Miniature circuit breaker

Abstract

The utility model relates to a miniature circuit breaker, which comprises a shell, a double-cavity arc extinguishing assembly, an anode arc striking assembly, a cathode arc striking assembly, an anode release assembly and a cathode release assembly. According to the miniature circuit breaker, the two arc channels are adopted to divide the breaking main arc column into two parts, and the two arc extinguishing chambers are introduced respectively, so that the moving speed of the arc column is increased, the arc voltage is rapidly reduced, the arc cooling speed is high, the short-circuit breaking index can be effectively improved, and the miniature circuit breaker can also be suitable for short-circuit arc extinguishing of direct-current and alternating-current high-voltage systems.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a small circuit breaker. Background Art

[0002] The short-circuit breaking arc extinguishing of the existing small circuit breaker adopts two arc-starting plates and a single arc channel. At the same time, the arc-extinguishing chamber also has only one independent arc-extinguishing cavity. Moreover, due to the increase in the arc channel opening distance, the distance between the subsequent two arc-starting plates is too large, which leads to the weakening of the magnetic field energy, the slow movement speed of the arc, and even the disadvantage of arc return. Therefore, improvement is needed. Utility Model Content

[0003] In view of this, the utility model provides a small circuit breaker.

[0004] Specifically, the utility model is realized by the following technical solutions:

[0005] According to a first aspect of the utility model, a miniature circuit breaker is provided, comprising:

[0006] A housing, used for mounting various parts;

[0007] A double-cavity arc-extinguishing assembly is used to form a double-cavity arc path; the double-cavity arc-extinguishing assembly is arranged in the housing;

[0008] An anode arc-starting assembly, used for guiding an electric arc; the anode arc-starting assembly is arranged in the housing and close to the double-cavity arc-extinguishing assembly;

[0009] A cathode arc-starting assembly, used for guiding an electric arc; the cathode arc-starting assembly is disposed in the housing and is close to the double-cavity arc-extinguishing assembly;

[0010] an anode release assembly, used for releasing current; the anode release assembly is arranged in the housing and connected to the anode arc striking assembly;

[0011] The cathode release component is used for releasing current; the cathode release component is arranged in the shell and connected to the cathode arc striking component.

[0012] Optionally, the shell includes: a bottom shell and a top cover, wherein a first mounting groove, a second mounting groove, a third mounting groove, a fourth mounting groove and a fifth mounting groove are arranged in the bottom shell, wherein the dual-cavity arc extinguishing assembly is arranged in the first mounting groove, the anode arc striking assembly is arranged in the second mounting groove, the cathode arc striking assembly is arranged in the third mounting groove, the anode release assembly is arranged in the fourth mounting groove, the cathode release assembly is arranged in the fifth mounting groove, and the top cover is mounted on the bottom shell.

[0013] Optionally, the dual-cavity arc extinguishing assembly includes: a base, an arc isolation cover, an arc striking plate, an anode arc striking sheet and a cathode arc striking sheet, wherein the base is arranged in the first mounting groove, the arc isolation cover is arranged on the base, a groove body and a partition are arranged on the base, the arc striking plate is close to the partition and divides the space between the base and the arc isolation cover into an anode arc extinguishing chamber and a cathode arc extinguishing chamber, the anode arc striking sheet is arranged in the groove body of the anode arc extinguishing chamber, the cathode arc striking sheet is arranged in the groove body of the cathode arc extinguishing chamber, the anode arc striking sheet is adjacent to the anode arc extinguishing assembly, and the cathode arc striking sheet is adjacent to the cathode arc extinguishing assembly.

[0014] Optionally, the anode arc starting assembly includes: an anode arc starting plate, a connecting plate and a driving mechanism, wherein the first end of the anode arc starting plate is close to the anode arc starting plate and the second end is connected to the anode release assembly through the first end of the connecting plate, the driving mechanism is arranged in the second mounting groove and at least partially extends out of the shell, and the driving mechanism is in close contact with the second end of the connecting plate.

