Load switch

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and discloses a load switch. The load switch comprises a supporting assembly, a first insulating support and a three-phase contact assembly, the first insulating support comprises a first support body and four first insulating plates, the first support body is connected with the supporting assembly, and the four first insulating plates are arranged on the first support body at intervals in the first direction; first mounting spaces are formed between the adjacent first insulating plates, each phase of contact assembly comprises a moving contact, a static contact and a grounding contact, the moving contact is movably connected with the supporting assembly and can be jointed with the static contact or the grounding contact of the corresponding phase, and each grounding contact is correspondingly mounted in one first mounting space. According to the load switch of the utility model, the inter-phase creepage distance of the grounding contact is increased, it is ensured that the load switch smoothly passes a short-circuit closing capability test, and it is also ensured that the load switch can smoothly ground short-circuit current cut off by a circuit breaker during actual use, thereby avoiding inter-phase breakdown.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a load switch. Background Art

[0002] A load switch is a switching electrical appliance between a circuit breaker and a disconnector, with a simple arc extinguishing device, capable of cutting off the rated load current and a certain overload current, but not capable of cutting off the short-circuit current. Therefore, it is usually used in cooperation with a circuit breaker.

[0003] In order to ensure that after the circuit breaker cuts off the short-circuit current during actual use, the load switch can reliably ground the short-circuit current, it is necessary to conduct a short-circuit closing capacity test on the load switch. During the short-circuit closing capacity test, the moving contact will close with the grounding contact multiple times and a dynamic thermal stability current with a huge current value will be passed through. If interphase creepage occurs between the grounding contacts at this time, resulting in interphase breakdown, problems such as melting of the grounding contacts will occur, and thus the short-circuit closing capacity test cannot be passed. In the prior art, the insulation performance between the grounding contacts of the load switch is poor, and it is easy to have problems that the short-circuit closing capacity test cannot be passed.

[0004] Therefore, there is an urgent need for a load switch to solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a load switch, which increases the interphase creepage distance of the grounding contacts, ensures that it can successfully pass the short-circuit closing capacity test, and also ensures that it can successfully ground the short-circuit current cut off by the circuit breaker during actual use, avoiding interphase breakdown.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A load switch includes a support assembly, a first insulating bracket, and a three-phase contact assembly. The first insulating bracket includes a first bracket body and four first insulating plates. The first bracket body is connected to the support assembly. The four first insulating plates are arranged at intervals in the first direction on the first bracket body. A first installation space is formed between adjacent first insulating plates. Each phase contact assembly includes a moving contact, a static contact, and a grounding contact. The moving contact is movably connected to the support assembly and engages with the corresponding static contact or grounding contact. Each grounding contact is installed in one of the first installation spaces.

[0008] As an optional solution, both ends of the first insulating plate in the second direction have protruding edges, and the protruding edges protrude from the surfaces of both ends of the first bracket body in the second direction.

[0009] As an alternative solution, the first support body is provided with first reinforcing ribs on the surface perpendicular to the second direction, and the first reinforcing ribs intersect with the protruding edge.

[0010] As an alternative solution, the grounding contact is installed on the first surface of the first support body. Convex ribs are respectively arranged at both ends of the first surface along the second direction, and both ends of the convex ribs along the first direction are respectively connected to the corresponding first insulating plates.

[0011] As an alternative solution, the grounding contact includes a connecting portion and a contact portion arranged at an included angle. The connecting portion is installed on the first surface of the first support body, a protruding limiting portion is arranged on the first surface, and the contact portion abuts against the protruding limiting portion;

[0012] The load switch further includes a conductive member. The conductive member includes a pressing portion and a penetrating portion. The cross-sectional area of the pressing portion is larger than that of the penetrating portion. The pressing portion is arranged between the first surface and the connecting portion, and the penetrating portion penetrates through the connecting portion and is used for connecting to the ground wire.

[0013] As an alternative solution, the support assembly includes:

[0014] Two support plates, arranged opposite to each other along the first direction;

[0015] A first cross beam, connected between the two support plates. A sinking groove is arranged on one side of the first support body facing the first cross beam. The first cross beam is in plug-in fit with the sinking groove, and the first support body and the first cross beam are connected by a fastening assembly.

