Arc extinguishing structure for high-capacity contactor and contactor

Abstract

The utility model relates to an arc extinguishing structure used for a large capacity contactor and a contactor, an arc extinguishing chamber of the contactor comprises a pedestal and a housing detachably installed on the pedestal, the arc extinguishing structure comprises a grid sheet group and a pair of contacts corresponding to the contactor, and the grid sheet group comprises a plurality of grid sheet members which are parallel to each other and are arranged at intervals; the grid piece frame is provided with a group of inserting grooves corresponding to the grid piece group, the grid piece pieces are connected with the inserting grooves in an inserted mode, and the grid piece frame is detachably connected with the shell; the arc guide sheet is fixedly installed on the base and located on one side of the contact, and a gap is formed between the arc guide sheet and one grid piece on the outermost side in the grid piece set, so that rapid assembly and disassembly of the arc extinguishing structure are achieved, and operation convenience is improved.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, and in particular to an arc-extinguishing structure and contactor for a large-capacity contactor. Background Technology

[0002] A contactor is an electrical device used to frequently connect and disconnect AC / DC circuits and control large-capacity currents over long distances. High-capacity contactors typically employ a grid-type arc-extinguishing chamber. The main arc-extinguishing structure of the chamber consists of a set of arc-extinguishing grids corresponding to a pair of contacts and arc-guiding plates located on the stationary contact. When the moving contact and stationary contact separate (i.e., the circuit is opened), the electric arc generated is immediately transferred to the arc-extinguishing structure, and a long arc is divided into multiple short arcs connected in series by multiple metal plates.

[0003] In conventional arc-extinguishing structures, the arc-extinguishing grid is fixed to the arc-extinguishing chamber housing by riveting. This requires a jig to press the entire unit onto the housing, making assembly complex and disassembly inconvenient. For arc-extinguishing chamber structures on high-capacity (above 100 amps) contactors, the high current during operation leads to frequent switching between the moving and fixed contacts, resulting in frequent arcing and closing actions. This impacts the electrical lifespan of the product, accelerating the damage to the moving and stationary contacts and ultimately rendering the product unusable. Furthermore, because the arc-extinguishing grid in conventional arc-extinguishing structures is difficult to disassemble, discarded contactors are not conducive to waste sorting during recycling. Utility Model Content

[0004] To address the shortcomings of existing production technologies, the applicant provides an arc-extinguishing structure and contactor for high-capacity contactors, thereby enabling rapid assembly and disassembly of the arc-extinguishing structure and improving operational convenience.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An arc-extinguishing structure for a high-capacity contactor, wherein the arc-extinguishing chamber of the contactor includes a base and a housing detachably mounted on the base, the arc-extinguishing structure comprising:

[0007] A grid group, corresponding to a pair of contacts of a contactor, the grid group includes a plurality of grid pieces arranged parallel to each other and spaced apart;

[0008] A grid frame is provided with a set of slots corresponding to the grid assembly, the grid pieces are inserted into the slots, and the grid frame is detachably connected to the housing;

[0009] An arc guide plate is fixedly installed on the base and located on one side of the contact point. A gap is formed between the arc guide plate and the outermost grid piece in the grid plate group.

[0010] As a further improvement to the above technical solution:

[0011] The grid frame includes a frame body with multiple slots and connecting posts. The housing has insertion holes, and the connecting posts are inserted into the insertion holes.

[0012] The connecting column includes a pair of elastic buckles fixedly connected to the frame, with a deformation gap between the two elastic buckles, and a limiting block is provided at the end of each elastic buckle;

[0013] The insertion hole is a through hole. After the elastic buckle undergoes elastic deformation, it moves closer to each other, so that the limiting block passes through the insertion hole and fits against the side wall of the housing at one end of the insertion hole. The frame fits against the side wall of the housing at the other end of the insertion hole.

[0014] The housing is provided with a limiting groove that is aligned with the axial direction of the connecting column. The limiting groove matches the frame and is used to limit the position of the frame in a plane perpendicular to the central axis of the connecting column.

[0015] The depth of the slot is less than the height of the grid member.

[0016] Limiting steps are provided on both sides of the slot, and limiting protrusions are provided on both sides of the grid piece. The limiting protrusions contact the limiting steps to limit the insertion depth of the grid piece in the slot.

[0017] The base is detachably mounted with a wiring terminal corresponding to the contact point, and one end of the wiring terminal is provided with a stationary contact.

[0018] The guide plate is manufactured in one piece. The structure of the guide plate includes a transition plate. One end of the transition plate is bent and extended to form a connecting plate. The other end of the transition plate is bent and extended in the opposite direction to the extension direction of the connecting plate to form a guide plate. The connecting plate and the guide plate are parallel to each other. The angle between the transition plate and the guide plate is an obtuse angle.