[0015] Optionally, the driving mechanism includes: a handle, a bracket, a connecting rod, a moving contact and a return spring, wherein the handle is rotatably disposed in the second mounting groove and is connected to the bracket through the connecting rod, the moving contact is disposed on the bracket and is close to the connecting plate, and the first end of the return spring is connected to the inner wall of the second mounting groove and the second end is connected to the bracket.

[0016] Optionally, the driving mechanism further comprises: a clamping spring, wherein a fixed end of the clamping spring is disposed in the second mounting groove and a clamping end is clamped against the bracket.

[0017] Optionally, a fixing column is provided in the second installation groove, and the handle is rotatably disposed on the fixing column.

[0018] Optionally, the cathode arc starting assembly includes: a cathode arc starting plate and a static contact, wherein the first end of the cathode arc starting plate is connected to the inner wall of the third mounting groove and the second end is close to the cathode arc starting plate, and the static contact is arranged in the third mounting groove and the first end is connected to the middle part of the cathode arc starting plate and the second end is connected to the cathode release assembly.

[0019] Optionally, the anode release assembly includes: an anode connecting screw, an anode wiring frame and an anode coil, wherein the anode connecting screw and the anode wiring frame are arranged in the fourth mounting groove and the two are connected, the anode coil is wound and arranged in the anode wiring frame, and the anode wiring frame is connected to the connecting piece.

[0020] Optionally, the cathode release assembly includes: a cathode connecting screw, a cathode wiring frame, a cathode coil, a cathode guide plate, a sleeve and a cathode guide coil, wherein the cathode connecting screw and the cathode wiring frame are arranged in the fifth mounting groove and the two are connected, the cathode coil is wound and arranged in the cathode wiring frame, the sleeve is arranged in the fifth mounting groove, the cathode guide coil is wound on the sleeve, and the first end is connected to the static contact and the second end is connected to the cathode guide plate, and the cathode guide plate is connected to the cathode wiring frame.

[0021] The technical solution provided by the utility model brings at least the following beneficial effects:

[0022] A small circuit breaker provided in the present application uses two arc paths to divide the main arc column into two, and introduces them into double arc extinguishing chambers respectively, so as to accelerate the movement speed of the arc column, quickly reduce the arc voltage, and quickly cool the arc, which can effectively improve the short-circuit breaking index and can also be used for short-circuit arc extinguishing of DC and AC high-voltage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A schematic diagram of the structure of a miniature circuit breaker provided in an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the internal structure of a miniature circuit breaker provided in an embodiment of the utility model;

[0027] Figure 3 A schematic diagram of the internal structure of a miniature circuit breaker provided in an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of the internal structure of another embodiment of a miniature circuit breaker provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Figure 1 A miniature circuit breaker applicable to an embodiment of the utility model is schematically shown.

[0031] Reference Figure 1-3 As shown, the present application provides a miniature circuit breaker, comprising:

[0032] Housing 10, used for mounting various parts;

[0033] A double-cavity arc-extinguishing assembly is used to form a double-cavity arc path; the double-cavity arc-extinguishing assembly is arranged in the housing 10;

[0034] An anode arc-starting assembly, used for guiding the electric arc; the anode arc-starting assembly is arranged in the housing 10 and is close to the double-cavity arc-extinguishing assembly;

[0035] A cathode arc-starting assembly, used for guiding the electric arc; the cathode arc-starting assembly is arranged in the housing 10 and is close to the double-cavity arc-extinguishing assembly;

[0036] an anode release assembly, used for releasing current; the anode release assembly is disposed in the housing 10 and connected to the anode arc striking assembly;

[0037] The cathode release assembly is used to release current; the cathode release assembly is arranged in the shell 10 and connected to the cathode arc striking assembly.

[0038] In the embodiment of the present application, the arc in the circuit generates two arcs through a double-cavity arc extinguishing assembly, the anode arc is discharged in turn through the anode arc starting assembly and the anode release assembly, and the cathode arc is discharged in turn through the cathode arc starting assembly and the cathode release assembly.

[0039] Exemplarily, the shell 10 includes: a bottom shell 11 and a top cover 12, wherein a first mounting groove, a second mounting groove, a third mounting groove, a fourth mounting groove and a fifth mounting groove are provided in the bottom shell 11, wherein the dual-cavity arc extinguishing assembly is provided in the first mounting groove, the anode arc striking assembly is provided in the second mounting groove, the cathode arc striking assembly is provided in the third mounting groove, the anode release assembly is provided in the fourth mounting groove, the cathode release assembly is provided in the fifth mounting groove, and the top cover 12 is mounted on the bottom shell 11.

