Protective cover and circuit breaker

Abstract

The protective cover comprises a top plate and a side plate, and the top plate is connected with the side plate. Clamping ribs are arranged on the side plates and / or the top plate, and the clamping ribs are used for being matched with first clamping grooves of a circuit breaker shell; wherein the clamping rib comprises a hollow protruding part, a first pre-mounting hole is formed in the position, corresponding to the hollow protruding part, of the upper surface of the top plate, the first pre-mounting hole is communicated with the hollow part of the hollow protruding part, and the first pre-mounting hole is used for allowing a self-tapping screw to penetrate in so that the hollow protruding part and the self-tapping screw can form the effect of an expansion screw; the connecting structure has the characteristic of high connecting strength.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical equipment, and relates to a molded case circuit breaker, in particular to a protective cover of a molded case circuit breaker. Background Art

[0002] In order to protect the terminals on both sides of the existing molded case circuit breaker or prevent arc ejection, protective covers are often added to the terminals on both sides for protection.

[0003] The existing installation structure of the protective cover is as follows:

[0004] At least two groups of terminal slots are provided on the circuit breaker housing, and a first clamping slot is provided between each two terminal slots. The protective cover includes a top plate and a side plate connected to each other, and a clamping rib matching the first clamping slot is provided on the side plate, and the clamping rib is also connected to the top plate.

[0005] A pre-installation hole is provided on the upper surface of the circuit breaker housing and a pre-installation hole is also provided on the top plate.

[0006] During installation, move the protective cover to the top of the circuit breaker housing, align the clamping rib with the first clamping slot and push the protective cover downward until the top plate of the protective cover abuts against the upper surface of the circuit breaker housing, and then align the self-tapping screws with the two pre-installation holes and screw them in to complete the assembly.

[0007] For example, a circuit breaker disclosed in CN211295002U adopts the above structure.

[0008] The fastening method of the above structure has limited strength, so it is necessary to design a protective cover with better connection strength. Summary of the invention

[0009] In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art and to provide a protective cover and a circuit breaker that can improve the connection strength.

[0010] The utility model provides: a protective cover, which includes a top plate and a side plate, the top plate is connected to the side plate; the side plate and / or the top plate are provided with a clamping rib, the clamping rib is used to cooperate with a first clamping groove of a circuit breaker housing; wherein the clamping rib includes a hollow protrusion, and a first pre-installation hole is opened at a position corresponding to the hollow protrusion on the upper surface of the top plate, the first pre-installation hole is connected to the hollow part of the hollow protrusion, and the first pre-installation hole is used for self-tapping screws to penetrate, so that the hollow protrusion and the self-tapping screw form the effect of an expansion screw.

[0011] A part of the clamping rib is set as a hollow protrusion, and a self-tapping screw can be used to cooperate with it to form an effect similar to an expansion screw, so that it is fastened to the first clamping groove. With this structure, the connection strength will be better than the existing technology, and such a structure does not require additional holes for fastening self-tapping screws on the circuit breaker housing, and only the original first clamping groove can be used, which will help improve the processing efficiency of the product.

[0012] In some embodiments of the present application, the clamping rib also includes a solid protrusion, the hollow protrusion is connected to the solid protrusion in the axial direction, and the hollow protrusion is located above the solid protrusion; or, the clamping rib also includes a solid protrusion, the hollow protrusion is connected to the solid protrusion in the axial direction, and the hollow protrusion is located above the solid protrusion, and the size of the hollow protrusion in the radial direction is larger than the size of the solid protrusion in the radial direction.

[0013] In some embodiments of the present application, the hollow protrusion is provided with abutment ribs in the radial direction and / or the hollow protrusion is provided with a through groove in the radial direction.

[0014] In some embodiments of the present application, reinforcing ribs are provided on the top panel and the side panel; and / or, the side panel is divided into at least two pole corresponding areas, the retaining rib is provided between two adjacent pole corresponding areas, and a through hole is provided on the pole corresponding area; and / or, at least two clearance holes are provided on the side panel, the side panel is divided into at least two pole corresponding areas, and each clearance hole is provided below the corresponding pole corresponding area; and / or, a second retaining groove is provided on the outer surface of the side panel, and the second retaining groove is provided in parallel with the retaining rib.

