Static contact

Abstract

The utility model provides a static contact, relates to the technical field of circuit breakers, and is used for improving the protection capability of the static contact, reducing the possibility of overheating and even burning loss of the static contact, and prolonging the service life of the static contact. The static contact comprises a static contact body and a cover shell, the static contact body comprises an installation section and a contact section which are connected, and one side of the contact section is provided with a contact area used for making contact with the moving contact. The housing is arranged on the contact section. The cover shell comprises a cover shell body, and a through hole is formed in the position, corresponding to the contact area, of the cover shell body. A first extension part far away from the contact section is arranged on the housing body corresponding to the circumferential direction of the through hole, an arc extinguishing space is defined by the first extension part, and the contact area is located in the arc extinguishing space.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, specifically to a stationary contact. Background Technology

[0002] A circuit breaker is a switching device used to protect circuits. A circuit breaker generally consists of a moving contact and a stationary contact. When the moving contact is in contact with the stationary contact, the circuit current is flowing, and the circuit breaker is in normal operating condition. When an overload, short circuit, or other fault occurs in the circuit, the moving contact disengages from the stationary contact, interrupting the current in the circuit and preventing damage to electrical equipment or dangerous situations such as fires.

[0003] When the moving contact and the stationary contact lose contact, an electric arc is generated, resulting in the phenomenon of high-temperature arc erosion of the stationary contact.

[0004] In the prior art, a cover is generally installed on the stationary contact to reduce damage to the stationary contact caused by high-temperature electric arc. However, the cover in the prior art has weak protection for the stationary contact, and there is a possibility that the stationary contact may overheat or even burn out, resulting in a short service life for the stationary contact. Utility Model Content

[0005] This application provides a stationary contact to improve its protection capability, reduce the possibility of overheating or even burning, and extend its service life.

[0006] To achieve the above objectives, this application provides a stationary contact, including a stationary contact body and a housing. The stationary contact body includes a mounting section and a contact section connected together, and one side of the contact section has a contact area for contacting a moving contact. The housing is disposed on the contact section. The housing includes a housing body, and a through hole is formed on the housing body at a position corresponding to the contact area. Circumferentially corresponding to the through hole, a first extension portion is provided on the housing body that extends away from the contact section. The first extension portion encloses and forms an arc-extinguishing space, and the contact area is located within the arc-extinguishing space.

[0007] When the above technical solution is adopted, if an overload, short circuit, or other fault occurs in the circuit where the circuit breaker is located, and the moving contact and stationary contact lose contact, the generated arc can be contained within the arc-extinguishing space, reducing the arc's radiation range and preventing arc spread. Simultaneously, it facilitates the concentrated guidance of the arc, aiding in its rapid extinguishing and reducing direct erosion of the stationary contact body by the arc. Furthermore, it enhances the protection capability of the stationary contact body, reduces the possibility of overheating or even burn-out, improves the breaking capacity of the stationary contact, and extends its service life.

[0008] In one possible implementation, the casing is a nylon casing.

[0009] When adopting the above technical solution, the housing is made of nylon, which can significantly reduce the weight of the housing while ensuring sufficient strength, thereby reducing the load on the stationary contact body. At the same time, nylon material has the characteristics of high temperature resistance, reducing the burn damage to the housing caused by high-temperature arcs and improving the high temperature resistance performance of the housing.

[0010] Furthermore, nylon is an excellent gas-generating material. At certain temperatures, it can produce a large amount of gas to blow away the electric arc. This not only accelerates the arc's decomposition and further promotes its extinction, but also elongates and thins the arc, increasing its surface area, rapidly lowering its temperature, preventing further thermal ionization, enhancing the arc's cooling effect, and thus facilitating its extinction and improving arc-extinguishing efficiency.

[0011] In one possible implementation, the four edges of the casing body correspond to the four edges of the contact section.

[0012] When the above technical solution is adopted, the housing body can fully cover the contact section, avoid direct contact between the high-temperature arc and the contact section, improve the protective performance of the housing for the contact section, and reduce the burning of the stationary contact body by the high-temperature arc.

