Arc isolation structure and circuit breaker

Abstract

The utility model discloses an arc-isolating structure and a circuit breaker, and relates to the technical field of low-voltage electrical appliances, the arc-isolating structure is arranged on a switching device, the switching device comprises a shell and a base which are connected, the base is provided with a mounting groove, a contact assembly is arranged in the mounting groove, and the arc-isolating structure comprises an arc-isolating plate and an arc-isolating cover. And the flash barrier is arranged on one side, close to the shell, of the base, the flash barrier and the mounting groove are enclosed to form an arc extinguishing cavity, the flash barrier is provided with an assembly window, and part of the contact assembly penetrates through the assembly window. The arc isolating cover is arranged in the assembling window, and the arc isolating cover can be matched with the contact assembly to seal the assembling window. According to the arc isolation structure and the circuit breaker provided by the invention, the risk of arc diffusion can be reduced, and the use safety of the circuit breaker is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to an arc isolation structure and a circuit breaker. BACKGROUND

[0002] Low-voltage switching devices can control the on and off of the circuit, when the circuit is disconnected, the moving contact and the static contact in the low-voltage switching device are separated, and in this process, the arc is easily generated between the moving contact and the static contact.

[0003] In the existing low-voltage switching device, an arc extinguishing chamber is usually provided, the moving contact and the static contact realize contact and separation in the arc extinguishing chamber, and the arc generated in the process of separation of the moving contact and the static contact can be extinguished in the arc extinguishing chamber by the arc extinguishing assembly.

[0004] However, the existing technology has the risk that part of the arc may spread out of the arc extinguishing chamber, and the risk of damage to other components in the low-voltage switching device by the arc is high. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present application is to provide an arc isolation structure and a circuit breaker, which can reduce the risk of arc spreading and improve the safety of the circuit breaker.

[0006] In a first aspect, an arc isolation structure is provided, which is arranged in a switching device, the switching device comprising a housing and a base connected together, the base having a mounting slot, a contact assembly being arranged in the mounting slot, the arc isolation structure comprising an arc isolation plate and an arc isolation cover. The arc isolation plate is arranged on the side of the base close to the housing, and the arc isolation plate and the mounting slot form an arc extinguishing chamber. The arc isolation plate is provided with an assembly window, and part of the contact assembly is arranged in the assembly window. The arc isolation cover is arranged in the assembly window and can cooperate with the contact assembly to close the assembly window.

[0007] Based on the above-mentioned embodiments of the present application, by arranging the arc isolation plate on the base, the base and the housing can be separated, preventing the arc generated by the contact assembly during the breaking process from damaging other components in the housing. The arrangement of the arc isolation cover can cooperate with the contact assembly arranged in the assembly window, without affecting the movement of the contact assembly and the connection between the contact assembly and other components in the housing. The arc isolation cover can cooperate with the contact assembly to close the assembly window, prevent the arc from spreading to the housing from the arc isolation window, further reduce the possibility of damage to other components in the housing by the arc, and improve the safety of the switching device.

[0008] In some examples, the arc isolation cover is provided with a limiting hole, the limiting hole being in communication with the arc extinguishing chamber and the side of the arc isolation plate close to the housing, the contact assembly comprising a contact support, the contact support being arranged in the limiting hole, and the contact support being movable relative to the arc isolation cover along the axis of the limiting hole.

[0009] Based on the above-mentioned embodiments of the present application, the setting of the limiting hole enables the arc separation cover to be sleeved on the contact support, and the arc separation cover is arranged in the assembly window to be spaced between the contact support and the assembly window. In this way, without affecting the action of the contact support, the position of the contact support can be limited to avoid the shaking of the contact support and improve the installation stability of the contact support, and the risk of arc diffusion out of the arc extinction chamber due to the existence of a large gap between the contact support and the assembly window can be avoided.

[0010] In some examples, a limiting groove is further arranged on the arc separation cover. The limiting groove is arranged on the outer side wall of the arc separation cover and is communicated between the arc extinction chamber and the side of the arc separation plate close to the shell. The contact assembly further comprises a static contact plate, which is correspondingly arranged in the limiting groove.

[0011] Based on the above-mentioned embodiments of the present application, the setting of the limiting groove is the same as that of the limiting hole. The limiting groove can limit the static contact plate in the contact assembly, thereby improving the installation stability of the static contact plate arranged in the assembly window. Meanwhile, the close cooperation of the limiting groove and the static contact plate in the assembly window can reduce the gap between the static contact plate and the assembly window, thereby reducing the risk of arc diffusion out of the arc extinction chamber.

[0012] In some examples, a first limiting structure is arranged on the arc separation cover, and a first limiting part is arranged on the base. The first limiting structure cooperates with the first limiting part to limit the movement of the arc separation cover in a direction perpendicular to the arc separation plate.

[0013] Based on the above-mentioned embodiments of the present application, the arc separation cover cooperates with the first limiting part on the base through the first limiting structure, thereby limiting the movement of the arc separation cover relative to the base. The first limiting structure can be arranged in multiple forms, and the first limiting part is matched with the setting form of the first limiting structure, thereby effectively improving the assembly stability of the arc separation cover on the base, ensuring that the arc separation cover can play a stable arc separation role, and avoiding the diffusion of arc due to the unstable installation between the arc separation cover and the base.

