Locking structure of miniature circuit breaker

Abstract

The utility model discloses a locking structure of a miniature circuit breaker, a first surface and a second surface of a shell are respectively provided with a first sinking part and a second sinking part, each part of the first sinking part is lower than the first surface, and each part of the second sinking part is lower than the second surface; the first limiting hole is located at the lowest position of the first sinking part, the first sinking part is provided with a first guide face surrounding the periphery of the first limiting hole, the first guide face is an inclined face or an arc face, and the first guide face gradually rises from the end close to the first limiting hole to the end away from the first limiting hole; the second limiting hole is located at the lowest position of the second sinking part, the second sinking part is provided with a second guide face surrounding the periphery of the second limiting hole, the second guide face is an inclined face or an arc face, and the second guide face gradually rises from the end close to the second limiting hole to the end away from the second limiting hole; the circuit breaker locking device has the advantage that a user can lock the circuit breaker conveniently.

Description

TECHNICAL FIELD

[0001] The application relates to a small circuit breaker, in particular to a locking structure of a small circuit breaker. BACKGROUND

[0002] The small circuit breaker generally has a handle locking function, that is, when the handle is in a closed state or an open state, the handle is locked through a pin to prevent user misoperation.

[0003] A handle limiting device of a circuit breaker disclosed in CN205452207U has a reserved hole on a shell and a limiting slot on a handle. When locking is needed, a pin is sequentially inserted from the reserved hole on one side of the shell, passes through the limiting slot and is then inserted from the reserved hole on the other side. In this way, the handle can be limited by the pin to prevent user misoperation.

[0004] However, the diameter of the existing pin is basically 1.2 mm, and the size of the corresponding reserved hole is basically 1.2 mm. The small hole is extremely inconvenient for users to insert the pin. Therefore, how to make the user more convenient to lock the handle has become an urgent problem to be solved. SUMMARY

[0005] Therefore, the application aims to overcome the deficiencies in the prior art and provides a small circuit breaker.

[0006] The application provides a locking structure of a small circuit breaker, which comprises a shell, a handle and a locking pin, the handle is rotationally arranged on the shell; a first limiting hole is formed in a first surface of the shell, a second limiting hole is formed in a second surface of the shell, the first limiting hole and the second limiting hole correspond to each other to allow the locking pin to pass through, and the locking pin blocks the movement track of the handle after passing through; wherein the first surface and the second surface of the shell are respectively provided with a first sunken part and a second sunken part, the first sunken part is lower than the first surface at each position, and the second sunken part is lower than the second surface at each position; the first limiting hole is located at the lowest position of the first sunken part, the first sunken part is provided with a first guide surface surrounding the first limiting hole, the first guide surface is a slope or an arc surface, and the first guide surface gradually rises from one end close to the first limiting hole to the other end away from the first limiting hole; the second limiting hole is located at the lowest position of the second sunken part, the second sunken part is provided with a second guide surface surrounding the second limiting hole, the second guide surface is a slope or an arc surface, and the second guide surface gradually rises from one end close to the second limiting hole to the other end away from the second limiting hole.

[0007] In some embodiments of the present application, the first limiting hole has a positive projection area on the first surface, and the second limiting hole has a positive projection area on the second surface, both of which are S1; the first sunken part has a positive projection area on the first surface, which is not less than 2S1, and the second sunken part has a positive projection area on the second surface, which is not less than 2S1.

[0008] In some embodiments of the present application, the outer edge of the first guide surface has a positive projection shape on the first surface, which is one or a combination of a circle, a triangle, a rectangle, a square or an ellipse; the outer edge of the second guide surface has a positive projection shape on the second surface, which is one or a combination of a circle, a triangle, a rectangle, a square or an ellipse.

[0009] In some embodiments of the present application, the first sunken part has a first imaginary center point, which is located in the first limiting hole; the second sunken part has a second imaginary center point, which is located in the second limiting hole.

