Direct current contactor

Abstract

The utility model discloses a direct current contactor, and relates to the technical field of direct current contactors, the direct current contactor comprises an upper shell and a lower shell, the upper shell and the lower shell form a mounting cavity, a coil is arranged in the mounting cavity, a movable rod coaxially slides in the coil, the movable rod is in sliding connection with the lower shell, and a conducting strip is fixed at one end, extending into the mounting cavity, of the movable rod. A plurality of conductive seats used for being connected with an external circuit are fixed outside the upper shell, the conductive seats extend into the installation cavity and are used for being matched with the conductive sheets for use, an arc extinguishing shell is installed in the installation cavity, the movable rod slides in the arc extinguishing shell, when the movable rod retracts, the conductive sheets can be contained in the arc extinguishing shell, and a microswitch is fixed on the outer side of the arc extinguishing shell. The microswitch is located in the installation cavity, and a trigger mechanism is arranged between the microswitch and the movable rod. According to the invention, the problem that the electrical safety is easily reduced because the auxiliary contact is arranged on the outer side of the arc extinguishing shell is solved.

Description

Technical Field

[0001] The present application relates to the technical field of DC contactors, and in particular to a DC contactor. Background Art

[0002] A DC contactor is a contactor whose core is controlled by a DC coil and is used in DC circuits. When the contactor coil is energized, the coil current generates a magnetic field, causing the static iron core to generate electromagnetic attraction, attracting the moving iron core, and driving the contacts: the normally closed contact opens, and the normally open contact closes, both of which are linked. When the coil is de-energized, the electromagnetic attraction disappears, and the armature is released by the release spring, restoring the contacts: the normally open contact opens, and the normally closed contact closes. Because the DC contactor's attraction coil is fed with DC, there is no inrush starting current and no violent core impact. Therefore, it has a long lifespan and is suitable for frequently connecting and disconnecting AC and DC main circuits and large-capacity control circuits.

[0003] In the related art, a Chinese utility model patent with publication number CN214226831U proposes a DC contactor with auxiliary contacts, including a DC contactor assembly and auxiliary contacts. The DC contactor assembly uses a bellows to seal the gap channel connected to the outside world, forming a sealed space inside. The auxiliary contacts are arranged outside the sealed space. The bellows can move with the movable shaft in the DC contactor assembly. When the bellows moves with the movable shaft, the movable shaft or the bellows can link the auxiliary contacts.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the auxiliary contacts are arranged outside the arc extinguishing shell of the DC contactor assembly, which lengthens the size of the entire device and restricts the installation to the component environment. In addition, the auxiliary contacts are exposed outside the arc extinguishing shell, which easily reduces electrical safety. Utility Model Content

[0005] In order to solve the problem that the size of the entire device is lengthened due to the auxiliary contacts being exposed outside the arc extinguishing shell, the installation is restricted by the component environment, and the electrical safety is easily reduced, the present application provides a DC contactor.

[0006] The DC contactor provided in this application adopts the following technical solution:

[0007] A DC contactor comprises an upper shell and a lower shell, wherein the upper shell and the lower shell form an installation cavity, a coil is installed in the installation cavity, a movable rod is coaxially sliding in the coil, the movable rod is slidably connected to the lower shell, a conductive sheet is fixed to one end of the movable rod extending into the installation cavity, a plurality of conductive seats for connecting to an external circuit are fixed to the outside of the upper shell, the conductive seats extend into the installation cavity for use with the conductive sheets, an arc extinguishing shell is installed in the installation cavity, the movable rod slides in the arc extinguishing shell, and when the movable rod retracts, the conductive sheet can be stored in the arc extinguishing shell, a micro switch is fixed to the outside of the arc extinguishing shell, the micro switch is located in the installation cavity, and a trigger mechanism is provided between the micro switch and the movable rod.

[0008] By adopting the above technical solution, when the main circuit of the DC contactor is powered off, the magnetic field disappears, the conductive sheet is disconnected from the conductive seat, the conductive sheet slides away from the conductive seat and retracts into the arc extinguishing shell, the movable rod also slides away from the conductive seat, the micro switch is triggered, and the auxiliary circuit is connected; when the main circuit of the DC contactor is powered on, the magnetic field attracts the conductive sheet to slide toward the conductive seat, the movable rod also slides toward the conductive seat, the micro switch is not triggered, and the auxiliary circuit is not connected; by arranging the micro switch of the auxiliary circuit in the installation cavity, the size of the entire DC contactor device is shortened, installation is more convenient, and the problem of reduced electrical safety is also solved.

