Miniature circuit breaker

Abstract

The utility model discloses a miniature circuit breaker which is characterized in that a first limiting structure, a second limiting structure and a third limiting structure are arranged on a base and an upper cover; the first limiting structure and the second limiting structure are arranged on the two sides of the center line of the framework respectively, the first limiting structure limits the part, exceeding the framework, of the static iron core, and the second limiting structure limits the framework. The third limiting structure is arranged above the first limiting structure and the second limiting structure, and the magnet yoke is limited among the third limiting structure, the first limiting structure and the second limiting structure; the magnetic yoke mounting structure has the characteristic that the magnetic yoke can be freely selected to be mounted or not mounted.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a small circuit breaker. Background Art

[0002] For small circuit breakers, they have protection functions such as instantaneous tripping and overload tripping.

[0003] The electromagnetic tripping system is mainly used to achieve instantaneous tripping in small circuit breakers. The existing electromagnetic tripping system includes a yoke, a coil, a frame, a moving iron core, a static iron core, a reset spring and a push rod. The electromagnetic tripping system here uses the principle of electromagnets, that is, when a short circuit occurs in the circuit, the coil is energized to make the yoke and the static iron core generate magnetic attraction to the moving iron core, and finally the push rod moves to achieve instantaneous tripping protection.

[0004] In the existing electromagnetic tripping system, the frame is often fixed on the yoke to form a whole, and then the yoke is limited by the housing of the circuit breaker. For example, an electromagnetic system disclosed in CN220021020U and a small circuit breaker having the same adopt this structure. The electromagnetic system with this structure is easy to assemble.

[0005] However, as user requirements increase, sometimes small circuit breakers with different electromagnetic tripping parameters are needed, such as changing the electromagnetic tripping parameters by removing the yoke. Once the yoke is removed, the above structure will make the entire electromagnetic system unable to be assembled, because the structure of the shell is adapted to the yoke, and after the yoke is removed, there is a lack of limit for the remaining components of the electromagnetic system, so it cannot be assembled. Therefore, in order to adapt to different electromagnetic tripping parameters, the existing structure must set different circuit breaker shells to adapt to the different structures of the electromagnetic system.

[0006] Therefore, how to make the housing structure of a circuit breaker have the option of installing a yoke or not installing a yoke is a direction worthy of research. Summary of the invention

[0007] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a small circuit breaker on which a yoke can be installed or not installed according to the actual needs of the user.

[0008] The present application provides: a small circuit breaker, which includes a base, an upper cover and an electromagnetic system, wherein the electromagnetic system is installed in a space formed by the upper cover and the base; the electromagnetic system includes a coil, a frame, a moving iron core, a static iron core, a push rod and a reset spring; the moving iron core, the static iron core, the push rod and the reset spring are in the frame, a part of the static iron core is arranged beyond the frame, and a through hole is opened on the static iron core so that the moving iron core can drive the push rod to pass through the through hole after the movement of the moving iron core; wherein a first limiting structure, a second limiting structure and a third limiting structure are arranged on the base and the upper cover; the first limiting structure and the second limiting structure are arranged on both sides of the center line of the frame, the first limiting structure limits the part of the static iron core that exceeds the frame, and the second limiting structure limits the frame; the third limiting structure is arranged above the first limiting structure and the second limiting structure, and the yoke is limited between the third limiting structure and the first limiting structure and the second limiting structure.

[0009] Compared with the prior art, the present application adopts the above structure, and directly uses the first limiting structure and the second limiting structure on the base and the upper cover to limit the skeleton and the static iron core (the prior art limits the yoke), so even if the yoke is not installed, the skeleton installation is still stable. At the same time, the third limiting structure is used to limit the yoke, and the stability of the yoke can be guaranteed even if the yoke is installed. Therefore, users can choose to install a yoke or not install a small circuit breaker according to actual needs.

[0010] The first limiting structure includes a first boss arranged on the base and a first protrusion arranged on the upper cover, and the first boss and the first protrusion are both in contact with the portion of the static iron core that protrudes beyond the frame.

