A reclosing small circuit breaker

Abstract

The present invention discloses a reclosing small circuit breaker, including a circuit breaker body, an over-voltage and under-voltage protection circuit, an external fastening structure, a fixed shaft, a fastening arm, a fastening interval area and a state-maintaining substructure. The present invention has the following advantages and effects: the assembly structure of the circuit breaker is improved; the two external fastening structures on the circuit breaker can be fastened to the corresponding positioning plug-in to fix the circuit breaker body; the setting of the state-maintaining subcomponent can keep the two fastening arms in a loose state for a long time, providing operation time for the subsequent disassembly of the circuit breaker body; at the same time, the present invention integrates and centrally controls the entire structure, and only requires one external power source to realize multiple output controls, which has the advantage of simple operation.

Description

Technical Field

[0001] The invention relates to the field of fixing circuit breakers, and in particular to a small reclosing circuit breaker. Background Art

[0002] A circuit breaker is an electrical device that automatically cuts off a circuit to prevent overload, short circuit and other fault conditions from causing damage to electrical equipment or starting a fire. Its main function is to monitor changes in current and quickly open the circuit when an abnormal condition is detected, thereby protecting the safety of electrical systems and personnel.

[0003] The traditional assembly method of circuit breakers is screw installation. This assembly method has some obvious limitations, which are mainly reflected in the following aspects:

[0004] 1. The installation process is cumbersome

[0005] Specifically, the series of operations of tightening and loosening the screws are time-consuming and troublesome; at the same time, the texture of the screw head has the risk of wear.

[0006] 2. Poor spatial adaptability

[0007] Specifically, in some small or hard-to-reach spaces, traditional screw installation methods are extremely inconvenient; users may find it difficult to rotate the tool, resulting in poor installation results.

[0008] 3. Not conducive to fast and frequent replacement of circuit breakers

[0009] Specifically, when a circuit breaker needs to be replaced, the user needs to spend a lot of time unscrewing the screws. Especially when dealing with multiple devices, the workload increases significantly and the efficiency is low.

[0010] In short, the traditional way of installing circuit breakers by screws has obvious defects in installation, maintenance, and space adaptability. With the increasing complexity of electrical systems and users' demand for convenient and efficient solutions, these disadvantages are particularly prominent. Therefore, it is necessary to improve the assembly method of circuit breakers. Summary of the invention

[0011] The object of the present invention is to provide a reclosing miniature circuit breaker to solve the problems raised in the background technology.

[0012] The above technical objectives of the present invention are achieved through the following technical solutions:

[0013] A reclosing miniature circuit breaker comprises a circuit breaker body, wherein an over-voltage and under-voltage protection circuit is arranged in the circuit breaker body;

[0014] The upper and lower ends of the circuit breaker body are fixedly provided with external fastening structures, and the two external fastening structures are respectively located on two opposite sides of the vertical center axis of the circuit breaker body; and also include two fixed shafts fixed on the mounting surface; the two external fastening structures can be docked with the two fixed shafts respectively, so that the two external fastening structures can be fastened to the corresponding positioning plug-in, thereby fixing the circuit breaker body;

[0015] Each of the external fastening structures comprises two fastening arms, and a fastening spacing area for the fixed shaft to penetrate is formed between the two fastening arms;

[0016] The two fastening arms have a tendency to maintain fastening in the original state;

[0017] The two fastening arms have a tendency to loosen under the power of an external power source;

[0018] Each of the external fastening structures includes two state maintaining substructures respectively connected to the two fastening arms. When the two fastening arms are in a loosened state under the power of an external power source, the two state maintaining substructures will respectively lock the corresponding fastening arms under the power of the same external power source, so that the two fastening arms remain in a loosened state, which facilitates the disassembly of the circuit breaker body.

[0019] It is further arranged that: the two fastening arms maintain a fastening tendency under the tension of the first tension spring;

[0020] The power of the external power source is a gaseous medium, and the two fastening arms have a tendency to loosen after being filled with the gaseous medium; the two state holding substructures are gas-controlled structures, and can respectively lock the two fastening arms in a loosened state after being filled with the gaseous medium.