[0009] Optionally, the trigger mechanism includes a mounting shell fixed on the outside of the arc-extinguishing shell and a protruding block fixed on the outside of the moving rod. The microswitch is mounted on the mounting shell, the protruding block is slidingly connected to the microswitch, and one end of the protruding block extending outside the arc-extinguishing shell abuts against the contact of the microswitch.

[0010] By adopting the above technical solution, when the movable rod slides away from the conductive seat, the protruding block also slides away from the conductive seat, and the protruding block contacts the micro switch, and the auxiliary circuit is connected at this time; when the movable rod slides toward the conductive seat, the protruding block also slides toward the conductive seat, and the protruding block separates from the contact of the micro switch, and the auxiliary circuit is not connected at this time; the protruding block slides and contacts the micro switch contact, and the micro switch is installed in the mounting shell, which can achieve a rapid response to the disconnection and connection of the auxiliary circuit.

[0011] Optionally, a bracket is provided inside the arc-extinguishing shell, a sliding groove is provided in the middle of the arc-extinguishing shell, the bracket slides in the sliding groove, an abutment block is provided on the outside of the movable rod, the abutment block abuts against the end of the bracket away from the conductive sheet, a spring is coaxially sleeved on the outside of the movable rod, the spring is provided in the arc-extinguishing shell, an inner groove is provided on the top of the bracket, one end of the spring abuts against the bottom of the conductive sheet, and the other end of the spring abuts against the inner groove.

[0012] By adopting the above technical solution, when the main circuit coil is de-energized, the movable rod slides away from the conductive seat under the action of gravity, and at the same time the spring also pushes the bracket to slide away from the conductive seat; when the main circuit coil is energized, the magnetic field attracts the conductive sheet to slide toward the conductive seat, and at the same time the spring and the bracket also slide toward the conductive seat; the spring can increase the sensitivity of the conductive sheet to separate and fit with the conductive seat.

[0013] Optionally, a connection groove is formed at one end of the conductive seat away from the conductive sheet, a conductive column is fixedly installed in the connection groove, and an outer side of the end of the conductive column away from the conductive seat is threaded.

[0014] By adopting the above technical solution, the threaded groove setting of the conductive column can increase the contact area between the conductive column and the wire, ensure a tight connection between the conductive column and the wire, reduce the risk of the wire sliding or falling off, and reduce the occurrence of electrical failures.

[0015] Optionally, a spring piece is fixed on the outer wall of the arc-extinguishing shell at one end away from the conductive sheet, and the end of the spring piece away from the arc-extinguishing shell abuts against the bottom wall of the inner cavity of the lower shell.

[0016] By adopting the above technical solution, the setting of the shrapnel can reduce the rebound and shaking caused by the movement of the moving rod, thereby ensuring the stability of the working environment of the arc extinguishing shell.

[0017] Optionally, the edge of the upper shell is arranged in an arc shape.

[0018] By adopting the above technical solution, the arc-shaped edge design of the upper shell reduces the safety problems caused by sharp edges, making the installation and maintenance of the DC contactor more convenient.

[0019] Optionally, a positioning groove is provided in the inner cavity of the upper shell, and a positioning flange is integrally formed on the outer side of the arc-extinguishing shell, and the positioning flange can abut against the positioning groove.

[0020] By adopting the above technical solution, the abutment between the positioning flange and the positioning groove can ensure that the cooperation between the two can be quickly and accurately aligned, while also increasing the stability of the connection and reducing the displacement of the arc extinguishing shell caused by external forces.

[0021] Optionally, a sealing ring is provided at the connection between the upper shell and the lower shell.

[0022] By adopting the above technical solution, the provision of the sealing ring can protect the DC contactor from air impurities, reduce the occurrence of electrical faults caused by air impurities, ensure the electrical performance of the DC contactor is stable, and ensure the normal operation of the DC contactor.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Placing the trigger mechanism of the auxiliary circuit in the sealed cavity of the DC contactor can solve the problem of the auxiliary contacts being exposed outside the arc extinguishing shell, which increases the size of the entire device, restricts the installation environment, and easily reduces electrical safety.

