Quick closing mechanism and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses a quick-closing mechanism and a circuit breaker, and the quick-closing mechanism comprises a handle and a quick-closing part. The handle is driven to drive the moving contact assembly to be switched off or switched on. The moving contact assembly comprises a rotary base, a moving contact rod and a first elastic piece; the first end of the quick closing piece extends towards the moving contact rod, and the second end of the quick closing piece extends towards the handle; in the closing action, the moving contact rod abuts against the first end of the quick closing piece and stops moving, and the rotating base is driven by the handle to rotate and extrudes the first elastic piece to complete energy storage. The shell is provided with a guide structure matched with the quick closing piece, under the guidance of the guide structure, the handle can be connected with the second end and drive the quick closing piece to move in the direction away from the moving contact rod, the first end relieves the abutting of the moving contact rod, and the moving contact rod is pushed by the first elastic piece to be closed. The quick closing mechanism is improved, so that the error of the opening distance of the moving contact can be reduced, and the control precision of the moving contact is improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a quick-closing mechanism and a circuit breaker. Background Art

[0002] In order to achieve fast closing, reduce the transition time of the switch when connecting the circuit, and improve the reliability of power supply, it is necessary to set a fast closing mechanism in the circuit breaker. Usually, the fast closing mechanism uses a handle, a connecting rod and other structures to drive the moving contact assembly and the static contact to achieve fast closing operation. In order to release the elastic energy stored in the closing of the moving contact, a trigger release mechanism is usually set. In the closed state, the trigger release mechanism releases the lock of the moving contact, releases the elastic potential energy, and achieves fast closing.

[0003] In the prior art, the overall action dimension chain of the trigger release mechanism is relatively long, resulting in a large opening distance error of the moving contact, which makes it impossible to achieve precise control of the moving contact. Utility Model Content

[0004] The purpose of the present application is to provide a quick closing mechanism and a circuit breaker, wherein the improvement of the quick closing mechanism can reduce the error of the opening distance of the moving contacts and improve the control accuracy of the moving contacts.

[0005] The embodiment of the present application is implemented as follows:

[0006] On the one hand, an embodiment of the present application provides a quick-closing mechanism, which is arranged in linkage with a moving contact assembly of a circuit breaker, and the quick-closing mechanism includes a handle and a quick-closing part; the handle has a rotation center connected to the housing of the circuit breaker, and the handle can be driven to drive the moving contact assembly to open or close the circuit; the moving contact assembly includes a rotating base, a moving contact rod and a first elastic part; the first end of the quick-closing part extends toward the moving contact rod, and the second end extends toward the handle; during the closing action, the moving contact rod abuts against the first end of the quick-closing part to stop moving, and the first elastic part can store energy; a guide structure cooperating with the quick-closing part is provided on the housing, the handle can be connected to the second end and drive the quick-closing part to move in a direction away from the moving contact rod under the guidance of the guide structure, the first end releases the abutment on the moving contact rod, and the moving contact rod is pushed to close by the first elastic part.

[0007] As an optional embodiment, a second elastic member is provided on the shell, and a hanging portion connected to the second elastic member is provided on the quick-connect member. The quick-connect member has a retaining surface on the side away from the hanging portion, and a blocking portion is provided in the shell. The thrust provided by the second elastic member can make the retaining surface of the quick-connect member abut against the blocking portion; the hanging portion is located on one side or both sides of the extension direction of the quick-connect member.

[0008] As an optional embodiment, the guide structure includes a support column arranged close to the moving contact rod; a stop portion is arranged at the first end; the stop portion is provided with a first abutment surface on the side away from the moving contact rod, and the support column has a first supporting surface; when the circuit is closed and energy is stored, the first supporting surface abuts against the first abutment surface, so that the stop portion forms a force to prevent the moving contact rod from closing.

