Contact system and automatic transfer switch

Abstract

This utility model belongs to the field of low-voltage electrical appliance technology and discloses a contact system and an automatic transfer switch. The contact system includes a housing and a contact assembly. The contact assembly includes a first stationary contact, a second stationary contact, and a moving contact disposed on the housing. The housing contains a first arc-extinguishing chamber and a second arc-extinguishing chamber. By providing corresponding arc-extinguishing chambers for the first and second stationary contacts, at least a portion of the first end of the moving contact corresponding to the first stationary contact is located within the first arc-extinguishing chamber, and at least a portion of the second end of the moving contact corresponding to the second stationary contact is located within the second arc-extinguishing chamber. Corresponding exhaust channels communicating with the arc-extinguishing chambers are provided, allowing energy generated on the first side to enter the first exhaust channel from the first arc-extinguishing chamber and be discharged through two first exhaust ports, and energy generated on the second side to enter the second exhaust channel from the second arc-extinguishing chamber and be discharged through two second exhaust ports. This avoids energy accumulation inside the housing, improves energy discharge efficiency, and effectively enhances the arc-extinguishing effect and equipment reliability.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a contact system and an automatic transfer switch. Background Technology

[0002] An automatic transfer switch is a critical electrical device used in emergency power supply systems. It can automatically switch to power supply II when power supply I fails, thereby ensuring continuous power supply to the load.

[0003] In the prior art, the contact system, as an important component of automatic transfer switchgear, generates a high level of arc and energy when connecting and disconnecting large currents. The energy generated between the moving and stationary contacts cannot be discharged in time, which will affect the arc extinguishing effect and equipment reliability.

[0004] In other words, the existing contact system has the disadvantage that energy cannot be discharged in time between the moving and stationary contacts, which affects the arc extinguishing effect and equipment reliability. Utility Model Content

[0005] The purpose of this invention is to provide a contact system and an automatic transfer switch, which is designed with a first exhaust channel and a second exhaust channel to allow the energy generated between the moving and stationary contacts to be discharged in a timely manner, thereby effectively improving the arc extinguishing effect and equipment reliability.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a contact system, including a housing and a contact assembly. The contact assembly includes a first stationary contact, a second stationary contact, and a moving contact disposed on the housing. The housing contains a first arc-extinguishing chamber and a second arc-extinguishing chamber. The first arc-extinguishing chamber corresponds to the first stationary contact, and the second arc-extinguishing chamber corresponds to the second stationary contact. At least a portion of the first end of the moving contact corresponding to the first stationary contact is located within the first arc-extinguishing chamber, and at least a portion of the second end of the moving contact corresponding to the second stationary contact is located within the second arc-extinguishing chamber. The housing contains a first exhaust channel communicating with the first arc-extinguishing chamber and a second exhaust channel communicating with the second arc-extinguishing chamber. The two ends of the first exhaust channel form first exhaust ports communicating with the outside on the two side walls of the housing, and the two ends of the second exhaust channel form second exhaust ports communicating with the outside on the two side walls of the housing.

[0008] As an optional technical solution for the contact system, the housing is provided with a partition, which isolates the first exhaust channel and the second exhaust channel.

[0009] As an optional technical solution for the contact system, the housing is provided with a first cavity for accommodating the first side terminal, one end of the first exhaust channel is connected to the outside via the first exhaust port and the first cavity, and the other end of the first exhaust port is directly connected to the outside.

[0010] As an optional technical solution for the contact system, the housing is provided with a second cavity and a load cavity. The second cavity is used to accommodate the second side terminal, and the load cavity is used to accommodate the load side terminal. The second cavity and the load cavity are located on both sides of the housing, and the two second exhaust ports are connected to the outside through the second cavity and the load cavity, respectively.

[0011] As an optional technical solution for the contact system, the first arc-extinguishing chamber is disposed inside the first exhaust channel, the second arc-extinguishing chamber is disposed inside the second exhaust channel, the first stationary contact portion extends into the first exhaust channel, the second stationary contact portion extends into the second exhaust channel, the moving contact is rotatably disposed on the housing, the rotation of the moving contact drives the first end of the moving contact to move in the first exhaust channel, and drives the second end of the moving contact to move in the second exhaust channel, so as to communicate or separate with the corresponding first stationary contact or second stationary contact.