[0016] As an alternative solution, the first support body and the four first insulating plates are integrally injection molded.

[0017] As an alternative solution, the load switch further includes:

[0018] A rotating shaft;

[0019] A second insulating support, which is connected to the support assembly. Three static contacts are installed on the second insulating support at intervals along the first direction;

[0020] A third insulating support, which is connected to the support assembly. Three moving contacts are arranged at intervals along the first direction, and the first end of the moving contact can rotate relative to the third insulating support. The second end is pivotally connected to the rotating shaft, and the third end is configured to engage with the corresponding static contact or grounding contact of the corresponding phase. The first end, the second end, and the third end are not collinear.

[0021] As an alternative solution, the support assembly includes a second cross beam and two support plates. The two support plates are arranged oppositely along a first direction, and two ends of the second cross beam are respectively connected to the two support plates;

[0022] The second insulating bracket includes a second bracket body and four second insulating plates. The second bracket body is connected to the second cross beam. The four second insulating plates are arranged at intervals along the first direction on the second bracket body. A second installation space is formed between two adjacent second insulating plates, and each static contact is installed in one of the second installation spaces.

[0023] As an alternative solution, the support assembly includes a third cross beam and two support plates. The two support plates are arranged oppositely along a first direction, and two ends of the third cross beam are respectively connected to the two support plates;

[0024] The third insulating bracket includes a third bracket body and four third insulating plates. The third bracket body is mainly connected to the third cross beam. The four third insulating plates are arranged at intervals along the first direction on the third bracket body. A third installation space is formed between two adjacent third insulating plates, and a part of each moving contact is arranged in one of the third installation spaces.

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

[0026] For the load switch of the present utility model, by arranging first insulating plates on the first insulating bracket for installing grounding contacts to separate the grounding contacts of each phase, the phase-to-phase creepage distance of the grounding contacts is greatly increased. When the load switch conducts a short-circuit closing capacity test, it can smoothly ground the huge thermal stability current, avoiding phase-to-phase breakdown caused by phase-to-phase creepage and avoiding the problem of melting of the grounding contacts, so that the load switch can smoothly pass the short-circuit closing capacity test; and when the load switch is actually in use, after the circuit breaker cuts off the short-circuit current, it can smoothly ground the short-circuit current, avoiding phase-to-phase breakdown caused by phase-to-phase creepage and avoiding the problem of melting of the grounding contacts, thereby improving the service life of the load switch. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram when the moving contact and the static contact of the load switch provided by the specific embodiment of the present utility model are engaged;

[0028] Figure 2 is a schematic structural diagram when the moving contact and the grounding contact of the load switch provided by the specific embodiment of the present utility model are engaged;

[0029] Figure 3 is an exploded view of the components near the grounding contact provided by the specific embodiment of the present utility model;

[0030] Figure 4 It is a schematic structural diagram of the first insulating bracket provided by the specific embodiment of the present utility model;

[0031] Figure 5 It is a schematic structural diagram of the cooperation of the second insulating bracket, the static contact and the arc extinguishing component provided by the specific embodiment of the present utility model.

[0032] In the figure:

[0033] 10. Support assembly; 11. Support plate; 12. First cross beam; 121. Second threaded hole; 13. Second cross beam; 14. Third cross beam;

[0034] 21. Moving contact; 211. First connecting rod; 212. Second connecting rod; 213. Extension piece; 214. First end; 215. Second end; 216. Third end; 217. Wiring terminal; 22. Static contact; 23. Grounding contact; 231. Connecting part; 232. Contact part; 24. Conductive part; 241. Pressing part; 242. Penetrating part;

[0035] 30. First insulating bracket; 31. First bracket main body; 311. Sunk groove; 312. Weight reduction cavity; 313. First threaded hole; 314. Limit groove; 32. First insulating plate; 321. Protruding edge; 33. First reinforcing rib; 34. Rib; 35. Protruding limit part; 361. Rib plate; 362. Inclined rib; 363. Short rib;

[0036] 40. Second insulating bracket; 41. Avoidance groove;

[0037] 50. Third insulating bracket;

[0038] 60. Rotating shaft;

[0039] 70. Arc extinguishing component;

[0040] 81. First fastening component; 82. Second fastening component; 83. Third fastening component. Specific embodiments