[0021] It is further arranged that: each of the external fastening structures comprises a filling port for filling the gaseous medium from the outside to the inside;

[0022] Each of the external fastening structures further includes a front receiving sub-component disposed inside the structure; the front receiving sub-component can receive the gaseous medium filled into the filling port and generate a driving force to drive the two fastening arms to loosen; the gaseous medium in the filling port can also be diverted to the two state maintaining sub-structures.

[0023] Further configuration is: each of the external fastening structures includes an external shell, and a front end cover is provided at the front end of the external shell; the two fastening arms are located in the external shell, and are symmetrically arranged on both sides of the vertical center axis of the external shell, and inner expansion blocks are fixedly arranged on the inner sides of the two fastening arms, and the two ends of the first tension spring are respectively fixed on the two inner expansion blocks;

[0024] Each of the state maintaining substructures includes two built-in seats respectively fixed in the external shell, and the two fastening arms are provided with built-in grooves. The two built-in seats can at least remain partially located in the corresponding built-in grooves and can be in contact with the inner walls of the corresponding built-in grooves to limit the two fastening arms to only move horizontally.

[0025] The further configuration is: it also includes a driving shaft, the driving shaft is vertically arranged, the driving shaft is inserted between two fastening arms, both sides of the driving shaft are fixedly provided with driving wings with a right-angled triangle cross-section, and the two fastening arms are provided with smooth inclined surfaces that can be attached to the hypotenuse of the driving wing;

[0026] A fixing block is fixedly arranged in the external housing, and a first through hole is provided in the fixing block for the driving shaft to pass through;

[0027] The driving force generated by the front end receiving sub-component can push the driving shaft to move upwards. As the driving shaft moves upwards, the two active wings can push the fastening arms apart respectively, so that the two fastening arms are loosened.

[0028] The further configuration is as follows: a fixing seat is fixedly provided at the bottom of the fixing block, and the front end receiving sub-component includes an inner cavity opened inside the fixing seat; the driving shaft extends into the inner cavity and is fixedly provided with an extension section, an inner sealing plate is fixedly provided on the inner side of the inner cavity, and an outer sealing plate is fixedly provided on the outer side, and a second through hole for the driving shaft to extend into is formed between the outer sealing plate and the inner cavity wall; the outer sealing plate is located on the outer side of the extension section, and a spring is provided between the two, and the spring can always drive the extension section to move inward; the inner sealing plate is located on the inner side of the extension section, and the two can offset each other for limiting, and the inner sealing plate and the extension section are provided with square depressions on one side facing each other, and the two square depressions cooperate to form a receiving area;

[0029] A first female inner channel connecting the receiving area and the filling port is provided in the fixing seat.

[0030] Further configuration is: the first stacking block and the second stacking block are sequentially arranged on one side of the vertical center axis of the built-in seat facing the external shell, and a locking piece for fixing the three together is arranged on the transverse center axis of the first stacking block, the second stacking block and the built-in seat; the first stacking block and the second stacking block cooperate to form two inner partition grooves, the two inner partition grooves are separated on both sides of the locking piece, and outer top shafts are slidably arranged in the two inner partition grooves, and outer sides of the two outer top shafts are fixedly arranged with outer top blocks; the two outer top shafts can at least remain partially limited in the corresponding inner partition grooves to limit the two outer top blocks to only be able to move vertically;

[0031] The inner and outer sides of the two built-in grooves are both provided with side concave surfaces; the two outer top blocks can respectively push into the side concave surfaces to lock the two fastening arms; the inner sides of the two outer top blocks are fixedly provided with second tension springs, the inner sides of the second tension springs are respectively fixed on the first stacking block and the second stacking block, and the second tension springs can always drive the corresponding outer top blocks to move inward.