[0015] A circuit breaker comprises a circuit breaker housing, at least two terminal slots are arranged at both ends of the circuit breaker housing, a first clamping slot is opened on the side surface of the circuit breaker housing located at the terminal slot, and the first clamping slot is located between two adjacent terminal slots; wherein, the above-mentioned protective cover is arranged on at least one end of the circuit breaker housing, and the clamping rib is clamped in the first clamping slot; and a self-tapping screw is also included, which is inserted into a first pre-installed hole so that a hollow protrusion expands and forms a tight fit with the slot wall of the first clamping slot.

[0016] The self-tapping screw and the hollow protrusion cooperate to form an effect similar to that of an expansion screw, so that the two are firmly fastened to the first slot. With this structure, the connection strength will be better than the existing technology, and such a structure does not require additional holes for fastening the self-tapping screws to be opened on the circuit breaker housing, and only the original first slot can be used, which will help improve the processing efficiency of the product.

[0017] In some embodiments of the present application, the top plate is arranged not to exceed the upper surface of the circuit breaker housing, and the top plate has matching parts whose number corresponds to the number of terminal slots, and the matching parts are embedded in the corresponding terminal slots.

[0018] In some embodiments of the present application, at least one matching portion is provided with a hook, and the hook is engaged with the circuit breaker housing.

[0019] In some embodiments of the present application, the circuit breaker housing includes an upper cover and a base, the upper cover is provided with a first card slot upper section, the base is provided with a first card slot lower section, the first card slot upper section and the first card slot lower section together form a first card slot; the hollow protrusion is located in the first card slot upper section.

[0020] A protective cover comprises a top plate and a side plate, wherein the top plate is connected to the side plate; wherein a hollow protrusion extends downwardly from the top plate, a first pre-installation hole is provided on the upper surface of the top plate corresponding to the position of the hollow protrusion, the first pre-installation hole is connected to the hollow part of the hollow protrusion, and the first pre-installation hole is used for self-tapping screws to penetrate so that the hollow protrusion and the self-tapping screws form the effect of expansion screws.

[0021] A hollow protrusion is arranged on the top plate, and a self-tapping screw can be used to cooperate with it to form an effect similar to that of an expansion screw, and the connection strength will be better than that of the prior art.

[0022] A circuit breaker comprises a circuit breaker housing, on which a second pre-installation hole is formed; wherein, the circuit breaker housing also comprises the above-mentioned protective cover and self-tapping screws, wherein a hollow protrusion is inserted into the second pre-installation hole, and the self-tapping screw is penetrated into the first pre-installation hole, so that the hollow protrusion expands to form a tight fit with the hole wall of the second pre-installation hole.

[0023] The self-tapping screw cooperates with the hollow protrusion to form an effect similar to that of an expansion screw, so that the two are firmly fastened in the second pre-installation hole, and the connection strength will be better than that of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model 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.

[0025] Figure 1 It is a structural schematic diagram of an implementation method of the protective cover and the circuit breaker in Example 1 of the utility model;

[0026] Figure 2 Shows Figure 1 Schematic diagram of the structure after removing the protective cover;

[0027] Figure 3-4 A schematic diagram showing two different axial orientations of one embodiment of the shield;

[0028] Figure 5 A cross-sectional view showing an embodiment of the cooperation between the shield and the circuit breaker without self-tapping screws installed;

[0029] Figure 6 A cross-sectional view showing the assembly of self-tapping screws in one embodiment of the cooperation between the shield and the circuit breaker;

[0030] Figure 7 A partial cross-sectional view of a hook engagement portion in one embodiment of engagement between a shield and a circuit breaker is shown;

[0031] Figure 8 It is a schematic diagram of a modified implementation of the cooperation between the protective cover and the circuit breaker in Example 1 of the utility model. Implementation

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. Example

[0035] Refer to the attached Figure 1-8 As shown, a circuit breaker includes a circuit breaker housing and a protective cover 40.

[0036] The circuit breaker housing includes a base 10 and an upper cover 20, and the base 10 and the upper cover 20 are fastened by bolts. Three sets of terminal slots are provided on both sides of the circuit breaker housing, and the terminal slots here are used to place terminal blocks for wiring with external load terminals and power terminals. The terminal slots here are formed by the base 10 and the upper cover 20.

[0037] Two first card slots 30 are arranged on the side surfaces of the base 10 and the upper cover 20 near the terminal slots, and the first card slot 30 here is arranged between two adjacent terminal slots. A first card slot upper section 30a is arranged on the base 10, and a first card slot upper section 30a is arranged on the upper cover 20, and the first card slot upper section 30a and the first card slot lower section 30b together form the first card slot 30.