[0041] The present utility model will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] This embodiment provides a load switch, such as Figure 1 and Figure 2As shown, the load switch includes a support assembly 10, a three-phase contact assembly, and an arc extinguishing assembly 70. The three-phase contact assembly is mounted on the support assembly 10. Each phase of the contact assembly includes a moving contact 21, a static contact 22, and a grounding contact 23. The moving contact 21 is movably connected to the support assembly 10, and the contact end of the moving contact 21 can move between a closing position, an opening position, and a grounding position, thereby switching the state of the load switch. In the closing position, the contact end of the moving contact 21 engages with the static contact 22, and the circuit is conducted; in the opening position, the contact end of the moving contact 21 does not contact the static contact 22 nor the grounding contact 23, and the circuit is disconnected; in the grounding position, the contact end of the moving contact 21 engages with the grounding contact 23, and the circuit is grounded. The arc extinguishing assembly 70 is directly or spacedly connected to the support assembly 10 and is used for extinguishing the arc generated by the closing and opening of the moving contact 21 and the static contact 22. On the basis of not violating the inventive concept of the present application, the arc extinguishing assembly 70 can be any one in the prior art, and its structure and connection relationship will not be elaborated herein.

[0046] As Figure 2 shown, the load switch further includes a first insulating bracket 30, a second insulating bracket 40, a third insulating bracket 50, and a rotating shaft 60. The first insulating bracket 30 is connected to the support assembly 10. The three grounding contacts 23 are spacedly mounted on the first insulating bracket 30 along a first direction. The second insulating bracket 40 is connected to the support assembly 10, and the three static contacts 22 are spacedly mounted on the second insulating bracket 40 along the first direction. The rotating shaft 60 extends along the first direction and is pivotally connected to the support assembly 10, and the third insulating bracket 50 is mounted on the support assembly 10. The three moving contacts 21 are spacedly arranged along the first direction, and each moving contact 21 has a first end 214, a second end 215, and a third end 216, and the first end 214, the second end 215, and the third end 216 are not collinear. The first end 214 of the moving contact 21 can rotate relative to the third insulating bracket 50, the second end 215 of the moving contact 21 is pivotally connected to the rotating shaft 60, and the third end 216 of the moving contact 21 is the contact end of the moving contact 21. When the rotating shaft 60 rotates, the third end 216 can move between a closing position where it engages with the static contact 22 of the corresponding phase, a grounding position where it engages with the grounding contact 23 of the corresponding phase, and an opening position located between the static contact 22 and the moving contact 21 of the corresponding phase.

[0047] In this embodiment, the support assembly 10 includes two support plates 11, a first cross beam 12, a second cross beam 13, and a third cross beam 14. Among them, the two support plates 11 are arranged at intervals in the first direction. The first cross beam 12 extends in the first direction and its two ends are respectively connected to the two support plates 11. The first insulating bracket 30 also extends in the first direction and is installed on the first cross beam 12. The second cross beam 13 extends in the first direction and its two ends are respectively connected to the two support plates 11. The second insulating bracket 40 also extends in the first direction and is installed on the second cross beam 13. The third cross beam 14 extends in the first direction and its two ends are respectively connected to the two support plates 11. The third insulating bracket 50 also extends in the first direction and is installed on the third cross beam 14. Optionally, the two ends of the first cross beam 12, the two ends of the second cross beam 13, and the two ends of the third cross beam 14 can be fixed to the corresponding support plates 11 by means of plugging, fastening with fasteners, etc., and no specific limitation is made here.

[0048] As Figure 2 shown, the moving contact 21 further includes a wiring terminal 217, a first connecting rod 211, a second connecting rod 212, and an extension member 213. Among them, the wiring terminal 217 is connected to the third insulating bracket 50. One end of the first connecting rod 211 forms the first end 214 of the moving contact 21 and is pivotally connected to the wiring terminal 217. The other end of the first connecting rod 211 forms the third end 216 of the moving contact 21. The extension member 213 is connected to the middle of the first connecting rod 211. One end of the second connecting rod 212 forms the second end 215 of the moving contact 21 and is pivotally connected to the rotating shaft 60. The other end of the second connecting rod 212 is pivotally connected to the extension member 213. Through the above arrangement, when the rotating shaft 60 rotates, the third end 216 of the moving contact 21 can move between the closing position, the opening position, and the grounding position.