[0009] As an optional embodiment, the first abutment surface is located on one side of the stop portion, and the other side surface corresponding to the stop portion can abut against the moving contact rod; the end of the stop portion has a second abutment surface, and the support column has a second supporting surface on the side close to the stop portion, and a guide portion is formed at the connection between the first supporting surface and the second supporting surface; when the quick-closing part moves away from the moving contact rod, the stop portion and the guide portion slide, so that the first supporting surface is separated from the first abutment surface, and the second supporting surface is overlapped with the second abutment surface.

[0010] As an optional embodiment, the guide structure includes an arc-shaped guide plate, the inner arc surface of the arc-shaped guide plate is close to the handle, and an arc-shaped guide groove arranged around the rotation center is formed between the inner arc surface and the outer wall of the handle; the second end is inserted into the arc-shaped guide groove, and the second end can be driven to slide on the extension path of the arc-shaped guide groove.

[0011] As an optional embodiment, a rotating protrusion radially protruding along the rotation center is provided on the outer wall of the handle; a strip groove is opened at the second end, and the inner wall of the end of the strip groove away from the moving contact rod has a hanging surface; when closing the switch, the handle rotates in the forward direction, driving the rotating protrusion to insert into the strip groove and abut against the hanging surface, forming a force that drives the quick-closing part away from the moving contact rod; when opening the switch, the handle rotates in the reverse direction, driving the rotating protrusion to separate from the hanging surface, and the quick-closing part moves in the direction close to the moving contact rod under the elastic thrust.

[0012] As an optional implementation, the blocking portion has a guide surface in contact with the retaining surface, and when the quick-engaging member moves away from or approaches the moving contact rod, the retaining surface and the guide surface slide.

[0013] As an optional implementation, the first elastic member connects the rotating base and the moving contact rod, and the rotating base is driven by the handle to rotate and squeeze the first elastic member to store energy.

[0014] As an optional embodiment, a torsion spring is sleeved on the rotation center of the handle, one end of the torsion spring is connected to the handle and is provided with an anti-detachment part, and the other end is connected to the shell; the torsion spring can generate a force to resist the handle; a torsion spring hole is also provided on the handle, and the torsion spring hole cooperates with the anti-detachment part.

[0015] On the other hand, an embodiment of the present application further provides a circuit breaker, comprising a housing, a moving contact assembly arranged in the housing, and the above-mentioned quick closing mechanism; the quick closing mechanism is connected to the moving contact assembly and can drive the moving contact assembly to close quickly.

[0016] The beneficial effects of the embodiments of the present application include:

[0017] The embodiment of the present application provides a quick-closing mechanism, which is arranged in linkage with the moving contact assembly of the circuit breaker, and the quick-closing mechanism includes a handle and a quick-closing part; the handle has a rotating center connected to the housing of the circuit breaker, and the handle can be driven to drive the moving contact assembly to open or close the circuit; the moving contact assembly includes a rotating base, a moving contact rod and a first elastic part connecting the rotating base and the moving contact rod; the first end of the quick-closing part extends toward the moving contact rod, and the second end extends toward the handle; during the closing action, the moving contact rod abuts against the first end of the quick-closing part to stop moving, and the rotating base is driven by the handle to rotate and squeeze the first elastic part to complete energy storage; a guide structure cooperating with the quick-closing part is provided on the housing, and under the guidance of the guide structure, the handle can be connected to the second end and drive the quick-closing part to move in a direction away from the moving contact rod, the first end releases the abutment on the moving contact rod, and the moving contact rod is pushed to close by the first elastic part. Compared with the prior art, the embodiment of the present application drives the quick-closing part to achieve linear movement through the handle, so that the quick-closing part quickly releases the abutment against the moving contact rod, allowing the moving contact rod to quickly release energy to close the circuit breaker. The quick-closing mechanism provided by the embodiment of the present application has a short action dimension chain, which is convenient for high-precision control of the closing circuit breaker and reduces the error of the opening distance of the moving contact.

[0018] The embodiment of the present application also provides a circuit breaker, including a housing, a moving contact assembly arranged in the housing, and the above-mentioned quick closing mechanism; the quick closing mechanism is connected to the moving contact assembly, and can drive the moving contact assembly to close quickly. The circuit breaker of the embodiment of the present application adopts the above-mentioned quick closing mechanism, which has the advantages of short action size chain and precise control, which is conducive to shortening the circuit breaker opening and closing action time and improving the reliability and stability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 paying creative work.