[0011] With this structure, the first limiting structure formed by the first boss and the first protrusion can limit the position of the skeleton by limiting the position of the static iron core, thereby effectively ensuring the position of one end of the skeleton.

[0012] The portion of the static iron core that protrudes beyond the frame is in an arc shape, the diameter of the protruding portion is smaller than the diameter of the frame, and the first boss and the second boss are both provided with an arc surface that matches the protruding portion.

[0013] This arc-shaped design not only adapts to the shape of the static iron core, but also facilitates assembly.

[0014] The second limiting structure includes a second boss arranged on the base and a second protrusion arranged on the upper cover, the second boss abuts against an end of the frame away from the static iron core, the second protrusion abuts against the frame, and there is a gap between the second boss and the second protrusion in the length direction of the frame.

[0015] With this structure, the second limiting structure formed by the second boss and the second protrusion can limit the frame, thereby effectively ensuring the stability of the frame installation.

[0016] The yoke includes a first longitudinal portion, a second longitudinal portion and a first transverse portion. The direction of the first transverse portion is parallel to the length direction of the frame. The first longitudinal portion and the second longitudinal portion are respectively connected to the two ends of the first transverse portion. The first longitudinal portion, the second longitudinal portion and the first transverse portion are all vertically arranged. Part of the first longitudinal portion extends into the gap, and the end of the second longitudinal portion away from the first transverse portion is arranged adjacent to the first boss and the first protrusion.

[0017] By adopting this structure, the stability of the yoke installation can be effectively guaranteed.

[0018] A notch is formed on a surface of the first longitudinal portion facing the base, and the second boss extends into the notch to abut against the frame.

[0019] By adopting this structure, the stability of the yoke installation and the compactness of the overall structure can be effectively guaranteed.

[0020] Among them, the third limiting structure includes a third boss arranged on the base and a third protrusion arranged on the upper cover, the third boss abuts on the surface of the first horizontal part away from the first and second longitudinal parts; the third protrusion abuts on two adjacent surfaces of the first horizontal part, and one of the two adjacent surfaces is the surface of the first horizontal part away from the first and second longitudinal parts.

[0021] This structure can effectively ensure that the yoke is limited and prevent the yoke from shaking in the product height direction.

[0022] The third limiting structure includes a fourth boss arranged on the base, and the fourth boss is located on a surface of the first longitudinal portion away from the first transverse portion.

[0023] This structure can effectively ensure that the yoke is limited and prevent the yoke from shaking in the length direction of the product.

[0024] The second protrusion includes a first sub-portion and a second sub-portion. There is a height difference between the first sub-portion and the second sub-portion. The first sub-portion is used to abut against the frame, and the second sub-portion is used to abut against the first longitudinal portion.

[0025] This structure can effectively ensure that the yoke is limited in position, and can also ensure that the frame is limited in position.

[0026] Wherein, a sinking area is arranged on the base, and the yoke part is located in the sinking area.

[0027] By adopting this structure, the overall structure can be made more compact, so that the width dimension of the product can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 An exploded view of a circuit breaker according to an embodiment of the present application is shown;

[0030] Figure 2 A schematic diagram of the structure of a base in a circuit breaker in an embodiment of the present application is shown;

[0031] Figure 3 A schematic diagram of the structure of the upper cover in the circuit breaker in the embodiment of the present application is shown;

[0032] Figure 4 A schematic diagram showing the structure of the remaining components of the electromagnetic system of a circuit breaker except for the yoke in an embodiment of the present application is shown;

[0033] Figure 5 A schematic diagram showing the structure of a magnetic yoke in a circuit breaker according to an embodiment of the present application is shown;

[0034] Figure 6 A schematic diagram showing the cooperation between the base and the electromagnetic system (without the yoke) in the circuit breaker of the embodiment of the present application is shown;

[0035] Figure 7 A schematic diagram showing the cooperation between the upper cover and the electromagnetic system (without the yoke) in the circuit breaker of the embodiment of the present application is shown;

[0036] Figure 8 A schematic diagram showing the cooperation between the upper cover and the magnetic yoke in the circuit breaker of the embodiment of the present application is shown;