[0038] The protective cover 40 includes a top plate 41 and a side plate 42, and the top plate 41 and the side plate 42 are connected to form a substantially L-shaped structure. A clamping rib 43 is provided on the side plate 42 and the top plate 41, and the clamping rib 43 is used to cooperate with the first clamping groove 30 of the circuit breaker housing, that is, the protective cover 40 can be clamped into the first clamping groove 30 through the clamping rib 43.

[0039] The clamping rib 43 includes a hollow protrusion 43a and a solid protrusion 43b along its axial direction, and the hollow protrusion 43a is located above the solid protrusion 43b. A first pre-installation hole 43c is opened on the upper surface of the top plate 41 at a position corresponding to the location of the hollow protrusion 43a.

[0040] During installation, the protective cover 40 is moved to the top of the circuit breaker housing, the clamping rib 43 is aligned with the first clamping slot 30, and then the protective cover 40 is pushed downward until the protective cover 40 is fully matched with the circuit breaker housing, and then the self-tapping screw 60 is screwed into the first pre-installation hole 43c so that the hollow protrusion 43a expands and abuts against the groove wall of the first clamping slot 30, mainly against the groove wall of the upper section 30a of the first clamping slot. Such a structure forms an effect similar to that of an expansion screw, which can greatly improve the connection strength.

[0041] The radial dimension of the hollow protrusion 43 a is greater than the radial dimension of the solid protrusion 43 b . This design allows the hollow protrusion 43 a to form a tight fit with the wall of the first slot 30 with only a slight expansion.

[0042] The hollow protrusion 43a is provided with abutment ribs 43a1 in the radial direction. With such a design, when the hollow protrusion 43a expands, the abutment ribs 43a1 can abut against the groove wall of the first groove 30. Such a structure can also enable the hollow protrusion 43a to form a tightening effect with only slight expansion.

[0043] A through groove may be provided in the hollow protrusion 43a in the radial direction. The provision of the through groove may make it easier for the hollow protrusion 43a to expand.

[0044] In order to ensure the strength of the protective cover 40 , reinforcing ribs 412 are provided on the top plate 41 and the side plates 42 .

[0045] In the present application, since there are three terminal slots, the side plate 42 has three pole corresponding areas 413, where the pole corresponding areas 413 correspond to the terminal slots one by one. Through holes 414 are also provided on the pole corresponding areas 413, which are conducive to exhaust.

[0046] The side plate 42 is also provided with three clearance holes 415 , which are arranged below the corresponding pole corresponding areas 413 , so as to facilitate the user to carry out wiring.

[0047] When the protective cover 40 is installed, the top plate 41 does not exceed the upper surface of the circuit breaker housing (that is, the upper surface of the upper cover 20). Here, the top plate 41 has three matching parts 416, and the matching parts 416 correspond to the terminal slots one by one. After installation, the matching parts 416 are embedded in the terminal slots (the part located at the upper cover 20).

[0048] In order to improve the strength of the protective cover 40, a hook 417 is further provided on the matching portion 416, and the hook 417 is hooked on the upper cover 20 to form a snap fit. A disassembly opening 418 is also provided on the matching portion 416, and the design of the disassembly opening 418 will facilitate the insertion of a tool into the disassembly opening 418 to release the fit between the hook 417 and the circuit breaker housing.

[0049] A second clamping groove 421 is formed on the outer surface of the side plate 42 . The second clamping groove 421 is arranged parallel to the clamping rib 43 . The second clamping groove 421 can be used to clamp the phase partition.

[0050] As a modified implementation, the hollow protrusion 43a may not be provided on the clamping rib 43: Figure 8 As shown, a hollow protrusion 43a extends downward on the top plate 41, and a first pre-installation hole 43c is provided on the upper surface of the top plate 41 corresponding to the position of the hollow protrusion 43a. The first pre-installation hole 43c is connected to the hollow part of the hollow protrusion 43a, so that after the self-tapping screw 60 is inserted, the hollow protrusion 43a and the self-tapping screw 60 can also form an expansion screw effect. In this embodiment, a second pre-installation hole 50 is provided on the upper cover 20 of the circuit breaker, and the hollow protrusion 43a is inserted into the upper cover 20 of the circuit breaker. This structure can also improve the connection strength.