[0010] In some embodiments of the present application, the first sunken part has a first imaginary center point, the second sunken part has a second imaginary center point, and the handle has a rotation center; in the height direction of the miniature circuit breaker, the first imaginary center point is between the first limiting hole and the rotation center, and the second imaginary center point is between the second limiting hole and the rotation center; in the height direction of the miniature circuit breaker, the part of the first sunken part below the first limiting hole is more than the part of the first sunken part at the edge of the first limiting hole, and the part of the second sunken part below the second limiting hole is more than the part of the second sunken part at the periphery of the second limiting hole.

[0011] In some embodiments of the present application, the handle is provided with a first locking groove and a second locking groove, the first locking groove corresponds to the handle in the open position, and the second locking groove corresponds to the handle in the closed position; a locking pin is arranged in the first limiting hole, the first locking groove and the second limiting hole to achieve locking in the open position; the locking pin is arranged in the first limiting hole, the second locking groove and the second limiting hole to achieve locking in the closed position.

[0012] In some embodiments of the present application, the first limiting hole and the second limiting hole are coaxially arranged; when in the open position locking, the locking pin is at least in interference fit with the first locking groove; when in the closed position locking, the locking pin is at least in interference fit with the second locking groove.

[0013] In some embodiments of the present application, the locking pin has a first rod portion, a bent portion and a second rod portion, the first rod portion and the second rod portion are connected by the bent portion; the first rod portion is used for being inserted into the first limiting hole, the second rod portion is used for being inserted into the second limiting hole, the bent portion is in the first locking groove or the second locking groove to form the interference fit; the first rod portion and the second rod portion are both straight, the distance between the center line of the first rod portion and the center line of the second rod portion is D, 0mm<D<0.1mm.

[0014] In some embodiments of the present application, the distance from the first surface to the second surface is 18mm, the first rod portion and the second rod portion are both not less than 8mm.

[0015] In some embodiments of the present application, the miniature circuit breaker is a reclosing circuit breaker or a leakage circuit breaker or an air switch.

[0016] The beneficial effects of the present application compared with the prior art are:

[0017] By adopting the design of the first sinking portion, the first guide surface is formed, when locking is needed, the user can roughly push the locking pin against the first guide surface, and then move the locking pin along the guide surface into the first limiting hole to complete the locking of the handle (here, the locking can also be completed through the second guide surface and the second limiting hole, which will not be described here), compared with the prior art which needs the user to directly align the locking pin with the first limiting hole, such a structure undoubtedly makes the implementation of the locking structure more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation to the scope, for those skilled in the art, without paying creative labor, other related drawings can also be obtained according to these drawings.

[0019] Figure 1 A perspective view of the miniature circuit breaker of the embodiment of the present application is shown;

[0020] Figure 2 A partial cross-sectional view of the miniature circuit breaker of the embodiment of the present application is shown;

[0021] Figure 3 A schematic view of the handle in the embodiment of the present application is shown;

[0022] Figure 4 A side view of the miniature circuit breaker of the embodiment of the present application is shown;

[0023] Figure 5 Another side view of the miniature circuit breaker of the embodiment of the present application is shown;

[0024] Figure 6 Fig. 1 shows a schematic view of an embodiment of a first sinking part of a miniature circuit breaker according to the present application;

[0025] Figure 7 Fig. 2 shows a schematic view of another embodiment of a first sinking part of a miniature circuit breaker according to the present application;

[0026] Figure 8 Fig. 3 shows a schematic view of yet another embodiment of a first sinking part of a miniature circuit breaker according to the present application;

[0027] Figure 9 Fig. 4 shows a schematic view of a miniature circuit breaker according to the present application during installation of a locking pin;

[0028] Figure 10 Fig. 5 shows a schematic view of a locking pin of a miniature circuit breaker according to the present application. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals are used throughout the figures to refer to the same or like elements or elements having the same or similar function. The embodiments described below are merely exemplary for the purposes of explanation and are not intended to limit the application, which is limited only by the claims.