[0019] The connecting piece is detachably connected to the terminal block, and the guide piece is located on one side of the stationary contact.

[0020] The terminal block is provided with a positioning structure that mates with the base, which limits the degree of freedom of the terminal block in the direction of the contact surface between the base and the terminal block.

[0021] The positioning structure includes multiple positioning protrusions, and the base is provided with multiple positioning recesses. After the positioning protrusions are inserted into the positioning recesses, they limit the degree of freedom of the contact surface between the base and the terminal block.

[0022] The terminal block has a sheet-like bent structure. The structure of the terminal block includes a wiring segment, a bent segment, and a contact segment along the length direction of the terminal block. The wiring segment is perpendicular to the bent segment, and the contact segment is perpendicular to the bent segment. The wiring segment and the contact segment are parallel to each other and are staggered on both sides of the contact segment.

[0023] Both the arc guide plate and the stationary contact are fixedly connected to the wiring segment, which is located outside the housing.

[0024] A contactor comprising the arc-extinguishing structure for a high-capacity contactor as described above.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model has a compact and reasonable structure and is easy to operate. By inserting multiple grid pieces into the grid frame, and detachably connecting the grid frame to the housing, the grid pieces can be assembled with the grid frame first and then detachably installed on the housing. This facilitates the overall disassembly and replacement of the grid pieces, thereby achieving rapid assembly and disassembly of the arc extinguishing structure and improving the convenience of operation.

[0027] This utility model also has the following advantages:

[0028] (1) When the frame and the shell are connected by plug-in, the connecting column is set as an elastic snap-fit ​​structure. The degree of freedom of the frame along the plug-in direction is restricted by the limiting block at the end of the connecting column and the frame itself. A limiting groove matching the frame is set on the shell to restrict the degree of freedom of the frame to rotate around the connecting column, thereby ensuring the accuracy of the installation position of the grid plate and facilitating the one-time positioning of the plug-in installation.

[0029] (2) In the arc guide plate bending forming structure, the connecting plate and the guiding plate are located on both sides of the transition plate respectively. It uses less material, has a small bending angle, is not easily deformed, is easy to assemble, and is conducive to maintaining a stable arc-starting effect.

[0030] (3) A positioning structure that matches the base is set on the terminal block to facilitate the positioning and installation of the terminal block. This not only makes the relative position of the moving and stationary contacts more accurate, but also facilitates the fixing of the terminal block and prevents the terminal block from swinging during the wiring process. This keeps the position of the stationary contact and the arc guide plate unchanged, ensuring good consistency of the arc extinguishing structure corresponding to each contact, guaranteeing the working effect of the contactor and improving its service life. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model.

[0032] Figure 2 This is a schematic diagram of the installation structure of the grid plate frame of this utility model.

[0033] Figure 3 This is a front view of the casing of this utility model.

[0034] Figure 4 This is a schematic diagram of the assembly structure of the grid frame and grid components of this utility model.

[0035] Figure 5 This is an exploded view of the assembly structure of the grid frame and grid components of this utility model.

[0036] Figure 6 This is a schematic diagram (partial cross-sectional view) of the installation structure of the wiring terminal and arc guide plate of this utility model.

[0037] Figure 7 This is an exploded view showing the installation structure of the wiring terminal and arc guide plate of this utility model.

[0038] Figure 8 This is an exploded view showing the assembly structure of the terminal block and the arc guide plate of this utility model.

[0039] Figure 9 This is an exploded view (another perspective) showing the assembly structure of the terminal block and arc guide plate of this utility model.

[0040] in:

[0041] 1. Cover plate;

[0042] 2. Housing; 21. Insertion hole; 22. Limiting groove;

[0043] 3. Base; 31. Positioning recess;

[0044] 4. Base;

[0045] 5. Grid plate frame; 50. Frame body; 51. Slot; 52. Connecting post; 521. Elastic buckle; 522. Limiting block; 53. Limiting step;

[0046] 6. Grid plate; 61. Limiting protrusion;

[0047] 7. Guide plate; 71. Connecting plate; 72. Transition plate; 73. Guide plate;

[0048] 8. Static contact;

[0049] 9. Terminal block; 91. Positioning protrusion; 92. Wiring section; 93. Bending section; 94. Contact section. Detailed Implementation

[0050] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0051] Example 1:

[0052] like Figures 1-5 As shown, the arc-extinguishing structure for a high-capacity contactor in this embodiment includes a base 3 and a housing 2 detachably mounted on the base 3. The arc-extinguishing structure includes:

[0053] A grid assembly, corresponding to a pair of contacts of a contactor, includes multiple grid pieces 6 arranged parallel to each other and spaced apart;

[0054] The grid frame 5 has a set of slots 51 corresponding to the grid assembly. The grid pieces 6 are inserted into the slots 51. The grid frame 5 is detachably connected to the housing 2.