[0014] In some examples, the first limiting structure comprises a first limiting boss and a second limiting boss, and the first limiting boss and the second limiting boss are arranged on the two opposite side walls of the arc separation cover. The first limiting part comprises a first limiting edge and a second limiting edge, and the first limiting edge and the second limiting edge are arranged on the two opposite side walls of the base. The first limiting edge and the second limiting edge are both parallel to the bottom plate of the base. The first limiting boss abuts against one side of the first limiting edge away from the bottom plate, and the second limiting boss abuts against one side of the second limiting edge close to the bottom plate.

[0015] Based on the above-mentioned embodiments of the present application, the setting form of limiting the position of the arc separation cover in the base by abutting the first limiting boss and the first limiting edge and abutting the second limiting boss and the second limiting edge has the advantages of simple structure, easy assembly and high installation stability. In this matching form, the assembly stability between the arc separation cover and the base is higher and the matching is more compact, effectively reducing the possibility of arc diffusion from the gap between the arc separation cover and the base after passing through the arc extinction chamber, and improving the electrical safety of the switch device.

[0016] In some examples, a second limiting structure is arranged on the arc separation cover, the contact assembly includes a support seat, the contact support is movably arranged on the support seat, a second limiting portion is arranged on the support seat, and the second limiting structure cooperates with the second limiting portion to limit the movement of the arc separation cover in the direction parallel to the arc separation plate.

[0017] Based on the above-mentioned embodiments of the present application, the arc separation cover cooperates with the second limiting portion on the support seat through the second limiting structure, which can limit the movement of the arc separation cover relative to the support seat, further improving the assembly stability of the arc separation cover. The second limiting structure can be arranged in multiple forms, and the arrangement form of the second limiting portion is matched with the second limiting structure.

[0018] In some examples, the second limiting structure includes a limiting column, at least two limiting columns are arranged on the arc separation cover, the second limiting portion includes a positioning slot, at least two positioning slots are arranged, and the limiting column is inserted into the positioning slot. A first stepped groove is arranged on the limiting column, a second stepped groove is arranged in the limiting slot, and the first stepped groove and the second stepped groove are correspondingly clamped.

[0019] Based on the above-mentioned embodiments of the present application, the arrangement form of the multiple limiting columns and the multiple positioning slots corresponding to each other can limit the movement of the arc separation cover relative to the arc separation window in the plane parallel to the arc separation plate, prevent the arc from diffusing out of the arc extinction chamber due to the position offset of the arc separation cover in the assembly window, and improve the arc separation effect of the arc separation cover in the assembly window.

[0020] At the same time, the first stepped groove and the second stepped groove are misaligned and clamped, which can improve the assembly stability between the arc separation cover and the support seat, further ensure that the arc separation cover always remains in a fixed position in the assembly window, and further improve the arc separation effect of the arc separation cover in the assembly window.

[0021] In some examples, the base includes a first base and a second base connected to each other, the first base is arranged with a first arc separation plate near one side of the shell, the second base is arranged with a second arc separation plate near one side of the shell, and the gap between the first arc separation plate and the second arc separation plate after the connection of the first base and the second base forms an assembly window.

[0022] Based on the above-described embodiments of the present application, the base formed by connecting the first and second bases features easy assembly, a simple structure, and high connection stability. Furthermore, the assembly window formed by the gap between the first and second arc-isolating plates facilitates both the assembly of the contact support and the installation of the arc-isolating cover, effectively improving the arc-isolating effect of the switch device, reducing the risk of arc diffusion outside the arc-extinguishing chamber, and enhancing the electrical safety of the switch device.

[0023] In some examples, at least one group of contact assemblies are spaced apart on the base, at least one assembly window is provided on the arc isolation plate, the contact assemblies correspond one-to-one to the assembly windows, at least one arc isolation cover is provided, the arc isolation cover corresponds one-to-one to the assembly windows, and at least one arc isolation cover is provided as an integrated structure.

[0024] In a second aspect, an embodiment of the present application further provides a circuit breaker, comprising a shell, a base, a contact assembly and the above-mentioned arc isolation structure, wherein the shell is connected to the base, the contact assembly is arranged in an installation groove, and part of the contact assembly extends into the shell, and the arc isolation structure is arranged between the base and the shell.

[0025] Based on the above-mentioned embodiments of the present application, the circuit breaker with the above-mentioned arc isolation structure can effectively block the arc generated on the contact assembly in the base of the circuit breaker, reduce the arc from spreading from the base to the shell connected to the base, thereby reducing the risk of damage to other components in the shell, and improving the safety and stability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of the switching device provided in an embodiment of the present application.

[0028] Figure 2 This is a schematic diagram of the overall structure of the base and arc isolation structure provided in an embodiment of the present application.

[0029] Figure 3 This is an exploded view of the base provided in an embodiment of the present application.

[0030] Figure 4 This is a structural diagram of the contact assembly provided in an embodiment of the present application installed in a base.

[0031] Figure 5 This is a schematic structural diagram of the arc shield provided in an embodiment of the present application installed on a base.

