DC contactor

Abstract

The direct current contactor comprises a shell, a contact mechanism is arranged in a contact cavity of the shell, the contact mechanism comprises a movable contact bridge which moves along a straight line in the contact cavity, an anti-short-circuit structure is further arranged in the contact cavity, and the anti-short-circuit structure comprises a supporting piece, a first armature and a second armature. An elastic piece is connected between the supporting piece and the contact cavity, the first armature and the second armature are oppositely arranged at intervals to form a magnetic gap, the first armature and the second armature are fixed to the supporting piece and the movable contact bridge respectively, and when short circuit occurs, the magnetic gap generates a magnetic field to enable the first armature and the second armature to attract each other. The elastic piece provides buffering force for movement of the supporting piece. According to the invention, the support member is elastically connected through the elastic member, and when the elastic deformation of the elastic member provides a buffer effect for the movement of the support member, the gap between the first armature and the second armature can be eliminated during the overtravel of the product.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a direct current contactor. Background Art

[0002] A DC contactor is a contactor whose iron core is controlled by a DC coil. Its load can be DC or AC. It has been widely used in new energy vehicles, charging piles, photovoltaic power generation and other fields. The short-circuit resistance of a DC contactor is an important indicator for measuring the safety of product use. When a short-circuit fault occurs, the current contracts at the moving contact bridge and the static contact. When the moving contact bridge is subjected to electric repulsive force, the moving contact bridge moves away from the static contact. When a gap appears between the moving contact bridge and the static contact, an arc is generated, causing product loss or even explosion.

[0003] In order to improve the short-circuit resistance of DC contactors, existing methods have the following defects: First, the electric repulsion is overcome by increasing the contact pressure between the moving contact bridge and the static contact, but the electromagnetic attraction force requirement is too high, resulting in a large coil volume and high product cost; second, an armature is riveted to the bracket on one side of the static contact, and the moving contact bridge still requires a large electrical holding force to overcome the electric repulsion, resulting in a high temperature rise and a large coil volume; third, the product requires overtravel, and the push rod still needs to drive the upper armature to continue moving after the moving contact bridge and the static contact come into contact, and a gap will be generated between the upper and lower armatures. Summary of the invention

[0004] The object of the present invention is to overcome at least one defect of the prior art and provide a DC contactor.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a DC contactor, comprising a shell, a contact mechanism is arranged in a contact cavity of the shell, the contact mechanism includes a moving contact bridge moving in a straight line in the contact cavity, an anti-short circuit structure is also arranged in the contact cavity, the anti-short circuit structure includes a support member, a first armature and a second armature, an elastic member is connected between the support member and the contact cavity, the first armature and the second armature are spaced relative to each other to form a magnetic gap, and the first armature and the second armature are respectively fixed to the support member and the moving contact bridge, when a short circuit occurs, the magnetic gap generates a magnetic field to attract the first armature and the second armature to each other, and the elastic member provides a buffering force for the movement of the support member.

[0007] Preferably, the contact mechanism also includes two stationary contacts, which are fixed in the drive cavity and spaced opposite to the two ends of the moving contact bridge. The first armature is fixed to the side of the support member facing the moving contact bridge, and the second armature is fixed to the side of the moving contact bridge facing away from the stationary contacts.

[0008] Preferably, the first armature is located in a contact cavity between two stationary contacts, and the first armature is opposite to a side of the moving contact bridge facing the stationary contacts.

[0009] Preferably, the elastic member is a spring sheet or a spring, and the elastic member is connected to a side of the support member facing the static contact, or the elastic member is connected to a side of the support member facing away from the static contact.

[0010] Preferably, the first armature is embedded in a mounting groove provided on the support member so that the first armature and the side of the support member facing the moving contact bridge remain flat, or the first armature is fixedly arranged on the side of the support member facing the moving contact bridge.

[0011] Preferably, the housing further comprises a driving cavity axially arranged with the contact cavity, an electromagnetic driving mechanism is arranged in the driving cavity, a push rod of the electromagnetic driving mechanism extends into the contact cavity to drive the moving contact bridge, and the elastic member is located at one end of the contact cavity close to the driving cavity.

[0012] Preferably, the support member includes a pair of support arms arranged at intervals, each support arm is arranged in the contact cavity along a direction parallel to the moving trajectory of the moving contact bridge, a connecting arm is connected between the pair of support arms, and the connecting arm spans the middle part of the moving contact bridge and a first armature is provided on the side facing the moving contact bridge.