[0012] As an optional technical solution for the contact system, both the first arc-extinguishing chamber and the second arc-extinguishing chamber are provided with an arc-initiating angle, which is used to introduce the electric arc into the corresponding first arc-extinguishing chamber or second arc-extinguishing chamber.

[0013] As an optional technical solution for the contact system, the arc-drawing angle extends toward the direction of the corresponding first stationary contact or the second stationary contact.

[0014] As an optional technical solution for the contact system, the first arc-extinguishing chamber includes two first support plates and a first arc-extinguishing grid plate connected between the two first support plates. Multiple first arc-extinguishing grid plates are arranged at intervals, and the arc-inducing angle is provided on one of the first arc-extinguishing grid plates near the first stationary contact.

[0015] And / or, the second arc-extinguishing chamber includes two second support plates and a second arc-extinguishing grid plate connected between the two second support plates. Multiple second arc-extinguishing grid plates are arranged at intervals, and the arc-inducing angle is provided on one of the second arc-extinguishing grid plates near the second stationary contact.

[0016] As an optional technical solution for the contact system, the arc-inducing angle is formed by bending the first arc-extinguishing grid plate or the second arc-extinguishing grid plate.

[0017] This utility model provides an automatic transfer switch electrical appliance, including the contact system described above.

[0018] Beneficial effects:

[0019] This utility model provides a contact system, which includes a housing and a contact assembly. The contact assembly includes a first stationary contact, a second stationary contact, and a moving contact disposed on the housing. The housing contains a first arc-extinguishing chamber and a second arc-extinguishing chamber. The first arc-extinguishing chamber is disposed corresponding to the first stationary contact, and the second arc-extinguishing chamber is disposed corresponding to the second stationary contact. At least a portion of the first end of the moving contact corresponding to the first stationary contact is located within the first arc-extinguishing chamber, and at least a portion of the second end of the moving contact corresponding to the second stationary contact is located within the second arc-extinguishing chamber. The housing contains a first exhaust channel communicating with the first arc-extinguishing chamber and a second exhaust channel communicating with the second arc-extinguishing chamber. The two ends of the first exhaust channel form first exhaust ports communicating with the outside on the two side walls of the housing, and the two ends of the second exhaust channel form second exhaust ports communicating with the outside on the two side walls of the housing, respectively. By providing corresponding arc-extinguishing chambers for the first and second stationary contacts, the first end of the moving contact corresponding to the first stationary contact is at least partially located within the first arc-extinguishing chamber, and the second end of the moving contact corresponding to the second stationary contact is at least partially located within the second arc-extinguishing chamber. Corresponding exhaust channels communicating with the arc-extinguishing chambers are provided. The two ends of the first exhaust channel form first exhaust ports communicating with the outside on the two side walls of the housing, allowing the energy generated between the moving and stationary contacts on the first side to enter the first exhaust channel from the first arc-extinguishing chamber and be discharged through the two first exhaust ports. Similarly, the two ends of the second exhaust channel form second exhaust ports communicating with the outside on the two side walls of the housing, allowing the energy generated between the moving and stationary contacts on the second side to enter the second exhaust channel from the second arc-extinguishing chamber and be discharged through the two second exhaust ports. This avoids energy accumulation inside the housing, improves energy discharge efficiency, and effectively enhances the arc-extinguishing effect and equipment reliability.

[0020] This utility model provides an automatic transfer switch, including the contact system described above. By setting the contact system, the automatic transfer switch is guaranteed to have reliable arc extinguishing capability. Attached Figure Description

[0021] Figure 1 This is a partial structural schematic diagram of the contact system provided in an embodiment of the present invention from a first-view perspective;

[0022] Figure 2 This is a partial structural schematic diagram of the outer shell provided in an embodiment of the present utility model;

[0023] Figure 3 This is a partial structural schematic diagram of the contact system provided in an embodiment of the present invention from a second perspective;

[0024] Figure 4 This is a schematic diagram of the structure of the first arc-extinguishing grid and the first support plate provided in this embodiment of the utility model.