[0032] Figure 6 A top view of the base provided for the embodiment of the present application.

[0033] Figure 7 A structure schematic view of the arc separation cover provided for the embodiment of the present application. Figure 6 A sectional view at A-A.

[0034] Figure 8 A structure schematic view of the arc separation cover provided for the embodiment of the present application.

[0035] Figure 9 A structure schematic view of the arc separation cover provided for the embodiment of the present application.

[0036] Figure 10 A structure schematic view of the connection between the arc separation cover and the support provided for the embodiment of the present application.

[0037] Figure 11 A structure schematic view of the support provided for the embodiment of the present application.

[0038] Figure 12 A structure schematic view of the base provided for the embodiment of the present application.

[0039] Explanation of reference signs:

[0040] 100, switch device; 1, housing; 2, base; 21, mounting groove; 22, first limiting edge; 23, second limiting edge; 24, positioning groove; 25, second stepped groove; 26, first base; 27, second base; 3, contact assembly; 31, contact support; 32, support; 33, movable contact; 34, static contact plate; 4, arc separation structure; 41, arc separation plate; 411, assembly window; 42, arc separation cover; 421, limiting hole; 422, limiting groove; 423, first limiting boss; 424, second limiting boss; 425, limiting column; 426, first stepped groove; 5, arc extinguishing assembly. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] The following detailed description of embodiments of the application in the drawings provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0043] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the application, it should be noted that the terms "in", "out" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] In the description of the application, it should also be noted that unless otherwise specified and limited, the terms "set", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0046] Low-voltage switchgear usually includes operating mechanism, tripping mechanism, double gold structure, contact assembly and arc extinguishing assembly, etc. When the low-voltage switchgear is disconnected from the circuit, the moving contact and the static contact in the contact assembly act and separate from each other. During this process, an arc may be generated between the moving contact and the static contact. The generated arc can be extinguished by the arc extinguishing assembly.

[0047] In existing switchgear, such as motor protection circuit breaker, the contact assembly and the arc extinguishing assembly are usually arranged in the base, and other components are usually arranged in the shell connected with the base. The arc generated on the contact assembly is generally completely extinguished by the arc extinguishing assembly, but there is still a situation that the arc may move into the shell to damage other components, resulting in low safety of the motor protection circuit breaker.

[0048] Based on this, the embodiments of the application provide an arc isolation structure and a circuit breaker, which can reduce the risk of arc diffusion and improve the safety of the circuit breaker.

[0049] In order for those skilled in the art to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0050] With reference to Figures 1 to 3 The present embodiment provides an arc separation structure 4 arranged in a switching device 100, the switching device 100 comprising a housing 1 and a base 2 connected to each other, the base 2 having a mounting groove 21, a contact assembly 3 being arranged in the mounting groove 21, the arc separation structure 4 comprising an arc separation plate 41 and an arc separation cover 42. The arc separation plate 41 is arranged on the side of the base 2 close to the housing 1, the arc separation plate 41 and the mounting groove 21 form an arc-extinguishing chamber, the arc separation plate 41 is provided with an assembly window 411, and part of the contact assembly 3 is arranged in the assembly window 411. The arc separation cover 42 is arranged in the assembly window 411, and the arc separation cover 42 can cooperate with the contact assembly 3 to close the assembly window 411.

[0051] Specifically, the switching device 100 in the present embodiment can be a circuit breaker, a contactor or a fuse, etc. The housing 1 and the base 2 in the switching device 100 are connected to each other, and the housing 1 can be provided with control mechanisms and double gold structures, etc. The base 2 is arranged below the housing 1, and the base 2 is provided with the mounting groove 21, and the slot portion of the mounting groove 21 is directed to the housing 1 above the base 2.

[0052] The contact assembly 3 is used to realize the conduction and disconnection of the switching device 100, and the contact assembly 3 is arranged in the mounting groove 21. The contact assembly 3 is directly or indirectly connected to the control mechanism in the housing 1. In the process of controlling the contact assembly 3 to break, arc may be generated on the contact assembly 3, which may damage the double gold structure in the housing 1.

[0053] With reference to Figure 2 and Figure 3 The arc separation plate 41 is arranged on the side of the base 2 close to the housing 1, and the arc separation plate 41 is located at the slot opening of the mounting groove 21. The arc separation plate 41 surrounds the mounting groove 21 to form an arc-extinguishing chamber, and the contact assembly 3 is located in the arc-extinguishing chamber. In this way, the arc generated on the contact assembly 3 is located in the arc-extinguishing chamber, and an arc-extinguishing assembly 5 can be arranged in the arc-extinguishing chamber. The arc-extinguishing assembly 5 can extinguish the arc and prevent the arc from damaging the switching device 100.

[0054] The assembly window 411 on the arc separation plate 41 meets the function of avoiding the contact assembly 3. Compared with the prior art of opening multiple windows on the arc separation plate 41 for convenient connection, the structure of the present embodiment is simpler and more compact. The contact assembly 3 passes through the assembly window 411 and is connected to the control mechanism in the housing 1, so as to facilitate the control of the conduction and disconnection of the contact assembly 3 by the control mechanism.