[0051] Although a three-pole circuit breaker is used as an example above, this protective cover 40 can also be made into a two-pole or a four-pole circuit breaker by simply changing the number of corresponding hollow protrusions, retaining ribs 43, terminal slots, etc.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A protective cover, comprising a top plate and a side plate, wherein the top plate is connected to the side plate; the side plate and / or the top plate are provided with a clamping rib, which is used to cooperate with a first clamping groove of a circuit breaker housing; characterized in that: The clamping rib includes a hollow protrusion, and a first pre-installation hole is opened on the upper surface of the top plate at a position corresponding to the hollow protrusion, the first pre-installation hole is connected to the hollow part of the hollow protrusion, and the first pre-installation hole is used for the self-tapping screw to penetrate, so that the hollow protrusion and the self-tapping screw form the effect of an expansion screw.

2. A protective cover according to claim 1, characterized in that: The clamping rib also includes a solid protrusion, the hollow protrusion is connected to the solid protrusion in the axial direction, and the hollow protrusion is located above the solid protrusion; or, the clamping rib also includes a solid protrusion, the hollow protrusion is connected to the solid protrusion in the axial direction, and the hollow protrusion is located above the solid protrusion, and the size of the hollow protrusion in the radial direction is larger than the size of the solid protrusion in the radial direction.

3. A protective cover according to claim 1, characterized in that: The hollow protrusion is provided with abutment ribs in the radial direction and / or the hollow protrusion is provided with a through groove in the radial direction.

4. A protective cover according to claim 1, characterized in that: Reinforcing ribs are arranged on the top plate and the side plate; and / or, the side plate is divided into at least two pole corresponding areas, the retaining rib is arranged between two adjacent pole corresponding areas, and a through hole is opened on the pole corresponding area; and / or, at least two clearance holes are opened on the side plate, the side plate is divided into at least two pole corresponding areas, and each clearance hole is arranged below the corresponding pole corresponding area; and / or, a second clamping groove is opened on the outer surface of the side plate, and the second clamping groove and the retaining rib are arranged in parallel.

5. A circuit breaker, comprising a circuit breaker housing, at least two terminal slots are provided at both ends of the circuit breaker housing, a first card slot is provided on the side surface of the circuit breaker housing located at the terminal slot, and the first card slot is located between two adjacent terminal slots; characterized in that: A protective cover as described in any one of claims 1 to 4 is provided on at least one end of the circuit breaker housing, and the clamping rib is clamped in the first slot; it also includes a self-tapping screw, which is inserted into the first pre-installed hole so that the hollow protrusion expands and forms a tight fit with the slot wall of the first slot.

6. A circuit breaker according to claim 5, characterized in that: The top plate is arranged so as not to exceed the upper surface of the circuit breaker housing, and the top plate has matching parts whose number corresponds to the number of the terminal slots, and the matching parts are embedded in the corresponding terminal slots.

7. A circuit breaker according to claim 6, characterized in that: At least one matching part is provided with a hook, which is locked with the circuit breaker housing; or at least one matching part is provided with a hook, which is locked with the circuit breaker housing, and the matching part is also provided with a disassembly opening.

8. A circuit breaker according to claim 5, characterized in that: The circuit breaker housing includes an upper cover and a base. The upper cover is provided with a first slot upper section, and the base is provided with a first slot lower section. The first slot upper section and the first slot lower section together form a first slot, and the hollow protrusion is located in the first slot upper section.

9. A protective cover, comprising a top plate and a side plate, wherein the top plate is connected to the side plate; characterized in that: A hollow protrusion extends downward from the top plate, and a first pre-installation hole is opened on the upper surface of the top plate corresponding to the position of the hollow protrusion. The first pre-installation hole is connected to the hollow part of the hollow protrusion. The first pre-installation hole is used for the self-tapping screw to pass through so that the hollow protrusion and the self-tapping screw form the effect of an expansion screw.

10. A circuit breaker, comprising a circuit breaker housing, wherein a second pre-installation hole is provided on the circuit breaker housing; wherein: It also includes the protective cover as described in claim 9 and a self-tapping screw, the hollow protrusion is inserted into the second pre-installation hole, and the self-tapping screw is inserted into the first pre-installation hole, so that the hollow protrusion expands to form a tight fit with the hole wall of the second pre-installation hole.

Images