[0025] In the picture:

[0026] 10. Outer shell; 11. First arc-extinguishing chamber; 111. First support plate; 112. First arc-extinguishing grid plate; 113. First arc-extinguishing channel; 12. First exhaust channel; 121. First exhaust port; 131. Positioning post; 132. Positioning sleeve; 14. Second arc-extinguishing chamber; 141. Second support plate; 142. Second arc-extinguishing grid plate; 15. Second exhaust channel; 151. Second exhaust port; 17. Arc-starting angle; 18. Partition plate;

[0027] 191. First cavity; 192. Second cavity; 193. Load cavity;

[0028] 21. First stationary contact; 22. Second stationary contact; 23. Moving contact;

[0029] 31. First side terminal; 32. Second side terminal; 33. Load side terminal. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] like Figures 1 to 4 As shown, this embodiment provides a contact system, which includes a housing 10 and a contact assembly. The contact assembly includes a first stationary contact 21, a second stationary contact 22, and a moving contact 23 disposed on the housing 10. The housing 10 has a first arc-extinguishing chamber 11 and a second arc-extinguishing chamber 14. The first arc-extinguishing chamber 11 is correspondingly disposed to the first stationary contact 21, and the second arc-extinguishing chamber 14 is correspondingly disposed to the second stationary contact 22. The first end of the moving contact 23 corresponding to the first stationary contact 21 is at least partially located in the first arc-extinguishing chamber 11, and the second end of the moving contact 23 corresponding to the second stationary contact 22 is at least partially located in the second arc-extinguishing chamber 14. The housing 10 has a first exhaust channel 12 communicating with the first arc-extinguishing chamber 11 and a second exhaust channel 15 communicating with the second arc-extinguishing chamber 14. The two ends of the first exhaust channel 12 form first exhaust ports 121 communicating with the outside on the two side walls of the housing 10, and the two ends of the second exhaust channel 15 form second exhaust ports 151 communicating with the outside on the two side walls of the housing 10.

[0035] By providing corresponding arc-extinguishing chambers for the first stationary contact 21 and the second stationary contact 22, the first end of the moving contact 23 corresponding to the first stationary contact 21 is at least partially located in the first arc-extinguishing chamber 11, and the second end of the moving contact 23 corresponding to the second stationary contact 22 is at least partially located in the second arc-extinguishing chamber 14. A first exhaust channel 12 communicating with the first arc-extinguishing chamber 11 and a second exhaust channel 15 communicating with the second arc-extinguishing chamber 14 are provided. The two ends of the first exhaust channel 12 form first exhaust ports 121 communicating with the outside on both sides of the outer casing 10, thereby ensuring that the moving and stationary contacts on the first side (i.e., the moving contact 23 and...) are connected. The energy generated by the first stationary contact 21 can enter the first exhaust channel 12 from the first arc-extinguishing chamber 11 and be discharged through the two first exhaust ports 121. The two ends of the second exhaust channel 15 form second exhaust ports 151 that communicate with the outside on the two side walls of the outer casing 10. The energy generated between the second moving and stationary contacts (i.e., the moving contact 23 and the second stationary contact 22) can enter the second exhaust channel 15 from the second arc-extinguishing chamber 14 and be discharged through the two second exhaust ports 151, thus avoiding energy accumulation inside the outer casing 10, improving energy discharge efficiency, and thereby effectively improving the arc-extinguishing effect and equipment reliability.

[0036] In this embodiment, both the first exhaust channel 12 and the second exhaust channel 15 extend along the length of the outer casing 10; the first exhaust channel 12 is located at the bottom of the outer casing 10, and the second exhaust channel 15 is located at the top of the outer casing 10.

[0037] Furthermore, the outer casing 10 is provided with a first cavity 191 for accommodating the first side terminal 31. One end of the first exhaust channel 12 is connected to the outside via the first exhaust port 121 and the first cavity 191, and the other end of the first exhaust port 121 is directly connected to the outside. By providing a first cavity 191 on the outer casing 10, a first side terminal 31 is provided. The first cavity 191 has an opening for wiring. The first side terminal 31 is fixedly connected to the first stationary contact 21 by bolts, which can reduce the contact resistance. At the same time, a first exhaust port 121 of the first exhaust channel 12 is connected to the outside through the opening of the first cavity 191, which indirectly uses the opening for wiring in the first cavity 191 as the outlet for the first exhaust channel 12 to communicate with the outside. Therefore, there is no need to open other holes, which can reduce the number of openings on the outer casing 10, simplify the design, and reduce the complexity of the outer casing 10. In addition, the location of the first side terminal 31 usually has a dustproof and waterproof design, with a good protection level. The first cavity 191 serves both as the setting function of the first side terminal 31 and the function of the exhaust outlet, which can play a certain protective role and prevent external impurities from entering.

