A contact system and a DC contactor

Abstract

The utility model belongs to the technical field of low-voltage electrical appliances, and discloses a contact system and a DC contactor. The contact system includes a main contact assembly and an auxiliary contact assembly, and the auxiliary contact assembly includes an auxiliary contact, a connector and a switch member, and the auxiliary contact, the connector and the switch member form a circuit; one end of the connector is conductively connected to the switch member, and the other end forms an elastic clamping portion with a clamping groove, and the elastic clamping portion is clamped and elastically abutted with the auxiliary contact through the clamping groove; the switch member is used for synchronous disconnection when the main contact assembly switches the on-off state. During assembly, it is only necessary to clamp the auxiliary contact into the elastic clamping portion, which can reduce the difficulty of assembly, and the elastic clamping portion can elastically abut on the auxiliary contact with a certain pressure, ensuring good and reliable conductive contact with the auxiliary contact, improving contact stability, and ensuring that the auxiliary contact assembly can accurately indicate the on-off state of the main contact assembly of the DC contactor.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a contact system and a DC contactor. Background Art

[0002] A DC contactor is a contactor whose core is controlled by a DC coil. The coil is connected to a DC current, so there is no impact starting current and no violent impact of the core. It has a long service life and is suitable for occasions with frequent starts and stops. During the use of a DC contactor, it is necessary to consider the issue of state monitoring so that the abnormality can be discovered and handled in time when the main circuit is abnormal (adhesion, non-conduction, etc.).

[0003] In the prior art, in order to realize the state detection of the main circuit of the DC contactor, an auxiliary contact is usually provided. The auxiliary contact and the switch constitute an auxiliary circuit. The opening or closing of the auxiliary circuit is consistent with the main circuit. The state of the main circuit can be judged through the auxiliary circuit. However, the assembly of the auxiliary contact in the DC contactor is relatively complicated, and the position of the auxiliary contact is prone to poor contact, resulting in the inability of the auxiliary circuit to accurately indicate the on-off state of the main circuit.

[0004] Therefore, there is an urgent need for a contact system and a DC contactor to solve the above problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a contact system and a DC contactor, which can reduce the difficulty of assembling an auxiliary contact in a DC contactor, improve contact stability, and ensure that the auxiliary contact can accurately indicate the on-off state of a main circuit of the DC contactor.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a contact system is provided, comprising:

[0008] A main contact assembly having an on and off state;

[0009] The auxiliary contact assembly comprises an auxiliary contact, a connecting piece and a switch piece, wherein the auxiliary contact, the connecting piece and the switch piece constitute a circuit; one end of the connecting piece is conductively connected to the switch piece, and the other end forms an elastic clamping portion with a clamping groove, wherein the elastic clamping portion is clamped and elastically abutted with the auxiliary contact through the clamping groove; and the switch piece is used for synchronous disconnection when the main contact assembly switches the on-off state.

[0010] As an optional solution of the contact system provided by the utility model, the elastic clamping portion includes a first spring sheet, a clamping section and a second spring sheet that are bent and connected in sequence, the first spring sheet and the second spring sheet are arranged opposite to each other, and the distance between the first spring sheet and the second spring sheet gradually increases in the direction away from the clamping section, and the first spring sheet, the clamping section and the second spring sheet are arranged to form the clamping groove.

[0011] As an optional solution of the contact system provided by the utility model, the engaging section includes a third spring sheet, a fourth spring sheet, a fifth spring sheet and a sixth spring sheet which are bent and connected in sequence; the third spring sheet is bent and connected to the first spring sheet and is opposite to the sixth spring sheet, the sixth spring sheet is bent and connected to the second spring sheet, and the fourth spring sheet and the fifth spring sheet are arranged in a V shape;

[0012] Alternatively, the engaging section is U-shaped, V-shaped or arc-shaped;

[0013] And / or, the engaging section and the first elastic piece are both connected via a transition arc surface, and the transition arc surface abuts against the auxiliary contact.

[0014] As an optional solution of the contact system provided by the utility model, the contact system also includes a mounting frame, the connecting member includes a first connecting piece and a second connecting piece that are bent and connected, the first connecting piece is embedded in the mounting frame and is conductively connected to the switch member, and the second connecting piece is mounted on the surface of the mounting frame and is connected to the elastic clip portion.