[0032] Further configuration is: a cushion block is fixedly arranged on the inner side of the two outer top shafts, the cross-sectional width of the cushion block is smaller than the outer top shaft, a spacing space is formed when the cushion block abuts against the inner wall of the second stack block, and a first sub-inner channel connected to the corresponding spacing space is opened in the first stack block;

[0033] A second sub-inner channel is provided inside the built-in seat, and the second sub-inner channel is communicated with the two first sub-inner channels respectively.

[0034] Further configuration is: a second female inner channel communicating with the filling port is opened in the fixing seat;

[0035] An intermediate connecting channel is provided in the fixing block, and the intermediate connecting channel has three connecting ports, one of which is connected to the second female inner channel, and the remaining two connecting ports are connected to the two second sub-inner channels respectively through rubber hoses.

[0036] A further configuration is that a micro-control valve capable of controlling the connection or sealing of the filling port is fixedly arranged on the filling port.

[0037] The present invention has the following beneficial effects:

[0038] 1. The assembly structure of the circuit breaker is improved in the present invention; the two fixed shafts can be fixed on any installation surface as a fixing carrier, and the two external fastening structures on the circuit breaker can be fastened to the corresponding positioning plug-in to fix the circuit breaker body; the two external fastening structures are respectively located on the opposite sides of the vertical center axis of the circuit breaker body, which can improve the stability of the circuit breaker after fixation. The two fastening arms will keep the fixed shafts fastened in the original state, and the external power source can loosen the two fastening arms through the power generated, which provides convenience for the subsequent disassembly of the circuit breaker body; the setting of the state holding sub-component can keep the two fastening arms in a loosened state for a long time, which provides operation time for the subsequent disassembly of the circuit breaker body. At the same time, the present invention integrates and centrally controls the entire structure, and only requires one external power source to realize multiple output controls, which has the advantage of simple operation.

[0039] 2. In the present invention, the first tension spring provides the two fastening arms with a fastening force in the original state; the external power source adopts a gaseous medium, which has the advantage of fast response, is suitable for the rapid disassembly of multiple devices, and is convenient for frequent replacement of circuit breakers; at the same time, the gaseous medium has the advantage of low cost.

[0040] 3. In the present invention, the front receiving sub-component can receive the gaseous medium filled from the filling port, thereby driving the two fastening arms to loosen; the gaseous medium in the filling port will also be diverted to the two state maintaining sub-structures.

[0041] 4. In the present invention, the two inner expansion blocks in the external shell are used for fixing the first tension spring; the built-in seat in the state-maintaining substructure can limit the two fastening arms to only move horizontally, thereby preventing the fastening arms from shifting in the longitudinal position.

[0042] 5. In the present invention, the driving shaft is used to fix the two active wings. The two active wings can contact with the two fastening arms during the vertical movement of the driving shaft, so that the two fastening arms have a tendency to approach or separate from each other; the setting of the first through hole in the fixing block allows the driving shaft to move only vertically, preventing the driving shaft from shifting in the lateral position.

[0043] 6. In the present invention, the second through-hole is set to allow the driving shaft to extend into the inner cavity; the spring is set to always drive the extension section to move inward, so that the two active wings will not hinder the fastening action of the two fastening arms approaching each other; the inner sealing plate and the square depression on the extension section can cooperate to form a receiving area, and the existence of the receiving area can receive the gaseous medium and then provide a driving force for the driving shaft to move upward.

[0044] 7. In the present invention, the locking member can fix the first stacking block, the second stacking block and the built-in seat; the two outer top blocks can simultaneously lock the inner walls on both sides of the fastening arm, thereby improving the locking stability of the fastening arm; the outer top shaft can be partially limited to the corresponding inner partition groove so that the outer top block can only move vertically; the setting of the second tension spring can drive the corresponding outer top block to move inward, thereby preventing the outer top block from hindering the lateral movement of the fastening arm.

[0045] 8. The provision of the spacer in the present invention ensures that the separation space always exists to receive the gaseous medium; the second sub-inner channel can simultaneously fill the two first sub-inner channels with the gaseous medium.