[0013] At the same time, the large contact area between the cover body and the contact section can improve the stability of the cover body on the stationary contact body.

[0014] In addition, since the four edges of the cover body correspond to the four edges of the contact section, no additional adjustments or corrections are required during installation. Simply place the cover body on the contact section and fix it in place. This not only saves installation time but also reduces installation costs and improves production efficiency.

[0015] In one possible implementation, a second extension is provided on the side of the first extension away from the arc extinguishing space, the second extension extends in a direction away from the arc extinguishing space, and the second extension is provided on the cover body.

[0016] When the above technical solution is adopted, the second extension can act as a reinforcing rib, which can improve the deformation resistance of the cover and enhance the structural strength of the cover.

[0017] In one possible implementation, a support portion is provided on the side of the housing body near the contact section, and the support portion is used to make support contact with the contact section.

[0018] When the above technical solution is adopted, when the housing body is installed on the contact section, the support part is in contact with the contact section, so that an air flow channel can be formed between the housing body and the contact section. The formation of the air flow channel promotes the convection of air inside and outside the stationary contact, which helps to remove the heat generated inside the stationary contact in time, improves the heat dissipation efficiency, cools the stationary contact, and reduces the probability of the housing being melted by high temperature.

[0019] Furthermore, airflow can reduce the temperature gradient inside the stationary contact, resulting in a more uniform temperature distribution throughout the stationary contact and helping to extend its service life.

[0020] Furthermore, the support structure acts as a reinforcing rib, which can improve the shell's resistance to deformation and enhance its structural strength.

[0021] In one possible implementation, the cover is snapped into the contact section.

[0022] When using the above technical solution, the cover and the contact section are connected by a snap-fit ​​method. On the one hand, compared to traditional bolt connections and welding, this greatly simplifies the installation process and reduces installation time and costs. On the other hand, the snap-fit ​​method typically does not require additional tools or equipment, making on-site installation more flexible and efficient. Furthermore, during the snap-fit ​​process between the cover and the contact section, a certain pre-tightening force is generated, which can accommodate a certain degree of deformation, ensuring the reliability and tightness of the connection between the cover and the contact section. Additionally, the snap-fit ​​method allows the cover to be easily disassembled when needed without damaging the original connection structure, facilitating subsequent maintenance, repair, or replacement.

[0023] In one possible implementation, a through groove is provided on the contact section, extending along the direction from the contact section to the mounting section.

[0024] By adopting the above technical solution, the weight of the stationary contact body can be reduced, thus decreasing the amount of material used and saving costs. Furthermore, the combination of the through-slot and through-hole forms an airflow channel. This airflow channel promotes air convection inside and outside the stationary contact, helping to remove heat generated inside the stationary contact in a timely manner, improving heat dissipation efficiency, cooling the stationary contact, and reducing the likelihood of the casing melting at high temperatures.

[0025] Furthermore, airflow can reduce the temperature gradient inside the stationary contact, resulting in a more uniform temperature distribution throughout the stationary contact and helping to extend its service life.

[0026] In practice, the structure of the stationary contact body can be optimized. The design of the through slot may make the current distribution on the stationary contact body more uniform, reducing the risk of local overheating and arc discharge, thereby improving conductivity and electrical safety.

[0027] In one possible implementation, a plurality of snap fasteners are provided on the side of the housing body near the contact section, wherein at least one snap fastener is used to engage with the edge of the contact section away from the mounting section, and at least another snap fastener is used to engage with the groove wall of the through groove.

[0028] When using the above technical solution, the design of multiple snap-fits makes it easier for the housing body to engage with the contact section during installation, eliminating the need for additional fasteners or tools and greatly simplifying the installation process. Furthermore, the snap-fit ​​structure typically has guiding and positioning functions, allowing the housing body to be easily and accurately installed on the contact section and to fit tightly against the wall of the through groove.