[0055] With reference to Figure 2The arc separation cover 42 is arranged in the assembly window 411, the arc separation cover 42 can be arranged in a ring shape, the outer contour of the arc separation cover 42 is the same as the contour of the assembly window 411, and the inner contour of the arc separation cover 42 is the same as the part of the contact assembly 3 arranged in the assembly window 411. The arc separation cover 42 arranged in this way can seal the arc-extinguishing chamber together with the arc separation plate 41, so that the arc generated on the contact assembly 3 is in the arc-extinguishing chamber and is completely extinguished by the arc-extinguishing assembly 5, thereby avoiding the spread of the arc from the gap between the contact assembly 3 and the assembly window 411 into the housing 1, effectively reducing the risk of arc spread and improving the safety of other components in the switch device 100.

[0056] Based on the above-mentioned embodiments of the present application, by arranging the arc separation plate 41 on the base 2, the base 2 can be separated from the housing 1, preventing the arc generated by the contact assembly 3 during the breaking process from damaging other components in the housing 1. The arrangement of the arc separation cover 42 can cooperate with the contact assembly 3 arranged in the assembly window 411, without affecting the operation of the contact assembly 3 and the connection between the contact assembly 3 and other components in the housing 1, the assembly window 411 can be closed together with the contact assembly 3, avoiding the spread of the arc from the arc separation window to the housing 1, further reducing the possibility of damage to other components in the housing 1 by the arc, and improving the safety of the switch device 100.

[0057] Referring to Figures 3 to 5 In some examples, the arc separation cover 42 is provided with a limiting hole 421, the limiting hole 421 is in communication with the arc-extinguishing chamber and the side of the arc separation plate 41 close to the housing 1, the contact assembly 3 includes a contact support 31, the contact support 31 is arranged in the limiting hole 421, and the contact support 31 can move along the axis of the limiting hole 421 relative to the arc separation cover 42.

[0058] Referring to Figure 3 The limiting hole 421 is formed on the arc separation cover 42, after the arc separation cover 42 is installed in the assembly window 411, the limiting hole 421 is in communication with the arc-extinguishing chamber and the space outside the arc-extinguishing chamber, i.e., in communication with the arc-extinguishing chamber and the housing 1.

[0059] The contact assembly 3 includes a contact support 31, a support seat 32, and a movable contact 33, the movable contact 33 is arranged on the contact support 31, the contact support 31 is arranged on the support seat 32, the contact support 31 partially extends in the assembly window 411, and the contact support 31 can move along the axis of the assembly window 411 relative to the support seat 32.

[0060] The shape and size of the limiting hole 421 match the shape and size of the part of the contact support 31 extending into the assembly window 411, so that the arc shield 42 can be tightly connected with the contact support 31, and the shape and size of the arc shield 42 match the shape and size of the assembly window 411, so that the arc shield 42 is tightly fitted with the assembly window 411. In summary, the arc shield 42 is sleeved on the contact support 31 and installed in the assembly window 411, which can minimize the gap between the contact support 31 and the assembly window 411, preventing the arc from spreading out of the arc-extinguishing chamber along the contact support 31. At the same time, the position of the contact support 31 can be limited without affecting the movement of the contact support 31, avoiding the shaking of the contact support 31.

[0061] Based on the above-mentioned embodiments of the present application, the limiting hole 421 is provided so that the arc shield 42 can be sleeved on the contact support 31, and the arc shield 42 is arranged between the contact support 31 and the assembly window 411. In this way, without affecting the movement of the contact support 31, the position of the contact support 31 can be limited to avoid shaking of the contact support 31, improve the installation stability of the contact support 31, and also avoid the arc spreading out of the arc-extinguishing chamber due to the large gap between the contact support 31 and the assembly window 411, reducing the risk caused by the arc spreading.

[0062] Referring to Figures 3 to 5 In some examples, the arc shield 42 is further provided with a limiting slot 422, the limiting slot 422 is arranged on the outer side wall of the arc shield 42, the limiting slot 422 is communicated between the arc-extinguishing chamber and the side of the arc shield 41 close to the shell 1, and the contact assembly 3 further comprises a static contact plate 34, the static contact plate 34 is arranged to pass through the limiting slot 422.

[0063] Referring to Figure 3 and Figure 5 The limiting slot 422 is arranged on the outer side wall of the arc shield 42, i.e. on the outer surface of the arc shield 42, and the arrangement direction of the limiting slot 422 is the same as that of the limiting hole 421, and the limiting slot 422 is also communicated between the arc-extinguishing chamber and the space outside the arc-extinguishing chamber, i.e. between the arc-extinguishing chamber and the shell 1.

[0064] Referring to Figure 3 and Figure 4 The contact assembly 3 further comprises a static contact plate 34, the static contact plate 34 partially extends into the shell 1 for connecting external wires, and the remaining part passes through the assembly window 411 and forms a static contact in the arc-extinguishing chamber.