[0046] 9. The setting of the intermediate connecting channel in the present invention can realize the interconnection between the second mother inner channel and the two second sub-inner channels.

[0047] 10. The provision of the micro-control valve in the present invention can prevent leakage of the gaseous medium, thereby keeping the two fastening arms in a loosened state. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1It is a schematic diagram of the mechanism of the embodiment;

[0049] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0050] Figure 3 for Figure 2 Enlarged view of middle part B;

[0051] Figure 4 Schematic diagram of the external structure of the external fastening structure in the embodiment.

[0052] In the figure: 11, circuit breaker body; 21, fastening arm; 22, fastening spacer; 23, inner expansion block; 24, first tension spring; 25, built-in groove; 251, side concave surface; 30, filling port; 301, micro-control valve; 31, first female inner channel; 32, second female inner channel; 41, external housing; 42, front end cover; 51, active shaft; 52, active wing; 53, smooth inclined surface; 54, fixing block; 541, first through hole; 61, fixing seat; 62, inner cavity; 63. Extension section; 631. Extension auxiliary block; 64. Inner sealing plate; 65. Outer sealing plate; 651. Second perforation; 66. Spring; 67. Receiving area; 70. Built-in seat; 71. First stack of blocks; 72. Second stack of blocks; 73. Locking piece; 74. Inner partition groove; 75. Outer top shaft; 76. Outer top block; 77. Second tension spring; 78. Cushion block; 80. Spacing space; 81. First sub-inner channel; 82. Second sub-inner channel; 91. Middle connecting channel; 92. Rubber hose. DETAILED DESCRIPTION

[0053] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0054] As attached Figures 1 to 4 As shown;

[0055] The present embodiment discloses a reclosing miniature circuit breaker, including a circuit breaker body 11, wherein an overvoltage and undervoltage protection circuit is arranged in the circuit breaker body 11; the overvoltage and undervoltage protection circuit in the circuit breaker body 11 is a conventional setting.

[0056] The upper and lower ends of the circuit breaker body 11 are fixedly provided with external fastening structures, and the two external fastening structures are respectively located on two opposite sides of the vertical center axis of the circuit breaker body 11; and also include two fixed shafts fixed on the mounting surface; the two external fastening structures can be docked with the two fixed shafts respectively, so that the two external fastening structures can be fastened to the corresponding positioning plug-in, thereby fixing the circuit breaker body 11;

[0057] It should be added that expansion screws can be used to fix the shaft.

[0058] It should be added that the mounting surface may be the interior of a cabinet or a wall.

[0059] Each external fastening structure includes two fastening arms 21, and a fastening spacer 22 for the fixing shaft to penetrate is formed between the two fastening arms 21;

[0060] It should be supplemented that the inner sides of the two fastening arms 21 may be provided with arc-shaped openings adapted to the expansion screws.

[0061] The two fastening arms 21 tend to maintain fastening in the original state;

[0062] The two fastening arms 21 have a tendency to loosen under the power of the external power source;

[0063] Each external fastening structure includes two state maintaining substructures respectively connected to the two fastening arms 21. When the two fastening arms 21 are in a loosened state under the power of an external power source, the two state maintaining substructures will respectively lock the corresponding fastening arms 21 under the power of the same external power source, so that the two fastening arms 21 remain in a loosened state, which facilitates the disassembly of the circuit breaker body 11.

[0064] Among them, the two fastening arms 21 tend to be fastened under the tension of the first tension spring 24;

[0065] The power of the external power source is a gaseous medium, and the two fastening arms 21 tend to loosen after being filled with the gaseous medium; the two state holding substructures are gas-controlled structures, and can respectively lock the two fastening arms 21 in the loosened state after being filled with the gaseous medium.