[0029] In one possible implementation, the housing body is provided with two first limiting portions extending toward the contact section. The two first limiting portions are arranged opposite each other in a direction perpendicular to the direction from the contact section to the mounting section. The first limiting portions are used to limit contact with the groove wall of the through groove.

[0030] When the above technical solution is adopted, the first limiting part makes limiting contact with the groove wall of the through groove, which can effectively limit the cover and improve the stability of the cover installed on the contact section.

[0031] In one possible implementation, the housing body is further provided with a second limiting part extending toward the contact section, the second limiting part being used to limit contact with the edge of the contact section away from the mounting section.

[0032] When the above technical solution is adopted, the second limiting part makes limiting contact with the edge of the contact section away from the installation section, which enhances the stability of the cover installed on the contact section, reduces the possibility of the cover lifting due to the electric repulsion force generated when the stationary contact and the moving contact are separated, and avoids the cover from failing to protect the stationary contact body. Attached Figure Description

[0033] Figure 1 Schematic diagram of the structure of the stationary contact provided in the embodiments of this application Figure 1 .

[0034] Figure 2 Schematic diagram of the structure of the stationary contact provided in the embodiments of this application Figure 2 .

[0035] Figure 3 This is a schematic diagram of the structure of the stationary contact body provided in an embodiment of this application.

[0036] Figure 4 Schematic diagram of the structure of the housing provided in the embodiments of this application Figure 1 .

[0037] Figure 5 Schematic diagram of the structure of the housing provided in the embodiments of this application Figure 2 .

[0038] Explanation of reference numerals in the attached figures:

[0039] 1-Stationary contact body, 11-Mounting section, 12-Contact section, 121-Through groove, 122-Contact part, 13-Transition section, 14-Silver dot, 2-Casing, 21-Casing body, 211-Through hole, 22-First extension, 23-Second extension, 24-Support part

[0040] 25-Snap fastener, 251-Protrusion, 26-First limiting part, 27-Second limiting part. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0043] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, 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 application.

[0045] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0046] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0047] In the operation of low-voltage power distribution systems, the performance of low-voltage molded case circuit breakers is crucial as a core device for ensuring circuit safety. When an overload, short circuit, or other fault occurs in the circuit where the low-voltage molded case circuit breaker is located, a high-temperature electric arc will be generated instantaneously around the stationary contacts when the low-voltage molded case circuit breaker performs a breaking operation.

[0048] In existing technologies, a cover is generally installed on the stationary contact to reduce damage to the stationary contact caused by high-temperature electric arcs. However, existing covers have shortcomings in terms of arc extinguishing efficiency, protection of the stationary contact, and material utilization. They are prone to overheating and even burning of the stationary contact, resulting in a short service life.

[0049] In view of the problems existing in the prior art, such as Figure 1 and Figure 2 As shown, this application provides a stationary contact, which includes a stationary contact body 1 and a housing 2.

[0050] In fact, the stationary contact body 1 is a device used for electrical connection and signal transmission. It is usually made of metal material and establishes electrical contact with the moving contact to ensure the stability and reliability of current and signal transmission.

[0051] like Figures 1 to 3 As shown, the stationary contact body 1 includes a mounting section 11 and a contact section 12 connected to each other. In a specific implementation, the contact section 12 is used to contact the moving contact.

[0052] When contact section 12 is in contact with the moving contact, the stationary contact body 1 is energized, the circuit current is conducted, and the circuit breaker is in normal working condition. When an overload, short circuit, or other fault occurs in the circuit where the circuit breaker is located, contact section 12 disengages from the moving contact to cut off the circuit current and prevent damage to electrical equipment or dangerous situations such as fire.

[0053] Mounting section 11 is used to connect to the circuit breaker housing, thereby fixing the stationary contact onto the housing.

[0054] The connection method between the mounting section 11 and the housing is not specifically limited here. For example, the connection method between the mounting section 11 and the housing can be welding, screw connection, snap-fit ​​or riveting, etc., but it is not limited to these in practice.