[0015] As an optional solution of the contact system provided by the utility model, the contact system further includes an outer cover component, the mounting bracket is arranged inside the outer cover component, and the auxiliary contact is connected through the outer cover component;

[0016] The mounting frame is provided with a first groove and a second groove corresponding to the auxiliary contact; one end of the first connecting piece extends into the first groove, and the switch element is arranged in the first groove; the elastic clamping portion is located in the second groove.

[0017] As an optional solution of the contact system provided by the utility model, two of the connecting pieces and two of the auxiliary contacts are provided, the two connecting pieces are respectively connected to the two ends of the switch element, the two auxiliary contacts are correspondingly clamped to the elastic clamping parts of the two connecting pieces, and are electrically connected through a conductive piece.

[0018] As an optional solution of the contact system provided by the utility model, the main contact assembly includes a main static contact, an active contact and a push rod assembly, the push rod assembly is connected to the active contact, and is used to drive the active contact to move to contact or separate from the main static contact, and a permanent magnet is arranged on the push rod assembly, and the permanent magnet moves between a first position and a second position under the drive of the push rod assembly;

[0019] The switch element includes a reed switch; the reed switch is used to close under the action of the magnetic field of the permanent magnet at the first position, and is used to open when the permanent magnet moves to the second position.

[0020] As an optional solution of the contact system provided by the utility model, the contact system further includes a moving iron core, and the push rod assembly includes a push rod body, an insulating seat and an elastic member;

[0021] The first end of the push rod body is connected to the moving iron core, and the other end is connected to the insulating seat; the permanent magnet is embedded in the insulating seat; one end of the elastic member is connected to the insulating seat, and the other end is connected to the active contact.

[0022] As an optional solution of the contact system provided by the utility model, the push rod assembly further includes a connecting piece, a first bracket and a second bracket;

[0023] The connecting piece is embedded in the insulating seat and both ends extend out of the insulating seat. Both ends of the first bracket are provided with connecting holes, and the connecting holes at both ends are correspondingly plugged with the two ends of the connecting piece. An accommodating space is formed between the first bracket and the insulating seat, and the elastic member and the active contact are arranged in the accommodating space.

[0024] The second bracket is buckled on the active contact and is provided with a protrusion; the first bracket is provided with a notch, and the protrusion is movably inserted into the notch.

[0025] On the other hand, a DC contactor is provided, comprising a housing, an electromagnetic system and the contact system as described above, wherein the contact system and the electromagnetic system are located in the housing, and the electromagnetic system is used to drive a main contact component of the contact system to switch between on and off states.

[0026] Beneficial effects of the utility model:

[0027] The utility model provides a contact system and a DC contactor including the contact system. Since the switch element of the auxiliary contact assembly can be disconnected synchronously when the main contact assembly switches the on-off state, the on-off state of the main contact assembly can be judged by means of the state of the loop formed by the auxiliary contact assembly, thereby realizing the state monitoring of the DC contactor. By arranging an elastic clamping part with a clamping groove on the connecting part, when assembling the auxiliary contact, it is only necessary to clamp one end of the auxiliary contact into the clamping groove of the elastic clamping part. On the one hand, it can reduce the difficulty of assembling the auxiliary contact in the DC contactor, so that the auxiliary contact can be electrically connected with the switch element through the connecting part, thereby forming a loop indicating the on-off state of the main contact assembly. On the other hand, the elastic clamping part can be elastically abutted on the auxiliary contact with a certain pressure, ensuring good and reliable conductive contact with the auxiliary contact, improving the contact stability, and ensuring that the auxiliary contact assembly can accurately indicate the on-off state of the DC contactor main loop (formed by the main contact assembly). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0029] Figure 1 It is an axonometric diagram of the contact system provided by the specific implementation mode of the utility model;

[0030] Figure 2 It is an exploded schematic diagram of a contact system provided by a specific embodiment of the utility model;

[0031] Figure 3 It is a first cross-sectional schematic diagram of a contact system provided by a specific embodiment of the utility model;

[0032] Figure 4 It is a structural schematic diagram of an auxiliary contact assembly provided in a specific embodiment of the utility model;

[0033] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0034] Figure 6 It is a second cross-sectional schematic diagram of the contact system provided by the specific embodiment of the utility model;

[0035] Figure 7 It is a structural schematic diagram of a push rod assembly provided in a specific embodiment of the utility model;

[0036] Figure 8It is an exploded schematic diagram of a push rod assembly provided in a specific embodiment of the utility model.