[0038] Furthermore, the outer casing 10 is provided with a second cavity 192 and a load cavity 193. The second cavity 192 is used to accommodate the second side terminal 32, and the load cavity 193 is used to accommodate the load side terminal 33. The second cavity 192 and the load cavity 193 are located on both sides of the outer casing 10, and the two second exhaust ports 151 are connected to the outside through the second cavity 192 and the load cavity 193, respectively.

[0039] By providing a second cavity 192 and a load cavity 193 on the outer casing 10, a second side terminal 32 and a load side terminal 33 are provided. Both the second cavity 192 and the load cavity 193 are also provided with openings for wiring. The two second exhaust ports 151 of the second exhaust channel 15 are connected to the outside through the second cavity 192 and the load cavity 193 respectively. The openings for wiring at the second cavity 192 and the load cavity 193 are indirectly used as the outlets for the second exhaust channel 15 to connect to the outside. Therefore, there is no need to open other holes, which simplifies the design, reduces the complexity of the outer casing 10, and also provides a certain degree of protection.

[0040] To ensure that the energy generated when the moving contact separates directly enters the corresponding exhaust channel, the first arc-extinguishing chamber 11 is disposed inside the first exhaust channel 12, and the second arc-extinguishing chamber 14 is disposed inside the second exhaust channel 15. The first stationary contact 21 extends into the first exhaust channel 12, and the second stationary contact 22 extends into the second exhaust channel 15. The moving contact 23 is rotatably disposed on the housing 10. The rotation of the moving contact 23 drives the first end of the moving contact 23 to move in the first exhaust channel 12, and drives the second end of the moving contact 23 to move in the second exhaust channel 15, so as to connect or separate with the corresponding first stationary contact 21 or second stationary contact 22.

[0041] By placing the first arc-extinguishing chamber 11 inside the first exhaust channel 12 and the second arc-extinguishing chamber 14 inside the second exhaust channel 15, the first stationary contact 21 and the second stationary contact 22 are both partially extended into the corresponding exhaust channels, and a rotating moving contact 23 is provided. The rotation of the moving contact 23 drives the end of the moving contact 23 to move in the corresponding exhaust channel, ensuring that the energy generated when the end of the moving contact 23 separates from the first stationary contact 21 or the second stationary contact 22 can be discharged in time through the corresponding exhaust channel and diffused to the outside of the housing 10, avoiding accumulation near the moving and stationary contact positions and causing greater burn damage to the moving and stationary contacts.

[0042] Specifically, the moving contact 23 is rotatably disposed in the housing 10. When the moving contact 23 rotates, the first end of the moving contact 23 moves in the first exhaust channel 12 and is at least partially located in the first arc-extinguishing chamber 11, and the second end of the moving contact 23 moves in the second exhaust channel 15 and is at least partially located in the second arc-extinguishing chamber 14.

[0043] Optionally, the housing 10 is provided with a partition 18, which isolates the first exhaust channel 12 and the second exhaust channel 15. By setting the partition 18 to isolate the first exhaust channel 12 and the second exhaust channel 15, the mutual interference between the first and second sides can be reduced, the arc extinguishing capability can be improved, and the possibility of short circuit due to arcing on the first and second sides can be reduced. The partition 18 can be used to completely or partially isolate the first exhaust channel 12 and the second exhaust channel 15.

[0044] In this embodiment, two partitions 18 are spaced apart. The partitions 18 extend along the length of the outer shell 10 and are spaced apart along the width of the outer shell 10. The first exhaust channel 12 and the second exhaust channel 15 are located on opposite sides of the two partitions 18.

[0045] In this embodiment, the outer shell 10 is formed by two main shells fastening together. The main shells are provided with positioning posts 131 and positioning sleeves 132. When the two main shells are fastened together, the positioning posts 131 are inserted into the corresponding positioning sleeves 132. Each main shell is provided with two partitions 18 spaced apart along the width direction. The two partitions 18 on the same main shell are the first partition and the second partition. When the two main shells are fastened together, the first partitions on the two main shells are arranged opposite each other, and the second partitions on the two main shells are also arranged opposite each other. There is a gap between the first partitions of the two main shells and between the second partitions of the two main shells for the movement of the moving contact 23 (that is, the partitions 18 do not completely isolate the first exhaust channel 12 and the second exhaust channel 15) so that the end of the moving contact 23 can extend into the corresponding exhaust channel.