[0013] Preferably, the two support arms extend respectively on opposite sides of the middle of the moving contact bridge in a direction away from the static contact, and an end of each support arm away from the static contact is connected to an elastic member.

[0014] Preferably, a guide seat is further provided in the contact cavity, and a guide structure that slidably cooperates with each other is provided between the guide seat and each support arm, and the moving trajectory of the support member is limited by the guide structure.

[0015] Preferably, there are two guide seats, each of which is fixed to a side of the contact cavity away from the static contact, each of which is provided with a slot, one end of each support arm away from the connecting arm is slidably inserted into the slot, and the elastic member is correspondingly arranged in the slot.

[0016] Preferably, the support arm is fixedly connected to the elastic member, or a plug-in protrusion and a plug-in groove that are plugged into each other are provided between the support arm and the elastic member.

[0017] Preferably, the contact mechanism further comprises a mounting assembly, and the second armature and the moving contact bridge are assembled on the mounting assembly.

[0018] Preferably, the mounting assembly includes a contact frame and a fixed plate, the contact frame is fixed to the fixed plate to form an assembly space between the contact frame and the fixed plate, the moving contact bridge and the second armature are arranged on the side of the contact frame away from the fixed plate, a through hole is provided in the middle of the fixed plate, a push rod slides through the through hole, and a contact spring is elastically connected between the push rod and the second armature.

[0019] Preferably, the fixing plate is further provided with an insulating plate, the insulating plate is located in the assembly space and has a corresponding through hole for the push rod to pass through, and the contact spring is located between the insulating plate and the moving contact bridge.

[0020] Preferably, the contact frame is provided with a pair of connecting holes, the spacing between the pair of connecting holes is greater than the middle width of the moving contact bridge, so that the two ends of the first armature and / or the second armature pass through the connecting holes correspondingly to form a magnetic gap between the first armature and the second armature.

[0021] In the DC contactor of the present invention, the first armature and the second armature are respectively arranged on the support member and the moving contact bridge. When the first armature and the second armature are magnetized during a short circuit, the movement of the first armature only needs to overcome the electric repulsion force, and no additional driving force is required from the electromagnetic drive mechanism. At the same time, the support member is elastically connected through an elastic member, and the elastic deformation of the elastic member provides a buffering effect for the movement of the support member, which is beneficial to eliminate the gap between the first armature and the second armature when the product overtravels.

[0022] In addition, the first armature can be embedded in the mounting groove of the support member, so that the support member and the side of the first armature facing the moving contact bridge remain flat, which is conducive to saving internal space.

[0023] In addition, a guide structure is provided between the support member and the guide seat, and the moving track of the support member is limited by the guide structure to avoid unnecessary shaking of the support member during the movement.

[0024] In addition, the elastic member can be a spring sheet or a spring, which has the advantages of simple structure and low cost.

[0025] In addition, the second armature and the moving contact bridge are both arranged on the mounting assembly, and the mounting assembly provides an assembly position for the moving contact bridge and the second armature to ensure stable assembly of the second armature and the moving contact bridge. In particular, a connecting hole is arranged on the contact frame, so that the first armature and the second armature can cooperate with each other through the connecting hole to form a magnetic gap, thereby improving the degree of coordination between the anti-short-circuit structure and the moving contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a DC contactor of the present invention;

[0027] Figure 2 is a cross-sectional view of a DC contactor in the present invention;

[0028] Figure 3 is an exploded schematic diagram of the anti-short circuit structure of the first embodiment of the present invention;

[0029] Figure 4 is an exploded schematic diagram of the anti-short circuit structure of the second embodiment of the present invention;

[0030] Figure 5 is an exploded schematic diagram of the anti-short circuit structure of the third embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the support member in the present invention. Figure 1 ;

[0032] Figure 7 This is a schematic diagram of the structure of the support member in the present invention. Figure 2 ;

[0033] Figure 8 It is a structural schematic diagram of the first armature in the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the second armature in the present invention;

[0035] Fig.10 It is a schematic diagram of the structure of the elastic member in the present invention;

[0036] Fig.11 It is a schematic diagram of the structure of the contact frame in the present invention;

[0037] Fig.12 It is a schematic diagram of the structure of a pair of guide seats in the present invention;

[0038] Reference numerals:

[0039] 1-housing, 11-contact cavity, 12-driving cavity, 2-electromagnetic driving mechanism, 21-push rod, 31-moving contact bridge, 32-static contact, 33-contact spring, 34-contact frame, 341-connecting hole, 342-card slot, 35-insulating plate, 36-fixing plate, 41-support member, 411-support arm, 412-connecting arm, 413-mounting slot, 414-plug-in protrusion, 42-first armature, 43-second armature, 44-elastic member, 441-plug-in slot, 45-guide seat, 451-slot. DETAILED DESCRIPTION

[0040] The specific implementation of the DC contactor of the present invention is further described below in conjunction with the embodiments given in the accompanying drawings. The DC contactor of the present invention is not limited to the description of the following embodiments.