[0037] Fig. 9 A schematic diagram showing the cooperation between the base and the yoke in the circuit breaker of the embodiment of the present application is shown;

[0038] Fig.10 A schematic diagram showing a partial cross-section of the circuit breaker upper cover is shown. DETAILED DESCRIPTION

[0039] The embodiments of the present application 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 application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, 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 application and simplifying the description, and do not indicate or imply that the referred device or element 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 application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0044] like Figure 1-Figure 10 As shown, the embodiment of the present application is a small circuit breaker, which is also called an air switch, and includes an instantaneous tripping function (also called a short-circuit protection function) and an overload protection function.

[0045] The circuit breaker can be a single-pole circuit breaker or a multi-pole circuit breaker, and the internal structure of the multi-pole circuit breaker is basically the same as that of the single-pole circuit breaker. Taking this embodiment as an example, a single-pole circuit breaker includes a housing, an operating mechanism 20, an electromagnetic system, a thermal tripping system 40, an arc extinguishing system 50, a contact system 30, and two sets of terminal blocks 60.

[0046] The housing includes a base 11 and an upper cover 12. The base 11 and the upper cover 12 are fastened by riveting. Of course, in addition to riveting, snap-fit ​​connection, screw fastening, etc. can also be used. Moreover, it can be fastened by a single fastening method or by a combination of snap-fit ​​connection and riveting. Through the above fastening method, the base 11 and the upper cover 12 can be stably connected, so that the internal space is stable, which is conducive to the installation of the operating mechanism 20, the electromagnetic system, the thermal trip system 40, the arc extinguishing system 50, the contact system 30 and the two sets of terminal blocks 60.

[0047] The operating mechanism 20 is a conventional four-bar linkage mechanism, and the contact system 30 can be connected and disconnected through the operating mechanism 20 .

[0048] The contact system 30 includes a moving contact and a stationary contact. The moving contact can be connected or disconnected with the stationary contact under the action of the operating mechanism 20.

[0049] The thermal tripping system 40 is a bimetallic strip, which is bent to cause the operating mechanism 20 to trip when the line is overloaded. This tripping method is common knowledge in the art and will not be described in detail here.

[0050] The arc extinguishing system 50 includes an arc extinguishing cover, an arc striking plate and other structures, and its function is to extinguish the arc generated when the contact system 30 is disconnected.

[0051] The two groups of connection terminals 60 respectively include a first connection terminal and a second connection terminal, which are used to be connected in the circuit. For example, the first connection terminal is connected to the load, and the second connection terminal is connected to the power supply.

[0052] The electromagnetic system includes a yoke 71, a coil 72, a frame 73, a moving iron core, a static iron core 75, a push rod 76 and a reset spring. The moving iron core, the static iron core 75, the push rod 76 and the reset spring are located inside the frame 73. The static iron core 75 partially extends beyond the frame 73 and is exposed from the right end of the frame 73. A through hole 74 is provided on the static iron core 75, and a part of the push rod 76 is arranged inside the through hole 74. The working principle of the electromagnetic system is that when a short circuit occurs in the line, a large amount of current passes through the coil 72, causing the yoke 71 and the static iron core 75 to be magnetized, attracting the moving iron core to move, thereby driving the push rod 76 to extend out of the static iron core 75 to push the operating mechanism 20, thereby realizing the opening operation.

[0053] In order to enable the user to choose to install the yoke 71 or not, in this embodiment, the electromagnetic system is fixed in the following manner:

[0054] The first limiting structure, the second limiting structure and the third limiting structure are arranged on the base 11 and the upper cover 12. The first limiting structure and the second limiting structure are arranged on both sides of the center line of the skeleton 73, the first limiting structure limits the part of the static iron core 75 that exceeds the skeleton 73, and the second limiting structure limits the skeleton 73, and the first limiting structure and the second limiting structure are arranged on both sides of the center line of the skeleton 73 in the length direction.