[0049] In order to ensure that the load switch can reliably ground the short-circuit current after the circuit breaker cuts off the short-circuit current during actual use, it is necessary to conduct a short-circuit closing capacity test on the load switch. During the short-circuit closing capacity test, the moving contact 21 will be closed with the grounding contact 23 multiple times, and a huge dynamic and thermal stability current will be passed through. If interphase creepage occurs between the grounding contacts 23 at this time, resulting in interphase breakdown, problems such as melting of the grounding contacts 23 will occur, and then the short-circuit closing capacity test cannot be passed. In the prior art, the insulation performance between the grounding contacts 23 of the load switch is poor, and it is easy to have problems that the short-circuit closing capacity test cannot be passed.

[0050] Regarding this, as Figure 1 and Figure 2As shown, the first insulating support 30 includes a first support body 31 and four first insulating plates 32. In this embodiment, the first support body 31 extends along the first direction and is connected to the first cross beam 12. The four first insulating plates 32 are arranged on the first support body 31 at intervals along the first direction, and a first installation space is formed between adjacent first insulating plates 32. Each grounding contact 23 is correspondingly installed in a first installation space. In the load switch of this embodiment, by arranging the first insulating plates 32 on the first insulating support 30 where the grounding contacts 23 are installed, the grounding contacts 23 of each phase are separated, thereby greatly increasing the phase-to-phase creepage distance of the grounding contacts 23, enabling the load switch to smoothly ground the huge thermal stability current with a large current value during the short-circuit closing capacity test, avoiding phase-to-phase breakdown caused by phase-to-phase creepage, avoiding the problem of melting of the grounding contacts 23, and enabling the load switch to successfully pass the short-circuit closing capacity test; and enabling the load switch to smoothly ground the short-circuit current after the circuit breaker cuts off the short-circuit current during actual use, avoiding phase-to-phase breakdown caused by phase-to-phase creepage, avoiding the problem of melting of the grounding contacts 23, and improving the service life of the load switch.

[0051] In this embodiment, the first support body 31 is generally constructed as a cuboid. The first support body 31 includes a first surface, and the grounding contact 23 is installed on the first surface, and the first surface is parallel to the first direction. Define the direction parallel to the first surface and perpendicular to the first direction as the second direction. As Figure 2 and Figure 3 shown, both ends of the first insulating plate 32 along the second direction have protruding edges 321, and the protruding edges 321 protrude from the surfaces at both ends of the first support body 31 along the second direction. The setting of the protruding edges 321 increases the contact range between the first insulating plate 32 and the first support body 31, thereby improving the connection strength between the first insulating plate 32 and the first support body 31, enabling the first insulating plate 32 to withstand greater electrodynamic force.

[0052] As Figure 3 shown, first reinforcing ribs 33 are provided on the surface of the first support body 31 perpendicular to the second direction. In this embodiment, the first reinforcing ribs 33 extend along the first direction and intersect with the protruding edges 321. The first reinforcing ribs 33 play a role in supporting the first insulating plate 32, thereby further increasing the connection structural strength of the first insulating plate 32 and also increasing the structural strength of the entire first insulating support 30. In this embodiment, first reinforcing ribs 33 are provided on both side surfaces of the first support body 31 perpendicular to the second direction. On each side surface, the first reinforcing ribs 33 are sequentially connected to the four first insulating plates 32, that is to say, the three first reinforcing ribs 33 located between adjacent two first insulating plates 32 are collinearly arranged. In other embodiments, on each side surface, the three first reinforcing ribs 33 respectively located between adjacent two first insulating plates 32 may also be arranged non-collinearly.

[0053] As shown Figure 3 in FIG. 1, the grounding contact 23 is mounted on the first surface of the first bracket body 31. Ribs 34 are respectively arranged at both ends of the first surface along the second direction, and both ends of the ribs 34 along the first direction are respectively connected to the corresponding first insulating plates 32. On the one hand, the ribs 34 play a supporting role for the first insulating plate 32, thereby further improving the connection strength between the first insulating plate 32 and the first bracket body 31; on the other hand, the ribs 34, the first insulating plate 32 and the first surface form a groove structure, which can better wrap the grounding contact 23, thereby further increasing the phase-to-phase creepage distance between the grounding contacts 23.