[0041] The DC contactor includes a housing 1, which is divided into a contact cavity 11 and a drive cavity 12 along the axial direction, wherein the contact cavity 11 is used to assemble a contact mechanism, and the contact mechanism includes two stationary contacts 32 and a moving contact bridge 31, wherein the two stationary contacts 32 are arranged side by side on a side of the contact cavity 11 away from the drive cavity 12, and one end of each stationary contact 32 is provided with a wiring portion, and the wiring portion is sealed and passes through the housing 1 for external wiring. Usually, an isolation plate is provided between the two wiring portions, and the two ends of the moving contact bridge 31 are respectively opposite to the two stationary contacts 32 in the contact cavity 11, and an electromagnetic drive mechanism 2 is provided in the drive cavity 12, and the electromagnetic drive mechanism 2 can adopt the existing technology, that is, the electromagnetic drive mechanism 2 includes a coil assembly and a magnetic yoke surrounding and arranged outside the coil assembly. The coil assembly usually includes a coil frame and a coil wound around the outside of the coil frame. A moving iron core is slidably arranged in the middle of the coil frame. The moving iron core is spaced and opposite to the fixedly assembled magnetic pole piece. When the coil assembly is energized, the coil assembly and the magnetic yoke cooperate to generate a magnetic field between the moving iron core and the magnetic pole piece. The moving iron core is driven by the magnetic field to move in a straight line along the axial direction of the coil frame. The moving iron core is provided with a push rod 21 that can extend out of the coil frame. The push rod 21 passes through the drive cavity 12 and extends into the contact cavity 11 to be driven and connected to the moving contact bridge 31, so that the electromagnetic drive mechanism 2 drives the moving contact bridge 31 to contact or separate with the two static contacts 32 at the same time.

[0042] The improvement of the present application is that an anti-short circuit structure is also provided in the contact cavity 11, and the anti-short circuit structure includes a support member 41, a first armature 42 and a second armature 43, and an elastic member 44 is connected between the support member 41 and the contact cavity 11, the first armature 42 and the second armature 43 are spaced relative to each other to form a magnetic gap, and the first armature 42 and the second armature 43 are respectively fixed to the support member 41 and the moving contact bridge 31, when a short circuit occurs, the magnetic gap generates a magnetic field to attract the first armature 42 and the second armature 43 to each other, and the elastic member 44 provides a buffering force for the movement of the support member 41.

[0043] In this way, the first armature 42 and the second armature 43 are respectively arranged on the support member 41 and the moving contact bridge 31. When the first armature 42 and the second armature 43 are magnetized during a short circuit, the movement of the first armature 42 only needs to overcome the electric repulsion force, and no additional driving force is required from the electromagnetic drive mechanism 2. At the same time, the support member 41 is elastically connected through the elastic member 44. The elastic deformation of the elastic member 44 provides a buffering effect for the movement of the support member 41, which is beneficial to eliminate the gap between the first armature 42 and the second armature 43 when the product overtravels. Preferably, the first armature 42 is located in the contact cavity 11 between the two stationary contacts 32, and the first armature 42 is opposite to the side of the moving contact bridge 31 facing the stationary contact 32, so that the space between the stationary contact 32 and the moving contact bridge 31 can be fully utilized. Furthermore, the first armature 42 is embedded in the mounting groove 413 provided on the support member 41, so that the first armature 42 and the side of the support member 41 facing the moving contact bridge 31 remain flat, which can further save the internal space. Of course, the first armature 42 can also be directly fixed on the side of the support member 41 facing the moving contact bridge 31. The fixed assembly of the first armature 42 and the support member 41 can be assembled by fasteners such as screws, or can be fixedly connected together by providing mutually plug-in protrusions and grooves between the first armature 42 and the support member 41.

