Direct current contactor

Abstract

The utility model relates to the technical field of contactors, in particular to a direct current contactor. The switch comprises a shell, two static contacts installed on the shell, a movable contact piece and a driving mechanism, and the driving mechanism comprises a static iron core installed on the shell, a movable iron core capable of being in linkage with the movable contact piece and a coil arranged on the periphery of the static iron core and the periphery of the movable iron core. A first reset mechanism which enables the movable iron core to drive the movable contact piece to be separated from the static contact after the coil is powered off is arranged on one side, close to the static iron core, of the movable iron core, a permanent magnet is arranged on one side, away from the static iron core, of the movable iron core, one end of the permanent magnet is detachably installed on the shell, and the other end of the permanent magnet is close to the movable iron core; according to the utility model, after the prior art is improved, through the second reset mechanism, after the coil is powered off, the movable iron core can be quickly reset, the separation of the movable contact piece and the static contact is accelerated, and the phenomena of electric arc and contact adhesion are avoided, so that the direct current contactor is longer in service life and safer.

Description

Technical Field

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

[0002] Contactors are important power control components used to control the start and stop of motors and the on and off of other electrical loads. They are widely used in industrial and agricultural electrification and automation as well as other economic construction fields. They are used in large quantities and have long working hours. With the popularization and improvement of electrification and automation technology, the use of contactors is growing very rapidly.

[0003] For example, a Chinese patent document with the authorization number CN208985929U discloses a DC contactor, including a shell, two static contacts, a moving contact piece and a driving mechanism. A transverse partition is positioned and installed in the inner cavity of the shell, and the transverse partition divides the inner cavity of the shell into an upper chamber and a lower chamber, and a static iron core is also positioned and installed on the transverse partition; the two static contacts are arranged side by side in the upper chamber, and the moving contact piece is also arranged in the upper chamber, and is also arranged vertically opposite to the two static contacts; the driving mechanism has a coil, a moving iron core, and a moving iron core. Core, push rod and return spring, the return spring is sleeved on the outside of the lower part of the push rod; in the above technical scheme, when the coil is powered on and off, the static iron core and the moving iron core will repeatedly squeeze the return spring. After working for a long time, the return spring will gradually fatigue and cause the elastic force to weaken, resulting in the static iron core and the moving iron core cannot be separated quickly after the coil is powered off, which can easily cause electric arcs to burn the contacts and other components near the contacts, and may cause contact adhesion, resulting in machine loss of control, and even mechanical accidents and personal injury accidents.

[0004] Therefore, it is necessary to improve the deficiencies in the above prior art. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a DC contactor in view of the deficiencies of the above-mentioned prior art, so as to solve the problem in the prior art that the reset spring gradually fatigues after working for a long time, resulting in weakened elastic force and failure to quickly separate the static iron core and the moving iron core, which easily leads to arc generation and contact adhesion.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a DC contactor, comprising a shell, two static contacts installed on the shell, a moving contact piece and a driving mechanism, wherein the driving mechanism comprises a static iron core installed on the shell, a moving iron core capable of being linked with the moving contact piece, and a coil arranged on the periphery of the static iron core and the moving iron core, a first reset mechanism is provided on the side of the moving iron core close to the static iron core, which enables the moving iron core to drive the moving contact piece to separate from the static contact after the coil is powered off, a permanent magnet is provided on the side of the moving iron core away from the static iron core, one end of the permanent magnet is detachably mounted on the shell, and the other end is close to the moving iron core.

[0007] By adopting the above technical solution, when the coil is energized, the coil generates a magnetic field to magnetize the static iron core and the moving iron core. The close ends of the static iron core and the moving iron core attract each other and make the moving iron core approach the static iron core. The moving iron core drives the moving contact piece close to the static contact until they abut against each other, and the DC contactor is connected; when the coil is de-energized, the magnetic field around the coil disappears, and the static iron core and the moving iron core no longer attract each other. The magnetic attraction of the permanent magnet on the moving iron core can provide a continuous force to keep the moving iron core away from the static iron core. Combined with the force of the first reset mechanism on the moving iron core, the moving iron core can be accelerated to move in the direction away from the static iron core, which can accelerate the separation of the moving contact piece from the static contact and disconnect the DC contactor, thereby avoiding the generation of arcs and contact sticking, thereby making the DC contactor have a longer service life and be safer.