[0065] In the embodiment of the present application, the shape and size of the limiting groove 422 match those of the stationary touch plate 34, allowing a tight fit between the limiting groove 422 and the stationary touch plate 34. Furthermore, the arc shield 42 and the assembly window 411 maintain a tight fit, minimizing the spread of arcs through the gap between the stationary touch plate 34 and the assembly window 411. The limiting groove 422 can be enclosed within the assembly window 411 with the sidewalls of the assembly window 411 to form a hole-like structure, thereby positioning the stationary touch plate 34 and preventing deviation in the installation position of the stationary touch plate 34.

[0066] In addition, the positioning function of the limiting hole 421 on the arc shield 42 for the contact support 31 is to position the moving contact 33, and the positioning function of the limiting groove 422 for the static contact plate 34 is to position the static contact. With the cooperation of the limiting hole 421 and the limiting groove 422, the moving contact 33 and the static contact can be positioned at the same time, so that the relative position between the moving contact 33 and the static contact remains fixed, which helps to reduce the wear between the moving contact 33 and the static contact while ensuring the reliability of the electrical connection, thereby extending the service life of the contact assembly 3 and reducing the maintenance frequency and cost.

[0067] Based on the above-mentioned embodiments of the present application, the setting of the limiting groove 422 is similar to that of the limiting hole 421. The limiting groove 422 can limit the static touch plate 34 in the contact assembly 3, thereby improving the installation stability of the static touch plate 34 passing through the assembly window 411. At the same time, the close fit between the limiting groove 422 and the static touch plate 34 in the assembly window 411 can reduce the gap between the static touch plate 34 and the assembly window 411, thereby reducing the risk of the arc spreading out of the arc extinguishing cavity.

[0068] Reference Figures 6 to 9 In some examples, a first limiting structure is provided on the arc isolation cover 42, and a first limiting portion is provided on the base 2. The first limiting structure cooperates with the first limiting portion to limit the movement of the arc isolation cover 42 in a direction perpendicular to the arc isolation plate 41.

[0069] Based on the above-mentioned embodiments of the present application, the arc-isolating cover 42 cooperates with the first limiting portion on the base 2 through the first limiting structure, which can limit the movement of the arc-isolating cover 42 relative to the base 2. The first limiting structure can be set in a variety of forms, and the first limiting portion matches the setting form of the first limiting structure, which can effectively improve the assembly stability of the arc-isolating cover 42 on the base 2, ensure that the arc-isolating cover 42 can play a stable arc-isolating role, and avoid the occurrence of arc diffusion between the arc-isolating cover 42 and the base 2 due to unstable installation.

[0070] For example, referring to Figures 6 to 9, the first limiting structure includes a first limiting boss 423 and a second limiting boss 424, and the first limiting boss 423 and the second limiting boss 424 are arranged on the two opposite side walls of the arc separation cover 42. The first limiting portion includes a first limiting edge 22 and a second limiting edge 23, and the first limiting edge 22 and the second limiting edge 23 are arranged on the two opposite side walls of the base 2, and the first limiting edge 22 and the second limiting edge 23 are both parallel to the bottom plate of the base 2. The first limiting boss 423 is abutted on one side of the first limiting edge 22 away from the bottom plate, and the second limiting boss 424 is abutted on one side of the second limiting edge 23 close to the bottom plate.

[0071] Specifically, the arc separation cover 42 includes a first side wall and a second side wall, the first side wall and the second side wall are two opposite side walls of the arc separation cover 42, the first limiting boss 423 is arranged on one side of the first side wall away from the second side wall, and the second limiting boss 424 is arranged on one side of the second side wall away from the first side wall, so that the arc separation cover 42 can be limited and installed with the base 2 from two opposite positions.

[0072] Further, the base 2 includes a third side wall and a fourth side wall, and the third side wall and the fourth side wall are two opposite side walls of the base 2. Among them, the third side wall is opposite to the first side wall, and the fourth side wall is opposite to the second side wall. The first limiting edge 22 is arranged at a position of the third side wall close to the shell 1, and the second limiting edge 23 is arranged at a position of the fourth side wall close to the shell 1. The first limiting edge 22 and the second limiting edge 23 are both parallel to the bottom plate of the base 2, so that when the first limiting boss 423 and the second limiting boss 424 are respectively abutted on the first limiting edge 22 and the second limiting edge 23, the arc separation cover 42 can be limited to move in a direction perpendicular to the bottom plate of the base 2.

[0073] With reference to Figures 6 to 9 , the first limiting boss 423 is abutted on one side of the first limiting edge 22 away from the bottom plate, and the second limiting boss 424 is abutted on one side of the first limiting edge 22 close to the bottom plate, so that when the first limiting boss 423 and the second limiting boss 424 are respectively abutted on the first limiting edge 22 and the second limiting edge 23, the position of the arc separation cover 42 can be simultaneously limited from two opposite directions, so as to fix the arc separation cover 42 in the base 2 in a direction perpendicular to the bottom plate of the base 2.

[0074] Based on the above-mentioned embodiments of the present application, the first limiting boss 423 and the first limiting edge 22 are abutted, and the second limiting boss 424 and the second limiting edge 23 are abutted to limit the position of the arc separation cover 42 in the base 2, which has the advantages of simple structure, easy assembly and high installation stability. Under this matching form, the assembly stability between the arc separation cover 42 and the base 2 is higher and the matching is tighter, which effectively reduces the possibility of arc diffusion through the gap between the arc separation cover 42 and the base 2 from the arc extinguishing chamber, and improves the electrical safety of the switching device 100.