[0037] In the figure:

[0038] 1. Main contact assembly; 2. Auxiliary contact assembly; 3. Mounting frame; 4. Cover assembly; 5. Moving iron core; 6. Mounting cylinder; 7. Reset spring; 8. Fixed seat;

[0039] 11. Main static contact; 12. Active contact; 13. Push rod assembly; 14. Permanent magnet;

[0040] 131, push rod body; 132, insulating seat; 133, elastic member; 134, mounting plate; 135, first bracket; 136, second bracket; 130, accommodating space;

[0041] 1351, connecting hole; 1352, notch portion; 1361, raised portion;

[0042] 21. Auxiliary contact; 22. Connector; 23. Switch;

[0043] 220, snap-fit ​​groove; 221, elastic snap-fit ​​portion; 222, first connecting piece; 223, second connecting piece;

[0044] 2211, first spring piece; 2212, engaging section; 2213, second spring piece; 2214, transition arc surface;

[0045] 22121, the third spring piece; 22122, the fourth spring piece; 22123, the fifth spring piece; 22124, the sixth spring piece;

[0046] 31. First groove; 32. Second groove. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0048] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] In this embodiment, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present utility model generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the embodiments of the present invention, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0053] like Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment provides a contact system, including a main contact assembly 1 and an auxiliary contact assembly 2. Both the main contact assembly 1 and the auxiliary contact assembly 2 have an on-off state, and the auxiliary contact assembly 2 can indicate the on-off state of the main contact assembly 1.

[0054] The auxiliary contact assembly 2 includes an auxiliary contact 21, a connecting piece 22 and a switch piece 23, which form a circuit; one end of the connecting piece 22 is conductively connected to the switch piece 23, and the other end forms an elastic clamping portion 221 with a clamping groove 220, and the elastic clamping portion 221 is clamped and elastically abutted with the auxiliary contact 21 through the clamping groove 220; the switch piece 23 is used for synchronous disconnection when the main contact assembly 1 switches the on-off state.

[0055] Specifically, the circuit where the main contact assembly 1 is located is the main circuit, and the auxiliary contact 21, the connecting piece 22 and the switch piece 23 of the auxiliary contact assembly 2 constitute an auxiliary circuit. The on-off state of the main circuit can be determined by the on-off state of the auxiliary circuit, thereby realizing the state monitoring of the DC contactor.

[0056] The contact system provided in the embodiment of the present application can be used in a DC contactor. Since the switch element 23 of the auxiliary contact component 2 can be disconnected synchronously when the main contact component 1 switches the on-off state, the on-off state of the main contact component 1 can be judged with the help of the state of the loop formed by the auxiliary contact component 2, thereby realizing the state monitoring of the DC contactor. By providing an elastic clamping portion 221 with a clamping groove 220 on the connecting piece 22, when assembling the auxiliary contact 21, it is only necessary to clamp one end of the auxiliary contact 21 into the clamping groove 220 of the elastic clamping portion 221. On the one hand, it can reduce the difficulty of assembling the auxiliary contact 21 in the DC contactor, so that the auxiliary contact 21 can be electrically connected to the switch member 23 through the connecting piece 22, thereby forming a circuit indicating the on-off state of the main contact assembly 1. On the other hand, the elastic clamping portion 221 can elastically abut against the auxiliary contact 21 with a certain pressure, ensuring good and reliable conductive contact with the auxiliary contact 21, improving the contact stability, and ensuring that the auxiliary contact assembly 2 can accurately indicate the on-off state of the DC contactor main circuit (formed by the main contact assembly 1).

[0057] In this embodiment, Figure 3 and Figure 4 As shown, two connectors 22 and two auxiliary contacts 21 are provided, and the two connectors 22 are respectively connected to the two ends of the switch 23, and the two auxiliary contacts 21 are correspondingly clamped to the elastic clamping parts 221 of the two connectors 22, and are electrically connected through the conductive member. The two auxiliary contacts 21, the two connectors 22 and the switch 23 constitute an auxiliary circuit, and the conductive member is exemplarily a wire.