[0046] The partition 18, positioning post 131, and positioning sleeve 132 are integrally formed with the outer shell 10. See [link / reference]. Figure 1 and Figure 2 The positioning post 131 or positioning sleeve 132 can be embedded in a plate-like structure (e.g., partition 18) of the outer shell 10, or it can protrude into a cavity or channel (e.g., the first exhaust channel 12) of the outer shell 10, as long as it does not obstruct the normal discharge of gas in the exhaust channel. In other embodiments, the number and position of the positioning post 131 and positioning sleeve 132 can be adjusted according to actual needs.

[0047] Optionally, both the first arc-extinguishing chamber 11 and the second arc-extinguishing chamber 14 are provided with an arc-starting angle 17, which is used to introduce the electric arc into the corresponding first arc-extinguishing chamber 11 or second arc-extinguishing chamber 14. By providing an arc-starting angle 17 in both the first arc-extinguishing chamber 11 and the second arc-extinguishing chamber 14, the arc is attracted by the arc-starting angle 17, allowing the arc to enter the corresponding arc-extinguishing chamber more smoothly, thereby shortening the arc-extinguishing time, reducing the direct erosion of the moving and stationary contacts by the arc, and extending the service life of the moving and stationary contacts.

[0048] Specifically, the first arc-extinguishing chamber 11 includes two first support plates 111 and a first arc-extinguishing grid plate 112 connected between the two first support plates 111. The first support plates 111 are fixed on the outer shell 10. Multiple first arc-extinguishing grid plates 112 are arranged at intervals. An arc-inducing angle 17 is provided on one of the first arc-extinguishing grid plates 112 near the first stationary contact 21.

[0049] The second arc-extinguishing chamber 14 includes two second support plates 141 and a second arc-extinguishing grid plate 142 connected between the two second support plates 141. The second support plates 141 are fixed on the outer shell 10. Multiple second arc-extinguishing grid plates 142 are arranged at intervals. An arc-inducing angle 17 is provided on one of the second arc-extinguishing grid plates 142 near the second stationary contact 22.

[0050] By setting arc-extinguishing grids in the arc-extinguishing chamber, the electric arc can be divided, reducing the electric field strength of each segment of the arc and preventing the arc from reigniting. By setting an arc-initiating angle 17 on an arc-extinguishing grid near the corresponding stationary contact, the arc can be guided into the chamber. Multiple arc-extinguishing grids are arranged at intervals, which can effectively shorten the arc-extinguishing time and thus quickly extinguish the arc.

[0051] In this embodiment, the arc-initiating angle 17 extends toward the corresponding first stationary contact 21 or second stationary contact 22. It is understood that the arc-initiating angle 17 needs to be close to the corresponding stationary contact in order to smoothly introduce the arc into the arc-extinguishing grid, while also maintaining a suitable distance from the corresponding stationary contact to ensure that the arc is effectively divided and cooled, thereby achieving the purpose of extinguishing the arc.

[0052] Optionally, the arc-starting angle 17 is formed by bending the first arc-extinguishing grid plate 112 or the second arc-extinguishing grid plate 142. By forming the arc-starting angle 17 by bending, it is possible to avoid introducing additional connecting surfaces through separate processing, reduce the increase in contact resistance caused by bolts or welding, and reduce the risk of local overheating.

[0053] In this embodiment, the first stationary contact 21 is located outside and close to the first arc-extinguishing chamber 11, and the second stationary contact 22 is located outside and close to the second arc-extinguishing chamber 14. The moving contact 23 has moving contacts on both its first and second ends. When the moving contact 23 is in the first closed position, the moving contact at the first end of the moving contact 23 is located outside the first arc-extinguishing chamber 11 and is in contact with and connected to the first stationary contact 21. When the moving contact 23 is in the second closed position, the moving contact at the second end of the moving contact 23 is located outside the second arc-extinguishing chamber 14 and is in contact with and connected to the second stationary contact 22.

[0054] Since the first stationary contact 21 is located outside the first arc-extinguishing chamber 11 and the second stationary contact 22 is located outside the second arc-extinguishing chamber 14, in the first closed position, the contact point of the first end of the moving contact 23 is located outside the first arc-extinguishing chamber 11 when it contacts the first stationary contact 21; in the second closed position, the contact point of the second end of the moving contact 23 is located outside the second arc-extinguishing chamber 14 when it contacts the second stationary contact 22. This allows the energy generated between the moving contact 23 and the first stationary contact 21 or the second stationary contact 22 to enter the exhaust channel from the corresponding arc-extinguishing chamber or directly enter the corresponding exhaust channel and then be discharged, further improving the energy discharge efficiency.