[0008] The above technical solution is further configured as follows: a locking washer is provided on the outer periphery of the permanent magnet, a locking pin hole is provided on the end of the permanent magnet away from the moving iron core, a locking latch is connected with a transition fit in the locking pin hole, the locking latch abuts against the end face of the locking washer away from the moving iron core, an installation cavity is provided on the shell, the locking washer is interference fit with the inner side wall of the installation cavity, an arc groove adapted to the locking latch is provided at the bottom of the installation cavity, and the locking latch is clamped between the arc groove and the locking washer.

[0009] By adopting the above technical solution, when installing the permanent magnet, first insert the locking pin into the locking pin hole, then put the permanent magnet and the locking pin into the installation cavity together and make the locking pin fit into the arc groove, and then press the locking washer into the installation cavity until the locking washer abuts against the locking pin. The permanent magnet is axially fixed relative to the shell through the friction between the side of the locking washer and the inner wall of the installation cavity. When the permanent magnet needs to be replaced, the locking washer can be removed.

[0010] The above technical solution is further configured as follows: a magnetic ring is sleeved on the outer periphery of the coil, an insulating coil frame is wrapped inside the coil, an iron core through hole is provided in the center of the coil frame, one end of the iron core through hole is transitionally matched with the static iron core, and the other end is gap-matched with the moving iron core, the first reset mechanism includes a baffle and an insulating plate, a reset spring, and an insulating gasket located between the moving contact piece and the reset spring, which are sequentially sleeved on the coil frame, the moving contact piece and the insulating gasket are both axially limitedly sleeved on the moving iron core, one end of the reset spring is abutted against the insulating plate, and the other end is abutted against the insulating gasket.

[0011] By adopting the above technical solution, when the coil is energized, the moving iron core moves toward the static iron core, driving the moving contact piece and the insulating gasket to squeeze the reset spring until the moving contact piece abuts against the static contact point; when the coil is de-energized, the elastic force of the reset spring acts on the insulating gasket, driving the moving iron core to reset, so that the moving contact piece is separated from the static contact point.

[0012] The above technical solution is further configured as follows: the movable contact piece is gap-matched with one end of the movable iron core close to the permanent magnet; the movable iron core close to the permanent magnet is also sequentially sleeved with an insulating sleeve, a pressure spring, a spring seat and a guide plate that abut against the movable contact piece; one end of the pressure spring abuts against the insulating sleeve and the other end abuts against the spring seat; the spring seat abuts against the guide plate; the movable iron core is also provided with a limiting ring groove that cooperates with the through hole in the center of the guide plate for axial limiting; the guide plate is gap-matched with the side wall of the shell.

[0013] By adopting the above technical solution, when the coil is energized and the current is large, after the moving contact piece abuts against the static contact, the pressure spring can be further squeezed, so that the moving contact piece and the static contact abut against each other more tightly; the clearance between the guide plate and the side wall of the shell can limit the moving iron core, avoid excessive swinging range, and improve stability.

[0014] The above technical solution is further configured as follows: a limit slot is provided at one end of the static iron core away from the moving iron core, a limit through hole matching the limit slot is provided on the shell, a limit bottom plate is also sleeved on the outer periphery of the static iron core, one end of the coil is abutted against the limit bottom plate, and the other end is abutted against the baffle.

[0015] By adopting the above technical solution, the static iron core is axially fixed relative to the shell by inserting the limiting slot of the static iron core into the limiting through hole on the shell; the limiting bottom plate and the baffle limit the two ends of the coil to restrict it to the coil frame.