[0054] As shown Figure 1 in FIGS. 2 Figure 3 and 3, the grounding contact 23 is generally L-shaped and includes a connecting portion 231 and a contact portion 232 arranged at an angle. The connecting portion 231 is connected to the first insulating bracket 30, and the contact portion 232 is used to engage with the moving contact 21. In this embodiment, the connecting portion 231 is fixed to the first surface by the first fastening assembly 81. Specifically, the first fastening assembly 81 includes a bolt. A through hole is provided on the connecting portion 231, and a first threaded hole 313 is provided on the first bracket body 31. The bolt passes through the through hole and is threadedly connected to the first threaded hole 313.

[0055] As shown Figure 3 in FIG. 4, a convex limiting portion 35 is provided on the first surface, and the contact portion 232 abuts against the convex limiting portion 35. By providing the convex limiting portion 35, not only can the grounding contact 23 be positioned when the grounding contact 23 is installed, but also the connecting portion 231 can be supported, thereby increasing the maximum electrodynamic force that the grounding contact 23 can withstand. In this embodiment, the concave-convex condition of the surface of the convex limiting portion 35 facing the grounding contact 23 matches the concave-convex condition of the corresponding position of the grounding contact 23, so that the convex limiting portion 35 can better fit with the grounding contact 23.

[0056] To realize the connection between the grounding contact 23 and the ground wire, the load switch of this embodiment further includes a conductive member 24, and each grounding contact 23 is correspondingly connected to a conductive member 24. As shown Figure 3As shown, the conductive member 24 includes a pressing portion 241 and a penetrating portion 242. The cross-sectional area of the pressing portion 241 is larger than that of the penetrating portion 242. The pressing portion 241 is disposed between the first surface and the connecting portion 231. The penetrating portion 242 penetrates through the connecting portion 231 and is used to connect to the ground wire. Specifically, the ground wire can be hooked or wound and fixed on the penetrating portion 242. By sandwiching the pressing portion 241 between the first surface and the connecting portion 231, the conductive member 24 of this embodiment can be fixed while the grounding contact 23 is fixed on the first surface by the first fastener. It not only has a simple structure but also is convenient for assembly. Optionally, the conductive member 24 can be a bolt. The bolt is a standard part with low cost, and thus the manufacturing cost of the load switch can be reduced.

[0057] Optionally, as Figure 3 shown, a limiting groove 314 is provided on the first surface. The pressing portion 241 is in plug-in fit with the limiting groove 314. Such a setting can not only position the conductive member 24 but also help ensure a better fit between the connecting portion 231 and the first surface, guaranteeing the firmness of the installation of the grounding contact 23. In this embodiment, the shapes of the limiting groove 314 and the pressing portion 241 are the same and non-circular, so as to prevent the conductive member 24 from rotating. In other embodiments, a limiting groove 314 can also be provided on the surface of the connecting portion 231 of the grounding contact 23 facing the first surface to position the pressing portion 241. In another embodiment, limiting grooves 314 can be provided on both the surface of the connecting portion 231 of the grounding contact 23 facing the first surface and the first surface, and no specific limitation is made here.

[0058] To realize the connection between the first insulating bracket 30 and the first crossbeam 12, as Figure 3 and Figure 4As shown, a sunk groove 311 is provided on one side of the first bracket body 31 facing the first cross beam 12. The first cross beam 12 is inserted and matched with the sunk groove 311, and the first bracket body 31 and the first cross beam 12 are connected by a fastening component. Through the insertion and matching of the sunk groove 311 and the first cross beam 12, the installation accuracy of the grounding contact 23 on the first insulating bracket 30 can be ensured. Optionally, the fastening component includes a second fastening component 82. The second fastening component 82 includes a bolt and a nut. The bolt sequentially passes through the first cross beam 12 and the first bracket body 31, and the nut is in threaded cooperation with the bolt, so that the first insulating bracket 30 can be fixed on the first cross beam 12. In this embodiment, the second fastening component 82 includes two sets of bolts and nuts, and the two sets of bolts and nuts are respectively arranged at both ends of the first insulating bracket 30 along the first direction. In other embodiments, the number of bolts and nuts can be flexibly set. Preferably, the fastening component further includes a third fastening component 83. The third fastening component 83 includes a bolt. A second threaded hole 121 is provided on the first cross beam 12. After passing through the first bracket body 31, the third fastening component 83 is in threaded connection with the second threaded hole 121. By providing the third fastening component 83, the connection strength between the first insulating bracket 30 and the first cross beam 12 is improved. Optionally, the third fastening component 83 includes two bolts. In other embodiments, the number of the third fastening components 83 can be flexibly set.