[0066] Each external fastening structure includes a filling port 30 for filling the gaseous medium from the outside to the inside;

[0067] Each external fastening structure also includes a front receiving sub-component disposed inside the structure; the front receiving sub-component can receive the gaseous medium filled into the filling port 30 and generate a driving force to drive the two fastening arms 21 to loosen; the gaseous medium in the filling port 30 can also be diverted to the two state maintaining sub-structures.

[0068] Each external fastening structure includes an external shell 41, and a front cover 42 is provided at the front end of the external shell 41; two fastening arms 21 are located in the external shell 41, and are symmetrically arranged on both sides of the vertical center axis of the external shell 41, and inner expansion blocks 23 are fixedly arranged on the inner sides of the two fastening arms 21, and the two ends of the first tension spring 24 are respectively fixed on the two inner expansion blocks 23;

[0069] Each state maintaining substructure includes two built-in seats 70 respectively fixed in the external shell 41, and the two fastening arms 21 are provided with built-in grooves 25. The two built-in seats 70 can at least remain partially located in the corresponding built-in grooves 25 and can be in contact with the inner walls of the corresponding built-in grooves 25 to limit the two fastening arms 21 to only move horizontally.

[0070] The invention also includes a driving shaft 51, which is vertically arranged and inserted between two fastening arms 21. Active wings 52 with a right-angled triangle cross section are fixedly arranged on both sides of the driving shaft 51. Both fastening arms 21 are provided with smooth inclined surfaces 53 that can be attached to the hypotenuse of the active wings 52.

[0071] A fixing block 54 is fixedly disposed in the external housing 41, and a first through hole 541 is formed in the fixing block 54 for the driving shaft 51 to pass through.

[0072] The driving force generated by the front receiving sub-component can push the driving shaft 51 to move upward. As the driving shaft 51 moves upward, the two active wings 52 can push the fastening arms 21 apart respectively, so that the two fastening arms 21 are loosened.

[0073] Among them, a fixing seat 61 is fixedly provided at the bottom of the fixing block 54, and the front end receiving sub-component includes an inner cavity 62 opened inside the fixing seat 61; the driving shaft 51 extends into the inner cavity 62 and is fixedly provided with an extension section 63, an inner sealing plate 64 is fixedly provided on the inner side of the inner cavity 62, and an outer sealing plate 65 is fixedly provided on the outer side, and a second through hole 651 for the driving shaft 51 to extend into is formed between the outer sealing plate 65 and the wall of the inner cavity 62; the outer sealing plate 65 is located on the outer side of the extension section 63, and a spring 66 is provided between the two, and the spring 66 can always drive the extension section 63 to move inward; the inner sealing plate 64 is located on the inner side of the extension section 63, and the two can offset each other for limiting, and the inner sealing plate 64 and the extension section 63 are both provided with square depressions on one side facing each other, and the two square depressions cooperate to form a receiving area 67;

[0074] A first female inner channel 31 communicating with the receiving area 67 and the filling port 30 is defined in the fixing seat 61 .

[0075] It should be added that an extension auxiliary block 631 is fixedly provided on the extension section 63, and the extension auxiliary block 631 can abut against the outer sealing plate 65 to prevent the spring 66 from being damaged due to excessive pressure.

[0076] Among them, the first stacking block 71 and the second stacking block 72 are sequentially arranged on one side of the vertical center axis of the built-in seat 70 facing the external shell 41, and a locking piece 73 for fixing the three together is arranged on the transverse center axis of the first stacking block 71, the second stacking block 72 and the built-in seat 70; the first stacking block 71 and the second stacking block 72 cooperate to form two inner partition grooves 74, and the two inner partition grooves 74 are separated on both sides of the locking piece 73, and outer top shafts 75 are slidably arranged in the two inner partition grooves 74, and outer side of the two outer top shafts 75 are fixedly arranged with outer top blocks 76; the two outer top shafts 75 can at least remain partially limited in the corresponding inner partition grooves 74, so as to limit the two outer top blocks 76 to only move vertically;

[0077] It should be added that the locking member 73 is a bolt; screw holes adapted to the locking member 73 are formed in the first stacking block 71 , the second stacking block 72 and the built-in seat 70 .