[0055] In this embodiment, the first limiting structure includes a first boss 111 and a first protrusion 121. The first boss 111 is arranged on the base 11, and the first protrusion 121 is arranged on the upper cover 12. The positions of the first boss 111 and the first protrusion 121 are basically the same, and the two are jointly in contact with the portion of the static iron core 75 that exceeds the skeleton 73. Specifically, the portion of the static iron core 75 that exceeds the skeleton 73 is in an arc shape, and the diameter of the arc shape is smaller than the diameter of the skeleton 73. The first boss 111 and the first boss 111 are both provided with an arc surface that matches the arc shape, so that the arc surface just wraps the portion of the static iron core 75 that exceeds the skeleton 73. At the same time, the side of the first boss 111 and the side of the first protrusion 121 can also be in contact with the skeleton 73 to achieve a certain limiting effect.

[0056] In this embodiment, the second limiting structure includes a second boss 112 and a second protrusion 122. The second boss 112 is disposed on the base 11, and the second protrusion 122 is disposed on the upper cover 12. There is a gap between the second boss 112 and the second protrusion 122 in the length direction of the skeleton 73. The second boss 112 abuts against the left end of the skeleton 73, that is, against the end of the skeleton 73 away from the static iron core 75, while the second protrusion 122 abuts against the skeleton 73. Therefore, the second boss 112 is further to the left than the second protrusion 122, so there is a gap between the second boss 112 and the second protrusion 122 in the length direction of the skeleton 73.

[0057] Therefore, by directly limiting the skeleton 73 and the static iron core 75 through the first limiting structure and the second limiting structure, it is possible to ensure a stable connection between these components and the base 11 and the upper cover 12 without fixing these components through the yoke 71. Therefore, the electromagnetic system can be fixed even if the yoke 71 is not installed.

[0058] The yoke 71 is fixed in the following manner:

[0059] The yoke 71 includes a first longitudinal portion 711, a second longitudinal portion 712 and a first transverse portion 713. The direction of the first transverse portion 713 is parallel to the length direction of the frame 73. The first longitudinal portion 711 and the second longitudinal portion 712 are respectively connected to the two ends of the first transverse portion 713. The first longitudinal portion 711, the second longitudinal portion 712 and the first transverse portion 713 are all arranged vertically. In this embodiment, the first longitudinal portion 711 is longer than the second longitudinal portion 712. A portion of the first longitudinal portion 711 is arranged in the interval between the second boss 112 and the second protrusion 122. The second longitudinal portion 712 is located above the first boss 111 and the first protrusion 121 (adjacently arranged), so the first transverse portion 713 is horizontally mounted above the frame 73. A notch 714 is provided on the surface of the first longitudinal portion 711 facing the base 11, and an arc edge adapted to the frame 73 is provided on the second boss 112. The second boss 112 is extended into the notch 714 and abuts against the frame 73 using the arc edge.

[0060] The third limiting structure is generally located above the first limiting structure and the second limiting structure, where the above is viewed from the height direction of the circuit breaker. In this embodiment, the third limiting structure includes a third boss 113 and a third protrusion 123, where the third boss 113 is arranged on the base 11, and the third protrusion 123 is arranged on the upper cover 12. The third boss 113 abuts against the upper surface of the first transverse portion 713, or it can be said that it abuts against the surface of the first transverse portion 713 away from the first and second longitudinal portions 712. The third protrusion 123 is roughly L-shaped, abutting against the upper surface and adjacent side surfaces of the first transverse portion 713. Simply put, the third protrusion 123 abuts against two adjacent surfaces of the first transverse portion 713. In this way, the yoke 71 can be limited in the height direction of the circuit breaker. In order to limit the yoke 71 in the length direction of the circuit breaker, the third limiting structure also includes a fourth boss 114, which is arranged on the base 11 and is located on a side surface of the first longitudinal portion 711, which is the surface of the first longitudinal portion 711 away from the first transverse portion 713. In order to ensure that the yoke 71 is fixed more stably, the second protrusion 122 here includes a first sub-portion 122a and a second sub-portion 122b, and there is a height difference between the first sub-portion 122a and the second sub-portion 122b. The first sub-portion 122a is used to abut against the frame 73, that is, the second protrusion 122 uses the sub-portion to abut against the frame 73. The second sub-portion 122b is used to abut against the first longitudinal portion 711. At the same time, a sinking area 115 is provided on the base 11, and the third protrusion 123, the third boss 113, and the fourth boss 114 are all arranged around the sinking area 115. After the yoke 71 is arranged, part of it is located in the sinking area 115, so that the overall structure can be more compact and the width dimension of the product can be guaranteed.