[0020] Figure 1 This is one of the structural schematic diagrams of the circuit breaker according to the embodiment of the present application;

[0021] Figure 2 This is the second structural schematic diagram of the circuit breaker according to the embodiment of the present application;

[0022] Figure 3 This is the third structural schematic diagram of the circuit breaker in the embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of the quick-close component of the embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the structure of the movable contact assembly opening in the embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of the structure of the energy storage of the moving contact assembly in the embodiment of the present application;

[0026] Figure 7 This is a structural schematic diagram of the closing of the moving contact assembly in an embodiment of the present application;

[0027] Figure 8 It is a schematic diagram of the structure of the torsion spring according to an embodiment of the present application.

[0028] icon:

[0029] 100-moving contact assembly; 101-handle; 102-quick-closing part; 103-housing; 104-rotation center; 105-rotation base; 106-moving contact rod; 107-torsion spring; 108-guide structure; 109-accommodation groove; 110-second elastic member; 111-hanging part; 112-holding surface; 113-guide surface; 114-support column; 115-stop part; 116-first abutting surface; 117-first supporting surface; 118-second abutting surface; 119-second supporting surface; 120-arc-shaped guide plate; 121-arc-shaped guide groove; 122-rotation protrusion; 123-strip groove; 124-hanging surface; 125-anti-slip part. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of 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.

[0034] In order to achieve fast closing, reduce the transition time of the switch when connecting the circuit, and improve the power supply reliability, it is necessary to set a fast closing mechanism in the circuit breaker. Usually, the fast closing mechanism uses a handle 101, a connecting rod and other structures to drive the moving contact assembly 100 and the static contact to achieve a fast closing operation. In order to release the elastic energy stored in the closing of the moving contact, a trigger release mechanism is usually set. In the closed state, the trigger release mechanism releases the lock of the moving contact, releases the elastic potential energy, and achieves fast closing.

[0035] In the prior art, the overall action dimension chain of the trigger release mechanism is relatively long, resulting in a large opening distance error of the moving contact, which makes it impossible to achieve precise control of the moving contact.

[0036] In order to solve the above technical problems, the embodiments of the present application provide a quick closing mechanism and a circuit breaker.

[0037] Reference Figure 1 , Figure 2 as well as Figure 3As shown, the embodiment of the present application provides a quick-closing mechanism, which is linked to the moving contact assembly 100 of the circuit breaker, and the quick-closing mechanism includes a handle 101 and a quick-closing member 102; the handle 101 has a rotation center 104 connected to the housing 103 of the circuit breaker, and the handle 101 can be driven to drive the moving contact assembly 100 to open or close the switch; the moving contact assembly 100 includes a rotating base 105, a moving contact rod 106, and a first elastic member connecting the rotating base 105 and the moving contact rod 106; the first end of the quick-closing member 102 extends toward the moving contact rod 106, and the first end of the quick-closing member 102 extends toward the moving contact rod 106. The two ends extend toward the handle 101; during the closing action, the moving contact rod 106 abuts against the first end of the quick-closing member 102 and stops moving, and the rotating base 105 is driven by the handle 101 to rotate and squeeze the first elastic member to complete energy storage; a guide structure 108 cooperating with the quick-closing member 102 is provided on the housing 103, and the handle 101 can be connected to the second end and drive the quick-closing member 102 to move in a direction away from the moving contact rod 106 under the guidance of the guide structure 108, and the first end releases the abutment on the moving contact rod 106, and the moving contact rod 106 is pushed to close by the first elastic member.

[0038] It should be noted that the moving contact assembly 100 of the embodiment of the present application is in contact with the static contact to achieve closing, and vice versa to achieve opening.