[0078] The inner and outer sides of the two built-in grooves 25 are both provided with side concave surfaces 251; the two outer top blocks 76 can respectively push into the side concave surfaces 251 to lock the two fastening arms 21; the inner sides of the two outer top blocks 76 are fixedly provided with second tension springs 77, and the inner sides of the second tension springs 77 are respectively fixed on the first stacking block 71 and the second stacking block 72, and the second tension springs 77 can always drive the corresponding outer top blocks 76 to move inward.

[0079] Among them, the inner sides of the two outer top shafts 75 are fixedly provided with cushion blocks 78, the cross-sectional width of the cushion blocks 78 is smaller than the outer top shaft 75, and a spacing space 80 is formed when the cushion blocks 78 abut against the inner wall of the second stack block 72, and a first sub-inner channel 81 communicating with the corresponding spacing space 80 is opened in the first stack block 71;

[0080] A second sub-inner channel 82 is defined inside the built-in seat 70 , and the second sub-inner channel 82 is communicated with the two first sub-inner channels 81 , respectively.

[0081] Among them, a second female inner channel 32 communicating with the filling port 30 is opened in the fixing seat 61;

[0082] An intermediate connecting passage 91 is provided in the fixing block 54 . The intermediate connecting passage 91 has three connecting ports, one of which is connected to the second female inner channel 32 , and the remaining two connecting ports are connected to the two second sub-inner channels 82 through rubber hoses 92 .

[0083] The filling port 30 is fixedly provided with a micro-control valve 301 which can control the connection or sealing of the filling port 30 .

[0084] The working principle of this embodiment is:

[0085] In the original state:

[0086] 1. The two fastening arms 21 tend to be fastened under the tension of the first tension spring 24;

[0087] 2. The extension section 63 can move inwards under the action of the spring 66 and abut against the inner sealing plate 64 to limit the position.

[0088] 3. The two second tension springs 77 can respectively drive the two outer top blocks 76 to move inward, thereby preventing the two outer top blocks 76 from hindering the lateral movement of the corresponding fastening arms 21 .

[0089] When assembling the circuit breaker body 11:

[0090] 1. Fix two fixed shafts (expansion screws) on the installation surface (inner wall of the cabinet or wall). The two fixed shafts must be aligned with the positions of the two external fastening structures respectively;

[0091] 2. A gaseous medium (air) is generated by an external air pump. The gaseous medium can be filled into the filling port 30 and filled into the receiving area 67 through the first female inner channel 31. As the gaseous medium is continuously filled, the extension section 63 moves upward, thereby driving the active shaft 51 and the two active wings 52 to move upward. The two active wings 52 can push the fastening arms 21 along the smooth inclined surface 53 respectively, so that the two fastening arms 21 are loosened.

[0092] 3. The gaseous medium in the filling port 30 will also be respectively filled into the two second sub-inner channels 82 through the second mother inner channel 32, the middle connecting channel 91, and the two rubber hoses 92; the gaseous medium filled into the two second sub-inner channels 82 will then enter the spacing space 80 through the first sub-inner channel 81; and then push the two outer top shafts 75 to move outward, and the two outer top blocks 76 will move outward accordingly.

[0093] 4. When the built-in seat 70 abuts against the bottom of the built-in groove 25, the two outer push blocks 76 can move outwards and push into the two side concave surfaces 251 respectively to lock the two fastening arms 21, so that the two fastening arms 21 remain in a loosened state.

[0094] 5. Close the micro-control valve 301 to prevent the gaseous medium filled into the circuit breaker body 11 from leaking; the two fastening arms 21 remain in a loosened state.

[0095] 6. Connect the two external fastening structures to the two fixed shafts respectively.