[0055] In reality, such as Figures 1 to 3 As shown, the stationary contact body 1 also includes a transition section 13. One end of the transition section 13 is connected to one end of the mounting section 11, and the other end of the transition section 13 is connected to one end of the contact section 12.

[0056] The surface of the contact section 12 and the surface of the mounting section 11 can be parallel to each other, and the surface of the transition section 13 can be perpendicular to the surface of the mounting section 11.

[0057] The connection method between the transition section 13 and the mounting section 11 and the contact section 12 is not specifically limited here. For example, the connection method between the transition section 13 and the mounting section 11 and the contact section 12 can be welding, screw connection, snap-fit ​​or riveting, etc., but it is not limited to these in practice.

[0058] In the embodiments provided in this application, the stationary contact body 1 can be formed by integral machining.

[0059] The stationary contact body 1 is formed by a one-piece machining process, reducing the connection and assembly steps between the transition section 13, mounting section 11, and contact section 12, thus lowering the risk of failure due to poor connections or loose components. Simultaneously, this achieves a compact structure for the stationary contact body 1, reducing the space it occupies within the circuit breaker, resulting in a smaller and lighter circuit breaker. It also helps improve the overall integration of the circuit breaker, facilitating installation and maintenance. Furthermore, it effectively reduces the contact resistance of the stationary contact body 1, improving current transmission efficiency and reducing energy loss and heat generation.

[0060] One side of the contact segment 12 has a contact area for contacting the moving contact. In fact, the contact segment 12 is provided with a contact portion 122, and a portion of the contact portion 122 can be designated as the contact area. Of course, in the embodiments provided in this application, silver dots 14 can be provided on the contact portion 122, such as... Figure 1 and Figure 3 As shown, in specific implementation, the silver point 14 is used to contact the moving contact.

[0061] Silver point 14 possesses low resistivity and excellent conductivity. Incorporating silver point 14 in the stationary contact ensures the stability and efficiency of current transmission, effectively preventing poor contact and performance degradation due to corrosion, and extending the service life of the stationary contact body 1. The silver point 14 significantly reduces contact resistance, minimizing heat loss and energy consumption caused by excessive resistance. Silver point 14 also exhibits high hardness and wear resistance, enabling it to withstand frequent circuit switching and disconnection, ensuring long-term stable operation of the stationary contact.

[0062] In the embodiments provided in this application, the cover 2 is disposed on the contact section 12. The manner in which the cover 2 is disposed on the contact section 12 is not specifically limited here, but shall be subject to the actual situation. The material of the cover 2 is also not specifically limited here.

[0063] Combination Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the housing 2 includes a housing body 21, and a through hole 211 is provided on the housing body 21 at the position corresponding to the contact area. Corresponding to the circumference of the through hole 211, a first extension 22 is provided on the housing body 21 that moves away from the contact section 12. The first extension 22 surrounds and forms an arc-extinguishing space, and the contact area is located within the arc-extinguishing space.

[0064] Thus, when an overload, short circuit, or other fault occurs in the circuit containing the circuit breaker, and the moving contact loses contact with the stationary contact, the generated arc can be contained within the arc-extinguishing space, reducing the arc's radiation range and preventing arc spread. Simultaneously, it facilitates the concentrated guidance of the arc, aiding in its rapid extinguishing and reducing direct erosion of the stationary contact body 1. Furthermore, it enhances the protection capability of the stationary contact body 1, reduces the possibility of overheating or even burn-out of the stationary contact, improves its breaking capacity, and extends its service life.

[0065] In specific implementation, the through hole 211 can be a circular hole or a rectangular hole, etc., and no specific limitation is made here.

[0066] The first extension 22 can be integrally formed with the cover body 21. Of course, the first extension 22 can also be set on the cover body 21 by welding, snap-fitting or other methods. No specific limitation is made here, and the actual situation shall prevail.

[0067] As one possible implementation, the casing 2 is a nylon casing.