[0055] The arc guide plate 7 is fixedly installed on the base 3 and located on one side of the contact point. A gap is formed between the arc guide plate 7 and the outermost grid plate 6 in the grid plate group.

[0056] Specifically, both the moving and stationary contact structures are located inside the cavity formed by the housing 2 and the base 3; the number of grid plates is consistent with the number of contact pairs, the grid plate 6 corresponds one-to-one with the slot 51, the grid plate 6 and the arc guide plate 7 are horizontal with the direction of the electric arc generated by the moving and stationary contacts, which is conducive to the rapid segmentation of the electric arc and the extinguishing of the arc. The grid plate group and the arc guide plate 7 form a grid-type arc extinguishing structure.

[0057] Typically, a cover plate 1 is installed on the upper end of the shell 2 of the arc-extinguishing chamber, which serves a decorative purpose while covering the gaps on the shell 2; the base 3 is fixedly installed on the base 4.

[0058] By inserting multiple grid pieces 6 into the grid frame 5, and the grid frame 5 being detachably connected to the housing 2, the grid pieces 6 can be assembled with the grid frame 5 first, and then detachably installed on the housing 2 as a whole. This facilitates the overall disassembly and replacement of the grid pieces 6, thereby enabling the rapid assembly and disassembly of the arc extinguishing structure and improving the convenience of operation.

[0059] The grid plate 6 is made of metal, while the grid plate frame 5, base 3, and housing 2 are made of insulating material, such as plastic. Each set of arc-extinguishing grid plates is easy to disassemble and replace. When the electrical life is over, the grid plate 6 can be quickly separated from the plastic housing by removing the grid plate frame 5, and then the grid plate 6 can be removed from the grid plate frame 5, which is conducive to the environmentally friendly recycling of metal grid plates and plastic parts.

[0060] Example 2:

[0061] Based on Embodiment 1, to facilitate the installation of the grid holder 5 and grid component 6, the arc extinguishing structure for high-capacity contactors in this embodiment, such as... Figure 1 , Figure 5 As shown, the grid frame 5 includes a frame body 50, a plurality of slots 51 are provided on the frame body 50, a connecting post 52 is provided on the frame body 50, and an insertion hole 21 is provided on the housing 2, and the connecting post 52 is inserted into the insertion hole 21.

[0062] Furthermore, such as Figure 1 , Figure 5 As shown, the connecting column 52 includes a pair of elastic buckles 521 that are fixedly connected to the frame 50. There is a deformation gap between the two elastic buckles 521, and a limiting block 522 is provided at the end of each elastic buckle 521.

[0063] The insertion hole 21 is a through hole. After the elastic buckle 521 undergoes elastic deformation, it moves closer to each other, so that the limiting block 522 passes through the insertion hole 21 and fits against the side wall of the housing 2 at one end of the insertion hole 21. The frame 50 fits against the side wall of the housing 2 at the other end of the insertion hole 21.

[0064] The housing 2 is provided with a limiting groove 22 that is consistent with the axial direction of the connecting column 52. The limiting groove 22 matches the frame 50 and is used to limit the position of the frame 50 in the plane perpendicular to the central axis of the connecting column 52.

[0065] When the frame 50 is connected to the housing 2 by plug-in, the connecting post 52 is set as an elastic snap-fit ​​structure. The degree of freedom of the frame 50 along the plug-in direction is restricted by the limiting block 522 at the end of the connecting post 52 and the structure of the frame 50 itself. A limiting groove 22 matching the frame 50 is set on the housing 2 to restrict the degree of freedom of the frame 50 to rotate around the connecting post 52, thereby ensuring the accuracy of the installation position of the grid plate 6 and facilitating one-time positioning of the plug-in installation.

[0066] The connecting column 52 is designed as a convex cap structure that can be detached from the shell 2, which simplifies the connection structure between the frame 50 and the shell 2 and facilitates molding, assembly and disassembly.

[0067] The frame 50 can be made of thermoplastic nylon.

[0068] The depth of the slot 51 is less than the height of the grid piece 6. That is, part of the grid piece 6 is located outside the slot 51, making it convenient to insert and remove the grid piece 6.