[0044] In this embodiment, the elastic member 44 is arranged between the support member 41 and the contact cavity 11, and the elastic member 44 is connected to the side of the support member 41 facing the static contact 32, or the elastic member 44 is connected to the side of the support member 41 facing away from the static contact 32, so that the elastic deformation direction of the elastic member 44 is parallel to the moving trajectory of the push rod 21, so that the elastic deformation of the elastic member 44 can buffer the movement of the support member 41, the elastic member 44 can be a spring sheet or a spring, and the deformation direction of the elastic member 44 is the same as the moving direction of the push rod 21. The elastic member 44 and the support member 41 can be fixedly connected, or a plug-in protrusion 414 and a plug-in groove 441 that are plugged into each other can be set between the support member 41 and the elastic member 44, which has the advantages of simple structure and low cost.

[0045] Combination Figure 1-3 , 6-12 provide a first embodiment of a DC contactor.

[0046] like Figure 1 , 2As shown, the DC contactor includes a shell 1, and the shell 1 can adopt the existing technology. The shell 1 includes a base plate and a cover shell arranged on the base plate. A partition structure is provided in the space between the base plate and the cover shell. The space between the base plate and the cover shell is divided into a contact cavity 11 and a drive cavity 12 along the axial direction of the shell 1 by the partition structure. A contact mechanism is arranged in the contact cavity 11. Correspondingly, a system for extinguishing the arc when the contact mechanism is opened is also arranged in the contact cavity 11. An electromagnetic drive mechanism 2 is assembled in the drive cavity 12. In this embodiment, the contact mechanism, the arc extinguishing system and the electromagnetic drive mechanism 2 can adopt the existing technology.

[0047] like Figure 2 , 3 As shown, the contact mechanism includes two static contacts 32 and a moving contact bridge 31. The two static contacts 32 are fixedly arranged on a side of the contact cavity 11 away from the drive cavity 12. The moving contact bridge 31 is arranged in the contact cavity 11 with a spacing and relative to the two static contacts 32. The two ends of the moving contact bridge 31 serve as moving contact parts and cooperate with the two static contacts 32 respectively. The electromagnetic drive mechanism 2 includes a coil assembly and a magnetic yoke surrounded and arranged on the outside of the coil assembly. The coil assembly includes a coil frame and a coil wound outside the coil frame. A moving iron core is arranged in the middle of the coil frame. The moving iron core is spaced and relative to the fixedly assembled magnetic pole piece. A push rod 21 is provided at one end of the moving iron core. The push rod 21 extends from one end of the coil frame close to the contact mechanism and extends into the contact cavity 11 to drive the moving contact bridge 31.

[0048] In this embodiment, the contact mechanism also includes an installation component for assembling the moving contact bridge 31, and the installation component includes a contact frame 34 and a fixed plate 36. Preferably, the contact frame 34 is a U-shaped frame as a whole, and a pair of connecting holes 341 are opened at the corners of the contact frame 34. The spacing between the pair of connecting holes 341 is greater than the middle width of the moving contact bridge 31. A card slot 342 is opened on the two side walls of the contact frame 34 respectively. The contact frame 34 is buckled on the fixed plate 36, and a space for assembling the moving contact bridge 31 is formed between the contact frame 34 and the fixed plate 36. A through hole for the push rod 21 to pass through is opened in the middle of the fixed plate 36. A contact spring 33 is arranged between the push rod 21 and the moving contact bridge 31. When the push rod 21 drives the moving contact bridge 31 to contact the two static contacts 32, the push rod 21 provides contact pressure for the contact mechanism by squeezing the contact spring 33.

[0049] Furthermore, the fixing plate 36 is also provided with an insulating member, and a through hole for the push rod 21 to pass through is also provided in the middle of the insulating member. In the present embodiment, the fixing plate 36 includes two plate bodies arranged at intervals, and the insulating member is arranged between the two plate bodies, and a protruding structure is provided on the edge of at least one of the plate bodies. Correspondingly, a card slot 342 is provided on the contact frame 34, and the protruding structure is carded in the card slot 342, so that the fixing plate 36 and the contact frame 34 maintain a stable connection.