[0068] Thus, the use of nylon material for the housing 2 can significantly reduce its weight while ensuring sufficient strength, thereby reducing the load on the stationary contact body 1. Simultaneously, the high-temperature resistance of nylon material reduces the burn damage to the housing 2 caused by high-temperature arcs, improving its high-temperature resistance.

[0069] Furthermore, nylon is an excellent gas-generating material. At certain temperatures, it can produce a large amount of gas to blow away the electric arc, which not only accelerates the arc's decomposition and further promotes its extinction, but also elongates and thins the arc, increasing its surface area, rapidly reducing its temperature, and preventing further thermal ionization.

[0070] As described above, using nylon material for the housing 2 not only ensures the structural strength of the housing 2, but also enhances the cooling effect of the electric arc, which is beneficial for extinguishing the arc and improving the arc extinguishing efficiency. This reduces the burning of the stationary contact body 1 by the high-temperature electric arc and improves the reliability of the disconnection.

[0071] In practical implementation, a certain proportion of glass fiber can be added to the nylon material to improve the structural strength of the cover 2 and prevent the cover 2 from deforming.

[0072] In some embodiments, the periphery of the housing body 21 corresponds to the periphery of the contact section 12.

[0073] At this time, the housing body 21 can fully cover the contact section 12, preventing the high-temperature arc from directly contacting the contact section 12, improving the protective performance of the housing 2 for the contact section 12, and reducing the burning of the stationary contact body 1 by the high-temperature arc.

[0074] Meanwhile, the larger contact area between the cover body 21 and the contact section 12 enhances the stability of the cover 2 on the stationary contact body 1.

[0075] In addition, since the four edges of the cover body 21 correspond to the four edges of the contact section 12, no additional adjustment or correction is required during installation. Simply place the cover body 21 on the contact section 12 and fix it. This not only saves installation time but also reduces installation costs and improves installation efficiency.

[0076] In one example, please refer to Figure 4 A second extension 23 is provided on the side of the first extension 22 away from the arc extinguishing space. The second extension 23 extends in a direction away from the arc extinguishing space and is provided on the cover body 21.

[0077] When the above technical solution is adopted, the second extension 23 can act as a reinforcing rib, which can improve the deformation resistance of the cover 2 and enhance the structural strength of the cover 2.

[0078] In specific implementation, the second extension 23 can be integrally formed with the cover body 21 and the first extension 22. Of course, the second extension 23 can also be set on the cover body 21 by welding, snap-fitting or other methods. There is no specific limitation here, and the actual situation shall prevail.

[0079] The number of second extensions 23 can be two, three, four, or more, and no specific limitation is made here. In the embodiment provided in this application, there are two second extensions 23, and the two second extensions 23 are disposed opposite to each other on both sides of the first extension 22.

[0080] As a feasible approach, combining Figure 1 and Figure 5 As shown, a support portion 24 is provided on the side of the cover body 21 near the contact section 12, and the support portion 24 is used to support the contact section 12.

[0081] In this case, when the housing body 21 is installed on the contact section 12, the support part 24 is in support contact with the contact section 12, so that an air flow channel can be formed between the housing body 21 and the contact section 12. The formation of the air flow channel promotes the convection of air inside and outside the stationary contact, which helps to remove the heat generated inside the stationary contact in time, improves the heat dissipation efficiency, cools the stationary contact, and reduces the probability of the housing 2 being melted by high temperature.

[0082] Furthermore, airflow can reduce the temperature gradient inside the stationary contact, resulting in a more uniform temperature distribution throughout the stationary contact and helping to extend its service life.

[0083] Furthermore, the support part 24 can act as a reinforcing rib, which can improve the deformation resistance of the cover 2 and enhance the structural strength of the cover 2.

[0084] In practice, the support part 24 can be a long strip structure, and the extension direction of the long strip structure support part 24 can be perpendicular to the direction from the contact section 12 to the mounting section 11.

[0085] Of course, the support part 24 can also be a boss structure. In fact, the structure of the support part 24 is not limited to this.