[0059] As Figure 4 shown, a weight reduction cavity 312 is provided on the bottom surface of the sunk groove 311. By providing the weight reduction cavity 312, the material usage of the first insulating bracket 30 can be reduced, which can not only reduce the manufacturing cost, but also reduce the total weight of the load switch. In this embodiment, a second reinforcing rib is provided in the weight reduction cavity 312. By providing the second reinforcing rib, the structural strength of the first insulating bracket 30 is ensured while reducing the weight. Optionally, the second reinforcing rib may include a rib plate 361 whose two ends along the second direction are respectively connected to the side wall of the weight reduction cavity 312. The second reinforcing rib may further include an inclined rib 362 located between the side wall and the bottom plate of the weight reduction cavity 312. The second reinforcing rib may further include a short rib 363 provided on the side wall of the weight reduction cavity 312, which is not specifically limited herein.

[0060] In this embodiment, the bracket body 31, the four insulating plates 32, the first reinforcing rib 33, the convex rib 34, and the second reinforcing rib of the first insulating bracket 30 are all integrally injection molded. Not only is the process simple, but the first insulating bracket 30 has better structural strength.

[0061] As Figure 2As shown, the structure of the second insulating bracket 40 is basically the same as that of the first insulating bracket 30. Specifically, the second insulating bracket 40 includes a second bracket body and four second insulating plates. The second bracket body is connected to the second cross beam 13, and the four second insulating plates are arranged on the second bracket body at intervals in the first direction. A second installation space is formed between two adjacent second insulating plates, and each static contact 22 is installed in a second installation space. Thereby, the phase-to-phase creepage distance between the static contacts 22 can be increased to avoid phase-to-phase short circuit. The first insulating bracket 30 and the second insulating bracket 40 adopting the same structure can reduce the design cost and manufacturing cost of the load switch. In this embodiment, the basic structure of the static contact 22 is the same as that of the grounding contact 23, so the connection manner between the static contact 22 and the second insulating bracket 40 is the same as the connection manner between the grounding contact 23 and the first insulating bracket 30.

[0062] In some embodiments, as Figure 5 shown, since the arc extinguishing assembly 70 is connected to the static contact 22, an avoidance groove 41 for avoiding the arc extinguishing assembly 70 is provided on the second insulating bracket 40.

[0063] As Figure 2 shown, the structure of the third insulating bracket 50 is the same as that of the first insulating bracket 30. Specifically, the third insulating bracket includes a third bracket body and four third insulating plates. The third bracket body is connected to the third cross beam, and the four third insulating plates are arranged on the third bracket body at intervals in the first direction. A third installation space is formed between two adjacent third insulating plates, and a partial structure of each moving contact 21 is correspondingly arranged in a third installation space. Thereby, the phase-to-phase creepage distance between the moving contacts 21 can be increased to avoid phase-to-phase short circuit. And the third insulating bracket 50 and the first insulating bracket 30 adopting the same structure can reduce the design cost and manufacturing cost of the load switch. In this embodiment, the structure of the terminal 217 is substantially the same as that of the grounding contact 23, so the connection manner between the terminal 217 and the third insulating bracket 50 is the same as the connection manner between the grounding contact 23 and the first insulating bracket 30.

[0064] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Load switch, characterized in that: The invention comprises a support assembly (10), a first insulating support (30) and a three-phase contact assembly, wherein the first insulating support (30) comprises a first support body (31) and four first insulating plates (32), the first support body (31) is connected to the support assembly (10), the four first insulating plates (32) are arranged on the first support body (31) at intervals along a first direction, and a first installation space is formed between adjacent first insulating plates (32), and each phase contact assembly comprises a moving contact (21), a stationary contact (22) and a grounding contact (23), the moving contact (21) is movably connected to the support assembly (10) and engaged with a corresponding stationary contact (22) or a grounding contact (23), and each of the grounding contacts (23) is installed in one of the first installation spaces.