[0016] The above technical solution is further configured as follows: the shell is divided into a first shell and a second shell, the first shell and the second shell are detachably connected, a mounting bracket is provided on the first shell, positioning protrusions are provided at both ends of the mounting bracket facing the first shell, a positioning groove is provided on the first shell that is adapted to the positioning protrusion, a connecting hole is also provided on the mounting bracket that is inserted into the limiting slot, mounting holes are also provided at both ends of the mounting bracket, and the mounting cavity is located on the second shell.

[0017] By adopting the above technical solution, the shell is split into a first shell and a second shell, which can facilitate the disassembly and maintenance of parts. The connecting hole on the mounting bracket can be inserted into the limit slot without falling off. At the same time, the positioning protrusion cooperates with the positioning groove to prevent the mounting bracket from rotating, making it convenient to install the DC contactor on other equipment through the mounting hole.

[0018] The above technical solution is further configured as follows: the two static contacts are mounted on the side surface of the first shell, and two energized contacts electrically connected to the coil are also mounted on the side surface of the first shell.

[0019] By adopting the above technical solution, the on and off of the DC controller is controlled by connecting the two energized contacts to an external device.

[0020] The beneficial effect achieved by the utility model is that after the coil is powered off, the moving iron core can be quickly reset through the second reset mechanism, the separation of the moving contact piece and the static contact is accelerated, arcing and contact adhesion are avoided, and the service life of the DC contactor is longer and safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0022] Figure 2 It is a cross-sectional view in an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the explosion structure in the embodiment of the utility model;

[0024] Figure 4 yes Figure 3 Partial view at point A in the middle;

[0025] Figure 5 yes Figure 3 Partial view at point B in the middle;

[0026] Figure 6 yes Figure 3 Partial view at center C;

[0027] Figure 7 It is a structural schematic diagram of the moving iron core in the embodiment of the utility model;

[0028] Figure 8 This is a schematic diagram of the internal structure of the first housing in an embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the internal structure of the second shell in the embodiment of the utility model.

[0030] The following are the descriptions of the reference numerals:

[0031] 1. housing; 10. mounting cavity; 100. arc groove; 11. first housing; 110. Limiting through hole; 111. Positioning groove; 12. Second shell; 13. Mounting bracket; 130. Mounting hole; 131. Positioning protrusion; 132. Connecting hole; 2. Static contact; 3. Moving contact piece; 4. Driving mechanism; 41. Static iron core; 410. Limiting slot; 42. Moving iron core; 420. Limiting ring groove; 43. Coil; 430. Magnetic ring; 44. Coil skeleton; 440. Iron core through hole; 5. First reset mechanism; 51. Baffle; 52. Insulating plate; 53. Reset spring; 54. Insulating washer; 55. Insulating sleeve; 56. Pressure spring; 57. Spring seat; 58. Guide plate; 59. Limiting bottom plate; 6. Permanent magnet; 60. Locking pin hole; 7. Locking washer; 8. Locking pin; 9. Power-on contact. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-9 As shown in, a DC contactor includes a housing 1, two static contacts 2 mounted on the housing 1, a moving contact piece 3 and a driving mechanism 4, wherein the driving mechanism 4 includes a static iron core 41 mounted on the housing 1, a moving iron core 42 capable of being linked with the moving contact piece 3, and a coil 43 arranged on the periphery of the static iron core 41 and the moving iron core 42, a first reset mechanism 5 is provided on the side of the moving iron core 42 close to the static iron core 41, which causes the moving iron core 42 to drive the moving contact piece 3 to separate from the static contact 2 after the coil 43 is powered off, a permanent magnet 6 is provided on the side of the moving iron core 42 away from the static iron core 41, one end of the permanent magnet 6 is detachably connected to the housing 1, and the other end is close to the moving iron core 4 2. A locking washer 7 is sleeved around the outer periphery of the permanent magnet 6. A locking pin hole 60 is provided at one end of the permanent magnet 6 away from the moving iron core 42. A locking latch 8 is connected in a transition fit in the locking pin hole 60. The locking latch 8 abuts against the end face of the locking washer 7 away from the moving iron core 42. A mounting cavity 10 is provided on the housing 1. The locking washer 7 is interference fit with the inner side wall of the mounting cavity 10. An arc groove 100 adapted to the locking latch 8 is provided at the bottom of the mounting cavity 10. The locking latch 8 is clamped between the arc groove 100 and the locking washer 7. The magnetic attraction of the permanent magnet 7 to the moving iron core 42 can provide a continuous force to keep the moving iron core 42 away from the static iron core 41.