[0039] The handle 101 of the embodiment of the present application can rotate around the rotation center 104, and drive the rotating base 105 to rotate through the connecting rod. Since the rotating base 105 is provided with a first elastic member connected to the moving contact rod 106, before the moving contact rod 106 is blocked by the quick-close member 102, the moving contact rod 106 moves together with the rotating base 105. When the moving contact rod 106 is abutted by the quick-close member 102, the moving contact rod 106 cannot rotate. At this time, the rotating base 105 is driven by the handle 101 to rotate continuously, so that the first elastic member is compressed to achieve energy storage.

[0040] It should be noted that the elastic thrust generated by the first elastic member in energy storage is smaller than the resisting force that the quick-closing member 102 can provide to the moving contact rod 106. In other words, when the quick-closing member 102 moves away from the moving contact rod 106, the first elastic member can release elastic potential energy to make the moving contact rod 106 close quickly.

[0041] It should be noted that the quick-close member 102 of the embodiment of the present application moves in a translational motion mode approaching or moving away from the moving contact rod 106. The quick-close member 102 realizes the energy release triggering of the moving contact rod 106 through translation, which has the characteristics of simple structure and reliable movement, and the formed action dimension chain is short, so the error caused in the linkage process of each component will be reduced.

[0042] In the closing action of the embodiment of the present application, the moving contact rod 106 abuts against the first end of the quick-closing member 102 to stop moving, and the rotating base 105 is driven by the handle 101 to rotate and squeeze the first elastic member to complete energy storage; the housing 103 is provided with a guide structure 108 that cooperates with the quick-closing member 102. Under the guidance of the guide structure 108, the handle 101 can be connected with the second end and drive the quick-closing member 102 to move in a direction away from the moving contact rod 106, and the first end releases the abutment against the moving contact rod 106, and the moving contact rod 106 is pushed by the first elastic member to close the switch. Compared with the prior art, the embodiment of the present application drives the quick-closing member 102 to achieve translational movement through the handle 101, so that the quick-closing member 102 quickly releases the abutment against the moving contact rod 106, so that the moving contact rod 106 quickly releases energy to close the switch, and the quick-closing mechanism provided in the embodiment of the present application has a short action size chain, which is convenient for high-precision control of the closing and reduces the error of the moving contact opening distance.

[0043] Reference Figure 3 As shown, as an optional embodiment, the shell 103 has a receiving groove 109, and a second elastic member 110 is arranged in the receiving groove 109. The quick-connect member 102 is provided with a hanging portion 111 connected to the second elastic member 110. The quick-connect member 102 has a retaining surface 112 on the side away from the hanging portion 111, and the inner wall of the receiving groove 109 on the side close to the moving contact rod 106 has a guide surface 113. The thrust provided by the second elastic member 110 can make the retaining surface 112 of the quick-connect member 102 abut against the guide surface 113.

[0044] In the embodiment of the present application, the accommodating groove 109 not only forms a space for placing the second elastic member 110 , but also forms a blocking portion.

[0045] It should be noted that, in the embodiment of the present application, a receiving groove 109 is provided in the housing 103, and a second elastic member 110 is placed in the receiving groove 109, and its main function is to drive the quick-close member 102 to reset. Among them, the quick-close member 102 is driven by the handle 101 away from the moving contact rod 106, and at this time, the hanging part 111 will also compress the second elastic member 110, so that the second elastic member 110 stores energy, and reserves the elastic force that enables the quick-close member 102 to reset. When the handle 101 is separated from the quick-close member 102, the second elastic member 110 pushes the hanging part 111 on the quick-close member 102, so that the quick-close member 102 moves in the direction close to the moving contact rod 106, until the retaining surface 112 abuts against the receiving groove 109, and the quick-close member 102 stops moving, and reset is achieved.

[0046] It should be noted that the hanging portion 111 is located on one side or both sides of the extension direction of the fastener 102 .

[0047] Reference Figure 3 , Figure 4 as well as Figure 5As shown, as an optional embodiment, the guide structure 108 includes a support column 114 arranged near the moving contact rod 106; a stop portion 115 is arranged at the first end; the stop portion 115 is provided with a first abutting surface 116 on the side away from the moving contact rod 106, and the support column 114 has a first supporting surface 117; when the circuit breaker is closed and energy is stored, the first supporting surface 117 abuts against the first abutting surface 116, so that the stop portion 115 forms a force to prevent the moving contact rod 106 from closing.