[0058] In this embodiment, see Figure 2 , Figure 3 and Figure 4The elastic clamping portion 221 includes a first elastic piece 2211, a clamping section 2212 and a second elastic piece 2213 which are bent and connected in sequence. The first elastic piece 2211 and the second elastic piece 2213 are arranged opposite to each other, and the distance between the first elastic piece 2211 and the second elastic piece 2213 gradually increases in the direction away from the clamping section 2212. The first elastic piece 2211, the clamping section 2212 and the second elastic piece 2213 are arranged to form the above-mentioned clamping groove 220. The distance between the first elastic piece 2211 and the second elastic piece 2213 gradually increases in the direction away from the clamping section 2212 to form a bell-mouth structure, which facilitates the auxiliary contact 21 to be inserted into the clamping groove 220. The connection between the first elastic piece 2211 and the clamping section 2212, and the connection between the second elastic piece 2213 and the clamping section 2212 elastically abut against the auxiliary contact 21 to ensure good contact with the auxiliary contact 21.

[0059] Furthermore, combined with Figure 5 The engaging section 2212 includes a third spring piece 22121, a fourth spring piece 22122, a fifth spring piece 22123 and a sixth spring piece 22124 which are bent and connected in sequence; the third spring piece 22121 is bent and connected to the first spring piece 2211 and is opposite to the sixth spring piece 22124, the sixth spring piece 22124 is bent and connected to the second spring piece 2213, and the fourth spring piece 22122 and the fifth spring piece 22123 are arranged in a V shape. The third spring piece 22121, the fourth spring piece 22122, the fifth spring piece 22123 and the sixth spring piece 22124 generally form a diamond structure, which is convenient for accommodating the auxiliary contact 21 and is easy to bend and form.

[0060] More specifically, the engaging section 2212 and the first elastic piece 2211 , as well as the engaging section 2212 and the second elastic piece 2213 are connected via a transition arc surface 2214 , which abuts against the auxiliary contact 21 to avoid scratches on the auxiliary contact 21 due to sharp parts.

[0061] In some other embodiments, the engaging section 2212 may also be in a U-shape, a V-shape, or an arc shape, as long as it can accommodate the auxiliary contact 21 .

[0062] See also Figure 1 and Figure 2 The contact system further comprises an outer cover assembly 4, and the main contact assembly 1 and the auxiliary contact assembly 2 are both mounted in the outer cover assembly 4. The outer cover assembly 4 comprises a bottom plate and a cover shell buckled on the bottom plate for easy assembly and disassembly.

[0063] like Figure 2 , Figure 3 as well as Figure 4As shown, the contact system further includes a mounting frame 3, which is fixedly connected to the bottom plate of the outer cover assembly 4. The connecting member 22 includes a first connecting piece 222 and a second connecting piece 223 which are bent and connected. The first connecting piece 222 is embedded in the mounting frame 3 and is conductively connected to the switch member 23. The second connecting piece 223 is laid on the surface of the mounting frame 3 and is connected to the elastic clamping portion 221. The first connecting piece 222 is embedded in the mounting frame 3 to ensure that the connecting member 22 is firmly connected to the mounting frame 3, and the mounting frame 3 can provide support for the second connecting piece 223, so that the entire connecting member 22 maintains its shape and is not easily deformed.

[0064] More specifically, the first connecting piece 222 includes a first spring piece, a second spring piece, and a third spring piece that are bent and connected in sequence. Figure 3 In the middle direction, the first and third springs extend approximately vertically, and the second spring extends approximately horizontally. The two connecting members 22 are arranged in mirror symmetry, and the third springs of the two are close to the middle, the second connecting piece 223 is connected to the third spring, and the second connecting pieces 223 of the two connecting members 22 extend in directions away from each other to connect with the elastic clamping portion 221. The structure of the first connecting piece 222 makes the arrangement of the entire connecting member 22 on the mounting frame 3 more compact and reasonable, saving space.

[0065] In this embodiment, the connector 22 is integrally bent and formed, and has a certain elastic deformation capability while ensuring its strength. The connector 22 can be made of copper sheet, nickel sheet, copper alloy sheet, etc., and has good electrical conductivity.