[0096] 7. After docking, open the micro-control valve 301, and the two second tension springs 77 can respectively drive the two outer top blocks 76 to move inward, and at the same time push the gaseous medium in the two interval spaces 80 out of the filling port 30; the extension section 63 can move inward under the action of the spring 66, and at the same time push the gaseous medium in the receiving area 67 out of the filling port 30; the two fastening arms 21 will move inward under the pull of the first tension spring 24 and fasten the corresponding fixed shaft.

[0097] After such arrangement, the installation and removal of the circuit breaker body 11 can be performed only by filling the gaseous medium, which has the advantages of simple operation, adaptability to narrow or inaccessible spaces, and convenience for rapid and frequent replacement of the circuit breaker body 11 .

[0098] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A reclosing miniature circuit breaker, comprising a circuit breaker body (11), wherein the circuit breaker body (11) is provided with an overvoltage and undervoltage protection circuit; characterized in that: The upper and lower ends of the circuit breaker body (11) are both fixedly provided with external fastening structures, and the two external fastening structures are respectively located on two opposite sides of the vertical center axis of the circuit breaker body (11); and also include two fixed shafts fixed on the mounting surface; the two external fastening structures can be respectively docked with the two fixed shafts, so that the two external fastening structures can be respectively fastened to the corresponding positioning plug-in, thereby fixing the circuit breaker body (11); Each of the external fastening structures comprises two fastening arms (21), and a fastening spacing area (22) for the fixed shaft to penetrate is formed between the two fastening arms (21); The two fastening arms (21) maintain a fastening tendency in the original state; The two fastening arms (21) have a tendency to loosen under the power of an external power source; Each of the external fastening structures comprises two state-maintaining substructures respectively connected to the two fastening arms (21); when the two fastening arms (21) are in a loosened state under the action of power from an external power source, the two state-maintaining substructures respectively lock the corresponding fastening arms (21) under the action of power from the same external power source, so that the two fastening arms (21) remain in a loosened state, thereby facilitating the disassembly of the circuit breaker body (11); The two fastening arms (21) maintain a fastening tendency under the tension of the first tension spring (24); The power of the external power source is a gaseous medium, and the two fastening arms (21) have a tendency to loosen after being filled with the gaseous medium; the two state-maintaining substructures are gas-controlled structures, and can respectively lock the two fastening arms (21) in a loosened state after being filled with the gaseous medium; Each of the external fastening structures comprises a filling port (30) for filling the gaseous medium from the outside to the inside; Each of the external fastening structures further comprises a front end receiving sub-component arranged inside the structure; the front end receiving sub-component can receive the gaseous medium filled into the filling port (30) and simultaneously generate a driving force for driving the two fastening arms (21) to loosen; the gaseous medium in the filling port (30) can also be diverted to the two state maintaining sub-structures.

2. A reclosing miniature circuit breaker according to claim 1, characterized in that: Each of the external fastening structures comprises an external shell (41), and a front end cover (42) is provided at the front end of the external shell (41); the two fastening arms (21) are both located inside the external shell (41) and are symmetrically arranged on both sides of the vertical center axis of the external shell (41); an inner expansion block (23) is fixedly arranged on the inner side of the two fastening arms (21), and the two ends of the first tension spring (24) are respectively fixed on the two inner expansion blocks (23); Each of the state-maintaining substructures comprises two built-in seats (70) respectively fixed in the external shell (41); the two fastening arms (21) are each provided with a built-in groove (25); the two built-in seats (70) can at least be kept partially located in the corresponding built-in groove (25) and can be in contact with the inner wall of the corresponding built-in groove (25) to limit the two fastening arms (21) to only be able to move horizontally.

3. A reclosing miniature circuit breaker according to claim 2, characterized in that: It also includes a driving shaft (51), the driving shaft (51) is vertically arranged, the driving shaft (51) is inserted between two fastening arms (21), and active wings (52) with a right-angled triangle cross-section are fixedly arranged on both sides of the driving shaft (51), and the two fastening arms (21) are each provided with a smooth inclined surface (53) that can be attached to the hypotenuse of the active wing (52); A fixing block (54) is fixedly arranged in the external housing (41), and a first through hole (541) is provided in the fixing block (54) for the driving shaft (51) to pass through; The driving force generated by the front end receiving sub-component can push the driving shaft (51) to move upward, and as the driving shaft (51) moves upward, the two active wings (52) can respectively push the fastening arms (21) apart, so that the two fastening arms (21) are loosened.