[0030] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms “first”, “second”, etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first”, “second”, etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “plurality” is two or more, unless otherwise specifically limited.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0034] like Figures 1-10 As shown, an embodiment of this application is a miniature circuit breaker, also known as an air switch. It includes a locking structure comprising a handle 100, a locking pin 200, and a housing 300. Other components are housed within the housing 300.

[0035] Other components include moving and stationary contacts, operating mechanism (handle 100 is part of the operating mechanism), arc-extinguishing chamber, terminal block, electromagnetic trip unit, bimetallic strip, etc. Since this application only relates to improvements to the locking structure of handle 100, other components will not be described in detail.

[0036] The outer casing 300 includes a first casing 301 and a second casing 302, which are spliced ​​together and then fastened by rivets.

[0037] The first surface 301a is on the first shell 301, and the second surface 302a is on the second shell 302, and the first surface 301a and the second surface 302a are opposite surfaces. The handle 100 is rotatably arranged between the first shell 301 and the second shell 302. In this embodiment, a first insertion column 303 is arranged on the first shell 301, and a first insertion slot 304 is formed on the second shell 302. The first insertion column 303 is inserted into the first insertion slot 304 through the handle 100, and the handle 100 is rotatably arranged around the first insertion column 303. In this embodiment, a rivet is arranged in the center of the first insertion column 303, and the center of the rivet is the rotation center O of the handle 100.

[0038] The handle 100 has two positions, one is the closed position, and the other is the open position. The first locking slot 101 and the second locking slot 102 are arranged on the handle 100. The first locking slot 101 corresponds to the open position, and the second locking slot 102 corresponds to the closed position.

[0039] The first limiting hole 3010 is arranged on the first surface 301a of the first shell 301, and the second limiting hole 3020 is arranged on the second shell 302. The first limiting hole 3010 and the second limiting hole 3020 correspond to each other.

[0040] When the handle 100 is rotated to the closed position, the first limiting hole 3010, the second limiting hole 3020, and the second locking slot 102 are communicated. When locking is needed, the locking pin 200 is inserted into one of the first limiting hole 3010 and the second limiting hole 3020, and the other end of the locking pin 200 is inserted into the other limiting hole through the second locking slot 102, so that the closed locking is realized.

[0041] Conversely, when the open locking is needed, the handle 100 is rotated to the open position, and the first limiting hole 3010, the second limiting hole 3020, and the first locking slot 101 are communicated. The locking pin 200 is inserted into one of the first limiting hole 3010 and the second limiting hole 3020, and the other end of the locking pin 200 is inserted into the other limiting hole through the first locking slot 101, so that the open locking is realized.

[0042] Whether it is closed locking or open locking, the essence is that the locking pin 200 blocks the movement track of the handle 100, so that the handle 100 cannot move again.

[0043] The first surface 301a of the first shell 301 is provided with a first sunken part 3011, the first sunken part 3011 is lower than the first surface 301a, the first limiting hole 3010 is located at the lowest position of the first sunken part 3011, and the first sunken part 3011 has a first guide surface 3012 surrounding the periphery of the first limiting hole 3010. The first guide surface 3012 is a slope, the closer to the first limiting hole 3010, the lower, and the farther away from the first limiting hole 3010, the higher, that is, the first guide surface 3012 gradually rises from one end close to the first limiting hole 3010 to the other end away from the first limiting hole 3010; in simple terms, the size of the first guide surface 3012 from the hole wall of the first limiting hole 3010 to the first surface 301a gradually increases. Of course, the first guide surface 3012 here can also be an arc surface.