[0040] In the embodiment of the present application, the bottom shell 11 and the top cover 12 are detachably connected by screws to form an installation space therebetween, and the dual-cavity arc extinguishing assembly, the anode arc ignition assembly, the cathode arc ignition assembly, the anode release assembly and the cathode release assembly are respectively installed in the first installation groove, the second installation groove, the third installation groove, the fourth installation groove and the fifth installation groove.

[0041] Exemplarily, the dual-cavity arc extinguishing assembly includes: a base 21, an arc isolation cover 22, an arc striking plate 23, an anode arc striking sheet 24 and a cathode arc striking sheet 25, wherein the base 21 is arranged in the first mounting groove, the arc isolation cover 22 is covered on the base 21, a groove body and a partition 26 are provided on the base 21, the arc striking plate 23 is close to the partition 26, and divides the space between the base 21 and the arc isolation cover 22 into an anode arc extinguishing chamber and a cathode arc extinguishing chamber, the anode arc striking sheet 24 is arranged in the groove body of the anode arc extinguishing chamber, the cathode arc striking sheet 25 is arranged in the groove body of the cathode arc extinguishing chamber, the anode arc striking sheet 24 is adjacent to the anode arc extinguishing assembly, and the cathode arc striking sheet 25 is adjacent to the cathode arc extinguishing assembly.

[0042] In the embodiment of the present application, the arc-isolating cover 22 is detachably mounted on the base 21 by screws, and an arc-extinguishing chamber is formed between the two. The arc-starting plate 23 is arranged close to the partition 26, thereby dividing the arc-extinguishing chamber into an anode arc-extinguishing chamber and a cathode arc-extinguishing chamber. A plurality of anode arc-starting sheets 24 are arranged in the anode arc-extinguishing chamber, and a plurality of cathode arc-starting sheets 25 are arranged in the cathode arc-extinguishing chamber. The anode arc is introduced into the anode arc-starting assembly through the anode arc-starting sheet 24, and the cathode arc is introduced into the cathode arc-starting assembly through the cathode arc-starting sheet 25.

[0043] Exemplarily, the anode arc starting assembly includes: an anode arc starting plate 31, a connecting plate 32 and a driving mechanism, wherein the first end of the anode arc starting plate 31 is close to the anode arc starting plate 24 and the second end is connected to the anode release assembly through the first end of the connecting plate 32, the driving mechanism is arranged in the second mounting groove and at least partially extends out of the shell 10, and the driving mechanism is in close contact with the second end of the connecting plate 32.

[0044] In the embodiment of the present application, the driving mechanism can drive the connecting piece 32 to make it contact with the anode arc starting plate 31. Since the connecting piece 32 is also connected to the anode release assembly, the anode arc can be introduced into the anode release assembly via the anode arc starting plate 31 and the connecting piece 32. The driving mechanism can also drive the connecting piece 32 to separate from the anode arc starting plate 31.

[0045] Exemplarily, the driving mechanism includes: a handle 33, a bracket 34, a connecting rod 35, a moving contact 36 and a reset spring 37, wherein the handle 33 is rotatably disposed in the second mounting groove and is connected to the bracket 34 through the connecting rod 35, the moving contact 36 is disposed on the bracket 34 and is close to the connecting piece 32, and the first end of the reset spring 37 is connected to the inner wall of the second mounting groove and the second end is connected to the bracket 34.

[0046] In the embodiment of the present application, when the handle 33 is toggled, the handle 33 rotates and drives the bracket 34 to rotate through the connecting rod 35, and the bracket 34 drives the moving contact 36 to rotate, thereby driving the connecting piece 32 to contact the anode arc-starting plate 31. When the handle 33 loses the external force, the reset spring 37 acts on the bracket 34 to reset it, and at this time, the bracket 34 drives the moving contact 36 to rotate, thereby driving the connecting piece 32 to separate from the anode arc-starting plate 31.