[0066] Further, see Figure 3 and Figure 6 , the auxiliary contact 21 penetrates and is connected to the housing of the outer cover assembly 4, and one end thereof extends into the interior of the outer cover assembly 4 to be electrically connected to the internal connector 22. The mounting frame 3 is provided with a first groove 31 and a second groove 32 corresponding to the auxiliary contact 21. The switch member 23 is arranged in the first groove 31, and one end of the first spring leaf of the first connecting piece 222 is bent and connected with an extension section, which extends into the first groove 31 and is electrically connected to the switch member 23. There are two second grooves 32, and the elastic clamping parts 221 of the two connectors 22 are arranged in the two second grooves 32 in a one-to-one correspondence. By providing the first groove 31 for accommodating the switch member 23 and the second groove 32 for accommodating the elastic clamping part 221, the space on the mounting frame 3 can be reasonably utilized, the space occupied by the auxiliary contact assembly 2 can be saved, and the structural layout can be made more compact and reasonable.

[0067] Optionally, the connecting member 22 may be injection molded in the mounting frame 3 to ensure connection strength and reduce subsequent assembly steps.

[0068] Exemplarily, the mounting frame 3 is roughly door-shaped, with fixing seats 8 connected to its two ends through snap fasteners. The fixing seats 8 are connected to the bottom plate of the outer cover assembly 4 through fasteners such as screws to achieve the installation of the mounting frame 3 in the outer cover assembly 4.

[0069] In this embodiment, Figure 2 , Figure 3 as well as Figure 6 As shown, the main contact assembly 1 includes a main static contact 11, an active contact 12 and a push rod assembly 13. The push rod assembly 13 is movably arranged on the outer cover assembly 4 and connected to the active contact 12, and is used to drive the active contact 12 to move to contact or separate from the main static contact 11. A permanent magnet 14 is arranged on the push rod assembly 13. The permanent magnet 14 moves between the first position and the second position under the drive of the push rod assembly 13. The switch member 23 is specifically a reed switch, which is used to close under the magnetic field of the permanent magnet 14 in the first position, and is used to disconnect when the permanent magnet 14 moves to the second position.

[0070] Specifically, the permanent magnet 14 in the first position is closer to the reed switch than the permanent magnet 14 in the second position. When the push rod assembly 13 drives the permanent magnet 14 to move to the first position, the active contact 12 moves to a position where it contacts and conducts with the main static contact 11. At this time, the permanent magnet 14 is close to the reed switch, and the reed switch is closed and conducted under the magnetic field of the permanent magnet 14, and the auxiliary circuit is conducted, which can indicate the conduction state of the main circuit. When the push rod assembly 13 drives the permanent magnet 14 from the first position to the second position, the active contact 12 moves to a position separated from the main static contact 11, and the main circuit is disconnected. At this time, the permanent magnet 14 is far away from the reed switch, and the reed switch is no longer affected by the magnetic field of the permanent magnet 14, or the magnetic field effect it is subjected to is weakened, so that the reed switch is switched to a disconnected state, and the auxiliary circuit is cut off, which can indicate the disconnected state of the main circuit.

[0071] like Figure 6 As shown, the contact system further includes a moving iron core 5, which is configured to move under the action of the electromagnetic system of the DC contactor. A mounting tube 6 is provided at the bottom of the bottom plate of the outer cover assembly 4, and the moving iron core 5 is movably disposed in the mounting tube 6. Figure 7 and Figure 8, the push rod assembly 13 includes a push rod body 131, an insulating seat 132 and an elastic member 133. The push rod body 131 movably penetrates the bottom plate of the outer cover assembly 4, and its first end is connected to the moving iron core 5, and the other end is connected to the insulating seat 132; the permanent magnet 14 is embedded in the insulating seat 132; one end of the elastic member 133 is connected to the insulating seat 132, and the other end is connected to the active contact 12. Further, a reset spring 7 is also arranged between the bottom plate of the outer cover assembly 4 and the moving iron core 5, and the reset spring 7 is sleeved on the push rod body 131, which is used to move and reset the moving iron core 5. For example, the coil of the electromagnetic system is energized to move the moving iron core 5 upward, so as to drive the active contact 12 to move through the push rod assembly 13 to achieve contact with the main static contact 11, during which the moving iron core 5 compresses the reset spring 7. When the coil is de-energized, the moving iron core 5 is moved and reset under the elastic force of the reset spring 7.

[0072] Since an elastic member 133 is provided between the insulating seat 132 and the active contact 12, when the active contact 12 contacts the main static contact 11, the elastic member 133 can exert a certain pressure, so that the active contact 12 contacts the main static contact 11 with a certain pressure, ensuring good conductivity.