[0025] 2. When the movable rod slides away from the conductive seat, the raised block also slides away from the conductive seat, and the raised block contacts the micro switch, at which time the auxiliary circuit is connected; when the movable rod slides toward the conductive seat, the raised block also slides toward the conductive seat, and the raised block separates from the micro switch contact, at which time the auxiliary circuit is not connected; the raised block slides against the micro switch contact, and the micro switch is installed in the mounting shell, which can achieve a quick response to the disconnection and connection of the auxiliary circuit;

[0026] 3. The abutment between the positioning flange and the positioning groove can ensure that the two can be quickly and accurately aligned, while also increasing the stability of the connection and reducing the displacement of the arc extinguishing shell caused by external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the DC contactor according to an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the internal structure of the DC contactor according to an embodiment of the present application.

[0030] Figure 3 It is a schematic cross-sectional structure diagram of the DC contactor according to an embodiment of the present application.

[0031] Figure 4 It is a schematic diagram of the micro switch structure in the embodiment of the present application.

[0032] Figure 5 yes Figure 4 A local enlarged schematic diagram of point A in the middle.

[0033] Figure 6 It is a schematic diagram of the external structure of the moving rod in an embodiment of the present application.

[0034] Figure 7 It is a schematic diagram of the connection structure between the trigger mechanism and the spring in the embodiment of the present application.

[0035] Figure numerals: 1. upper shell; 2. lower shell; 3. mounting cavity; 4. coil; 5. moving rod; 6. conductive sheet; 7. conductive seat; 8. arc extinguishing shell; 9. micro switch; 10. trigger mechanism; 11. mounting shell; 12. protruding block; 13. contact; 14. bracket; 15. slide groove; 16. abutment block; 17. spring; 18. inner sink groove; 19. connecting groove; 20. conductive column; 21. spring; 22. positioning groove; 23. positioning flange; 24. sealing ring. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-7 This application is described in further detail.

[0037] The embodiment of the present application discloses a DC contactor. Figure 1 and Figure 2 The DC contactor includes an upper shell 1 and a lower shell 2, which form a mounting cavity 3. To ensure the internal sealing of the DC contactor, this embodiment provides a rubber sealing ring 24 at the junction of the upper shell 1 and the lower shell 2, thereby reducing the occurrence of electrical faults and ensuring the normal operation of the DC contactor. To reduce the safety issues caused by sharp edges, the edges of the upper shell 1 are arc-shaped in this embodiment, making it easier and safer to handle the DC contactor during installation and maintenance.

[0038] Reference Figure 2 Two conductive seats 7 are fixed on the outside of the upper shell 1. The two conductive seats 7 are cylindrical. A connecting groove 19 is opened on the end of the two conductive seats 7 away from the upper shell 1. A conductive column 20 is fixedly inserted into the connecting groove 19. The conductive column 20 is also cylindrical. The wire is installed on the outer surface of the conductive column 20 to achieve connection with the external circuit. The outer side of the conductive column 20 is threaded, which can increase the contact area between the conductive column 20 and the wire, ensure that the conductive column 20 is tightly connected to the wire, and reduce the occurrence of electrical faults.

[0039] Reference Figure 2 and Figure 3 The conductive seat 7 extends into the installation cavity 3 at one end away from the conductive column 20, and a conductive sheet 6 is provided inside the installation cavity 3. The conductive sheet 6 is used in conjunction with the conductive seat 7. A slide groove 15 is opened in the vertical direction in the middle of the installation cavity 3, and a movable rod 5 is installed in the slide groove 15. The conductive sheet 6 is fixedly installed at one end of the movable rod 5 close to the conductive seat 7. The movable rod 5 and the conductive sheet 6 slide in the vertical direction. When the main circuit is energized, the magnetic field attracts the conductive sheet 6 to slide toward the conductive seat 7. At this time, the movable rod 5 also approaches the conductive seat 7. When the main circuit is de-energized, the magnetic field disappears, and the conductive sheet 6 is separated from the conductive seat 7. At this time, the conductive sheet 6 and the movable rod 5 both slide away from the conductive seat 7.