2. The load switch according to claim 1, characterized in that: The first insulating plate (32) has protruding edges (321) at both ends along the second direction, and the protruding edges (321) protrude from surfaces at both ends of the first bracket body (31) along the second direction.

3. The load switch according to claim 2, characterized in that: A first reinforcing rib (33) is provided on a surface of the first bracket body (31) perpendicular to the second direction, and the first reinforcing rib (33) intersects with the protruding edge (321).

4. The load switch according to claim 1, characterized in that: The grounding contact (23) is mounted on a first surface of the first bracket body (31), and convex ribs (34) are respectively provided at two ends of the first surface along the second direction, and the two ends of the convex ribs (34) along the first direction are respectively connected to the corresponding first insulating plate (32).

5. The load switch according to claim 1, characterized in that: The grounding contact (23) comprises a connecting portion (231) and a contact portion (232) arranged at an angle, the connecting portion (231) being mounted on a first surface of the first bracket body (31), a protruding limiting portion (35) being arranged on the first surface, and the contact portion (232) abutting against the protruding limiting portion (35); The load switch further comprises a conductive member (24), the conductive member (24) comprising a pressing portion (241) and a penetration portion (242), the pressing portion (241) having a cross-sectional area greater than a cross-sectional area of ​​the penetration portion (242), the pressing portion (241) being arranged between the first surface and the connecting portion (231), the penetration portion (242) penetrating the connecting portion (231) and being used for connecting a ground wire.

6. The load switch according to claim 1, characterized in that: The support assembly (10) comprises: Two support plates (11) are arranged opposite to each other along a first direction; The first cross beam (12) is connected between the two support plates (11); a sink groove (311) is provided on the side of the first bracket body (31) facing the first cross beam (12); the first cross beam (12) is plug-fitted into the sink groove (311); and the first bracket body (31) is connected to the first cross beam (12) via a fastening assembly.

7. The load switch according to claim 1, characterized in that: The first bracket body (31) and the four first insulating plates (32) are integrally injection-molded.

8. The load switch according to any one of claims 1 to 7, characterized in that: The load switch also includes: A rotating shaft (60); A second insulating support (40), the second insulating support (40) being connected to the support assembly (10), and the three stationary contacts (22) being installed on the second insulating support (40) at intervals along a first direction; A third insulating bracket (50), wherein the third insulating bracket (50) is connected to the supporting assembly (10), the three moving contacts (21) are arranged at intervals along the first direction, and the first end (214) of the moving contact (21) can rotate relative to the third insulating bracket (50), the second end (215) is pivotally connected to the rotating shaft (60), and the third end (216) is configured to engage with the stationary contact (22) or the grounding contact (23) of the corresponding phase, and the first end (214), the second end (215) and the third end (216) are not collinear.

9. The load switch according to claim 8, characterized in that: The support assembly (10) comprises a second crossbeam (13) and two support plates (11), the two support plates (11) are arranged opposite to each other along a first direction, and two ends of the second crossbeam (13) are respectively connected to the two support plates (11); The second insulating support (40) comprises a second support body and four second insulating plates, the second support body is connected to the second crossbeam (13), the four second insulating plates are arranged on the second support body at intervals along a first direction, a second installation space is formed between two adjacent second insulating plates, and each of the static contacts (22) is installed in one of the second installation spaces.

10. The load switch according to claim 8, characterized in that: The support assembly (10) comprises a third crossbeam (14) and two support plates (11), the two support plates (11) are arranged opposite to each other along a first direction, and two ends of the third crossbeam (14) are respectively connected to the two support plates (11); The third insulating support (50) comprises a third support body and four third insulating plates. The third support is mainly connected to the third crossbeam (14). The four third insulating plates are arranged on the third support body at intervals along the first direction. A third installation space is formed between two adjacent third insulating plates. A partial structure of each moving contact (21) is correspondingly arranged in one of the third installation spaces.

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