[0050] like Figure 3 As shown, in the present embodiment, an anti-short circuit structure is further provided in the contact cavity 11, wherein the anti-short circuit structure comprises a support member 41, a first armature 42 and a second armature 43, an elastic member 44 is connected between the support member 41 and the contact cavity 11, in the present embodiment, the elastic member 44 is located on the side of the contact cavity 11 away from the static contact 32, the elastic member 44 is a spring sheet, the first armature 42 and the second armature 43 are spaced apart and relatively form a magnetic gap, the first armature 42 is fixed to the side of the support member 41 facing the moving contact bridge 31, and the second armature 43 is fixed to the side of the moving contact bridge 31 facing away from the static contact 32, when a short circuit fault occurs, the first armature 42 and the second armature 43 are magnetized, so that a magnetic field is generated in the magnetic gap to drive the first armature 42 and the second armature 43 to attract each other, in this process, the first armature 42 and The second armature 43 is close to each other, so that the moving contact bridge 31 and the static contact 32 maintain a contact state. The electric repulsion between the moving contact bridge 31 and the static contact 32 needs to be overcome when the second armature 43 moves toward the first armature 42. When the product needs to overtravel, the support member 41 is elastically connected through the elastic member 44. The elastic deformation of the elastic member 44 can eliminate the gap between the first armature 42 and the second armature 43. That is, when the second armature 43 continues to move in the direction close to the first armature 42, the elastic member 44 provides the support member 41 and the first armature 42 with an elastic driving force to approach the second armature 43. In addition, when the second armature 43 and the first armature 42 are attracted to each other, the movement of the second armature 43 can drive the support member 41 to move, thereby facilitating the elimination of the gap between the first armature 42 and the second armature 43.

[0051] like Figure 3 , 6 -8, the support member 41 includes a pair of support arms 411 arranged at intervals, each support arm 411 is arranged in the contact cavity 11 along a direction parallel to the moving trajectory of the push rod 21, and a connecting arm 412 is connected between the pair of support arms 411, so that the support member 41 is a U-shaped frame structure as a whole. Preferably, the connecting arm 412 spans the middle part of the moving contact bridge 31 and a first armature 42 is arranged on the side facing the moving contact bridge 31. Further, a mounting groove 413 is provided on the side of the connecting arm 412 facing the moving contact bridge 31. In this embodiment, the first armature 42 is a rectangular body structure as a whole. The first armature 42 is embedded in the mounting groove 413, so that the first armature 42 and the side of the connecting arm 412 facing the moving contact bridge 31 remain flat. At the same time, since the connecting arm 412 crosses the moving contact bridge 31, the first armature 42 is correspondingly located between the two stationary contacts 32. At this time, each support arm 411 extends away from one end of the connecting arm 412 toward the direction close to the drive cavity 12, that is, the extension direction of each support arm 441 is parallel to the moving trajectory of the moving contact bridge 31, and the two support arms 411 extend respectively on opposite sides of the middle of the moving contact bridge 31 in a direction away from the stationary contact 32.

[0052] like Figure 3 and 10 As shown, the elastic member 44 between the support member 41 and the contact chamber 11 is a pair of spring sheets, each of which is connected to one end of each support arm 411 away from the connecting arm 412. In this embodiment, the elastic member 44 includes a connecting wall, and a plug-in slot 441 is opened in the middle of the connecting wall. The plug-in slot 441 is preferably irregular in shape, but can also be regular in shape. Fig.10 In the figure, the connecting wall is a rectangular structure, and the three edges of the connecting wall are respectively connected to an elastic wall at an angle. When the connecting wall is pressed, the angle between the connecting wall and each elastic wall increases to cause elastic deformation. A central hole is opened in the middle of each elastic wall, thereby reducing the material used for the elastic member 44 and reducing the cost; a plug-in protrusion 414 is protruding from the end face of each support arm 411, and the shape of the plug-in protrusion 414 is preferably matched with the plug-in groove 441, and the plug-in protrusion 414 is plugged into the plug-in groove 441 to realize the connection between the support member 41 and the elastic member 44.

[0053] Furthermore, the anti-short circuit structure also includes a pair of guide seats 45, which are fixed to one side of the contact cavity 11 close to the drive cavity 12, and a guide structure that slides with each other is provided between the guide seat 45 and each support arm 411, and the guide structure limits the moving track of the support member 41 when a short circuit occurs, such as Figure 3 and 12 As shown, the guide seat 45 includes a main body, which is fixed on the side of the contact cavity 11 away from the static contact 32. Each guide seat 45 is provided with a slot 451. One end of each support arm 411 away from the connecting arm 412 is slidably inserted into the slot 451. The sliding insertion of the slot 451 and the edge of the support arm 411 can be regarded as a pair of guide structures that slide with each other. Of course, at least one pair of sliding grooves and rails that slide and plug into each other can be further arranged on the side walls of the slot 451 and the side walls of the support arm 411 to form another pair of guide structures. In this embodiment, the shape of the guide seat 45 is not specifically limited so as to realize the guiding function.