[0055] It is understandable that in switching devices using arc-extinguishing grids, the moving contact is usually not placed directly in the arc-extinguishing chamber. Instead, when the moving and stationary contacts separate, the arc-extinguishing grid guides the arc into the arc-extinguishing chamber for arc extinguishing. In other embodiments, depending on actual needs, the stationary contact portion can be placed in the arc-extinguishing chamber (i.e., the first stationary contact 21 portion is placed in the first arc-extinguishing chamber 11, and the second stationary contact 22 portion is placed in the second arc-extinguishing chamber 14). The first end of the moving contact 23 is set to move in the first arc-extinguishing chamber 11, and the second end of the moving contact 23 moves in the second arc-extinguishing chamber 14 (thus ensuring that the moving contact of the first end of the moving contact 23 is always in the first arc-extinguishing chamber 11, and the moving contact of the second end of the moving contact 23 is always in the second arc-extinguishing chamber 14). In this case, the energy generated when the moving and stationary contacts separate needs to enter the corresponding exhaust channel from the arc-extinguishing chamber and then be discharged.

[0056] In this embodiment, the arc-starting angle 17 on the first arc-extinguishing grid plate 112 and the second arc-extinguishing grid plate 142 is formed by integral bending, and a groove is formed on the corresponding arc-extinguishing grid plate after bending; all the first arc-extinguishing grid plates 112 and the second arc-extinguishing grid plates 142 are provided with grooves (the grooves can be formed by integral bending or by cutting). The grooves on all the first arc-extinguishing grid plates 112 in the first arc-extinguishing chamber 11 form a first arc-extinguishing channel 113 that matches the movement trajectory of the first end of the moving contact 23. The first stationary contact 21 is located at a port near one end of the first arc-extinguishing channel 113 for contacting or separating from the moving contact point of the first end of the moving contact 23. The grooves on all the second arc-extinguishing grid plates 142 in the second arc-extinguishing chamber 14 form a second arc-extinguishing channel that matches the movement trajectory of the second end of the moving contact 23. The second stationary contact 22 is located at a port near one end of the second arc-extinguishing channel for contacting or separating from the moving contact point of the second end of the moving contact 23.

[0057] Optionally, the arc-starting angle 17 transitions continuously with the corresponding main body of the first arc-extinguishing grid plate 112 and the second arc-extinguishing grid plate 142 in an arc shape. The transition arc and curvature between the arc-starting angle 17 and the corresponding main body of the arc-extinguishing grid plate can be adjusted according to the airflow in the corresponding arc-extinguishing chamber.

[0058] Another aspect of this embodiment provides an automatic transfer switch, which includes the contact system described above. By setting the contact system, the automatic transfer switch is guaranteed to have reliable arc extinguishing capability.

[0059] The following is a detailed description of the operation of the contact system:

[0060] When the moving contact 23 is in the second closed position, the top of the moving contact 23 of the contact system contacts the second stationary contact 22; once the moving contact 23 separates from the second stationary contact 22, an electric arc is generated between the moving contact 23 and the second stationary contact 22. The arc-inducing angle 17 on the second arc-extinguishing grid plate 142 introduces the electric arc into the second arc-extinguishing chamber 14, where the arc is extinguished. The energy generated between the moving contact 23 and the second stationary contact 22 can directly enter the second exhaust channel 15 (or enter the second exhaust channel 15 from the second arc-extinguishing chamber 14), and is discharged in time through the second exhaust port 151 of the second exhaust channel 15, and through the openings at the corresponding second cavity 192 and load cavity 193.