[0040] Reference Figure 2 and Figure 3Because DC contactors generate a large amount of arcs at the moment of power failure, and the arcs are conductive and could potentially cause safety accidents, an arc-extinguishing shell 8 is installed in the mounting cavity 3 to achieve rapid arc extinguishing. To reduce the displacement of the arc-extinguishing shell 8 during the sliding movement of the movable rod 5, this embodiment has a positioning flange 23 integrally formed on the outer side of the arc-extinguishing shell 8, and a positioning groove 22 is also provided in the inner cavity of the upper shell 1. The abutment between the positioning flange 23 and the positioning groove 22 ensures that the two can be quickly and accurately aligned, which also increases the stability of the arc-extinguishing shell connection.

[0041] Reference Figure 2 and Figure 5 Since the prior art places the microswitch 9 outside the mounting cavity 3, which results in a decrease in electrical safety, in this embodiment, the microswitch 9 is placed inside the mounting cavity 3, and the mounting cavity 3 is fixedly mounted outside the arc extinguishing shell 8. This not only improves the electrical safety of the DC contactor, but also reduces the size of the entire DC contactor device, making installation more convenient, and also enabling a rapid response to disconnection and connection of the auxiliary circuit. A contact 13 is provided on the side of the microswitch 9 near the arc extinguishing shell 8. The contact 13 is a square metal sheet that is fixedly mounted at an angle. The contact 13 is mounted on the microswitch 9, and a protrusion 12 is fixedly mounted on the side of the bracket 14 near the microswitch 9. One end of the protrusion 12 extends outside the arc extinguishing shell 8, and the protrusion 12 contacts the contact 13 of the microswitch 9. When the protruding block 12 slides away from the conductive seat 7, the protruding block 12 contacts the contact 13 of the micro switch 9, and the auxiliary circuit is connected; when the protruding block 12 slides toward the conductive seat 7, the protruding block 12 disengages from the contact 13 of the micro switch 9, and the auxiliary circuit is not connected.

[0042] Reference Figure 3 and Figure 4 The arc-extinguishing housing 8 is provided with a bracket 14 in a square shape. The bracket 14 has an inner recess 18 at one end near the conductive sheet 6. An abutment block 16 is fixedly connected to the outside of the movable rod 5. The abutment block 16 abuts against the end of the bracket 14 away from the conductive sheet 6. In order to increase the sensitivity of the conductive sheet 6 and the conductive seat 7 when disengaging and engaging, this embodiment installs a spring 17 between the bracket 14 and the conductive sheet 6. The spring 17 is coaxially sleeved on the outside of the movable rod 5, with one end of the spring 17 abutting against the conductive sheet 6 and the other end abutting against the inner recess 18. The spring 17 and the bracket 14 both slide coaxially in the vertical direction. When the movable rod 5 slides toward the conductive seat 7, the spring 17 and the bracket 14 also slide toward the conductive seat 7. When the movable rod 5 slides away from the conductive seat 7 under the action of gravity, the spring 17 pushes the bracket 14 away from the conductive seat 7. The end of the bracket 14 away from the conductive sheet 6 abuts against the abutment block 16, and the sliding stops at this time.

[0043] Reference Figure 6 and Figure 7The movable rod 5 is slidably connected to the lower shell 2. The movable rod 5 will vibrate when sliding. In order to reduce the rebound and jitter caused by the movable rod 5 when sliding and ensure the stability of the working environment of the DC contactor, this embodiment has a spring 21 fixed on the outer wall of the arc extinguishing shell 8 away from the conductive sheet 6. The spring 21 is an elastic arc-shaped metal sheet, and the spring 21 abuts against the bottom wall of the inner cavity of the lower shell 2.