[0054] In this embodiment, if Figure 3 , 9As shown in Figure 11, the second armature 43 is arranged on the side of the moving contact bridge 31 facing away from the static contact 32. It can also be understood that the second armature 43 and the moving contact bridge 31 are jointly arranged on the mounting assembly, that is, the second armature 43 is arranged between the insulating plate 35 and the moving contact bridge 31, one end of the contact spring 33 abuts against the side of the second armature 43 facing away from the moving contact, and the two ends of the second armature 43 are respectively bent and extended from the opposite sides of the middle of the moving contact bridge 31, so that the second armature 43 is a U-shaped body as a whole. Preferably, the extension height of the two ends of the second armature 43 is greater than the thickness of the middle of the moving contact bridge 31, so that the two end portions of the second armature 43 protrude from the moving contact bridge 31 facing the static The surface of one side of the contact 32 passes through the connecting hole 341 on the contact frame 34, and a magnetic gap is formed by the gap between the two end portions of the second armature 43 and the first armature 42. When a short circuit occurs, the magnetized second armature 43 moves toward the direction close to the first armature 42, and at the same time drives the moving contact bridge 31 to move toward the direction close to the static contact 32. At this time, the movement of the second armature 43 only needs to overcome the electric repulsion of the contact mechanism. In this process, the first armature 42 is also driven to move toward the direction close to the second armature 43, and at the same time presses the elastic member 44 to undergo elastic deformation, thereby ensuring that the two end portions of the second armature 43 are in contact with the first armature 42.

[0055] Combination Figure 1 , 2 and 4 provide a second embodiment of the DC contactor.

[0056] In this embodiment, except for the anti-short circuit protection structure, the rest of the parts are the same as those of the first embodiment.

[0057] like Figure 4 As shown, the anti-short circuit structure of this embodiment includes a support member 41, a first armature 42 and a second armature 43, wherein the support member 41 is an integrally formed U-shaped body, and the support member 41 includes a pair of spaced-apart support arms 411, Figure 4 In the embodiment, each support arm 411 is a plate structure, a connecting arm 412 is connected between a pair of support arms 411, and a mounting groove 413 is no longer provided in the middle of the connecting arm 412, but at least one groove is provided in the middle of the connecting arm 412. Figure 4 In the embodiment, two grooves are formed on the connecting arm 412, and one end of each supporting arm 411 away from the connecting arm 412 is bent and extended to form a convex edge, and a fixing hole can be formed on the convex edge, and a fastener is arranged in the fixing hole for connecting with the elastic member 44.

[0058] In this embodiment, the support member 41 may also be configured with the same guide seat 45 as in the first embodiment, and the guide structure is formed by the sliding fit between the convex edge and the slot 451 of the guide seat 45 .

[0059] In this embodiment, the first armature 42 is provided with a protrusion based on the structure of the first embodiment, and each protrusion is plug-fitted with a corresponding groove. Figure 4 In the embodiment, two protrusions are provided on the side of the first armature 42 facing away from the moving contact bridge 31. At this time, the first armature 42 is located outside the side of the connecting arm 412 facing the moving contact bridge 31, that is, the first armature 42 protrudes from the outside of the connecting arm 412; the second armature 43 has the same structure as that of the first embodiment, and cooperates with the mounting assembly in the contact mechanism in the same way.

[0060] In this embodiment, the elastic member 44 has a similar structure to that in the first embodiment, except that the insertion groove 441 on the connecting wall of the elastic member 44 is replaced by a fixing hole, so as to facilitate the assembly of fasteners with the fixing hole on the convex edge of the support arm 411.

[0061] Combination Figure 1 , 2 5 and 5 provide a third embodiment of the DC contactor.

[0062] In this embodiment, except for the elastic member 44 in the anti-short circuit protection structure, the rest of the parts are the same as the first embodiment. The elastic member 44 of this embodiment is a spring. Correspondingly, the plug-in protrusion 414 on the support arm 411 in the support member 41 is plugged into the middle part of the spring, thereby realizing the connection with the elastic member 44.