[0048] It should be noted that, in the embodiment of the present application, a support column 114 is provided at a position close to the moving contact rod 106, and a first support surface 117 is provided on the support column 114. The first support surface 117 can be in abutment contact with the first abutment surface 116 of the stop portion 115, so that the quick-close component 102 can form a larger and more effective abutment force, thereby effectively blocking the moving contact rod 106 and ensuring that the first elastic component can store energy.

[0049] Reference Figure 5 , Figure 6 as well as Figure 7 As shown, as an optional embodiment, the stop portion 115 is an arc-shaped structure, the first abutting surface 116 is located on the inner side of the arc-shaped structure, and the outer side surface of the arc-shaped structure can abut against the moving contact rod 106; the end of the arc-shaped structure has a second abutting surface 118, and the support column 114 has a second supporting surface 119 on the side close to the arc-shaped structure, and a guide portion is formed at the connection between the first supporting surface 117 and the second supporting surface 119; when the quick-close member 102 moves away from the moving contact rod 106, the inner side surface of the arc-shaped structure and the guiding portion slide, so that the first supporting surface 117 is separated from the first abutting surface 116, and the second supporting surface 119 is overlapped with the second abutting surface 118.

[0050] It should be noted that the arc-shaped structure of the stopper 115 is a preferred embodiment, and those skilled in the art can configure it to other structures, such as an L-shaped structure, as required.

[0051] Reference Figure 5 , Figure 6 as well as Figure 7 As shown, further, the stopper 115 implemented in the present application is an arc-shaped structure, wherein the first abutting surface 116 is located on the inner side of the arc-shaped structure. It should be noted that the first abutting surface 116 can be set as an arc-shaped surface, and the first abutting surface 116 can slide with the support column 114. During the sliding process, the quick-closing member 102 can be guided by the inner arc surface of the arc-shaped structure to generate a certain degree of deviation in the process of moving away from the moving contact rod 106. The displacement realizes the misalignment of the stopper 115 and the support column 114, and finally achieves abutting contact, ensuring that the moving contact rod 106 can be smoothly closed.

[0052] It should be noted that when the fast-closing member 102 is pushed to reset by the second elastic member 110 , the inner side surface of the arc-shaped structure and the supporting column 114 can slide in the opposite direction, so that the first supporting surface 117 contacts the first abutting surface 116 .

[0053] Reference Figure 5 , Figure 6 as well as Figure 7 As shown, as an optional embodiment, the guide structure 108 includes an arc-shaped guide plate 120, the inner arc surface of the arc-shaped guide plate 120 is close to the handle 101, and an arc-shaped guide groove 121 arranged around the rotation center 104 is formed between the inner arc surface and the outer wall of the handle 101; the second end is inserted into the arc-shaped guide groove 121, and the second end can be driven to slide on the extension path of the arc-shaped guide groove 121.

[0054] The guide structure 108 of the embodiment of the present application further includes an arc-shaped guide plate 120, through which an arc-shaped guide groove 121 is formed on one side of the handle 101, and the arc-shaped guide groove 121 can constrain and guide the second end of the quick-close member 102. When the quick-close member 102 moves away from the moving contact rod 106 or approaches the moving contact rod 106, the second end slides on the path where the mutual guide grooves extend.

[0055] It should be noted that the arc-shaped guide groove 121 is arranged in cooperation with the arc-shaped structure of the stop portion 115, so that both ends of the quick-closing part 102 can achieve stable and reliable guiding limit in the sliding movement close to or away from the moving contact rod 106, thereby improving the stability and reliability of the movement of the quick-closing part 102.