[0073] Exemplarily, the permanent magnet 14 is injection molded in the insulating seat 132, which makes the installation more stable and saves the subsequent assembly process.

[0074] like Figure 7 and Figure 8 As shown, the push rod assembly 13 also includes a mounting plate 134, a first bracket 135 and a second bracket 136. The mounting plate 134 is embedded in the insulating seat 132 and both ends extend out of the insulating seat 132. Both ends of the first bracket 135 are provided with connecting holes 1351, and the connecting holes 1351 at both ends are correspondingly plugged with the two ends of the mounting plate 134. The first bracket 135 and the insulating seat 132 are surrounded to form an accommodating space 130, and the elastic member 133 and the active contact 12 are arranged in the accommodating space 130. The second bracket 136 is buckled with the active contact 12 and is provided with a protrusion 1361; the first bracket 135 is provided with a notch 1352, and the protrusion 1361 is movably inserted into the notch 1352.

[0075] In this embodiment, the mounting piece 134 is formed on the insulating seat 132 by injection molding, and its two ends are protruded relative to the two sides of the insulating seat 132, and are used to penetrate the connection hole 1351 on the first bracket 135, and are riveted with the connection hole 1351 on the first bracket 135. The active contact 12 moves in the accommodating space 130, and the movement of the active contact 12 can be guided. Moreover, the cooperation of the protrusion 1361 and the notch 1352 can further improve the guiding accuracy of the active contact 12, so that the movement of the active contact 12 is more stable.

[0076] This embodiment also provides a DC contactor, including a housing, an electromagnetic system and the contact system as described above, the contact system and the electromagnetic system are located in the housing, and the electromagnetic system is used to drive the main contact assembly 1 of the contact system to switch the on and off state. As mentioned above, the electromagnetic system includes a coil that can be energized and de-energized, which can drive the moving iron core 5 to drive the push rod assembly 13 to move, and in combination with the reset spring 7, realize the contact and separation of the active contact 12 and the main static contact 11.

[0077] In the DC contactor with the above contact system, since the switch element 23 of the auxiliary contact assembly 2 can be disconnected synchronously when the main contact assembly 1 switches the on-off state, the on-off state of the main contact assembly 1 can be judged by means of the state of the circuit formed by the auxiliary contact assembly 2, thereby realizing the state monitoring of the DC contactor. By providing an elastic clamping portion 221 with a clamping groove 220 on the connecting member 22, when assembling the auxiliary contact 21, it is only necessary to clamp one end of the auxiliary contact 21 into the clamping groove 220 of the elastic clamping portion 221. On the one hand, it can reduce the difficulty of assembling the auxiliary contact 21 in the DC contactor, so that the auxiliary contact 21 can be electrically connected to the switch element 23 through the connecting member 22, thereby forming a circuit indicating the on-off state of the main contact assembly 1. On the other hand, the elastic clamping portion 221 can elastically abut against the auxiliary contact 21 with a certain pressure, ensuring good and reliable conductive contact with the auxiliary contact 21, improving the contact stability, and ensuring that the auxiliary contact assembly 2 can accurately indicate the on-off state of the DC contactor main circuit (formed by the main contact assembly 1).

[0078] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A contact system, characterized in that: include: A main contact assembly (1) having an on and off state; An auxiliary contact assembly (2) comprises an auxiliary contact (21), a connecting piece (22) and a switch piece (23), wherein the auxiliary contact (21), the connecting piece (22) and the switch piece (23) form a circuit; one end of the connecting piece (22) is conductively connected to the switch piece (23), and the other end forms an elastic clamping portion (221) having a clamping groove (220); the elastic clamping portion (221) is clamped and elastically abutted with the auxiliary contact (21) through the clamping groove (220); and the switch piece (23) is used for synchronous disconnection when the main contact assembly (1) switches between on and off states.

2. The contact system according to claim 1, characterized in that The elastic clamping portion (221) comprises a first elastic sheet (2211), a clamping section (2212) and a second elastic sheet (2213) which are bent and connected in sequence; the first elastic sheet (2211) and the second elastic sheet (2213) are arranged opposite to each other, and the distance between the first elastic sheet (2211) and the second elastic sheet (2213) gradually increases in a direction away from the clamping section (2212); the first elastic sheet (2211), the clamping section (2212) and the second elastic sheet (2213) are arranged to form the clamping groove (220).