[0069] Limiting steps 53 are provided on both sides of the slot 51, and limiting protrusions 61 are provided on both sides of the grid piece 6. The limiting protrusions 61 contact the limiting steps 53 to limit the insertion depth of the grid piece 6 in the slot 51.

[0070] During the insertion process of the grid plate 6 and the slot 51, the grid plate 6 is installed in place when the limiting step 53 and the limiting protrusion 61 come into contact.

[0071] Example 3:

[0072] Based on Embodiment 1, the arc extinguishing structure for high-capacity contactors in this embodiment proposes improvements to the arc guide plate 7.

[0073] like Figure 1 , Figures 6-9As shown, a terminal block 9 corresponding to the contact is detachably installed on the base 3, and a stationary contact 8 is provided at one end of the terminal block 9;

[0074] The guide plate 7 is manufactured in one piece. The structure of the guide plate 7 includes a transition plate 72. One end of the transition plate 72 is bent and extended to form a connecting plate 71. The other end of the transition plate 72 is bent and extended in the opposite direction to the extension direction of the connecting plate 71 to form a guide plate 73. The connecting plate 71 and the guide plate 73 are parallel to each other. The angle between the transition plate 72 and the guide plate 73 is an obtuse angle.

[0075] The connecting piece 71 is detachably connected to the terminal 9, and the guide piece 73 is located on one side of the stationary contact 8.

[0076] Specifically, the connecting piece 71 is detachably connected to the terminal 9 by screws; both the grid piece 6 and the arc guide piece 7 are provided with notches, and the arc guide piece 7 is butterfly-shaped;

[0077] Traditionally, the arc guide plate on the stationary contact side has a large bending angle and is nearly parallel to the connection part and arc guide part of the terminal 9. Because the material is relatively thin, it is easy to deform and requires a lot of material. In the bending structure of the arc guide plate 7 in this embodiment, the connecting piece 71 and the guiding piece 73 are located on both sides of the transition piece 72, respectively. It requires less material, has a small bending angle, is not easy to deform, is easy to assemble, and is conducive to maintaining a stable arc-starting effect.

[0078] Furthermore, the terminal block 9 is provided with a positioning structure that mates with the base 3, which limits the degree of freedom of the terminal block 9 in the direction of the contact surface between the base 3 and the terminal block 9.

[0079] Traditionally, the wiring terminal is fixed to the base 3 by a single screw. If the screw strips, the wiring terminal 9 will rotate during wiring.

[0080] In this embodiment, a positioning structure that cooperates with the base 3 is provided on the terminal block 9 to facilitate the positioning and installation of the terminal block 9. This not only makes the relative position of the moving and stationary contacts 8 and the moving contact more accurate, but also facilitates the fixing of the terminal block 9, preventing the terminal block 9 from swinging during the wiring process. This keeps the position of the stationary contact 8 and the arc guide plate 7 unchanged, ensuring that the arc extinguishing structure corresponding to each contact maintains good consistency, guaranteeing the working effect of the contactor and improving its service life.

[0081] Furthermore, such as Figures 7-9 As shown, the positioning structure includes multiple positioning protrusions 91, and multiple positioning recesses 31 are provided on the base 3. After the positioning protrusions 91 are inserted into the positioning recesses 31, the degree of freedom of the contact surface between the base 3 and the terminal 9 is limited.

[0082] Specifically, there are three positioning protrusions 91 arranged in a triangle to form a stable triangular structure, which effectively prevents the terminal block 9 from rotating and loosening, and better plays a fixing role.

[0083] For high-capacity contactors, the stationary contact 8 has a plate-like structure. The stationary contact 8 and the terminal block 9 are detachably connected. The terminal block 9 and the stationary contact 8 are also installed using the above-mentioned positioning installation method.

[0084] Furthermore, such as Figure 1 , Figure 8 As shown, the terminal 9 has a sheet-like bent structure. The structure of the terminal 9 includes a wiring segment 92, a bent segment 93 and a contact segment 94 along the length direction of the terminal 9. The wiring segment 92 is perpendicular to the bent segment 93, and the contact segment 94 is perpendicular to the bent segment 93. The wiring segment 92 and the contact segment 94 are parallel to each other and are staggered on both sides of the contact segment 94.

[0085] Both the arc guide plate 7 and the stationary contact 8 are fixedly connected to the wiring segment 92, which is located outside the housing 2.

[0086] The wiring terminal 9 is shaped like a Z-bend, which helps to increase the space and facilitates the assembly of the auxiliary terminal cover structure on the side wall of the housing 2.

[0087] Example 4:

[0088] This embodiment proposes a contactor, including the arc-extinguishing structure for a high-capacity contactor as described in any of the above embodiments.