[0044] The second surface 302a of the second shell 302 is provided with a second sunken part 3021, the second sunken part 3021 is lower than the second surface 302a, the second limiting hole 3020 is located at the lowest position of the second sunken part 3021, and the second sunken part 3021 has a second guide surface 3022 surrounding the periphery of the second limiting hole 3020. The second guide surface 3022 is a slope, the closer to the second limiting hole 3020, the lower, and the farther away from the second limiting hole 3020, the higher, that is, the second guide surface 3022 gradually rises from two ends close to the second limiting hole 3020 to two ends away from the second limiting hole 3020; in simple terms, the size of the second guide surface 3022 from the hole wall of the second limiting hole 3020 to the second surface 302a gradually increases. Of course, the second guide surface 3022 here can also be an arc surface.

[0045] No matter the design of the first guide surface 3012 or the second guide surface 3022, the user can resist one end of the locking pin 200 on the first guide surface 3012 or the second guide surface 3022 when installing the locking pin 200, and then complete the installation, so that the mechanism makes the locking pin 200 more easily penetrate into the limiting hole, improves the convenience of installing the locking structure.

[0046] In general, the first limiting hole 3010 has a projection area S1 on the first surface 301a (which is actually the cross-sectional area of the first limiting hole 3010), and the second limiting hole 3020 also has a projection area S1 on the second surface 302a (which is actually the cross-sectional area of the second limiting hole 3020). The first sunken part 3011 has a projection area not less than 2S1 on the first surface 301a, and the second sunken part 3021 has a projection area not less than 2S1 on the second surface 302a. Such area guarantees that it is easier and more convenient for the user to put one end of the locking pin 200 against the first guide surface 3012 or the second guide surface 3022.

[0047] For the first guide surface 3012 and the second guide surface 3022, its overall shape can be circular as shown in Figures 4-5 , or elliptical as shown in Figure 6 , or square as shown in Figure 7 , or triangular as shown in Figure 8 . In addition, it can also be rectangular, or a combination of the above-mentioned shapes. Here, the overall shape can also be understood as the outer projection shape of the first guide surface 3012 on the first surface 301a, and the outer projection shape of the second guide surface 3022 on the second surface 302a.

[0048] For the first sunken part 3011 and the second sunken part 3021, they respectively have a first imaginary center point O1 and a second imaginary center point O2 as shown in Figure 4 . Here, the first imaginary center point O1 and the second imaginary center point O2 are in the first limiting hole 3010 and the second limiting hole 3020, and can also be said to coincide with the center O3 of the first limiting hole 3010 and the second limiting hole 3020.

[0049] Of course, a non-coincidence mode can also be adopted. For example, Figure 6As shown, in the height direction of the miniature circuit breaker, the first imaginary center point O1 (the second imaginary center point O2) is between the center O3 of the first limiting hole 3010 (the second limiting hole 3020) and the rotation center O. In this way, more part of the first sunken part 3011 (the second sunken part 3021) is below the first limiting hole 3010 (the second limiting hole 3020), which can be said that more part of the first sunken part 3011 (the second sunken part 3021) below the first limiting hole 3010 (the second limiting hole 3020) is more than the part of the first sunken part 3011 (the second sunken part 3021) at the edge of the first limiting hole 3010 (the second limiting hole 3020). In this way of not coinciding, the upper edge of the shell is closer to the first limiting hole 3010 (the second limiting hole 3020), which concentrates more of the first sunken part 3011 (the second sunken part 3021) below the first limiting hole 3010 (the second limiting hole 3020), which will be beneficial to the processing of the shell and ensure the strength of the shell.

[0050] The above-mentioned locking pin 200 can adopt a completely straight rod structure, that is, the locking pin 200 and the first limiting hole 3010, the second limiting hole 3020, the first locking groove 101 and the second locking groove 102 adopt a clearance fit way. Of course, it can also adopt an interference fit way.