[0034] A magnetic ring 430 is sleeved on the outer periphery of the coil 43, an insulating coil skeleton 44 is wrapped inside the coil 43, an iron core through hole 440 is arranged in the center of the coil skeleton 44, one end of the iron core through hole 440 is transitionally matched with the static iron core 41, and the other end is gap-matched with the moving iron core 42, the first reset mechanism 5 includes a baffle 51 and an insulating plate 52, a reset spring 53, and an insulating gasket 54 located between the moving contact piece 3 and the reset spring 53, which are sequentially sleeved on the coil skeleton 44, the moving contact piece 3 and the insulating gasket 54 are both axially limitedly sleeved on the moving iron core 42, one end of the reset spring 53 is abutted against the insulating plate 52, and the other end is abutted against the insulating gasket 54.

[0035] The moving contact piece 3 is gap-matched with one end of the moving iron core 42 close to the permanent magnet 6. The moving iron core 42 close to the permanent magnet 6 is also sequentially sleeved with an insulating sleeve 55, a pressure spring 56, a spring seat 57 and a guide plate 58 that abut against the moving contact piece 3. One end of the pressure spring 56 abuts against the insulating sleeve 55, and the other end abuts against the spring seat 57. The spring seat 57 abuts against the guide plate 58. The moving iron core 42 is also provided with a limiting ring groove 420 for axial limiting that cooperates with the through hole in the center of the guide plate 58. The guide plate 58 is gap-matched with the side wall of the housing 1.

[0036] A limiting slot 410 is provided at one end of the static iron core 41 away from the moving iron core 42, and a limiting through hole 110 cooperating with the limiting slot 410 is provided on the first shell 11. A limiting bottom plate 59 is also sleeved on the outer periphery of the static iron core 41, and one end of the coil 43 abuts against the limiting bottom plate 59 and the other end abuts against the baffle 51.

[0037] The shell 1 is divided into a first shell 11 and a second shell 12, which are detachably connected by bolts. A mounting bracket 13 is provided on the first shell 11, and positioning protrusions 131 facing the first shell 11 are provided at both ends of the mounting bracket 13. A positioning groove 111 adapted to the positioning protrusion 131 is provided on the first shell 11. A connecting hole 132 inserted into the limiting slot 410 is also provided on the mounting bracket 13. The mounting bracket 13 is inserted into the limiting slot 410 through the connecting hole 132 and fixed by a riveting process. Mounting holes 130 are also provided at both ends of the mounting bracket 13; the mounting cavity 10 is located on the second shell 12, and the diameter of the mounting cavity 10 gradually decreases from the opening to the bottom, so as to facilitate the locking washer 7 to be pressed and inserted; two static contacts 2 are installed on the side of the first shell 11, and two energized contacts 9 electrically connected to the coil 43 are also installed on the side of the first shell 11.

[0038] In the above embodiment, when the coil 43 is energized, the coil 43 generates a magnetic field to magnetize the static iron core 41 and the moving iron core 42, and the close ends of the static iron core 41 and the moving iron core 42 attract each other and make the moving iron core 42 approach the static iron core 41 and squeeze the reset spring 53, and the moving iron core 42 drives the moving contact piece 3 to approach the static contact 2 until they abut against each other, and then the DC contactor is connected; when the coil 43 is de-energized, the magnetic field around the coil 43 disappears, and the static iron core 41 and the moving iron core 42 are no longer attracted to each other. Under the simultaneous action of the elastic force of the reset spring 53 and the magnetic attraction of the permanent magnet 6 on the moving iron core 42, the moving iron core 42 can accelerate to move in the direction away from the static iron core 41, which can accelerate the moving contact piece 3 to separate from the static contact 2 and disconnect the DC contactor, thereby avoiding the generation of arcs and contact adhesion, thereby making the DC contactor have a longer service life and safer.