[0047] Exemplarily, the driving mechanism further includes: a pressing spring 38 , wherein a fixed end of the pressing spring 38 is disposed in the second mounting groove and a pressing end is pressed against the bracket 34 .

[0048] In the embodiment of the present application, when the handle 33 is rotated, the handle 33 rotates and drives the bracket 34 to rotate through the connecting rod 35. At this time, the bracket 34 needs to overcome the force of the clamping spring 38 to rotate into place. Otherwise, if the force is too small, it cannot rotate into place.

[0049] Exemplarily, a fixing column 39 is disposed in the second mounting groove, and the handle 33 is rotatably disposed on the fixing column 39 .

[0050] In the embodiment of the present application, the fixing column 39 provides support for the rotation of the handle 33 .

[0051] Exemplarily, the cathode arc starting assembly includes: a cathode arc starting plate 41 and a stationary contact 42, wherein the first end of the cathode arc starting plate 41 is connected to the inner wall of the third mounting groove and the second end is close to the cathode arc starting piece 25, and the stationary contact 42 is arranged in the third mounting groove and the first end is connected to the middle part of the cathode arc starting plate 41 and the second end is connected to the cathode release assembly.

[0052] In the embodiment of the present application, the cathode arc on the cathode arc starting piece 25 is introduced into the cathode release assembly via the cathode arc starting plate 41 and the static contact 42 .

[0053] Exemplarily, the anode release assembly includes: an anode connecting screw 51, an anode wiring frame 52 and an anode coil 53, wherein the anode connecting screw 51 and the anode wiring frame 52 are arranged in the fourth mounting groove and the two are connected, the anode coil 53 is wound and arranged in the anode wiring frame 52, and the anode wiring frame 52 is connected to the connecting piece 32.

[0054] In the embodiment of the present application, the anode arc is introduced into the anode coil 53 via the connecting piece 32 and then released.

[0055] Exemplarily, the cathode release assembly includes: a cathode connecting screw 61, a cathode wiring frame 62, a cathode coil 63, a cathode guide plate 64, a sleeve 65 and a cathode guide coil 66, wherein the cathode connecting screw 61 and the cathode wiring frame 62 are arranged in the fifth mounting groove and the two are connected, the cathode coil 63 is wound and arranged in the cathode wiring frame 62, the sleeve 65 is arranged in the fifth mounting groove, the cathode guide coil 66 is wound on the sleeve 65, and the first end is connected to the static contact 42 and the second end is connected to the cathode guide plate 64, and the cathode guide plate 64 is connected to the cathode wiring frame 62.

[0056] In the embodiment of the present application, the cathode arc is introduced into the cathode coil 63 via the static contact 42 and the cathode guide coil 66 and then released.

[0057] like Figure 4 A schematic diagram of another embodiment of a miniature circuit breaker provided in this application, Figure 1-3 The difference between the miniature circuit breakers shown is the specific shapes of the bottom shell 11 and the top cover 12. There is no difference in the internal structure, so it will not be described in detail.

[0058] A small circuit breaker provided in the present application uses two arc paths to divide the main arc column into two, and introduces them into double arc extinguishing chambers respectively, so as to accelerate the movement speed of the arc column, quickly reduce the arc voltage, and quickly cool the arc, which can effectively improve the short-circuit breaking index and can also be used for short-circuit arc extinguishing of DC and AC high-voltage systems.

[0059] It should be noted that, in the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0060] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0061] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0063] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A miniature circuit breaker, characterized in that: include: A housing, used for mounting various parts; A double-cavity arc extinguishing assembly is used to form a double-cavity arc path; The double-chamber arc-extinguishing assembly is arranged in the housing; An anode arc-starting assembly, used for guiding an electric arc; the anode arc-starting assembly is arranged in the housing and close to the double-cavity arc-extinguishing assembly; A cathode arc-starting assembly, used for guiding an electric arc; the cathode arc-starting assembly is disposed in the housing and is close to the double-cavity arc-extinguishing assembly; an anode release assembly, used for releasing current; the anode release assembly is arranged in the housing and connected to the anode arc striking assembly; The cathode release component is used for releasing current; the cathode release component is arranged in the shell and connected to the cathode arc striking component.