[0089] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An arc-extinguishing structure for a high-capacity contactor, characterized in that: The arc-extinguishing chamber of the contactor includes a base (3) and a housing (2) detachably mounted on the base (3). The arc-extinguishing structure includes: A grid group, corresponding to a pair of contacts of a contactor, the grid group includes a plurality of grid pieces (6) arranged parallel to each other and spaced apart; A grid frame (5) is provided with a set of slots (51) corresponding to the grid assembly. The grid pieces (6) are inserted into the slots (51). The grid frame (5) is detachably connected to the housing (2). The arc guide plate (7) is fixedly installed on the base (3) and located on one side of the contact point. A gap is formed between the arc guide plate (7) and the outermost grid piece (6) of the grid plate group.

2. The arc-extinguishing structure for a high-capacity contactor as described in claim 1, characterized in that: The grid frame (5) includes a frame (50), a plurality of slots (51) are provided on the frame (50), a connecting post (52) is provided on the frame (50), and a socket (21) is provided on the housing (2), and the connecting post (52) is inserted into the socket (21).

3. The arc-extinguishing structure for a high-capacity contactor as described in claim 2, characterized in that: The connecting column (52) includes a pair of elastic buckles (521) fixedly connected to the frame (50), with a deformation gap between the two elastic buckles (521), and a limiting block (522) is provided at the end of each elastic buckle (521). The insertion hole (21) is a through hole. After the elastic buckle (521) undergoes elastic deformation, it moves closer to each other, so that the limiting block (522) passes through the insertion hole (21) and fits against the side wall of the housing (2) at one end of the insertion hole (21). The frame (50) fits against the side wall of the housing (2) at the other end of the insertion hole (21). The housing (2) is provided with a limiting groove (22) that is consistent with the axial direction of the connecting column (52). The limiting groove (22) matches the frame (50) and is used to limit the position of the frame (50) in a plane perpendicular to the central axis of the connecting column (52).

4. The arc-extinguishing structure for a high-capacity contactor as described in claim 2, characterized in that: The depth of the slot (51) is less than the height of the grid piece (6).

5. The arc-extinguishing structure for a high-capacity contactor as described in claim 2, characterized in that: Limiting steps (53) are provided on both sides of the slot (51), and limiting protrusions (61) are provided on both sides of the grid piece (6). The limiting protrusions (61) contact the limiting steps (53) to limit the insertion depth of the grid piece (6) in the slot (51).

6. The arc-extinguishing structure for a high-capacity contactor as described in claim 1, characterized in that: The base (3) is detachably mounted with a wiring terminal (9) corresponding to the contact point, and one end of the wiring terminal (9) is provided with a stationary contact (8); The guide plate (7) is manufactured in one piece. The structure of the guide plate (7) includes a transition plate (72). One end of the transition plate (72) is bent and extended to form a connecting plate (71). The other end of the transition plate (72) is bent and extended in the opposite direction to the extension direction of the connecting plate (71) to form a guide plate (73). The connecting plate (71) and the guide plate (73) are parallel to each other. The angle between the transition plate (72) and the guide plate (73) is an obtuse angle. The connecting piece (71) is detachably connected to the terminal block (9), and the guide piece (73) is located on one side of the stationary contact (8).

7. The arc-extinguishing structure for a high-capacity contactor as described in claim 6, characterized in that: The terminal block (9) is provided with a positioning structure that cooperates with the base (3) to limit the degree of freedom of the terminal block (9) in the direction of the contact surface between the base (3) and the terminal block (9).

8. The arc-extinguishing structure for a high-capacity contactor as described in claim 7, characterized in that: The positioning structure includes multiple positioning protrusions (91), and multiple positioning recesses (31) are provided on the base (3). After the positioning protrusions (91) are inserted into the positioning recesses (31), the degree of freedom of the contact surface between the base (3) and the terminal (9) is limited.

9. The arc-extinguishing structure for a high-capacity contactor as described in claim 6, characterized in that: The terminal block (9) is a sheet-shaped bent structure. The structure of the terminal block (9) includes a wiring segment (92), a bent segment (93) and a contact segment (94) along the length direction of the terminal block (9). The wiring segment (92) is perpendicular to the bent segment (93), and the contact segment (94) is perpendicular to the bent segment (93). The wiring segment (92) and the contact segment (94) are parallel to each other and are staggered on both sides of the contact segment (94). The arc guide plate (7) and the stationary contact (8) are both fixedly connected to the wiring segment (92), which is located outside the housing (2).

10. A contactor, characterized in that: Including the arc-extinguishing structure for high-capacity contactors as described in any one of claims 1-9.

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