Claims

1. A DC contactor, comprising a housing, two static contacts mounted on the housing, a moving contact piece and a driving mechanism, wherein the driving mechanism comprises a static iron core mounted on the housing, a moving iron core capable of being linked with the moving contact piece, and a coil arranged on the periphery of the static iron core and the moving iron core, wherein a first reset mechanism is provided on the side of the moving iron core close to the static iron core, which causes the moving iron core to drive the moving contact piece to separate from the static contact after the coil is powered off, and wherein: A permanent magnet is arranged on one side of the moving iron core away from the static iron core. One end of the permanent magnet is detachably mounted on the shell, and the other end is close to the moving iron core.

2. A DC contactor according to claim 1, characterized in that: A locking washer is provided on the outer periphery of the permanent magnet, a locking pin hole is provided on the end of the permanent magnet away from the moving iron core, a locking latch is connected with a transition fit in the locking pin hole, the locking latch abuts against the end face of the locking washer away from the moving iron core, an installation cavity is provided on the shell, the locking washer is interference fit with the inner side wall of the installation cavity, an arc groove adapted to the locking latch is provided at the bottom of the installation cavity, and the locking latch is clamped between the arc groove and the locking washer.

3. A DC contactor according to claim 2, characterized in that: A magnetic ring is sleeved on the outer periphery of the coil, an insulating coil frame is wrapped inside the coil, an iron core through hole is arranged in the center of the coil frame, one end of the iron core through hole is transitionally matched with the static iron core, and the other end is gap-matched with the moving iron core, the first reset mechanism includes a baffle and an insulating plate, a reset spring, and an insulating gasket located between the moving contact piece and the reset spring, which are sequentially sleeved on the coil frame, the moving contact piece and the insulating gasket are both axially limitedly sleeved on the moving iron core, one end of the reset spring is abutted against the insulating plate, and the other end is abutted against the insulating gasket.

4. A DC contactor according to claim 3, characterized in that: The movable contact piece is gap-matched with one end of the movable iron core close to the permanent magnet. The movable iron core close to the permanent magnet is also sequentially sleeved with an insulating sleeve, a pressure spring, a spring seat and a guide plate that abut against the movable contact piece. One end of the pressure spring abuts against the insulating sleeve and the other end abuts against the spring seat. The spring seat abuts against the guide plate. The movable iron core is also provided with a limiting ring groove that cooperates with the through hole in the center of the guide plate for axial limiting. The guide plate is gap-matched with the side wall of the shell.

5. A DC contactor according to claim 4, characterized in that: A limiting slot is provided at one end of the static iron core away from the moving iron core, a limiting through hole matching the limiting slot is provided on the shell, a limiting bottom plate is also sleeved on the periphery of the static iron core, one end of the coil abuts against the limiting bottom plate, and the other end abuts against the baffle.

6. A DC contactor according to claim 5, characterized in that: The shell is divided into a first shell and a second shell, the first shell and the second shell are detachably connected, a mounting bracket is provided on the first shell, positioning protrusions are provided at both ends of the mounting bracket facing the first shell, a positioning groove adapted to the positioning protrusion is provided on the first shell, and a mounting hole that is inserted into the limiting slot is also provided on the mounting bracket, and the mounting cavity is located on the second shell.

7. A DC contactor according to any one of claims 1 to 6, characterized in that: The two static contacts are mounted on the side surface of the first shell, and two energized contacts electrically connected to the coil are also mounted on the side surface of the first shell.

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