, characterized in that: The gap between the first connecting part and the second connecting part, the gap between the first static terminal, the second static terminal and the insulating cover, and the gap between the control terminal lead-out piece and the insulating cover are all sealed by glue potting.

8. The DC contactor according to claim 1, characterized in that: The driving assembly includes an iron core and a push rod. The iron core is embedded in the magnetic cylinder and has a travel gap with the upper end of the magnetic cylinder. The lower end of the push rod is arranged in the iron core, and the upper end of the push rod extends into the contact cavity for connecting the moving contact.

9. The DC contactor according to claim 8, characterized in that: The upper end of the push rod is provided with a first mounting seat for connecting the moving contact.

10. The DC contactor according to claim 9, characterized in that: A buffer spring for buffering the movement of the moving contact is arranged at the lower end of the first mounting seat.

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