[0061] 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 present application. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A miniature circuit breaker, comprising a base, an upper cover and an electromagnetic system, wherein the electromagnetic system is installed in a space formed by the upper cover and the base; the electromagnetic system comprises a yoke, a coil, a frame, a moving iron core, a stationary iron core, a push rod and a reset spring; the moving iron core, the stationary iron core, the push rod and the reset spring are arranged in the frame, a part of the stationary iron core is arranged beyond the frame, and a through hole is opened on the stationary iron core so that the moving iron core can drive the push rod to pass through the through hole after the movement; the characteristics are: The base and the upper cover are provided with a first limiting structure, a second limiting structure and a third limiting structure; the first limiting structure and the second limiting structure are respectively arranged on both sides of the center line of the skeleton, the first limiting structure limits the part of the static iron core that exceeds the skeleton, and the second limiting structure limits the skeleton; the third limiting structure is arranged above the first limiting structure and the second limiting structure, and the yoke is limited between the third limiting structure and the first limiting structure and the second limiting structure.

2. A miniature circuit breaker according to claim 1, characterized in that: The first limiting structure includes a first boss arranged on the base and a first protrusion arranged on the upper cover, and the first boss and the first protrusion are both in contact with a portion of the static iron core that protrudes beyond the frame.

3. A miniature circuit breaker according to claim 2, characterized in that: The portion of the static iron core that protrudes beyond the frame is in an arc shape, the diameter of the protruding portion is smaller than the diameter of the frame, and the first boss and the upper first boss are both provided with an arc surface that matches the protruding portion.

4. A miniature circuit breaker according to claim 2, characterized in that: The second limiting structure includes a second boss arranged on the base and a second protrusion arranged on the upper cover, the second boss abuts against an end of the frame away from the static iron core, the second protrusion abuts against the frame, and there is a gap between the second boss and the second protrusion in the length direction of the frame.

5. A miniature circuit breaker according to claim 4, characterized in that: The yoke includes a first longitudinal portion, a second longitudinal portion and a first transverse portion. The direction of the first transverse portion is parallel to the length direction of the frame. The first longitudinal portion and the second longitudinal portion are respectively connected to the two ends of the first transverse portion. The first longitudinal portion, the second longitudinal portion and the first transverse portion are all vertically arranged. Part of the first longitudinal portion extends into the gap, and the end of the second longitudinal portion away from the first transverse portion is arranged adjacent to the first boss and the first protrusion.

6. A miniature circuit breaker according to claim 5, characterized in that: A notch is formed on a surface of the first longitudinal portion facing the base, and the second boss extends into the notch to abut against the frame.

7. A miniature circuit breaker according to claim 5, characterized in that: The third limiting structure includes a third boss arranged on the base and a third protrusion arranged on the upper cover, the third boss abuts against the surface of the first transverse portion away from the first and second longitudinal portions; the third protrusion abuts against two adjacent surfaces of the first transverse portion, and one of the two adjacent surfaces is the surface of the first transverse portion away from the first and second longitudinal portions.

8. A miniature circuit breaker according to claim 5, characterized in that: The third limiting structure includes a fourth boss disposed on the base, and the fourth boss is located on a surface of the first longitudinal portion away from the first transverse portion.

9. A miniature circuit breaker according to claim 5, characterized in that: The second protrusion includes a first sub-portion and a second sub-portion. There is a height difference between the first sub-portion and the second sub-portion. The first sub-portion is used to abut against the frame, and the second sub-portion is used to abut against the first longitudinal portion.

10. A miniature circuit breaker according to claim 5, characterized in that: The base is provided with a sinking area, and the yoke part is located in the sinking area.

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