[0044] The implementation principle of a DC contactor in an embodiment of the present application is as follows: when the main circuit of the DC contactor is powered off, the electromagnetic attraction disappears, and the conductive sheet 6 is separated from the conductive seat 7 and slides away from the conductive seat 7. At the same time, the movable rod 5 also slides away from the conductive seat 7, and the spring 17 pushes the bracket 14 to slide away from the conductive seat 7. The protruding block 12 on the outside of the bracket 14 slides away from the conductive seat 7. At this time, the protruding block 12 just abuts against the contact 13 of the microswitch 9, the microswitch 9 is triggered, and the auxiliary circuit is also connected; when the main circuit of the DC contactor is energized, an electromagnetic attraction is generated to attract the conductive sheet 6 to slide toward the conductive seat 7, the movable rod 5 slides toward the conductive seat 7, the spring 17 and the bracket 14 also slide toward the conductive seat 7, and the protruding block 12 on the outside of the bracket 14 slides toward the conductive seat 7. At this time, the protruding block 12 is separated from the contact 13 of the microswitch 9, the microswitch 9 is not triggered, and the auxiliary circuit is not connected. The auxiliary circuit of the DC contactor is used for signal transmission to show whether the main circuit is running or stopped, ensuring that the DC contactor works safely in the DC circuit.

[0045] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A DC contactor, comprising an upper shell (1) and a lower shell (2), wherein the upper shell (1) and the lower shell (2) form a mounting cavity (3), wherein a coil (4) is mounted in the mounting cavity (3), wherein a movable rod (5) is coaxially slidably disposed in the coil (4), wherein the movable rod (5) is slidably connected to the lower shell (2), wherein one end of the movable rod (5) extending into the mounting cavity (3) is fixed with a conductive sheet (6), wherein a plurality of conductive seats (7) for connecting to an external circuit are fixed to the outside of the upper shell (1), wherein the conductive seats (7) extend into the mounting cavity (3) and are used in conjunction with the conductive sheet (6), wherein the conductive sheet (6) is used in conjunction with the conductive sheet (6), and wherein the conductive sheet (6) is provided with a plurality of conductive seats (7) for connecting to an external circuit. An arc extinguishing shell (8) is installed in the installation cavity (3), and the movable rod (5) slides in the arc extinguishing shell (8). When the movable rod (5) retracts, the conductive sheet (6) can be stored in the arc extinguishing shell (8). A micro switch (9) is fixed on the outside of the arc extinguishing shell (8), and the micro switch (9) is located in the installation cavity (3). A trigger mechanism (10) is provided between the micro switch (9) and the movable rod (5).

2. A DC contactor according to claim 1, characterized in that: The trigger mechanism (10) comprises a mounting shell (11) fixed to the outside of the arc extinguishing shell (8) and a protruding block (12) fixed to the outside of the movable rod (5); the micro switch (9) is mounted on the mounting shell (11); and one end of the protruding block (12) extending outside the arc extinguishing shell (8) abuts against a contact (13) of the micro switch (9).

3. A DC contactor according to claim 1, characterized in that: A bracket (14) is provided inside the arc extinguishing shell (8), a slide groove (15) is provided in the middle of the arc extinguishing shell (8), and the bracket (14) slides in the slide groove (15). A contact block (16) is provided on the outside of the movable rod (5), and the contact block (16) abuts against one end of the bracket (14) away from the conductive sheet (6). A spring (17) is coaxially sleeved on the outside of the movable rod (5), and the spring (17) is provided in the arc extinguishing shell (8). An inner groove (18) is provided on the top of the bracket (14), and one end of the spring (17) abuts against the bottom of the conductive sheet (6), and the other end of the spring (17) abuts against the inner groove (18).

4. A DC contactor according to claim 1, characterized in that: A connection groove (19) is provided at one end of the conductive seat (7) away from the conductive sheet (6), a conductive column (20) is fixedly installed in the connection groove (19), and the outer side of the end of the conductive column (20) away from the conductive seat (7) is threaded.

5. A DC contactor according to claim 1, characterized in that: A spring piece (21) is fixed on the outer wall of the arc-extinguishing shell (8) at one end away from the conductive sheet (6), and the end of the spring piece (21) away from the arc-extinguishing shell (8) abuts against the bottom wall of the inner cavity of the lower shell (2).

6. A DC contactor according to claim 1, characterized in that: The edge of the upper shell (1) is arranged in an arc shape.

7. A DC contactor according to claim 6, characterized in that: A positioning groove (22) is provided in the inner cavity of the upper shell (1), and a positioning flange (23) is integrally formed on the outer side of the arc-extinguishing shell (8), and the positioning flange (23) can abut against the positioning groove (22).

8. A DC contactor according to claim 7, characterized in that: A sealing ring (24) is provided at the connection between the upper shell (1) and the lower shell (2).

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