[0075] The first limiting boss 423 and the second limiting boss 424 can also be arranged on the same side wall of the arc separation cover 42, and correspondingly, the first limiting edge 22 and the second limiting edge 23 are arranged on the same side wall of the base 2. In this way, the arrangement can also limit the position of the arc separation cover 42, and has the same technical effect as the foregoing embodiment, and will not be described here again.

[0076] In another embodiment, the first limiting boss 423 can abut against one side of the arc separation plate 41 close to the shell 1, and the second limiting boss 424 can abut against the other side of the arc separation plate 41 away from the shell 1. In this way, the position of the arc separation cover 42 can be limited by the arc separation plate 41, and the assembly stability of the arc separation cover 42 relative to the base 2 can also be improved.

[0077] In an optional embodiment, the number of limiting bosses can be multiple, and the multiple limiting bosses are arranged at intervals on the circumferential side wall of the arc separation cover 42. The multiple limiting bosses can abut against the arc separation plate 41 or the limiting edge arranged on the base 2. In this way, the assembly stability between the arc separation cover 42 and the base 2 can be further improved.

[0078] Referring to Figures 8 to 11 In some examples, the arc separation cover 42 is provided with a second limiting structure, the contact assembly 3 includes a support seat 32, and the contact support 31 is movably arranged on the support seat 32. The support seat 32 is provided with a second limiting part, and the second limiting structure cooperates with the second limiting part to limit the movement of the arc separation cover 42 in a direction parallel to the arc separation plate 41.

[0079] Based on the foregoing embodiments of the present application, the arc separation cover 42 cooperates with the second limiting part on the support seat 32 through the second limiting structure, which can limit the movement of the arc separation cover 42 relative to the support seat 32, and further improve the assembly stability of the arc separation cover 42. The second limiting structure can be arranged in multiple forms, and the arrangement form of the second limiting part is matched with the second limiting structure.

[0080] Referring to Figures 8 to 11 For example, the second limiting structure includes a limiting column 425, and the limiting column 425 is provided in at least two. The at least two limiting columns 425 are arranged at intervals on the arc separation cover 42. The second limiting part includes a positioning groove 24, and the positioning groove 24 is provided in at least two. The limiting column 425 is correspondingly inserted into the positioning groove 24. The limiting column 425 is provided with a first stepped groove 426, the limiting groove 422 is provided with a second stepped groove 25, and the first stepped groove 426 is correspondingly clamped with the second stepped groove 25.

[0081] Specifically, the second limiting structure is a limiting column 425, and the limiting column 425 is provided with at least two, that is, the position of the arc-shielding cover 42 can be limited through at least two directions. The at least two limiting columns 425 are arranged at intervals on the outer side wall of the arc-shielding cover 42, and the limiting column 425 extends to the direction of the support base 32 relative to the arc-shielding cover 42.

[0082] The second limiting part is a positioning groove 24, and the positioning groove 24 is arranged on the support base 32. The positioning groove 24 is arranged in one-to-one correspondence with the limiting column 425. The at least two limiting columns 425 are correspondingly inserted into the at least two positioning grooves 24, so that the arc-shielding cover 42 can be limited and mounted on the support base 32.

[0083] Referring to Figure 8 and Figure 9 In the embodiment of the present application, the limiting column 425 is provided with four, and the four limiting columns 425 are arranged at intervals on the outer side wall of the arc-shielding cover 42. Two of the limiting columns 425 are located on the same side wall of the arc-shielding cover 42, and the other two limiting columns 425 are located on the opposite side walls.

[0084] Further, the support base 32 includes two support plates arranged at intervals, and the positioning groove 24 is correspondingly provided with four, of which two positioning grooves 24 are located on one side of the same support plate close to the other support plate, and the other two positioning grooves 24 are the same.

[0085] Referring to Figure 10 In the above setting form, the four limiting columns 425 are correspondingly inserted into the four positioning grooves 24, so that the arc-shielding cover 42 can be limited from four directions, effectively improving the assembly stability of the arc-shielding cover 42, and ensuring that the arc-shielding cover 42 remains fixed in the assembly window 411.

[0086] Based on the above-mentioned embodiments of the present application, the setting form that the plurality of limiting columns 425 and the plurality of positioning grooves 24 are correspondingly matched can limit the movement of the arc-shielding cover 42 relative to the arc-shielding window in the plane parallel to the arc-shielding plate 41, prevent the arc-shielding cover 42 from causing the arc to spread out of the arc-extinguishing chamber due to position deviation in the assembly window 411, and improve the arc-shielding effect of the arc-shielding cover 42 in the assembly window 411. At the same time, the misaligned clamping of the first stepped groove 426 and the second stepped groove 25 can improve the assembly stability between the arc-shielding cover 42 and the support base 32, and further ensure that the arc-shielding cover 42 always remains in a fixed position in the assembly window 411, thereby further improving the arc-shielding effect of the arc-shielding cover 42 in the assembly window 411.