[0051] As shown, Figure 10 The locking pin 200 has a first rod part 201, a bending part 202 and a second rod part 203, and the first rod part 201 and the second rod part 203 are connected through the bending part 202. Here, the first rod part 201 and the second rod part 203 are straight, and due to the bending part 202, there is a slight gap between the axis of the first rod part 201 and the axis of the second rod part 203, and the gap is D, 0mm<D<0.1mm. In this way, combined with the coaxial arrangement of the first limiting hole 3010 and the second limiting hole 3020, when the locking pin 200 is inserted into the lock (assuming it is a closing lock), the bending part 202 is in the first locking groove 101 to form an interference fit. Of course, assuming it is a split lock, the bending part 202 is in the second locking groove 102 to form an interference fit. Here, of course, not only the bending part 202 and the first locking groove 101, the second locking groove 102 have an interference fit, but also the first rod part 201, the second rod part 203 will also form an interference fit with the first limiting hole 3010, the second limiting hole 3020.

[0052] This interference fit will make the locking structure more stable.

[0053] For the circuit breaker, its width dimension is 18mm, that is, the distance between the first surface 301a and the second surface 302a is 18mm, and here the first rod portion 201 and the second rod portion 203 are both not less than 8mm, which ensures that the bending portion is in the center position of the locking pin 200.

[0054] Of course, in addition to the above-mentioned application in the air switch, this locking mode can also be applied in the circuit breaker of the reclosing type or the leakage circuit breaker, and so on, as long as the circuit breaker has the handle 100 and the housing 300.

[0055] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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 appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0056] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A locking structure of a miniature circuit breaker, comprising a housing, a handle and a locking pin, the handle being rotatably arranged with the housing; a first limiting hole is formed on a first surface of the housing, and a second limiting hole is formed on a second surface of the housing, the first limiting hole and the second limiting hole corresponding to each other for the locking pin to pass through, and the locking pin blocks a movement track of the handle after passing through; characterized in that: The first surface and the second surface of the shell are respectively provided with a first sunken part and a second sunken part, the first sunken part is lower than the first surface, and the second sunken part is lower than the second surface; the first limiting hole is located at the lowest position of the first sunken part, the first sunken part is provided with a first guide surface surrounding the first limiting hole, the first guide surface is an inclined surface or an arc surface, and the first guide surface gradually rises from one end close to the first limiting hole to one end away from the first limiting hole; the second limiting hole is located at the lowest position of the second sunken part, the second sunken part is provided with a second guide surface surrounding the second limiting hole, the second guide surface is an inclined surface or an arc surface, and the second guide surface gradually rises from one end close to the second limiting hole to one end away from the second limiting hole.

2. The locking structure of a miniature circuit breaker according to claim 1, characterized in that: The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot. The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot.

3. The locking structure of a miniature circuit breaker according to claim 1, characterized in that: The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot.

4. The locking structure of a miniature circuit breaker according to claim 1, characterized in that: The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot.

5. The locking structure of a miniature circuit breaker according to claim 1, characterized in that: The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot.

6. The locking structure of a miniature circuit breaker according to claim 1, characterized in that: The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot. The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot.

7. The locking structure of a miniature circuit breaker according to claim 6, characterized in that: The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot. The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot. The first limiting hole is coaxial with the second limiting hole; when being locked in the open position, the locking pin is in interference fit with at least the first locking slot; when being locked in the closed position, the locking pin is in interference fit with at least the second locking slot.

8. The locking structure of a miniature circuit breaker according to claim 7, characterized in that: The locking pin has a first rod part, a bending part and a second rod part, the first rod part and the second rod part are connected through the bending part; the first rod part is used for being inserted in the first limiting hole, the second rod part is used for being inserted in the second limiting hole, the bending part is in the first locking slot or the second locking slot to form the interference fit; the first rod part and the second rod part are both straight, the distance between the axial center line of the first rod part and the axial center line of the second rod part is D, 0mm<D<0.1mm.

9. The locking structure of a miniature circuit breaker according to claim 8, characterized in that: The distance from the first surface to the second surface is 18mm, the first rod part and the second rod part are both not less than 8mm.

10. The locking structure of a miniature circuit breaker according to any one of claims 1 to 9, characterized in that: The small circuit breaker is a reclosing circuit breaker or a leakage circuit breaker or an air switch.

Images