3. The contact system according to claim 2, characterized in that The engaging section (2212) comprises a third spring sheet (22121), a fourth spring sheet (22122), a fifth spring sheet (22123) and a sixth spring sheet (22124) which are bent and connected in sequence; the third spring sheet (22121) is bent and connected to the first spring sheet (2211) and is opposite to the sixth spring sheet (22124); the sixth spring sheet (22124) is bent and connected to the second spring sheet (2213); the fourth spring sheet (22122) and the fifth spring sheet (22123) are arranged in a V shape; Alternatively, the engaging section (2212) is in a U-shape, a V-shape, or an arc shape; And / or, the engaging section (2212) and the first elastic piece (2211), as well as the engaging section (2212) and the second elastic piece (2213) are connected via a transition arc surface (2214), and the transition arc surface (2214) abuts against the auxiliary contact (21).

4. The contact system according to claim 1, characterized in that The contact system further comprises a mounting frame (3), the connecting member (22) comprising a first connecting piece (222) and a second connecting piece (223) which are bent and connected, the first connecting piece (222) being embedded in the mounting frame (3) and being conductively connected to the switch member (23), and the second connecting piece (223) being mounted on a surface of the mounting frame (3) and being connected to the elastic clamping portion (221).

5. The contact system according to claim 4, characterized in that The contact system further comprises an outer cover component (4), the mounting frame (3) is arranged inside the outer cover component (4), and the auxiliary contact (21) is connected through the outer cover component (4); The mounting frame (3) is provided with a first groove (31) and a second groove (32) corresponding to the auxiliary contact (21); one end of the first connecting piece (222) extends into the first groove (31), and the switch element (23) is arranged in the first groove (31); and the elastic clamping portion (221) is located in the second groove (32).

6. The contact system according to claim 1, characterized in that Two of each of the connecting pieces (22) and the auxiliary contacts (21) are provided, the two connecting pieces (22) are respectively connected to two ends of the switch piece (23), and the two auxiliary contacts (21) are correspondingly clamped to the elastic clamping portions (221) of the two connecting pieces (22) one by one, and are electrically connected via a conductive piece.

7. The contact system according to any one of claims 1 to 6, characterized in that: The main contact assembly (1) comprises a main static contact (11), a driving contact (12) and a push rod assembly (13); the push rod assembly (13) is connected to the driving contact (12) and is used to drive the driving contact (12) to move so as to contact or separate from the main static contact (11); a permanent magnet (14) is provided on the push rod assembly (13); the permanent magnet (14) moves between a first position and a second position under the drive of the push rod assembly (13); The switch element (23) comprises a reed switch, which is used to close under the action of the magnetic field of the permanent magnet (14) at the first position, and is used to open when the permanent magnet (14) moves to the second position.

8. The contact system according to claim 7, characterized in that The contact system further comprises a moving iron core (5), and the push rod assembly (13) comprises a push rod body (131), an insulating seat (132) and an elastic member (133); The first end of the push rod body (131) is connected to the moving iron core (5), and the other end is connected to the insulating seat (132); the permanent magnet (14) is embedded in the insulating seat (132); one end of the elastic member (133) is connected to the insulating seat (132), and the other end is connected to the active contact (12).

9. The contact system according to claim 8, characterized in that The push rod assembly (13) further comprises a mounting plate (134), a first bracket (135) and a second bracket (136); The mounting piece (134) is embedded in the insulating seat (132) and both ends extend out of the insulating seat (132); both ends of the first bracket (135) are provided with connecting holes (1351), and the connecting holes (1351) at both ends are correspondingly plugged into the two ends of the mounting piece (134); an accommodating space (130) is formed between the first bracket (135) and the insulating seat (132); the elastic member (133) and the active contact (12) are arranged in the accommodating space (130); The second bracket (136) is snapped onto the active contact (12) and is provided with a protruding portion (1361); the first bracket (135) is provided with a notch portion (1352), and the protruding portion (1361) is movably inserted into the notch portion (1352).

10. A DC contactor, characterized in that: The invention comprises a housing, an electromagnetic system and a contact system as claimed in any one of claims 1 to 9, wherein the contact system and the electromagnetic system are located in the housing, and the electromagnetic system is used to drive a main contact component (1) of the contact system to switch between on and off states.

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