[0086] It should be noted that there can be multiple support parts 24 to enhance the connection stability between the housing body 21 and the contact section 12 and improve the structural strength of the stationary contact.

[0087] The number of support parts 24 can be two, three or more, and no specific limit is made here.

[0088] The support part 24 can be integrally formed with the cover body 21. Of course, the support part 24 can also be set on the cover body 21 by welding, snap-fit ​​or other methods. No specific limitation is made here, and the actual situation shall prevail.

[0089] In one embodiment, the cover 2 is engaged with the contact section 12.

[0090] Thus, the housing 2 and the contact section 12 are connected by a snap-fit ​​method. On the one hand, compared with traditional bolt connections and welding methods, this greatly simplifies the installation process and reduces installation time and costs. On the other hand, the snap-fit ​​method usually does not require additional tools or equipment, making on-site installation more flexible and efficient. Furthermore, during the snap-fit ​​process between the housing 2 and the contact section 12, a certain pre-tightening force is generated, which can accommodate a certain degree of deformation, ensuring the reliability and tightness of the connection between the housing 2 and the contact section 12. In addition, the snap-fit ​​method allows the housing 2 to be easily disassembled when needed without damaging the original connection structure, facilitating subsequent maintenance, repair, or replacement.

[0091] In some embodiments, such as Figure 3 As shown, a through groove 121 is provided on the contact section 12, and the through groove 121 extends along the direction from the contact section 12 to the mounting section 11.

[0092] This reduces the weight of the stationary contact body 1, decreasing the amount of material used and saving costs. Furthermore, the through groove 121 and through hole 211 work together to form an airflow channel. This airflow channel promotes air convection inside and outside the stationary contact, helping to remove heat generated inside the stationary contact in a timely manner, improving heat dissipation efficiency, cooling the stationary contact, and reducing the likelihood of the casing 2 melting at high temperatures.

[0093] Furthermore, airflow can reduce the temperature gradient inside the stationary contact, resulting in a more uniform temperature distribution throughout the stationary contact and helping to extend its service life.

[0094] In practice, by optimizing the structure of the stationary contact body 1, the design of the through groove 121 may make the current distribution on the stationary contact body 1 more uniform, reducing the risk of local overheating and arc discharge, thereby improving conductivity and electrical safety.

[0095] As one possible approach, please combine Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a plurality of snap fasteners 25 are provided on the side of the housing body 21 near the contact section 12, wherein at least one snap fastener 25 is used to engage with the edge of the contact section 12 away from the mounting section 11, and at least one other snap fastener 25 is used to engage with the groove wall of the through groove 121.

[0096] At this point, the design of multiple snap-fits 25 makes it easier for the housing body 21 to engage with the contact section 12 during installation, without the need for additional fasteners or tools, greatly simplifying the installation process. In addition, the snap-fit ​​structure usually has guiding and positioning functions, allowing the housing body 21 to be easily and accurately installed on the contact section 12 and to fit tightly against the groove wall of the through groove 121.

[0097] Specifically, a protrusion 251 is provided on the side of the buckle 25 away from the cover body 21. When the cover 2 is placed on the contact section 12, the side of the protrusion 251 near the cover body 21 abuts and limits the contact section 12 on the side surface away from the cover body 21, thereby making the cover 2 engage with the contact section 12.

[0098] The number of buckles 25 can be two, three, four or more, without specific limitation, subject to the actual situation.

[0099] In practice, the buckle 25 can be integrally formed with the cover body 21. Of course, the buckle 25 can also be set on the cover body 21 by welding, snap-fitting or other methods. There is no specific limitation here, and the actual situation shall prevail.

[0100] In the embodiments provided in this application, please refer to Figure 2 and Figure 5 There are three clips 25, one of which engages with the edge of the contact section 12 away from the mounting section 11, and the other two clips 25 engage with the wall of the through groove 121. The two clips 25 are located on the side of the contact section 12 closer to the mounting section 11 to distribute the connection stress between the cover 2 and the contact section 12, thus achieving a stronger fixing effect for the cover body 21, ensuring the stability of the connection between the cover 2 and the contact section 12, and preventing loosening or detachment.