[0061] When the moving contact 23 is in the first closed position, the bottom end of the moving contact 23 of the contact system is in contact with the first stationary contact 21. Once the moving contact 23 separates from the first stationary contact 21, an electric arc is generated between the moving contact 23 and the first stationary contact 21. The arc-inducing angle 17 on the first arc-extinguishing grid plate 112 introduces the electric arc into the first arc-extinguishing chamber 11, where the arc is extinguished. The energy generated between the moving contact 23 and the first stationary contact 21 can directly enter the first exhaust channel 12 (or enter the first exhaust channel 12 from the first arc-extinguishing chamber 11), and be discharged directly through the first exhaust port 121 of the first exhaust channel 12, or through the opening at the first cavity 191.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A contact system, characterized in that, The device includes a housing (10) and a contact assembly. The contact assembly includes a first stationary contact (21), a second stationary contact (22), and a moving contact (23) disposed on the housing (10). The housing (10) contains a first arc-extinguishing chamber (11) and a second arc-extinguishing chamber (14). The first arc-extinguishing chamber (11) is disposed corresponding to the first stationary contact (21), and the second arc-extinguishing chamber (14) is disposed corresponding to the second stationary contact (22). The first end of the moving contact (23) corresponding to the first stationary contact (21) is at least partially located within the first arc-extinguishing chamber (11). The second end corresponding to the second stationary contact (22) is at least partially located inside the second arc-extinguishing chamber (14); the outer shell (10) is provided with a first exhaust channel (12) communicating with the first arc-extinguishing chamber (11), and the outer shell (10) is provided with a second exhaust channel (15) communicating with the second arc-extinguishing chamber (14). The two ends of the first exhaust channel (12) form first exhaust ports (121) communicating with the outside on the two side walls of the outer shell (10), and the two ends of the second exhaust channel (15) form second exhaust ports (151) communicating with the outside on the two side walls of the outer shell (10).

2. The contact system according to claim 1, characterized in that, The outer casing (10) is provided with a partition (18) that isolates the first exhaust passage (12) and the second exhaust passage (15).

3. The contact system according to claim 1, characterized in that, The outer casing (10) is provided with a first cavity (191) for accommodating the first side terminal (31). One end of the first exhaust channel (12) is connected to the outside via the first exhaust port (121) and the first cavity (191), and the other end of the first exhaust port (121) is directly connected to the outside.

4. The contact system according to claim 1, characterized in that, The outer casing (10) is provided with a second cavity (192) and a load cavity (193). The second cavity (192) is used to accommodate the second side terminal (32), and the load cavity (193) is used to accommodate the load side terminal (33). The second cavity (192) and the load cavity (193) are located on both sides of the outer casing (10). The two second exhaust ports (151) are connected to the outside through the second cavity (192) and the load cavity (193) respectively.

5. The contact system according to claim 1, characterized in that, The first arc-extinguishing chamber (11) is disposed inside the first exhaust channel (12), the second arc-extinguishing chamber (14) is disposed inside the second exhaust channel (15), the first stationary contact (21) extends into the first exhaust channel (12), the second stationary contact (22) extends into the second exhaust channel (15), the moving contact (23) is rotatably disposed on the housing (10), the moving contact (23) rotates to drive the first end of the moving contact (23) to move in the first exhaust channel (12), and drives the second end of the moving contact (23) to move in the second exhaust channel (15), so as to communicate or separate with the corresponding first stationary contact (21) or second stationary contact (22).

6. The contact system according to claim 1, characterized in that, Both the first arc-extinguishing chamber (11) and the second arc-extinguishing chamber (14) are provided with an arc-inducing angle (17), which is used to introduce the electric arc into the corresponding first arc-extinguishing chamber (11) or second arc-extinguishing chamber (14).

7. The contact system according to claim 6, characterized in that, The arc-drawing angle (17) extends toward the corresponding first stationary contact (21) or second stationary contact (22).

8. The contact system according to claim 6, characterized in that, The first arc-extinguishing chamber (11) includes two first support plates (111) and a first arc-extinguishing grid plate (112) connected between the two first support plates (111). Multiple first arc-extinguishing grid plates (112) are arranged at intervals, and the arc-inducing angle (17) is provided on one of the first arc-extinguishing grid plates (112) near the first stationary contact (21). And / or, the second arc-extinguishing chamber (14) includes two second support plates (141) and a second arc-extinguishing grid plate (142) connected between the two second support plates (141). A plurality of the second arc-extinguishing grid plates (142) are arranged at intervals, and the arc-starting angle (17) is provided on one of the second arc-extinguishing grid plates (142) near the second stationary contact (22).

9. The contact system according to claim 8, characterized in that, The arc-starting angle (17) is formed by bending the first arc-extinguishing grid plate (112) or the second arc-extinguishing grid plate (142).

10. An automatic transfer switch, characterized in that, Includes the contact system as described in any one of claims 1-9.

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