[0087] The assembly stability between the arc-shielding cover 42 and the support base 32 can be improved, which is conducive to limiting the movement of the arc-shielding cover 42 in the direction parallel to the arc-shielding plate 41 through the support base 32, avoiding the arc-shielding cover 42 from causing the arc to spread out of the arc-extinguishing chamber due to position deviation in the assembly window 411, and improving the arc-shielding effect of the arc-shielding cover 42 in the assembly window 411.

[0088] Referring toFigure 12 In some examples, the base 2 comprises a first base 26 and a second base 27 connected together, the first base 26 is provided with a first arc separation plate 41 close to one side of the housing 1, and the second base 27 is provided with a second arc separation plate 41 close to one side of the housing 1, and the gap between the first arc separation plate 41 and the second arc separation plate 41 forms an assembly window 411 after the first base 26 and the second base 27 are connected.

[0089] Specifically, the base 2 comprises a first base 26 and a second base 27, which can be connected to each other in the horizontal direction to form a complete base 2. The first base 26 has a first mounting groove 21, and the second base 27 has a second mounting groove 21. After the first base 26 and the second base 27 are connected, the first mounting groove 21 and the second mounting groove 21 form a complete mounting groove 21.

[0090] The first base 26 is provided with a first arc separation plate 41 close to one side of the housing 1, that is, the first mounting groove 21 is provided with a first arc separation plate 41 at the slot opening of the housing 1. The second base 27 is provided with a second arc separation plate 41 close to one side of the housing 1, that is, the second mounting groove 21 is provided with a second arc separation plate 41 at the slot opening of the housing 1. The first arc separation plate 41 and the second arc separation plate 41 are in the same plane, and the first arc separation plate 41 and the second arc separation plate 41 form a complete arc separation plate 41 after the first base 26 and the second base 27 are connected.

[0091] The first base 26 and the second base 27 are connected, and the first arc separation plate 41 and the second arc separation plate 41 do not completely contact, and the space between the first arc separation plate 41 and the second arc separation plate 41 forms an assembly window 411 for avoiding the contact support 31 in the contact assembly 3. In this way, the assembly operation is facilitated, and the first base 26 and the second base 27 can be combined and connected only after the contact assembly 3 is installed into the first mounting groove 21 and the second mounting groove 21, without the need to align the contact support 31 and the assembly window 411 for installation. In addition, the assembly window 411 formed in this way reduces the processing procedures of separately opening the window, thereby reducing the production cost.

[0092] Based on the above-mentioned embodiments of the present application, the base 2 formed by connecting the first base 26 and the second base 27 has the characteristics of convenient assembly, simple structure, and high connection stability. At the same time, the assembly window 411 is formed by the gap between the first arc separation plate 41 and the second arc separation plate 41, which facilitates the assembly of the contact support 31 and the installation of the arc separation cover 42, effectively improves the arc separation effect of the switch device 100, reduces the risk of arc diffusion out of the arc chamber, and improves the electrical safety of the switch device 100.

[0093] Reference Figure 2In some examples, at least one set of contact assemblies 3 is arranged on the base 2, at least one assembly window 411 is arranged on the arc separation plate 41, the contact assembly 3 corresponds to the assembly window 411 one by one, and the arc separation cover 42 is provided with at least one arc separation cover 42 corresponding to the assembly window 411 one by one. The at least one arc separation cover 42 is arranged in an integrated structure.

[0094] In the switch device 100, in order to realize the conduction of at least one circuit, at least one set of contact assemblies 3 is usually arranged. In the embodiment of the present application, the switch device 100 is arranged as a motor protection circuit breaker, which needs to realize the conduction of three circuits, so the contact assembly 3 is arranged in three sets, and each set of contact assemblies 3 corresponds to one circuit.

[0095] Specifically, two partitions are arranged in the base 2, the two partitions are perpendicular to the bottom plate of the base 2, and the two partitions separate the mounting groove 21 into three parallel mounting spaces. The three sets of contact assemblies 3 are arranged in the three mounting spaces correspondingly.

[0096] The arc separation plate 41 is arranged at the slot opening of the mounting groove 21 towards the shell 1, and the arc separation plate 41 encloses the three mounting spaces to form three parallel arc extinction chambers respectively. Each set of contact assemblies 3 generates an arc in the corresponding arc extinction chamber. The arc separation plate 41 is provided with three assembly windows 411, and the positions of the three assembly windows 411 correspond to the three arc extinction chambers. Each set of contact assemblies 3 is arranged in the corresponding assembly window 411.

[0097] The number of arc separation covers 42 corresponds to the number of assembly windows 411 and contact assemblies 3. The three assembly windows 411 are arranged in parallel on the arc separation plate 41, and the corresponding three arc separation covers 42 are arranged in parallel in the assembly windows 411.

[0098] Among them, the three arc separation covers 42 are integrally formed, which facilitates assembly and improves assembly efficiency. At the same time, the integral formation of the three arc separation covers 42 can also appropriately reduce the spacing between each arc separation cover 42, so that the three arc separation covers 42 have an interference fit with the corresponding assembly windows 411 when assembled into the assembly windows 411, thereby improving the assembly stability of the arc separation cover 42.