[0063] In addition, in the above embodiment, the first armature 42 can adopt a U-shaped structure, and the second armature 43 can also adopt a rectangular structure. When a short circuit occurs, the two ends of the first armature 42 need to pass through the connecting hole 341 of the contact frame 34 to cooperate with the second armature 43; or, both the first armature 42 and the second armature 43 adopt a U-shaped structure. When a short circuit occurs, the two ends of the first armature 42 and the second armature 43 are attracted in the connecting hole 341 of the contact frame 34, but the first armature 42 adopts a U-shaped structure, which increases the cost and increases the required space.

[0064] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0065] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A DC contactor, comprising a housing (1), a contact mechanism being arranged in a contact cavity (11) of the housing (1), the contact mechanism comprising a moving contact bridge (31) moving in a straight line in the contact cavity (11), characterized in that: An anti-short circuit structure is also provided in the contact cavity (11), and the anti-short circuit structure comprises a support member (41), a first armature (42) and a second armature (43); an elastic member (44) is connected between the support member (41) and the contact cavity (11); the first armature (42) and the second armature (43) are spaced relative to each other to form a magnetic gap, and the first armature (42) and the second armature (43) are respectively fixed to the support member (41) and the moving contact bridge (31); when a short circuit occurs, the magnetic gap generates a magnetic field so that the first armature (42) and the second armature (43) are attracted to each other, and the elastic member (44) provides a buffer force for the movement of the support member (41).

2. The DC contactor according to claim 1, characterized in that: The contact mechanism further comprises two stationary contacts (32), the two stationary contacts (32) being fixed in the drive cavity (12) and spaced apart from two ends of the moving contact bridge (31), the first armature (41) being fixed to a side of the support member (41) facing the moving contact bridge (31), and the second armature (43) being fixed to a side of the moving contact bridge (31) facing away from the stationary contacts (32).

3. The DC contactor according to claim 2, characterized in that: The first armature (42) is located in a contact cavity (11) between two stationary contacts (32), and the first armature (42) is opposite to a side of the moving contact bridge (31) facing the stationary contact (32).

4. The DC contactor according to claim 2, characterized in that: The elastic member (44) is a spring sheet or a spring, and the elastic member (44) is connected to the side of the support member (41) facing the stationary contact (32), or the elastic member (44) is connected to the side of the support member (41) facing away from the stationary contact (32).

5. The DC contactor according to claim 1, characterized in that: The first armature (42) is embedded in a mounting groove (413) provided on the support member (41), so that the first armature (42) and a side of the support member (41) facing the moving contact bridge (31) remain flat, or the first armature (42) is fixedly arranged on a side of the support member (41) facing the moving contact bridge (31).

6. The DC contactor according to claim 1, characterized in that: The housing (1) further comprises a drive cavity (12) arranged axially with the contact cavity (11); an electromagnetic drive mechanism (2) is arranged in the drive cavity (12); a push rod (21) of the electromagnetic drive mechanism (2) extends into the contact cavity (11) to drive the moving contact bridge (31); and the elastic member (44) is located at one end of the contact cavity (11) close to the drive cavity (12).

7. The DC contactor according to any one of claims 2 to 6, characterized in that: The support member (41) comprises a pair of support arms (411) arranged at intervals, each support arm (411) being arranged in the contact cavity (11) along a direction parallel to the moving track of the moving contact bridge (31), a connecting arm (412) being connected between the pair of support arms (411), and the connecting arm (412) being arranged to cross the middle of the moving contact bridge (31) and a first armature (42) being arranged on a side facing the moving contact bridge (31).

8. The DC contactor according to claim 7, characterized in that: The two support arms (411) extend respectively on opposite sides of the middle of the moving contact bridge (31) in a direction away from the stationary contact (32), and one end of each support arm (411) away from the stationary contact (32) is connected to an elastic member (44).

9. The DC contactor according to claim 7, characterized in that: A guide seat (45) is also provided in the contact cavity (11), and a guide structure that slidably cooperates with each other is provided between the guide seat (45) and each support arm (411), and the moving track of the support member (41) is limited by the guide structure.

10. The DC contactor according to claim 9, characterized in that: There are two guide seats (45), each of which is fixed to a side of the contact cavity (11) away from the stationary contact (32), and each of which is provided with a slot (451). One end of each support arm (411) away from the connecting arm (412) is slidably inserted into the slot (451), and the elastic member (44) is correspondingly arranged in the slot (451).

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