[0056] Reference Figure 4 , Figure 5 , Figure 6 as well as Figure 7 As shown, as an optional embodiment, a rotating protrusion 122 radially protruding along the rotation center 104 is provided on the outer wall of the handle 101; a strip groove 123 is opened at the second end, and the inner wall of the end of the strip groove 123 away from the moving contact rod 106 has a hanging surface 124; when closing the switch, the handle 101 rotates forward, driving the rotating protrusion 122 to insert into the strip groove 123 and abut against the hanging surface 124, forming a force that drives the quick-closing part 102 away from the moving contact rod 106; when opening the switch, the handle 101 rotates reversely, driving the rotating protrusion 122 to separate from the hanging surface 124, and the quick-closing part 102 moves in the direction close to the moving contact rod 106 under the elastic thrust.

[0057] In the embodiment of the present application, a rotating protrusion 122 is provided on the outer wall of the handle 101 and near the arc-shaped guide groove 121; the strip groove 123 is arranged on the movement path of the rotating protrusion 122, and when the rotating protrusion 122 rotates, it can be inserted into the strip groove 123. When closing the switch, the handle 101 rotates forward, driving the rotating protrusion 122 to insert into the strip groove 123 and abut against the hanging surface 124, forming a force that drives the quick-closing part 102 away from the moving contact rod 106; when opening the switch, the handle 101 rotates reversely, driving the rotating protrusion 122 to separate from the hanging surface 124, and the quick-closing part 102 moves in the direction close to the moving contact rod 106 under the elastic thrust.

[0058] Reference Figure 3 As shown, as an optional implementation, the guide surface 113 is an arc surface, and when the quick-close member 102 moves away from or approaches the moving contact rod 106, the retaining surface 112 and the guide surface 113 slide.

[0059] Preferably, the arc surface of the guide surface 113 in the embodiment of the present application can be consistent with the arc of the arc structure of the stop portion 115.

[0060] Reference Figure 8 As shown, as an optional embodiment, a torsion spring 107 is sleeved on the rotation center 104 of the handle 101, one end of the torsion spring 107 is connected to the handle 101 and is provided with an anti-detachment portion 125, and the other end is connected to the shell 103; the torsion spring 107 can generate a force to resist the handle 101; a torsion spring hole is also provided on the handle 101, and the torsion spring hole cooperates with the anti-detachment portion 125.

[0061] It should be noted that the anti-slip portion 125 is hooked with the hole of the torsion spring 107 so that the torsion spring 107 is reliably fixed to prevent the torsion spring 107 from loosening during rotation.

[0062] On the other hand, an embodiment of the present application further provides a circuit breaker, including a housing 103 and a moving contact assembly 100 and the above-mentioned quick closing mechanism arranged in the housing 103; the quick closing mechanism is connected to the moving contact assembly 100 and can drive the moving contact assembly 100 to close quickly.

[0063] The circuit breaker of the embodiment of the present application adopts the above-mentioned quick closing mechanism, which has the advantages of short action size chain and precise control, which is beneficial to shortening the circuit breaker opening and closing action time and improving the reliability and stability of power supply.

[0064] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A quick closing mechanism, arranged in linkage with a moving contact assembly (100) of a circuit breaker, characterized in that: The quick-closing mechanism comprises a handle (101) and a quick-closing member (102); the handle (101) has a rotation center (104) connected to a housing (103) of a circuit breaker, and the handle (101) is driven to drive a moving contact assembly (100) to open or close the circuit breaker; the moving contact assembly (100) comprises a rotating base (105), a moving contact rod (106) and a first elastic member; a first end of the quick-closing member (102) extends toward the moving contact rod (106), and a second end extends toward the handle (101); a closing action In the embodiment, the moving contact rod (106) abuts against the first end of the quick-closing part (102) to stop moving, and the first elastic part can store energy; the housing (103) is provided with a guide structure (108) that cooperates with the quick-closing part (102), the handle (101) can be connected to the second end and drive the quick-closing part (102) to move in a direction away from the moving contact rod (106) under the guidance of the guide structure (108), the first end releases the abutment on the moving contact rod (106), and the moving contact rod (106) is pushed to close by the first elastic part.