[0099] The arc separation cover 42 with an integrated structure also has higher strength and stability. For example, a high-strength plastic material can be used to manufacture the integrated arc separation cover 42 through an injection molding process. The design of the integrated arc separation cover 42 can also simplify the installation process. In addition, the integrated structure can also reduce the number of parts, reduce production costs, and improve the reliability of the entire device.

[0100] Reference Figure 1 and Figure 2An embodiment of the present application also provides a circuit breaker, including a shell 1, a base 2, a contact assembly 3 and the above-mentioned arc isolation structure 4, the shell 1 is connected to the base 2, the contact assembly 3 is arranged in the mounting groove 21, and part of the contact assembly 3 extends into the shell 1, and the arc isolation structure 4 is arranged between the base 2 and the shell 1.

[0101] Based on the above-mentioned embodiments of the present application, the circuit breaker having the above-mentioned arc isolation structure 4 can effectively block the arc generated on the contact assembly 3 in the base 2 of the circuit breaker, reduce the arc from spreading from the base 2 to the shell 1 connected to the base 2, thereby reducing the risk of damage to other components in the shell 1 and improving the safety and stability of the circuit breaker.

[0102] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An arc isolation structure, characterized in that: The switch device includes a housing and a base connected to each other, the base has a mounting groove, and a contact assembly is arranged in the mounting groove. The arc isolation structure includes: An arc isolation plate is provided on a side of the base close to the housing, the arc isolation plate and the mounting groove enclose an arc extinguishing cavity, an assembly window is provided on the arc isolation plate, and part of the contact assembly is passed through the assembly window; An arc shield is provided in the assembly window, and the arc shield can cooperate with the contact assembly to close the assembly window.

2. The arc isolation structure according to claim 1, characterized in that: A limiting hole is provided on the arc extinguishing cover, and the limiting hole connects the arc extinguishing chamber and the side of the arc extinguishing plate close to the shell. The contact assembly includes a contact support, and the contact support is correspondingly arranged in the limiting hole, and the contact support can move relative to the arc extinguishing cover along the axis of the limiting hole.

3. The arc isolation structure according to claim 2, characterized in that: A limiting groove is also provided on the arc isolation cover, and the limiting groove is provided on the outer wall of the arc isolation cover. The limiting groove connects the arc extinguishing chamber and the side of the arc isolation plate close to the shell. The contact assembly also includes a static touch plate, and the static touch plate is correspondingly arranged in the limiting groove.

4. The arc isolation structure according to claim 1, characterized in that: The arc isolation cover is provided with a first limiting structure, and the base is provided with a first limiting portion. The first limiting structure cooperates with the first limiting portion to limit the movement of the arc isolation cover in a direction perpendicular to the arc isolation plate.

5. The arc isolation structure according to claim 4, characterized in that: The first limiting structure includes a first limiting boss and a second limiting boss, and the first limiting boss and the second limiting boss are arranged on two opposite side walls of the arc isolation cover; The first limiting portion includes a first limiting edge and a second limiting edge, the first limiting edge and the second limiting edge are arranged on two opposite side walls of the base, and the first limiting edge and the second limiting edge are both parallel to the bottom plate of the base; The first limiting boss abuts against a side of the first limiting edge facing away from the bottom plate, and the second limiting boss abuts against a side of the second limiting edge close to the bottom plate.

6. The arc isolation structure according to claim 3, characterized in that: A second limiting structure is provided on the arc isolation cover, the contact assembly includes a support base, the contact support is movably provided on the support base, a second limiting portion is provided on the support base, and the second limiting structure cooperates with the second limiting portion to limit the movement of the arc isolation cover in a direction parallel to the arc isolation plate.

7. The arc isolation structure according to claim 6, characterized in that: The second limiting structure includes a limiting column, at least two of which are provided, and at least two limiting columns are spaced apart and arranged on the arc isolation cover; the second limiting portion includes a positioning groove, at least two of which are provided, and the limiting columns are correspondingly inserted into the positioning grooves; The limiting column is provided with a first stepped groove, the limiting groove is provided with a second stepped groove, and the first stepped groove is correspondingly engaged with the second stepped groove.

8. The arc isolation structure according to claim 1, characterized in that: The base includes a first base and a second base connected to each other, a first arc isolation plate is provided on a side of the first base close to the shell, and a second arc isolation plate is provided on a side of the second base close to the shell. After the first base and the second base are connected, the gap between the first arc isolation plate and the second arc isolation plate forms the assembly window.

9. The arc isolation structure according to claim 1, characterized in that: At least one group of contact assemblies is arranged at intervals on the base, at least one assembly window is provided on the arc isolation plate, and the contact assemblies correspond to the assembly windows one-to-one, and at least one arc isolation cover is provided, and the arc isolation cover corresponds to the assembly window one-to-one, and at least one arc isolation cover is arranged as an integrated structure.

10. A circuit breaker, characterized in that: It includes a shell, a base, a contact assembly and an arc isolation structure as described in any one of claims 1 to 9, the shell is connected to the base, the contact assembly is arranged in the mounting groove, and part of the contact assembly extends into the shell, and the arc isolation structure is arranged between the base and the shell.

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