4. A reclosing miniature circuit breaker according to claim 3, characterized in that: The fixing block (54) is fixedly provided with a fixing seat (61) at the bottom, and the front end receiving sub-component includes an inner cavity (62) opened inside the fixing seat (61); the driving shaft (51) extends into the inner cavity (62) and is fixedly provided with an extension section (63); an inner sealing plate (64) is fixedly provided on the inner side of the inner cavity (62), and an outer sealing plate (65) is fixedly provided on the outer side; a space for the driving shaft (51) to extend into is formed between the outer sealing plate (65) and the wall of the inner cavity (62). a second through hole (651); the outer sealing plate (65) is located on the outer side of the extension section (63), and a spring (66) is provided between the two, and the spring (66) can always drive the extension section (63) to move inward; the inner sealing plate (64) is located on the inner side of the extension section (63), and the two can abut against each other for limiting position, and the inner sealing plate (64) and the extension section (63) are provided with square recesses on one side facing each other, and the two square recesses cooperate to form a receiving area (67); The fixing seat (61) is provided with a first female inner channel (31) communicating with the receiving area (67) and the filling port (30).

5. A reclosing miniature circuit breaker according to claim 4, characterized in that: The first stacking block (71) and the second stacking block (72) are sequentially arranged on one side of the vertical center axis of the built-in seat (70) facing the external shell (41); a locking piece (73) for fixing the three together is arranged on the transverse center axis of the first stacking block (71), the second stacking block (72) and the built-in seat (70); the first stacking block (71) and the second stacking block (72) cooperate to form two inner partition grooves (74); the two inner partition grooves (74) are separated on both sides of the locking piece (73); an outer top shaft (75) is slidably arranged in the two inner partition grooves (74); an outer top block (76) is fixedly arranged on the outer side of the two outer top shafts (75); the two outer top shafts (75) can at least remain partially limited in the corresponding inner partition grooves (74) to limit the two outer top blocks (76) to only move vertically; The inner and outer sides of the two built-in grooves (25) are both provided with side concave surfaces (251); the two outer top blocks (76) can respectively push into the side concave surfaces (251) to lock the two fastening arms (21); the inner sides of the two outer top blocks (76) are both fixedly provided with second tension springs (77), the inner sides of the second tension springs (77) are respectively fixed on the first stacking block (71) and the second stacking block (72), and the second tension springs (77) can always drive the corresponding outer top blocks (76) to move inwards.

6. A reclosing miniature circuit breaker according to claim 5, characterized in that: A cushion block (78) is fixedly arranged on the inner side of the two outer top shafts (75), the cross-sectional width of the cushion block (78) is smaller than that of the outer top shaft (75), and a spacing space (80) is formed when the cushion block (78) abuts against the inner wall of the second stacking block (72), and a first sub-inner channel (81) communicating with the corresponding spacing space (80) is opened in the first stacking block (71); A second sub-inner channel (82) is provided inside the built-in seat (70), and the second sub-inner channel (82) is communicated with the two first sub-inner channels (81) respectively.

7. A reclosing miniature circuit breaker according to claim 6, characterized in that: The fixing seat (61) is provided with a second female inner channel (32) communicating with the filling port (30); An intermediate connecting channel (91) is provided in the fixing block (54), and the intermediate connecting channel (91) has three connecting ports, one of which is connected to the second female inner channel (32), and the remaining two connecting ports are connected to the two second sub-inner channels (82) respectively through rubber hoses (92).

8. A reclosing miniature circuit breaker according to claim 4, characterized in that: The filling port (30) is fixedly provided with a micro-control valve (301) capable of controlling the connection or sealing of the filling port (30).

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