[0101] As one possible approach, please combine Figure 2 and Figure 5 As shown, the cover body 21 is provided with two first limiting parts 26 extending toward the contact section 12. The two first limiting parts 26 are arranged opposite each other in a direction perpendicular to the direction from the contact section 12 to the mounting section 11. The first limiting parts 26 are used to limit contact with the groove wall of the through groove 121.

[0102] In this way, the first limiting part 26 makes limiting contact with the groove wall of the through groove 121, which can effectively limit the cover 2 and improve the stability of the cover 2 installed on the contact section 12.

[0103] In practice, the first limiting part 26 can be integrally formed with the cover body 21. Of course, the first limiting part 26 can also be set on the cover body 21 by welding, snap-fitting or other methods. There is no specific limitation here, and the actual situation shall prevail.

[0104] In one possible implementation, please combine Figure 2 , Figure 4 and Figure 5 As shown, the housing body 21 is also provided with a second limiting part 27 extending toward the contact section 12. The second limiting part 27 is used to limit contact with the edge of the contact section 12 away from the mounting section 11.

[0105] Thus, the second limiting part 27 makes limiting contact with the edge of the contact section 12 away from the mounting section 11, which enhances the stability of the cover 2 on the contact section 12, reduces the possibility of the cover 2 tilting due to the electric repulsion force generated when the stationary contact and the moving contact are separated, and avoids the cover 2 from failing to protect the stationary contact body 1.

[0106] The number of the second limiting part 27 is not specifically limited here, and the specific number shall be subject to the actual situation.

[0107] In practice, the second limiting part 27 can be integrally formed with the cover body 21. Of course, the second limiting part 27 can also be set on the cover body 21 by welding, snap-fitting or other methods. There is no specific limitation here, and the actual situation shall prevail.

[0108] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A stationary contact, characterized in that The utility model relates to a static contactor, comprising: a static contact body comprising a connecting section and a contact section, the contact section having a contact area on one side for contacting a moving contact; a cover arranged on the contact section, the cover comprising a cover body, a through hole being formed on the cover body at a position corresponding to the contact area, and a first extension being arranged on the cover body corresponding to the circumferential direction of the through hole, the first extension being arranged away from the contact section and forming an arc-extinguishing space, and the contact area being located in the arc-extinguishing space.

2. Static contact according to claim 1, characterized in that The cover is a nylon cover.

3. Static contact according to claim 1, characterized in that The four peripheral edges of the cover body correspond to the four peripheral edges of the contact section.

4. Stationary contact according to claim 1, characterized in that A second extension is arranged on the side of the first extension away from the arc-extinguishing space, the second extension extending away from the arc-extinguishing space, and the second extension being arranged on the cover body.

5. Stationary contact according to claim 1, characterized in that A support portion is arranged on the side of the cover body close to the contact section, the support portion being used for supporting the contact section.

6. Stationary contact according to claim 1, characterized in that The cover is clamped with the contact section.

7. Stationary contact according to claim 6, characterized in that A through groove is arranged on the contact section, the through groove extending along the direction from the contact section to the connecting section.

8. Stationary contact according to claim 7, characterized in that A plurality of buckles are arranged on the side of the cover body close to the contact section, at least one of the buckles being used for clamping with the edge of the contact section away from the connecting section, and at least one of the buckles being used for clamping with the groove wall of the through groove.

9. Stationary contact according to claim 7, characterized in that Two first limiting portions extending towards the contact section are arranged on the cover body, the two first limiting portions being oppositely arranged in a direction perpendicular to the direction from the contact section to the connecting section, and the first limiting portions being used for limiting contact with the groove wall of the through groove.

10. Stationary contact according to claim 7, characterized in that A second limiting portion extending towards the contact section is further arranged on the cover body, the second limiting portion being used for limiting contact with the edge of the contact section away from the connecting section.

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