2. The miniature circuit breaker according to claim 1, characterized in that: The shell comprises: a bottom shell and a top cover, wherein a first mounting groove, a second mounting groove, a third mounting groove, a fourth mounting groove and a fifth mounting groove are arranged in the bottom shell, wherein the dual-cavity arc extinguishing assembly is arranged in the first mounting groove, the anode arc striking assembly is arranged in the second mounting groove, the cathode arc striking assembly is arranged in the third mounting groove, the anode release assembly is arranged in the fourth mounting groove, the cathode release assembly is arranged in the fifth mounting groove, and the top cover is mounted on the bottom shell.

3. The miniature circuit breaker according to claim 2, characterized in that: The double-cavity arc-extinguishing assembly includes: a base, an arc-isolating cover, an arc-striking plate, an anode arc-striking sheet and a cathode arc-striking sheet, wherein the base is arranged in the first mounting groove, the arc-isolating cover is arranged on the base, a groove body and a partition are arranged on the base, the arc-striking plate is close to the partition and divides the space between the base and the arc-isolating cover into an anode arc-extinguishing chamber and a cathode arc-extinguishing chamber, the anode arc-striking sheet is arranged in the groove body of the anode arc-extinguishing chamber, the cathode arc-striking sheet is arranged in the groove body of the cathode arc-extinguishing chamber, the anode arc-striking sheet is adjacent to the anode arc-striking assembly, and the cathode arc-striking sheet is adjacent to the cathode arc-striking assembly.

4. The miniature circuit breaker according to claim 3, characterized in that: The anode arc starting assembly includes: an anode arc starting plate, a connecting plate and a driving mechanism, wherein the first end of the anode arc starting plate is close to the anode arc starting plate and the second end is connected to the anode release assembly through the first end of the connecting plate, the driving mechanism is arranged in the second mounting groove and at least partially extends out of the shell, and the driving mechanism is in close contact with the second end of the connecting plate.

5. The miniature circuit breaker according to claim 4, characterized in that: The driving mechanism includes: a handle, a bracket, a connecting rod, a moving contact and a reset spring, wherein the handle is rotatably disposed in the second mounting groove and is connected to the bracket through the connecting rod, the moving contact is disposed on the bracket and is close to the connecting piece, and the first end of the reset spring is connected to the inner wall of the second mounting groove and the second end is connected to the bracket.

6. The miniature circuit breaker according to claim 5, characterized in that: The driving mechanism further includes: a pressing spring, wherein a fixed end of the pressing spring is arranged in the second mounting groove and a pressing end is pressed against the bracket.

7. The miniature circuit breaker according to claim 5, characterized in that: A fixing column is arranged in the second installation groove, and the handle is rotatably arranged on the fixing column.

8. The miniature circuit breaker according to claim 3, characterized in that: The cathode arc striking assembly includes: a cathode arc striking plate and a stationary contact, wherein the first end of the cathode arc striking plate is connected to the inner wall of the third mounting groove and the second end is close to the cathode arc striking piece, and the stationary contact is arranged in the third mounting groove and the first end is connected to the middle part of the cathode arc striking plate and the second end is connected to the cathode release assembly.

9. The miniature circuit breaker according to claim 4, characterized in that: The anode release assembly includes: an anode connecting screw, an anode wiring frame and an anode coil, wherein the anode connecting screw and the anode wiring frame are arranged in the fourth mounting groove and the two are connected, the anode coil is wound and arranged in the anode wiring frame, and the anode wiring frame is connected to the connecting piece.

10. The miniature circuit breaker according to claim 8, characterized in that: The cathode release assembly includes: a cathode connecting screw, a cathode wiring frame, a cathode coil, a cathode guide plate, a sleeve and a cathode guide coil, wherein the cathode connecting screw and the cathode wiring frame are arranged in the fifth mounting groove and the two are connected, the cathode coil is wound and arranged in the cathode wiring frame, the sleeve is arranged in the fifth mounting groove, the cathode guide coil is wound on the sleeve, and the first end is connected to the static contact and the second end is connected to the cathode guide plate, and the cathode guide plate is connected to the cathode wiring frame.

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