2. The quick-closing mechanism according to claim 1, characterized in that: The shell (103) is provided with a second elastic member (110); the quick-close member (102) is provided with a hanging portion (111) connected to the second elastic member (110); the quick-close member (102) has a retaining surface (112) on a side away from the hanging portion (111); the shell (103) has a blocking portion; the thrust provided by the second elastic member (110) can cause the retaining surface (112) of the quick-close member (102) to abut against the blocking portion; the hanging portion (111) is located on one side or both sides of the extension direction of the quick-close member (102).

3. The quick-closing mechanism according to claim 1, characterized in that: The guide structure (108) comprises a support column (114) arranged close to the moving contact rod (106); a stop portion (115) is arranged at the first end; the stop portion (115) is provided with a first abutting surface (116) on the side facing away from the moving contact rod (106), and the support column (114) has a first supporting surface (117); when closing the switch to store energy, the first supporting surface (117) abuts against the first abutting surface (116), so that the stop portion (115) forms a force to prevent the moving contact rod (106) from closing the switch.

4. The quick-closing mechanism according to claim 3, characterized in that: The first abutting surface (116) is located on one side of the stop portion (115), and the other side surface corresponding to the stop portion (115) can abut against the moving contact rod (106); the end of the stop portion (115) has a second abutting surface (118), and the support column (114) has a second supporting surface (119) on the side close to the stop portion (115), and a guide portion is formed at the connection between the first supporting surface (117) and the second supporting surface (119); when the quick-close component (102) moves away from the moving contact rod (106), the stop portion (115) and the guiding portion slide, so that the first supporting surface (117) is separated from the first abutting surface (116), and the second supporting surface (119) is overlapped with the second abutting surface (118).

5. The quick-closing mechanism according to claim 1, characterized in that: The guide structure (108) comprises an arc-shaped guide plate (120), the inner arc surface of the arc-shaped guide plate (120) is close to the handle (101), and an arc-shaped guide groove (121) arranged around the rotation center (104) is formed between the inner arc surface and the outer wall of the handle (101); the second end is inserted into the arc-shaped guide groove (121), and the second end is driven to slide on the extension path of the arc-shaped guide groove (121).

6. The quick-closing mechanism according to claim 5, characterized in that: The outer wall of the handle (101) is provided with a rotating protrusion (122) radially protruding along the rotation center (104); the second end is provided with a strip groove (123), and the inner wall of the end of the strip groove (123) away from the moving contact rod (106) has a hanging surface (124); when the switch is closed, the handle (101) rotates in the positive direction, driving the rotating protrusion (122) to insert into the strip groove (123) and abut against the hanging surface (124), thereby forming a force that drives the quick-closing part (102) away from the moving contact rod (106); when the switch is opened, the handle (101) rotates in the reverse direction, driving the rotating protrusion (122) to separate from the hanging surface (124), and the quick-closing part (102) moves in a direction close to the moving contact rod (106) under the elastic thrust.

7. The quick-closing mechanism according to claim 2, characterized in that: The blocking portion has a guide surface (113) in contact with a retaining surface (112); when the quick-close component (102) moves away from or approaches a moving contact rod (106), the retaining surface (112) and the guide surface (113) slide.

8. The quick-closing mechanism according to claim 1, characterized in that: The first elastic member connects the rotating base (105) and the moving contact rod (106); the rotating base (105) is driven by the handle (101) to rotate and squeeze the first elastic member to store energy.

9. The quick-closing mechanism according to claim 1, characterized in that: A torsion spring (107) is sleeved on the rotation center (104) of the handle (101); one end of the torsion spring (107) is connected to the handle (101) and is provided with an anti-slip portion (125), and the other end is connected to the housing (103); the torsion spring (107) can generate a force to resist the handle (101); a torsion spring hole is also provided on the handle (101), and the torsion spring hole cooperates with the anti-slip portion (125).

10. A circuit breaker, characterized in that: It comprises a housing (103), a moving contact assembly (100) arranged in the housing (103), and a quick closing mechanism as described in any one of claims 1 to 9; the quick closing mechanism is connected to the moving contact assembly (100) and can drive the moving contact assembly (100) to close quickly.

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